Architecture, Building and Planning - Research Publications
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ItemBarriers to implementation of sustainable construction in India(The University of Melbourne, 2023)Abstract: The Indian construction industry was estimated to be worth three trillion INR in 2022 and is expected to be the third largest construction market by 2025. The industry is responsible for a large amount of energy consumption, which not only contributes to the emission of greenhouse gases, but also adversely impacts resources like land, waterbodies, minerals, and other naturally sourced materials. Hence, implementing sustainable construction practices across the project life cycle is essential to reducing the detrimental impacts of the industry. Despite having 3 green building rating systems (GRIHA, IGBC, and LEED) and adopting certain national level initiatives, there is an absence of a systematic regulatory framework for the incorporation of sustainability principles in the Indian construction industry. It is critical to determine the existing issues that prevail in the industry to address the barriers in a timely manner. This paper determines the critical barriers to incorporating sustainable construction in India by reviewing the academic literature, Environmental Performance Index (EPI), and Sustainable Development Goals (SDG) 2022 reports. Unskilled workforce, low productivity, lack of monitoring schemes, inadequate technology, poor team integration and collaboration are the key barriers that are deduced from the systematic literature review. The ongoing national level initiatives and schemes promoting multiple goals of SDGs are also identified. The administrative framework of the Indian construction industry includes ministries, state departments, local authorities, and regulatory councils. Every state in India has building bye laws that differ from those of other states and this has also been identified as a barrier. One of the solutions determined by experts and researchers is for the Indian construction industry to comply with the 2030 Agenda for sustainable development. In order to accomplish that, policy makers, sustainable construction practitioners, and industry professionals must develop specific grassroot level mitigation factors to counter the key barriers.
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ItemEvaluating the impact of material service life on embodied energy of residential villas in the United Arab Emirates(Emerald, 2024)Purpose: Recently, there has been a shift toward the embodied energy assessment of buildings. However, the impact of material service life on the life-cycle embodied energy has received little attention. We aimed to address this knowledge gap, particularly in the context of the UAE and investigated the embodied energy associated with the use of concrete and other materials commonly used in residential buildings in the hot desert climate of the UAE. Design/methodology/approach: Using input–output based hybrid analysis, we quantified the life-cycle embodied energy of a villa in the UAE with over 50 years of building life using the average, minimum, and maximum material service life values. Mathematical calculations were performed using MS Excel, and a detailed bill of quantities with >170 building materials and components of the villa were used for investigation. Findings: For the base case, the initial embodied energy was 57% (7390.5 GJ), whereas the recurrent embodied energy was 43% (5,690 GJ) of the life-cycle embodied energy based on average material service life values. The proportion of the recurrent embodied energy with minimum material service life values was increased to 68% of the life-cycle embodied energy, while it dropped to 15% with maximum material service life values. Originality/value: The findings provide new data to guide building construction in the UAE and show that recurrent embodied energy contributes significantly to life-cycle energy demand. Further, the study of material service life variations provides deeper insights into future building material specifications and management considerations for building maintenance.
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ItemExploring the application of the Carbon Risk Real Estate Monitor tool for Australian office buildings(PRRES, 2024)Urgent transitions to mitigate effects of climate change are needed. Policies and reduction targets for greenhouse gas emissions associated with the built environment are emerging. Meeting these targets will be essential to ensure built assets are not stranded. Asset ‘stranding’ occurs when a building no longer meets emissions targets and, as a result, may not be allowed to be occupied or rented, resulting in implications for asset income and occupancy. The Carbon Risk Real Estate Monitor (CRREM) tool was developed in Europe to enable emissions analysis of assets and portfolios to reduce the risk of stranding. CRREM is regarded as one of the most valuable tools for asset management and valuations in Europe and UK, however, in Australia it has only recently been adapted for local conditions. This research provides key insights into the effective use of CRREM for Australian built assets.
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ItemInvestigating the Embodied Energy of Wall Assembly with Various Material Service Life Scenarios(Springer Nature, 2023)Studies have advocated that there is much less research on the impact of embodied energy. Researchers have asserted that a building’s embodied energy can be as high as 60% of the life cycle energy. However, there is insufficient research and understanding of embodied energy impacts and its relationship with material specification and service life. This research aims to fill this gap by investigating the life cycle embodied energy of a villa in the United Arab Emirates with particular emphasis on the wall assembly. The findings show that the embodied energy impact of the wall structure and wall finishes was found to be 19.7% and 11.7% of the villa’s life cycle embodied energy (LCEE), respectively. Alternative material service life (MSL) scenarios for the wall assembly shows that using minimum material service life (MSL) values results in a 54% increase in LCEE of the wall, and 74% increase in the LCEE of the villa. For maximum MSL, the findings show a 27% and 31% decrease in LCEE of walls and villa, respectively. Alternative wall finishes show that wallpaper as a replacement of water-based paint will increase the LCEE of the villa by 28%.
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ItemLife cycle environmental benchmarks for Flemish dwellings(IOP Publishing, 2024-03-01)To reduce the environmental effects caused by building construction and operation, life cycle assessment (LCA) is increasingly applied. In recent years, national building regulations have implemented LCA requirements to support building life cycle impact reduction. A key element in these regulations are environmental benchmarks which allow designers to compare their building designs with reference values. This study aims to develop bottom-up life cycle environmental benchmarks that represent the range of environmental impact results achieved with conventional construction in Flanders, Belgium. For this purpose, the study investigates the potential of using a database of building energy performance calculations. Specifically, this study considers 39 residential buildings identified as representative of the Flemish energy performance of buildings database of 2015–2016, applying modifications to establish scenarios that are still relevant in 2025. The buildings are assessed with the Belgian LCA tool TOTEM to calculate an aggregated environmental score based on the European product environmental footprint (PEF) weighting approach and including 12 main impact categories. In addition to the aggregated score, the climate change (CC) indicator is analysed individually. In view of the benchmarks, variations were applied to the 39 original buildings in terms of heating system and materialisation. The variation in heating system included changing gas boilers to electric heat pumps to comply with upcoming (2025) Flemish building regulations. The variations in building materials included three sets of conventional Flemish building element compositions that were applied to generate a wider spread of impact results as a basis for benchmarks. Benchmark values were derived through a statistical analysis of the 117 modelled variants: a best-practice value (10th percentile), reference value (median) and limit value (90th percentile). For the environmental score, the benchmark values are 86, 107 and 141 millipoints per square meter of gross heated floor area (GHFA) (mPt m−2GHFA), respectively; and for CC, the benchmark values are 844, 1015 and 1284 kg CO2-eq m−2 GHFA. Finally, the study discusses the representativeness, implications and limitations of the final benchmarks and benchmark approach.
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ItemEPiC grasshopper: A bottom-up parametric tool to quantify life cycle embodied environmental flows of buildings and infrastructure assets(Elsevier BV, 2024-01)Reducing the embodied environmental flows of built assets is becoming increasingly important and is a key priority for actors in the built environment to improve life cycle environmental performance. Policies and related targets for embodied environmental flow reductions are emerging. Despite this, tools for quantifying the life cycle embodied environmental flows of built assets are limited in variety and scope. Parametric life cycle assessment (LCA) tools have emerged to address some of these limitations. These tools can enhance decision making, be embedded directly into CAD programs, and offer real-time LCA calculations across multiple design variations. Yet, existing parametric tools for LCA rely on process-based material environmental flow data, limited geometries, limited real-time data visualisation capacity, and often require specialised technical expertise to use. These gaps limit their ability to provide transparent, robust, and rapid assessments. This paper introduces EPiC Grasshopper, an open-source, open-access, bottom-up, parametric tool that enables the quantification of life cycle embodied environmental flows at the early stages of built asset design, bridging the aforementioned gaps. The key characteristics and functionalities of the tool are described, followed by verification (checking that calculations are correct), validation (checking that results are representative of reality), and demonstration of its application to two built asset case studies, i.e. parametrically-defined Australian house and road. The paper shows how the tool can be used to generate designs to meet specific embodied environmental flow targets as well as streamline and increase the uptake of embodied environmental flow assessment and considerations in built asset design workflows.
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ItemExploring the environmental assessment of circular economy in the construction industry: A scoping review(Elsevier, 2023-11-01)The literature on the evaluation of environmental performance within the circular economy (CE) domain is notably extensive, encompassing a considerable body of work spanning guidelines, case studies and software tools. Nonetheless, a comprehensive overview that encompasses the entirety of the knowledge landscape in this area remains notably absent. To address this scholarly gap, the present study undertakes a scoping review. Departing from previous inquiries which have predominantly focused on scholarly literature, the study amalgamates diverse knowledge sources. Through a meticulously orchestrated search and analysis process that integrates insights from academic databases and other knowledge reservoirs in the Australian context, a compendium of 249 indicators is delineated. As one of the pioneering endeavours of this nature, this study functions as a contemporary reference, catering to researchers, policy makers and practitioners, while providing multifaceted perspectives on assessing environmental ramifications within CE research. In theoretical terms, this investigation makes an in-depth contribution to the CE field by introducing a methodical and all-encompassing framework, interlinking life cycle phases and system boundaries for environmental evaluation within the CE paradigm. The findings furnish a reliable catalogue of 12 pivotal themes that merit prioritisation in the evaluation of environmental impacts tied to CE strategies. On a practical level, the study yields valuable instruments for researchers, practitioners and policy makers, equipping them with the means to gauge the efficacy of their CE endeavours, thereby facilitating data-driven decision-making processes.
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ItemLife cycle energy and greenhouse gas emissions of a traditional and a smart HVAC control system for Australian office buildings(Elsevier BV, 2024-04)In recent years, many novel smart technologies have been proposed to reduce the energy consumption and greenhouse gas (GHG) emissions attributed to the building sector. One such application of these technologies is the reduction of the Heating, Ventilation and Air Conditioning (HVAC) energy needs and GHG emissions using smart control systems. The environmental benefits of smart control systems during building operation have been explored in many studies, however, their embodied effects, associated with the extraction of raw materials, manufacturing and replacement are often overlooked. Accordingly, this study quantifies the life cycle energy needs and GHG emissions of a smart HVAC control system and assesses its potential for reducing the HVAC operational energy and GHG emissions in an Australian office building. A comparative assessment is performed, considering a traditional HVAC control system and an equivalent smart HVAC control system. The components of both the traditional and smart control systems are specified based on the characteristics of these systems as well as the layout of the serviced spaces in the reference building. The embodied energy and GHG emissions of both the traditional and smart control systems are quantified through a hybrid life cycle inventory (LCI) approach. To evaluate the effects of these control systems on the building HVAC operational energy, a building energy simulation is performed by applying the control logics of both systems. The results show that energy and GHG emissions savings in the HVAC operational offset the additional energy needs and GHG emissions of deploying the smart HVAC control system.
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ItemNo Preview AvailableDemonstrating circular life cycle sustainability assessment – a case study of recycled carbon concrete(Elsevier, 2023-12)To counter the high consumption of resources and environmental emissions in the construction sector, innovative materials such as carbon-reinforced concrete (CRC) are needed. CRC has the potential to lower the resource use and emissions of the construction sector and lead to a circular economy (CE). To understand the overall circularity and sustainability performance of such materials, holistic assessments are needed. This study demonstrated the application of the newly developed circular life cycle sustainability assessment (C-LCSA) framework that is based on CE indicators and life cycle sustainability assessment (LCSA). The framework was applied to an industrial floor that was made from recycled CRC scrap (R–CRC industrial floor) in its development phase – using both the concrete faction and the carbon fiber fraction. The material circularity indicator (MCI) was used for the circularity assessment. It was applied in parallel to a life cycle assessment (LCA), life cycle costing (LCC), and a social hotspot assessment, using the same functional unit and system boundaries. The cut-off approach used was in line with the technical system boundaries. The results showed that the contribution to the circularity of the R–CRC industrial floor was high (0.8184) due to the use of recycled material and the potential of being recycled again. The global warming potential (GWP, 167 kg CO2 eq.) was lower while the human toxicity potential (HTP) was higher compared to similar products. The production costs far exceeded the current price of a comparable product which might be related to the inefficiencies in the production at the laboratory scale in the development phase of the R–CRC industrial floor. Social risks were found for health and safety, as well as for the social acceptance of the floor due to technical uncertainties. Increasing the circularity further by only using recycled aggregates mostly showed positive effects on the environmental impacts. However, HTP and costs increased. General statements on the interlinkages between a higher circularity and positive impacts on sustainability performance cannot necessarily be made. Instead, a robust and holistic assessment of new products is needed. C-LCSA has demonstrated its effectiveness as a reliable framework for identifying interlinkages and trade-offs between the different sustainability dimensions and circularity. Further studies should be conducted to validate and demonstrate the C-LCSA framework on different products.
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ItemFifth-generation district heating and cooling: Opportunities and implementation challenges in a mild climate(Elsevier, 2024-01-01)Fifth-generation district heating and cooling (5GDHC) systems have the potential to provide simultaneous heating and cooling, allowing for energy exchange between users with different needs. However, their viability in mild climates with a higher share of cooling demand remains unclear. In this paper, we propose a framework for assessing the engineering, economic and environmental performance of a 5GDHC system compared to a state-of-the-art business-as-usual solution and demonstrate it through a practical case study for a university campus in Melbourne, Australia. When accessible heat sources and sinks are available, the 5GDHC system provides a cost-effective solution, with annual cost savings between 9 and 29 % and GHG emissions reduction between 25 and 58 % compared to an already advanced business-as-usual system. Additionally, by using peak off-peak tariffs and an hourly emission factor for the electricity consumed, we demonstrate the 5GDHC operational flexibility in pursuing different objectives, such as minimising cost or emissions, respectively. The results suggest that 5GDHC systems are an economically and environmentally viable solution in milder climates, and a successful implementation of 5GDHC in Australia can create new market opportunities and pave the way for its adoption in other countries with similar climatic conditions and no established history of district heating systems.