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Sustainable Tropical Architecture and Building Energy Regulations

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21 August 2024

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24 August 2024

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Abstract
Tropical regions face significant energy challenges due to climatic conditions. This study investigates the interplay between sustainable architecture and building energy regulations in mitigating these challenges. The study aims to assess the effectiveness of existing building energy regulations in promoting sustainable architecture in tropical climates and identify key architectural strategies and regulatory frameworks for optimizing energy efficiency in tropical buildings. A comparative analysis of building regulations and case studies of sustainable buildings in selected tropical regions is conducted. The findings reveal that current regulations often must be revised to address tropical climates' unique energy demands. Incorporating passive design principles, renewable energy systems, and material selection is crucial for energy efficiency. It is recommended that building energy regulations be strengthened to mandate sustainable design strategies and provide incentives to promote the adoption of energy-efficient technologies.
Keywords: 
Subject: Engineering  -   Architecture, Building and Construction

1. Introduction

Tropical regions, characterized by high temperatures, humidity, and solar radiation, present unique challenges for building energy consumption. The escalating energy crisis and environmental concerns necessitate a shift towards sustainable architecture and building practices. This research investigates the intricate relationship between sustainable architecture and building energy regulations in tropical climates.
The overarching aim of this study is to contribute to developing effective building energy regulations that promote sustainable architecture in tropical regions. To achieve this, the research seeks to:
i.
Carry out a comprehensive study of existing building energy standards in selected tropical countries.
ii.
Identify sustainable architecture's key performance indicators (KPIs) in tropical contexts.
iii.
Assess the correlation between energy consumption and architectural design elements in tropical buildings.
iv.
Evaluate the effectiveness of current building energy regulations in promoting energy efficiency in tropical regions.
Sustainable construction is underpinned by three core pillars: environmental, social, and economic sustainability (CIOB Academy, n.d.). Environmental sustainability minimizes the building's ecological footprint through resource efficiency, energy conservation, and material selection (Oyedele, 2021). Social sustainability centers around creating built environments that positively influence occupants' physical and mental health, as well as their comfort levels. Economic sustainability ensures the building's long-term viability through cost-effective design, operation, and maintenance (Goh et al., 2023).
Sustainable architecture prioritizes passive design elements like optimal building orientation, shading, ventilation, and natural light to maximize energy efficiency. Moreover, incorporating renewable technologies like solar power into building systems is essential to minimize dependence on fossil fuels. (Architecturesstyle, n.d.). Material selection, emphasizing locally sourced and recycled materials, contributes to environmental and economic sustainability (HMC Architects, 2018). By understanding the relationship between sustainable architecture and building energy regulations, this research aims to inform policymakers and practitioners in developing effective strategies to mitigate energy consumption and promote sustainable environments in tropical regions.

2. Literature Review

2.1. Historical Development and Evolution of Sustainable Construction Practices

"The buildings we create today shape the world we live in tomorrow" (Berge, 2009). This powerful statement captures the essence of sustainable construction, a concept that has evolved significantly throughout history. While the formalization of sustainable construction practices is relatively recent, the seeds of environmental consciousness in building can be traced back centuries.
Before the Industrial Revolution, construction practices were primarily driven by necessity and a deep connection to the natural environment. Local, readily available materials were used, focusing on durability and energy efficiency. Vernacular architecture, the traditional building styles of a particular region, exemplifies this approach. These styles, like the American Southwest's adobe homes or Iceland's turf-roofed houses, were meticulously adapted to local climates and resources (Dix, 2003). The Industrial Revolution ushered in a shift towards mass production and standardized building materials, often with environmental consequences. However, resource depletion and pollution concerns emerged in the late 19th and early 20th centuries. The writings of Rachel Carson, particularly her seminal work "Silent Spring" (1962), are credited with raising public awareness about the negative environmental impacts of industrial activity, including construction (McKibben, 2004).
The latter half of the 20th century saw a growing focus on sustainability in architecture and construction. The energy crisis of the 1970s spurred the development of energy-efficient building practices and technologies (Brenda & Rosenfeld, 2017). The introduction of green building rating systems, such as LEED (Leadership in Energy and Environmental Design), in 1993 provided a blueprint for architects, engineers, and builders to create more environmentally friendly buildings. (US Green Building Council, n.d.) (Takada et al., 2020). Sustainable construction today involves a holistic approach that considers the entire lifespan of a building, from its inception to its eventual demolition. This encompasses factors such as site selection, material sourcing, energy efficiency, water conservation, and the ability to deconstruct the building responsibly at the end of its useful life (International Institute for Sustainable Development [IISD], n.d.). There is a growing emphasis on sustainability's social and economic dimensions, ensuring construction projects promote health and well-being while maintaining financial viability (World Green Building Council., 2019).
The evolution of sustainable construction practices is an ongoing journey. As technological advancements emerge and environmental challenges intensify, the building industry continues to adapt and innovate, building a more sustainable future for future generations.

2.2. Challenges in Sustainable Construction

Despite its environmental benefits, sustainable construction has yet to gain widespread acceptance due to several obstacles. One primary challenge is the substantial upfront costs associated with incorporating eco-friendly technologies and materials into building projects (Fernández-Solís et al., 2018). The upfront investment required for sustainable features often deters developers and clients, particularly in regions with limited financial incentives for sustainable construction. Another critical challenge is the complexity of navigating diverse sustainability standards and certification systems (Lehmann & Woiwode, 2016). Different countries and regions have varying sustainability regulations and guidelines, creating confusion for stakeholders and hindering the harmonization of sustainable practices on a global scale.
Additionally, the need for a more skilled workforce and awareness of sustainable construction practices presents a challenge (Agdas & Yaman, 2019). Establishing capacity building and training programs to impart the necessary knowledge and skills to professionals to implement sustainable design and construction techniques effectively is imperative.
Notwithstanding these challenges, the construction industry is witnessing a surge in sustainable practices. Advances in technology and design are paving the way for more environmentally responsible and resilient buildings. One notable trend is the construction adoption of circular economy principles (Yang et al., 2020). This involves promoting resource efficiency through recycling and reusing construction materials, reducing waste generation, and implementing sustainable demolition and refurbishment strategies. Another future trend is the rise of intelligent and green technologies integrated into buildings (Xu et al., 2019). This includes using Building Information Modeling (BIM) to optimize design and construction processes and integrate renewable energy systems and intelligent building technologies to enhance energy efficiency and occupant comfort.
Furthermore, regenerative design is gaining traction as a future trend in sustainable construction (Hopfe et al., 2021). Regenerative design goes beyond minimizing negative impacts to actively restoring and enhancing natural ecosystems through building interventions, fostering a symbiotic relationship between built environments and nature.
In summary, while challenges persist in adopting sustainable construction practices, promising future trends such as circular economy principles, intelligent technologies, and regenerative design offer opportunities to advance the sustainability agenda in the construction industry.
Methods of Sustainable Construction
Below are some of the methods of sustainable construction that are making a positive impact.
i.
Solar Power:
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Using the sun's energy is a big part of green building technology.
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Active solar energy uses solar panels to turn sunlight into electricity. This makes sustainable construction more affordable.
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Passive solar energy uses the sun to warm buildings by placing windows in specific ways to let sunlight in.
ii.
Biodegradable Materials:
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Using materials that can break down naturally helps reduce waste.
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Materials like bamboo, wood, straw bales, recycled wood, cork, hempcrete, and plant-based paints are good choices as they break down without harming the environment.
iii.
Green Insulation:
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Insulation keeps buildings warm or cool, saving energy.
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Green building practices often involve incorporating recycled materials, such as old denim or paper, into insulation systems.
iv.
Cool Roofs
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Roofs that reflect sunlight keep buildings cooler.
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This means less need for air conditioning, saving energy and reducing greenhouse gases.
v.
Sustainable Resource Sourcing:
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Choosing materials that are recycled or come from eco-friendly sources is critical.
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This method promotes the use of environmentally friendly materials.
vi.
Water Efficiency Technologies:
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Saving water is a big part of sustainable construction.
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Technologies like rainwater harvesting, greywater reuse, and efficient fixtures help manage water wisely.
vii.
Sustainable Indoor Environment Technologies:
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A healthy indoor environment is indispensable for well-being.
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Selecting materials free from harmful chemicals and effectively managing moisture levels contribute to a cleaner and healthier indoor environment.
viii.
Passive House:
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A passive house design uses the building's design to manage temperature without much energy.
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This green building concept significantly decreases energy usage for heating and cooling, by as much as 90%.

Benefits of Sustainable Construction

The following are some of the benefits of sustainable construction:
i.
Enhanced Environmental Protection:
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Sustainable construction helps reduce pollution and waste.
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It uses resources like water and energy more wisely and suits nature.
ii.
Improved Social and Economic Conditions:
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This way of building can create jobs and training opportunities.
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It supports the economy and helps people in the community.
iii.
Increased Resilience:
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Buildings made with green building technology are more robust against climate change and other environmental threats.
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They can stand up better to extreme weather, keeping people safe.
iv.
Improves Occupant Health and Well-being:
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Sustainable buildings offer improved air quality and increased natural light.
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This can make people feel better and healthier while inside.
v.
Improved Construction Technology:
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Using green building methods can lead to better building technology.
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Enhances the construction process by increasing productivity and reducing its ecological footprint.
vi.
Enhanced Building Performance:
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Buildings made using the green building concept use less energy and water.
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They also create less pollution, making them better for the environment.

2.3. Barriers to Implementing Sustainable Design: Paving the Way for a Greener Future

Sustainable design aims to reduce the environmental footprint of buildings from inception to demolition (Asif et al., 2013). While the benefits are undeniable, widespread adoption faces several significant hurdles. Here, we explore key barriers hindering the implementation of sustainable design and explore potential solutions.
i.
Economic Considerations
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Higher Initial Costs: Sustainable materials and technologies often have a steeper price than conventional options (World Business Council for Sustainable Development (WBCSD), 2023). This can be a significant deterrent for companies and individuals with limited budgets, particularly in the short term.
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Lack of Long-Term Cost-Benefit Analysis: The cost savings associated with sustainable design, such as reduced energy consumption and maintenance needs, can be intangible or accrue over a more extended period. Decision-makers may prioritize lower upfront costs, overlooking the long-term economic benefits (Asif M. et al., 2013).
ii.
Knowledge and Awareness
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Limited Knowledge Among Stakeholders: A significant barrier exists in the knowledge gap between designers, manufacturers, and consumers regarding sustainable options and practices (Asif et al., 2013). This can lead to a lack of understanding of the benefits and challenges associated with sustainable design.
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Consumer Skepticism: Consumers may be skeptical of the actual environmental benefits of sustainable products or perceive them as inferior in quality (Charter & Chick, 2009). This can hinder market demand for sustainable design solutions.
iii.
Design and Implementation Challenges
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The complexity of Integration: Integrating sustainable elements into a product or building design can complicate the process (Gaterell et al., 2020). This requires collaboration among diverse stakeholders, potentially extending project timelines and requiring specialized expertise.
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Lack of Standardized Metrics: The absence of standardized metrics for measuring the environmental performance of products and designs creates ambiguity and can make it difficult to accurately assess the sustainability of different options (Brent & Turner, 2012).
iv.
Policy and Market Factors
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Inconsistency in Regulations: A lack of clear and consistent regulations regarding sustainable design practices across different regions can create confusion and impede market growth (International Institute for Sustainable Development [IISD], n.d.).
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Limited Availability of Sustainable Materials: The availability of sustainable materials and technologies may be limited in specific markets, hindering the ability of designers and manufacturers to implement sustainable design principles (World Business Council for Sustainable Development (WBCSD), 2023).

2.4. Strategies for Sustainable Design in Tropical Regions

Tropical regions face unique challenges in implementing sustainable design practices. While the potential benefits are significant, climate, economic constraints, and a lack of awareness can hinder progress. Fortunately, several strategies can be employed to overcome these barriers and create a more sustainable built environment in the tropics.
i.
Addressing Cost Concerns
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Life Cycle Cost Analysis: Life cycle cost analysis can reveal the hidden economic advantages of sustainable design. While upfront costs for sustainable materials may be greater, substantial savings on energy consumption and maintenance can be realized over the building's lifespan. (Asif et al., 2013).
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Financial Incentives: Financial incentives such as tax reductions, subsidies, and low-interest loans can be offered by governments and institutions to encourage sustainable design in projects (Dodge Data & Analytics, 2020).
ii.
Building Knowledge and Capacity
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Education and Training Programs: Investing in educational programs for architects, engineers, construction workers, and developers on sustainable design principles and practices specific to tropical contexts can bridge the knowledge gap (Asif et al., 2013).
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Knowledge-Sharing Platforms: Establishing online platforms or local resource centers can facilitate disseminating best practices, case studies, and technical information on sustainable design in tropical regions.
iii.
Optimizing Design for the Tropics
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Passive Design Strategies: Implementing passive cooling strategies such as natural ventilation, shading, and proper building positioning can substantially lower energy use for air conditioning in hot, humid regions (Singh et al., 2014).
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Locally Sourced and Bio-Based Materials: Specifying locally available, low-carbon materials like bamboo, recycled materials, and earth construction techniques can minimize environmental impact and reduce transportation costs (Frascaria, Apostol, Rosa, & Stanciu, 2021).
iv.
Collaboration and Policy
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Stakeholder Engagement: Encouraging collaboration between architects, engineers, policymakers, and local communities throughout the design and construction process can ensure that sustainable solutions are culturally appropriate, economically viable, and meet the community's needs (World Green Building Council., 2019).
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Developing Contextual Green Building Rating Systems: Adapting existing green building rating systems to account for tropical regions' specific challenges and opportunities can provide a clear framework for sustainable construction practices (International Institute for Sustainable Development [IISD], n.d.).
By implementing these strategies, stakeholders in the construction industry can overcome the barriers to sustainable design in tropical regions. By focusing on lifecycle cost analysis, knowledge sharing, bio-based materials, and collaborative design processes, a more sustainable future can be built for tropical communities.

2.5. The Role of Architects and Collaborative Approaches in Sustainable Design

Architects play a pivotal role in shaping the built environment and are responsible for promoting sustainable design practices. However, the complexities of sustainable construction necessitate a collaborative approach that brings together various disciplines and stakeholders (ProEst, 2023).
i.
The Architect as Sustainability Champion
Architects act as sustainability champions by:
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Integrating Sustainable Principles into Design: Architects are responsible for translating sustainable principles into building designs. This involves strategic site selection, incorporating energy-efficient features, choosing sustainable materials, and implementing water-saving measures (International Institute for Sustainable Development [IISD], n.d.).
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Guiding Clients and Stakeholders: Architects can educate clients and other stakeholders about the benefits of sustainable design and help them make informed decisions that prioritize environmental and social well-being (World Green Building Council., 2019).
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Innovation and Optimization: Architects can use their creativity and technical expertise to develop innovative solutions and optimize building performance for sustainability throughout its lifecycle (Asif et al., 2013).
ii.
The Power of Collaboration
Sustainable design goes beyond the expertise of any single discipline. Collaboration between architects and other stakeholders is crucial for success. Here is how collaboration benefits sustainable construction:
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Enhanced Design Integration: Collaboration fosters a holistic approach, ensuring that all aspects of a building, from structure and materials to energy systems and landscaping, work together to achieve optimal sustainability outcomes (Brennan, 2023).
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Expertise Sharing: Involving architects, engineers, landscape architects, sustainability consultants, and other specialists allows each party to contribute their unique knowledge and expertise, leading to more comprehensive and effective solutions (Chitkara University, 2023).
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Addressing Challenges: Collaboration facilitates the identification and mitigation of potential challenges related to sustainability. Different perspectives can help address issues like lifecycle costs, material sourcing, and regulatory compliance (Asif et al., 2013).
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Building Consensus and Buy-In: Collaborative processes allow for open communication and shared decision-making among stakeholders, leading to greater ownership and buy-in for the project's sustainability goals (World Green Building Council., 2019).
iii.
Examples of Collaborative Approaches
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Integrated Project Delivery (IPD): IPD is a collaborative project delivery method that brings together all key stakeholders from the project's inception to foster open communication and early problem-solving (AIA Contract Documents, n.d.).
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LEED Certification Process: The LEED (Leadership in Energy and Environmental Design) green building rating system encourages collaboration by requiring project teams to demonstrate their commitment to sustainability throughout the design, construction, and operation phases (US Green Building Council, n.d.).
Architects play a critical role in the pursuit of sustainable design. By integrating sustainability principles into their work and fostering collaborative design processes, architects can lead toward a future with more environmentally responsible and resilient buildings.

2.6. Building Energy Regulations

In the face of escalating concerns about climate change and energy sustainability, building energy regulations has become a pivotal tool for curbing energy consumption and reducing greenhouse gas emissions. These regulations, encompassing diverse standards, codes, and policies, significantly influence building design, construction, and operation. By establishing minimum energy performance requirements and promoting the adoption of energy-efficient technologies, building energy regulations play a crucial role in shaping the environmental impact of the built environment (Smith, 2022).
Building energy regulations are rooted in a historical trajectory of evolving energy policies and international agreements to promote energy efficiency. For instance, the Kyoto Protocol and subsequent climate accords have emphasized the urgency of mitigating the environmental impact of energy use in buildings, which account for a substantial share of global energy demand and emissions (International Energy Agency [IEA], 2023).
i.
Overview of the importance of energy efficiency in buildings.
Energy efficiency has evolved from a specialized focus to a cornerstone of sustainable building practices. Given the substantial energy consumption and greenhouse gas emissions attributed to buildings, enhancing their energy performance is imperative for a greener and more sustainable future (International Energy Agency [IEA], 2023). Energy-efficient building practices offer a triple bottom line benefit by improving environmental sustainability, economic performance, and human well-being.
Energy-efficient buildings contribute to a lower carbon footprint by dramatically cutting energy consumption, which in turn minimizes greenhouse gas emissions from electricity production and fossil fuel burning (International Energy Agency [IEA], 2023). This helps mitigate climate change and its associated environmental consequences. Reduced energy consumption translates to a lower demand for fossil fuels, promoting resource conservation and reducing dependence on non-renewable energy sources (Ülkü et al., 2017).
Energy-efficient buildings offer substantial savings on utility bills by decreasing energy consumption. This can improve the financial viability of buildings and increase their market value (US Energy Information Administration [EIA], 2023). Energy-efficient features, like high-performance insulation and efficient appliances, save energy and improve overall building performance, leading to a more comfortable and healthier indoor environment (Fisk, 2000).
By incorporating advanced ventilation and filtration, energy-efficient structures can significantly enhance indoor air quality and occupant well-being (Fisk, 2000). By incorporating proper insulation and passive design elements into building exteriors, it's possible to create more thermally comfortable indoor spaces, reduce dependence on HVAC systems, and improve overall occupant health and satisfaction (Fisk, 2000).
ii.
Demystifying the Terminology: Exploring Definitions of Building Energy Regulations
Building energy regulations, often referred to by various terms, are critical in promoting energy efficiency within the built environment. Understanding these different definitions is essential for navigating the landscape of energy standards for buildings. Here is a breakdown of some key terms:
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Building Energy Regulations (BER): This is a general term encompassing all mandatory regulations that establish minimum energy performance requirements for buildings (International Energy Agency [IEA], 2023). It refers to the overarching framework that sets the baseline for energy efficiency in the construction and operation of buildings.
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Energy Performance Standards (EPS): These are specific benchmarks outlined within building energy regulations that define the minimum acceptable level of energy efficiency for a building. EPS typically addresses aspects like maximum energy consumption per unit floor area or specific requirements for building envelope performance (European Commission, 2023).
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Building Codes: Building codes provide a comprehensive set of rules that govern the design and construction of buildings, covering essential areas like structural stability, fire prevention, and accessibility. While some building codes may integrate energy performance standards, they are not solely focused on energy efficiency (Dodge Data & Analytics, 2020).
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Green Building Rating Systems (GBRS): These voluntary programs offer a structured approach to measure and recognize a building's environmental performance in areas such as energy efficiency, water conservation, and sustainable material use (World Green Building Council., 2019). While not regulations, GBRS can be used as a benchmark for exceeding minimum energy performance standards mandated by building energy regulations.
iii.
Additional Considerations
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Regional Variations: Definitions and specific requirements of building energy regulations can vary significantly between countries and regions. Understanding local regulations is crucial for ensuring compliance (International Energy Agency [IEA], 2023).
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Evolution of Terminology: As building energy efficiency continues to evolve, the terminology used in regulations may also change. Staying informed about current language and interpretations is important (European Commission, 2023).
iv.
Examples
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International Energy Conservation Code (IECC) in the US: The IECC is an example of building energy regulations that establish minimum EPS for commercial and residential buildings across the United States (US Department of Energy [DOE], n.d.).
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Leadership in Energy and Environmental Design (LEED): LEED is a prominent example of a GBRS that goes beyond minimum energy performance standards, offering a pathway for high-performance and sustainable buildings (World Green Building Council., 2019).

3. Methodology

This research adopts a systematic review approach to thoroughly investigate the interplay between sustainable architecture and building energy regulations in tropical regions. We embarked on a comprehensive exploration of academic databases, including Scopus, Web of Science, PubMed, and Google Scholar, utilizing pertinent keywords such as "sustainable architecture," "tropical climate," "building energy regulations," "energy efficiency," and "case studies."
To ensure the relevance of included studies, we will meticulously develop and apply precise inclusion and exclusion criteria. These criteria were anchored on geographical location, study design, publication date, and data availability. Once the relevant studies are identified, we systematically extract crucial data, such as study characteristics, methodology, key findings, and conclusions. This information was meticulously organized within a standardized data extraction form.
To guarantee the credibility of the included studies, we rigorously assess their quality using established appraisal tools like the Critical Appraisal Skills Programme (CASP) tools. Subsequently, we synthesize the extracted data to uncover patterns, trends, and knowledge gaps. This process may involve meta-analysis, if appropriate, or a narrative synthesis.
We conducted a comparative analysis of building energy regulations across diverse tropical regions to understand the regulatory landscape better. This analysis illuminates’ commonalities, disparities, and exemplary practices. Furthermore, we investigated published case studies of sustainable buildings in tropical climates to examine their design features, energy performance, and valuable lessons.
To enrich our investigation, we explore additional sources of information, including government reports, industry publications, and conference proceedings. To bolster the credibility of our findings, we cross-validated information from various studies. A robust theoretical framework underpinned our review, providing a structured data analysis and interpretation approach. We optimize resources and time while achieving our research objectives by concentrating on a systematic review. This approach guarantees a comprehensive exploration of existing knowledge, enhancing the credibility and generalizability of our findings.

4. Findings

4.1. Challenges and Solutions to Architecture in Tropical Regions

As stated earlier, tropical regions present unique challenges for architects. While these areas boast abundant natural beauty and sunshine, designing comfortable and sustainable buildings requires careful consideration of several climatic factors. Stated below are some of the critical challenges architects face when designing for the tropics:
Heat and Humidity: The relentless heat and high humidity levels in tropical regions can create discomfort for occupants if not addressed strategically in building design (Attia et al., 2017). Balancing ventilation and natural light with minimizing heat gain is crucial.
i.
Solar Radiation: Tropical regions experience intense solar radiation throughout the year. This can lead to excessive heat gain within buildings and contribute to glare issues (Wong & Feria-Velasco, 2013). Shading strategies and proper window placement are essential to control solar heat gain.
ii.
Heavy Rainfall and Flooding: Many tropical regions experience periods of heavy rainfall and potential flooding. Buildings must be designed to withstand these conditions, with proper waterproofing, drainage systems, and potentially considering flood-resilient foundations (Koksal & Duru, 2018).
iii.
Natural Disasters: Tropical regions are more prone to natural disasters like hurricanes, typhoons, and cyclones. Buildings must be structurally sound and incorporate features to resist high winds and potential seismic activity (Hao et al., 2017).
iv.
Material Selection: Choosing appropriate building materials is critical in tropical climates. Materials should be resistant to heat, humidity, and potentially mold growth. Additionally, it is essential to consider the environmental impact of materials and prioritize sustainable options (Aso & Hien, 2006).
Despite these challenges, architects have developed a range of strategies to create comfortable, functional, and sustainable buildings in tropical regions. Some of these key approaches are:
i.
Passive Design Principles: Utilizing passive cooling techniques like natural ventilation, cross-flow design, shading elements, and efficient building envelopes can significantly reduce reliance on energy-intensive mechanical cooling systems (Attia et al., 2017).
ii.
Bioclimatic Design: Bioclimatic design takes advantage of local climatic conditions to create comfortable indoor environments. This might involve using local vegetation for shading and cooling, incorporating water features for evaporative cooling, and maximizing natural daylighting (Wong & Feria-Velasco, 2013).
iii.
Building Orientation and Landscaping: Proper orientation and strategic landscaping can significantly impact a building's thermal performance. Shading facades most exposed to direct sunlight and utilizing vegetation for shading and wind channeling are effective strategies (Koksal & Duru, 2018).
iv.
Resilient Building Practices: Incorporating features like storm shutters, flood barriers, and structurally sound construction methods can improve a building's resilience to natural disasters (Hao et al., 2017).
v.
Sustainable Material Selection: Utilizing locally sourced, low-embodied carbon materials and prioritizing natural ventilation over-reliance on air conditioning can minimize the environmental impact of buildings in tropical regions (Aso & Hien, 2006).
By thoughtfully considering these challenges and adopting appropriate design strategies, architects can create comfortable, functional, and environmentally responsible buildings, ensuring a sustainable future for tropical built environments.

4.2. Sustainable Architecture Design Strategies in the Tropics

The tropics present unique challenges and opportunities for architects designing sustainable buildings. The hot, humid climate, abundant sunshine, and distinct rainy seasons necessitate design approaches prioritizing occupant comfort, energy efficiency, and environmental responsibility (Wong & Kenney, Tropical Urban Design: A Handbook for Creating Healthy and Resilient Cities., 2017). Fortunately, many design strategies can be employed to create sustainable and comfortable buildings within tropical contexts.
Sustainable architecture is a multidimensional concept that includes environmental, social, and economic considerations throughout a building's lifecycle (Asif et al., 2013). However, pinpointing a single, universally accepted definition still needs to be discovered. Here, we look into various perspectives on what constitutes sustainable architecture:
i.
Environmentally-Focused Definitions: These definitions emphasize minimizing a building's environmental impact. The American Institute of Architects (AIA) defines sustainable design as "the practice of design, construction, use, operation, and reuse including deconstruction or repurposing of the built environment in a way that optimizes the positive environmental, economic and societal impacts while minimizing negative environmental impact throughout the building's life cycle" (AIA, 2021). Similarly, the World Green Building Council (WGBC) emphasizes "designing, constructing and operating buildings in a way that minimizes their environmental impact" (WGBC, 2020).
ii.
Holistic Definitions: These definitions recognize the relationships between sustainability's environmental, social, and economic aspects. The International Institute for Sustainable Development (IISD) defines sustainable architecture as a holistic approach that prioritizes environmental responsibility, human well-being, and economic efficiency throughout a building's lifespan. This includes designing, constructing, and operating buildings to minimize their ecological footprint while maximizing occupant health and economic viability (International Institute for Sustainable Development [IISD], n.d.)
iii.
Performance-Based Definitions: These definitions shift the focus from specific materials or technologies to a building's overall performance in achieving sustainability goals. For instance, the European Commission defines a sustainable building as "a building that has a minimal impact on the environment, and in which the health and well-being of the occupants are promoted, while also being economically viable throughout its life cycle" (European Commission, n.d.).
The various definitions highlight the complexity of sustainable architecture. While minimizing environmental impact remains a core principle, considerations for social equity, occupant health, and economic viability are increasingly emphasized. This holistic approach ensures that buildings function well for the environment and contribute positively to the lives of those who use them.

4.3. Rising to the Challenge: Emerging Technologies for Tropical Architecture

Tropical architecture faces a unique challenge: creating comfortable and sustainable living spaces in hot, humid, and often resource-constrained environments. Fortunately, emerging technologies offer exciting possibilities to address these challenges and push the boundaries of sustainable design in the tropics.
i.
Biomimicry and Natural Materials
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Biomimetic Design: Drawing inspiration from nature, architects are exploring biomimicry principles to develop innovative cooling solutions. For example, building envelopes inspired by the self-regulating temperature of termite mounds or ventilation systems mimicking fish's gill structures offer promising possibilities (Frascaria et al., 2021).
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Advanced Timber Technologies: Advancements in timber modification and treatment enable the broader use of sustainably harvested wood in tropical construction. These technologies enhance durability and fire resistance, making wood a viable option for sustainable buildings (Rahman et al., 2022).
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Green Roofs and Living Walls: Vegetated roofs and walls can provide natural insulation, improve air quality, and reduce stormwater runoff. They can also contribute to a building's aesthetic appeal and create a more comfortable microclimate around the structure (Wong & Kenney, 2017).
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Bio-composites: These materials combine natural fibers like bamboo or hemp with recycled plastics or resins, creating lightweight yet strong building components with a lower environmental footprint than traditional materials (Rahman et al., 2022).
ii.
Smart Materials and Automation
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Phase Change Materials (PCMs): These innovative materials can absorb and release thermal energy, passively regulating indoor temperatures and reducing reliance on air conditioning (Akei et al., 2017).
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Building Automation Systems (Internet of Things (IoT) Sensors and Controls): Integrating sensors and automated controls into buildings allows for real-time monitoring and optimization of energy and water usage. This can significantly reduce energy consumption and improve overall building performance (International Energy Agency [IEA], 2023).
iii.
Digital Design and Fabrication
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Evaporative Cooling Systems: These systems use natural evaporation to cool buildings. Advancements in material science are leading to the development of more efficient and desiccant-integrated evaporative cooling systems that are well-suited for tropical climates (Huang et al., 2018).
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Building Information Modeling (BIM): BIM software allows for integrated design and analysis, optimizing building performance for tropical climates. BIM can model solar heat gain, natural ventilation patterns, and energy consumption (Eastman et al., 2011).
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Digital Fabrication: Advancements in 3D printing and prefabrication technologies offer exciting possibilities for rapid and efficient construction using locally sourced materials (Bogue, 2018).
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Robotic Construction: Robots can be used for automated and precise construction tasks, potentially improving safety and efficiency in tropical building projects (Liu et al., 2018).
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Computational Design: Advanced algorithms can generate design solutions specifically tailored to a tropical location's climatic conditions, optimizing factors like natural ventilation and solar shading (Eastman et al., 2011).
iv.
Renewable Energy Integration
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Building Integrated Photovoltaics (BIPV): Integrating solar panels into the building envelope can generate clean electricity on-site, reducing reliance on the grid and lowering energy costs (Liu et al., 2017).
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Micro Wind Turbines: Small-scale wind turbines strategically placed on buildings can harness wind energy to supplement a building's power needs (Manwell et al., 2002).
v.
Challenges and the Road Ahead
While these emerging technologies hold immense promise, challenges remain. Affordability, integrating new technologies into existing design and construction workflows, and ensuring long-term performance in tropical environments are all areas that require further research and development (Asif et al., 2013). However, by embracing innovation, collaboration between stakeholders, and ongoing research, these emerging technologies can pave the way for a more sustainable and resilient future for tropical architecture.

4.4. Historical Evolution and Theoretical Concepts of Building Energy for Efficiency

4.4.1. Historical Evolution of Building Energy Standards for Efficiency

The concept of energy efficiency in buildings has a surprisingly long history, with early efforts dating back to concerns about resource conservation and occupant comfort. Over time, these concerns have evolved alongside technological advancements, leading to the comprehensive energy standards we see today.
Early building regulations primarily focused on structural integrity, fire safety, and primary health considerations, with minimal emphasis on energy efficiency (Asif et al., 2013). However, people in ancient times still utilized passive design techniques like building orientation, natural ventilation, and thermal mass to create comfortable indoor environments with minimal energy use (Singh et al., 2014). These principles continue to be relevant in modern energy-efficient design. Early regulations in the 18th and 19th centuries often addressed ventilation and indoor air quality to ensure occupant health and comfort, indirectly promoting energy efficiency by minimizing the need for excessive heating or cooling. However, energy performance was not a primary concern (Fisk, 2000).
The widespread adoption of fossil fuels for heating and cooling buildings in the 20th century led to a growing awareness of energy consumption. The oil crises of the 1970s further emphasized the need for energy conservation measures in buildings (Asif et al., 2013). In response to these concerns, the latter half of the 20th century saw the development of the first building codes and standards that addressed energy efficiency. These early standards focused on fundamental aspects like insulation levels and building envelope performance (Ülkü et al., 2017).
The late 20th and early 21st centuries saw significant advancements in energy-efficient technologies like high-performance windows, efficient HVAC systems, and building automation systems. These advancements were gradually incorporated into building energy standards, leading to more stringent requirements (European Commission, 2023). Growing concerns about climate change and environmental degradation broadened the scope of building energy standards. Regulations began considering energy consumption during operation and the embodied energy associated with building materials and construction practices (Asif et al., 2013).
Building energy standards will likely continue to evolve, with a growing focus on achieving net-zero energy buildings. These buildings produce as much energy as they consume, minimizing their environmental impact (International Energy Agency [IEA], 2023). Regulations may shift towards performance-based approaches, allowing flexibility in design solutions as long as buildings meet specific energy performance targets (European Commission, 2023).
Examples of Historical Milestones include the 1976 US implementation of the ASHRAE Standard 90.1, the first national standard for energy efficiency in buildings (US Department of Energy [DOE], n.d.). and the 2000s introduction by The European Union of the Energy Performance of Buildings Directive (EPBD), a framework for setting national energy efficiency standards in buildings (European Commission, 2023).
The history of building energy standards reflects a continuous effort to balance energy consumption, occupant comfort, and environmental impact. As technology advances and environmental concerns intensify, we can expect even more stringent and comprehensive energy standards in the coming years, paving the way for a more sustainable built environment.

4.4.2. Theoretical Concepts for Building Energy Efficiency

Building energy efficiency is not just about saving money on utility bills; it is a complex field with a robust theoretical foundation. Key theoretical concepts that underpin strategies for achieving energy-efficient buildings are explained as follows:
i.
Thermodynamics and Heat Transfer
-
First Law of Thermodynamics: This fundamental law states that energy can neither be created nor destroyed, only transformed (Gellings, 1991). In buildings, this translates to understanding how heat flows through the building envelope (walls, roof, windows) and how to minimize unwanted heat gain or loss.
-
Heat Transfer Mechanisms: Understanding the three primary mechanisms of heat transfer – conduction, convection, and radiation – is crucial for selecting appropriate insulation materials and building envelope design strategies to control heat flow (American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), 2023).
ii.
Building Envelope Performance
-
Thermal Resistance (R-value): This metric indicates a material's ability to resist heat flow. Higher R-values signify better insulation, reducing unwanted heat transfer through walls, roofs, and floors (US Department of Energy [DOE], n.d.).
-
Airtightness: A well-sealed building envelope minimizes uncontrolled air leakage, preventing conditioned air from escaping and reducing the load on HVAC systems (Asif et al., 2013).
iii.
Passive Design Principles
-
Solar Orientation and Shading: Optimizing building orientation and strategically incorporating shading devices can significantly reduce reliance on mechanical heating and cooling (Singh et al., 2014).
-
Natural Ventilation: Natural ventilation strategies like cross-ventilation and stack ventilation can provide fresh air and reduce dependence on mechanical ventilation systems (Heiple et al., 2020).
iv.
Building Energy Modeling (BEM)
-
Virtual Building Prototypes: BEM allows for the creation of virtual building prototypes to simulate energy performance under various conditions. This enables architects and engineers to optimize energy-efficient design strategies before construction begins (Eastman et al., 2011).
-
Life Cycle Analysis (LCA): LCA is a comprehensive method for evaluating a building's environmental impact from its inception to its end, encompassing the extraction of raw materials, construction, operation, and demolition (Frascaria et al., 2021). Integrating LCA into energy efficiency analysis helps optimize building design for a lower environmental footprint.
v.
Human Factors and Behavioural Aspects
-
Occupancy Patterns: Understanding how occupants use a building and their thermal comfort preferences plays a role in optimizing energy use. Building automation systems that respond to occupancy patterns can further enhance efficiency (Heiple et al., 2020).
-
User Awareness and Education: Educating occupants about building energy features and encouraging responsible energy-saving practices can contribute significantly to overall energy efficiency (Asif et al., 2013).
Building energy efficiency is grounded in a rich theoretical framework that includes thermodynamics, heat transfer, building envelope performance, passive design principles, building energy modeling, life cycle analysis, and human factors. By understanding and integrating these concepts, architects, engineers, and policymakers can design and implement effective strategies for creating a more energy-efficient and sustainable built environment.

4.5. Types of Building Energy Regulations

Building energy regulations come in various forms, each aiming to promote energy efficiency in buildings through different approaches. Understanding these variations is crucial for stakeholders across the construction industry.
i.
Prescriptive Regulations
-
Specificity in Design Strategies: Prescriptive regulations define specific requirements for building components and systems, such as minimum insulation levels, window U-factors (a measure of heat transfer), and lighting power densities (European Commission, 2023). This approach ensures compliance but may limit flexibility in design solutions.
-
Ease of Enforcement: Prescriptive regulations are generally easier to enforce as they establish clear benchmarks (Ülkü et al., 2017).
ii.
Performance-Based Regulations
-
Focus on Overall Building Performance: These regulations set a target energy consumption level for the entire building, allowing designers more flexibility in achieving the target. Compliance can be demonstrated through building energy modeling or post-construction testing (International Energy Agency [IEA], 2023).
-
Requirement for Building Energy Modeling: Performance-based regulations often necessitate using Building Energy Modeling (BEM) software to demonstrate compliance, adding complexity to the design process (Crawley, 2005).
iii.
Hybrid Approaches
-
Combining Prescriptive and Performance Elements: Many regulations combine elements of both prescriptive and performance-based approaches. Specific requirements for crucial building elements might be set alongside overall performance targets, balancing prescriptive guidance and design flexibility (Ülkü et al., 2017).
iv.
Additional Regulatory Considerations
-
Stringency Levels: Building energy regulations can vary significantly in their level of stringency. Some may set minimum requirements, while others may establish more ambitious targets for high-performance buildings.
-
Building Types and Sizes: Regulations may be tailored to different building types, such as residential, commercial, or industrial buildings. Additionally, some regulations might have different requirements for new and existing buildings (US Department of Energy [DOE], n.d.).
-
Enforcement and Verification: Effective enforcement mechanisms and robust verification procedures are crucial for ensuring compliance with building energy regulations (European Commission, 2023).
v.
Examples of Building Energy Regulations
-
International Energy Conservation Code (IECC) in the US: The IECC is a prescriptive code that establishes minimum energy efficiency requirements for commercial and residential buildings across the United States (US Department of Energy [DOE], n.d.).
-
The Energy Performance of Buildings Directive (EPBD) in the EU: The EPBD is a performance-based framework that sets energy efficiency targets for buildings in the European Union, allowing flexibility in achieving compliance (European Commission, 2023).

5. Conclusion

5.1. Conclusion Based on the Findings

The findings of this study highlight the critical role of building energy regulations in driving sustainable architecture in tropical regions. While there is a growing recognition of the importance of sustainable design, current regulations often need to address the unique energy challenges posed by tropical climates more effectively. A significant gap exists between the potential of sustainable architecture to mitigate energy consumption and the actual implementation of energy-efficient strategies in buildings.
The research highlights the need for a comprehensive approach to building energy regulation incorporating various factors, including climate conditions, building typology, and occupant behavior. Passive design strategies, renewable energy integration, and material selection are key determinants of energy performance in tropical buildings. However, the lack of standardized performance metrics and the limited enforcement of existing regulations hinder the widespread adoption of sustainable practices.

5.2. Recommendations Based on Findings

To accelerate the transition towards sustainable architecture in tropical regions, the following recommendations are proposed:
i.
Strengthen Building Energy Regulations: Governments should develop and enforce robust building energy codes that mandate the integration of sustainable design principles. These regulations should include performance-based standards to encourage innovative solutions.
ii.
Incentivize Sustainable Practices: Financial incentives, such as tax breaks or rebates, can stimulate the adoption of energy-efficient technologies and materials. Governments can also explore public-private partnerships to promote sustainable building projects.
iii.
Capacity Building: Invest in education and training programs for architects, engineers, and policymakers to enhance their knowledge of sustainable design and building energy efficiency.
iv.
Research and Development: Continue research to develop innovative building technologies and materials specifically tailored to tropical climates.
v.
Data Collection and Monitoring: Establish a comprehensive system for collecting and analyzing building energy performance data to inform policymaking and track progress toward sustainability goals.

5.3. Areas for Further Studies

To deepen understanding of the complex relationship between sustainable architecture and building energy regulations in tropical regions, further research is warranted in the following areas:
i.
Long-term Performance Evaluation: Conduct longitudinal studies to assess sustainable buildings' long-term energy performance and durability in tropical climates.
ii.
Economic Analysis: Quantify the benefits of implementing sustainable building practices, including cost-saving potential and return on investment.
iii.
Policy Impact Assessment: Evaluate the effectiveness of different regulatory approaches in promoting sustainable architecture and energy efficiency.
iv.
Occupant Behaviour Analysis: Investigate the influence of occupant behavior on building energy consumption and explore strategies to encourage energy-saving practices.
v.
Indigenous Knowledge: Explore the potential of incorporating traditional building wisdom and materials into contemporary sustainable architecture.
By addressing these research questions, future studies can contribute to developing more effective policies and strategies for achieving sustainable and energy-efficient built environments in tropical regions.

Authors Contributions

U. K. Ugah: Conceptualization, Methodology, Validation, Writing – original draft, Writing – review & editing. O. D. Babalola: Supervision, Writing – original draft, Writing – review & editing. C. I. Nduka-Kalu: Writing – original draft, Writing – review & editing.

Acknowledgements

The authors express gratitude to Covenant University, Ota, Nigeria, for providing the support and facilities that enabled the research. Additionally, appreciation is extended to the anonymous reviewers whose valuable comments and suggestions helped improve this paper’s initial version.

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