Architecture, Building and Planning - Research Publications
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ItemThe lIfe cycle performance of Monomur in Australian residential construction(Green Building Council Spain, 2014)Brick veneer is the most dominant construction type in Australia; however it is not necessarily the most advantageous for the climate. Mass wall types, where massing is evident on the interior of the building, can help to achieve greater thermal performance. Monomur thermal blocks are a thermal mass system, based on single leaf construction. They are resistant to compression, transfer of heat, and are made from natural clay. Monomur has shown to benefit construction in Europe, most predominantly France, where the push for low energy buildings is high on the national agenda. This study aimed to determine the life cycle energy performance of the use of the monomur system in Australian residential construction. A life cycle energy analysis (LCEA) was used to quantify and compare the life cycle energy performance of two case study houses, one built from monomur and one from brick veneer. It was shown that there is minimal difference in the performance of these two construction approaches, paving the way for the potential use of monomur in the Australian context.
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ItemAn early-stage life cycle model for low-energy buildiings(Green Building Council Spain, 2014-10-30)The aim of this study is to demonstrate the application of a model previously developed by the authors for low-energy building design, to show how the availability of comparable energy performance information at the building design stage can be used to better optimise a building’s energy performance. The life cycle energy demand of a case study building was quantified using a comprehensive embodied energy assessment technique and TRNSYS thermal energy simulation software. The building was then modelled with variations to its external assemblies in an attempt to optimise its life cycle energy performance. The alternative assemblies chosen were those shown through the authors’ early-stage life cycle energy model to result in the lowest life cycle energy demand for each building element. The study showed that significant life cycle energy savings, up to 45%, are possible through the modelling of individual building elements for the case study building.
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ItemBuilding service life and its effect on the life cycle embodied energy of buildings(Elsevier, 2015)The building sector is responsible for significant energy demands. An understanding of where this occurs across the building life cycle is critical for optimal targeting of energy reduction efforts. The energy embodied in a building can be significant, yet is not well understood, especially the on-going ‘recurrent’ embodied energy associated with material replacement and building refurbishment. A key factor affecting this ‘recurrent’ embodied energy is a building's service life. The aim of this study was to investigate the relationship between the service life and the life cycle embodied energy of buildings. The embodied energy of a detached residential building was calculated for a building service life range of 1–150 years. The results show that variations in building service life can have a considerable effect on the life cycle embodied energy demand of a building. A 29% reduction in life cycle embodied energy was found for the case study building by extending its life from 50 to 150 years. This indicates the importance of including recurrent embodied energy in building life cycle energy analyses as well as integrating building service life considerations when designing and managing buildings for improved energy performance.
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ItemConcept and barriers for the economic value of low-energy houses(Royal Institution of Chartered Surveyors, 2015)This study explores the market revealed price of low-energy residential buildings and why the economic value of low-energy housing products is less transparent in active residential markets. It explores Australian and Japanese conditions and examines the proposition by using embodied energy, operational energy and market price data of selected housing stock in Australia. The study aims to examine a new perspective towards understanding the barriers to ascertaining the economic value of low-energy buildings. In particular, the study examines the composition of energy consumption associated with the residential property life cycle. Operational energy is linked to consumer preference by its inter-temporal value estimate of future expected utility or benefit flow. A ‘low’ embodied energy house is an environmental construct, which does not appear to currently link to short-term market value perception. It does not strongly link to an expected (intuitive) benefit. This ‘gap/disconnect’ creates a barrier to estimating a holistic economic value of low-energy residential property.
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ItemExploring the relationship between Melbourne’s water metabolism and urban characteristics(State of Australian Cities Research Network, 2015)Cities can be seen as complex urban systems that mobilise local and global resource flows to meet the needs of their inhabitants and their manufacturing sector. However, the local consumption of resources can be responsible for major local and global environmental changes that impact the human health and wellbeing inside and outside of the boundary of the urban system. With global urban population expected to continue to grow, the mitigation of further future environmental pressures from urban consumption is of critical importance. The complexity of the interrelationships between the local social, political, cultural, economic and environmental facets of a city as well as the interrelationship between these local characteristics and urban consumption, dictate that each city will have a different set of parameters that drive urban consumption. This research will investigate this issue by exploring the relationship between Melbourne’s water metabolism and its urban characteristics. In practice, this study will correlate the spatially disaggregated water use of Melbourne with local factors such as demography, average income, territorial organisation, etc. It will then be possible to identify which urban characteristics have the greatest influence on water use and ultimately help to inform the development and implementation of the most appropriate and best targeted policies for reducing water use across Melbourne Metropolitan Area.
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ItemComparing a territorial-based and a consumption-based approach to assess the local and global environmental performance of cities(Elsevier, 2018)In the framework of pressing local and global environmental challenges it is essential to understand that cities are complex systems dependent on and linked to the rest of the world through global supply chains that embody an array of environmental flows. Cities are thus a complex articulation that intertwine local and global challenges which rely at their extended hinterland for their resource use and pollution emission. To assess the environmental sustainability of an urban area in a comprehensive manner, it is not only necessary to measure its local and direct environmental performance but also to understand and take into account its global and indirect environmental counterparts. This paper presents a comparative analysis of a territorial-based and a consumption-based approach to estimate both direct and embodied resource use and pollution flows for the case of Brussels Capital Region (Belgium). The territorial-based approach is based on local energy, water and material consumption measured data as well as measured data on waste generation and pollution emissions. The estimation of indirect resource use and pollution emissions (or consumption-based approach) is based on the regional IO-tables of the city-region of Brussels extended with multi-region input-output tables, taking into account the global flows of consumption. The comparison of these two approaches is particularly relevant in the case of cities that have limited productive activities and limited or no extraction of materials as the impact on the hinterland is often underestimated or neglected by local (environmental) policies which are only based on territorial-based figures. The results show that the indirect primary energy use, GHG emissions and material use estimated by the consumption-based approach is more than three times higher than local measures indicate. The embodied water use, estimated via IOA, was over 40 times higher than the local water consumption. These results show that territorial-based approach using local data underestimate the resource needs and pollution emissions of a city and can therefore be insufficient or even be misguiding. By mapping the origin of embodied flows it is in fact possible to illustrate the open character of an urban economy and its dependence on the global hinterland. Finally, this paper discusses the possibility and relevance to combine these two approaches to create a hybrid framework that measures the full environmental performance of cities both accurately and comprehensively.
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ItemAgile housing for an ageing Australia(The Architectural Science Association and The University of Adelaide, 2016)By 2055, Australia’s 65+ population will have doubled and, if current strategies are followed, it is likely that the housing available will be inappropriate. Today’s housing stock will still be in use yet few developers and designers are capitalising on the potential of agile housing and, more broadly, the creation of age-friendly neighbourhoods. Current changes in design and prefabrication technology, along with government initiatives for ageing at home in preference to institutional care, have the potential to transform the way we consider housing design to support changing demographics. This research considers agile housing for an ageing population from the perspectives of urban planning, design, prefabrication, sustainability, life-cycle costing and social gerontology. We highlight the need for interdisciplinary perspectives in order to consider how entrenched policy, planning, design and construction practices can be encouraged to change through advocacy, design speculation and scenario testing to deliver right-sized housing. A cradle-to-grave perspective requires the exploration of the social and practical benefits of housing in multigenerational communities. This research links to concurrent work on affordable housing solutions and the potential of an industry, government and academic partnership to present an Australian Housing Exposition, that will highlight the possibilities of a more agile housing approach.
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ItemDirectionally selective shading control in maritime sub-tropical and temperate climates: Life cycle energy implications for office buildings(Elsevier, 2016)Scheduling directionally selective shading devices to increase or decrease their level of occlusion relative to the total incoming solar radiation has the benefit of controlling solar heat gain during a variety of sky conditions and allowing more constant illuminance levels to be achieved within a building. In this study, hourly sky condition and annual solar angles were used to describe the tilt of the slats of an external directionally selective shading control for an external venetian blind on an office building in Melbourne and Brisbane, Australia. The life cycle energy demand associated with this shading control was compared to a static base case with an external overhang and internal venetians. The analysis was extended to the HVAC system which was sized to account for the effect of the shading on solar gain and the artificial lighting requirement. It was found that the embodied energy of the HVAC and shading components accounted for between 21.7% and 25.5% of the total life cycle energy of these systems over 25 years. There was a reduction in embodied and operational energy requirements over a 25 year life cycle for the external venetian blind control of 24.9% for Melbourne and 24.0% for Brisbane relative to the static base case. Based on the simulation results, office buildings with equator facing facades located in similar climates and latitudes may have the potential for equivalent life cycle energy reductions when external directionally selective shading controls are employed to moderate overheating and daylighting.
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ItemThe economic value of low-energy housing(Taylor and Francis, 2016-01-01)This paper explores a new perspective towards understanding barriers to ascertaining the economic value of low-energy housing. It examines why the economic value of low-energy housing is less transparent in active markets; this is investigated from the valuation principle perspectives of embodied energy and operational energy in residential dwellings. The focus is placed on the composition of energy consumption associated with the housing product life cycle. Low operational energy of a dwelling is linked to consumer preference by the inter-temporal value estimate of expected benefits. However, “low” embodied energy housing is an ecological construct and does not appear to be directly linked to short-term market value or an expected (intuitive) economic motive. This “gap/disconnect”, alongside some practical “barriers” in the market economy, has created a challenge in deriving the economic value of low-energy housing. The barrier to economic value of low-energy housing is methodological and by adopting a life cycle approach to assessing and measuring energy in a house that incorporates embodied energy and operational energy, greater clarity can be achieved which may lead to a better informed market, enhancing transparency and allowing consumer choice to direct and value the broader benefits of low-energy housing.
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ItemBarriers to improving the environmental performance of construction waste management in remote communities(Elsevier, 2017)The construction sector represents one of the most significant contributors to global waste production and is responsible for over 30% of the waste that ends up in landfill. Sending construction waste to landfill results in a broad range of environmental consequences including: degradation of land, habitat destruction, contamination of soil and groundwater, and release of methane. There is a growing awareness of the need to divert construction and demolition (C&D) waste from landfill for reuse or recycling. This helps maximise the value of the resources embodied in these materials and reduce the demand for virgin raw materials and the associated environment effects resulting from their extraction, processing and manufacture. However, diversion of C&D waste to reuse or recycling in remote communities can be difficult and costly. This poses a significant challenge for improving the environmental performance of construction waste management in these communities. A housing refurbishment project in Alice Springs, a remote town in central Australia, was used to identify the barriers associated with improving the environmental performance of construction waste management in remote communities. This study considers the materials removed as part of the demolition phase of the project. Material types and quantities were documented and on-site and off-site waste management practices observed. Reasons for waste management decisions were recorded. The study identified a range of barriers to improving the environmental performance of construction waste management in remote communities. These include cost and time associated with on-site waste management, industry culture, lack of education, competing project priorities, and lack of financial incentive. Greater incentives to encourage the diversion of C&D waste from landfill are needed, in particular. This and other strategies for improving construction waste management practices in remote communities must be targeted at the context of individual communities though, due to their unique characteristics.