Infrastructure Engineering - Research Publications
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ItemThe carbon footprint of treating patients with septic shock in the intensive care unit(College of Intensive Care Medicine of Australia and New Zealand, 2018-12-01)OBJECTIVE: To use life cycle assessment to determine the environmental footprint of the care of patients with septic shock in the intensive care unit (ICU). DESIGN, SETTING AND PARTICIPANTS: Prospective, observational life cycle assessment examining the use of energy for heating, ventilation and air conditioning; lighting; machines; and all consumables and waste associated with treating ten patients with septic shock in the ICU at BarnesJewish Hospital, St. Louis, MO, United States (US-ICU) and ten patients at Footscray Hospital, Melbourne, Vic, Australia (Aus-ICU). MAIN OUTCOME MEASURES: Environmental footprint, particularly greenhouse gas emissions. RESULTS: Energy use per patient averaged 272 kWh/day for the US-ICU and 143 kWh/day for the Aus-ICU. The average daily amount of single-use materials per patient was 3.4 kg (range, 1.0-6.3 kg) for the US-ICU and 3.4 kg (range, 1.2-8.7 kg) for the Aus-ICU. The average daily particularly greenhouse gas emissions arising from treating patients in the US-ICU was 178 kg carbon dioxide equivalent (CO2-e) emissions (range, 165-228 kg CO2-e), while for the Aus-ICU the carbon footprint was 88 kg CO2-e (range, 77-107 kg CO2-e). Energy accounted for 155 kg CO2-e in the US-ICU (87%) and 67 kg CO2-e in the Aus-ICU (76%). The daily treatment of one patient with septic shock in the US-ICU was equivalent to the total daily carbon footprint of 3.5 Americans' CO2-e emissions, and for the Aus-ICU, it was equivalent to the emissions of 1.5 Australians. CONCLUSION: The carbon footprints of the ICUs were dominated by the energy use for heating, ventilation and air conditioning; consumables were relatively less important, with limited effect of intensity of patient care. There is large opportunity for reducing the ICUs' carbon footprint by improving the energy efficiency of buildings and increasing the use of renewable energy sources.
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ItemOpening the door on refrigerator energy consumption: quantifying the key drivers in the home(SPRINGER, 2018-08)There is little concrete understanding of the energy consumption of refrigerating appliances during normal use or the main influences on their energy consumption. To date, no widely accepted method to disaggregate measured energy consumption measured in the home into its key components has been demonstrated. This paper examines the main external factors that impact on the energy consumption of existing refrigerating appliances in the home and how they respond to changing conditions, namely: room air temperature, defrosting behaviour and user interactions. Analysis of field data from 235 homes in Australia demonstrates that room air temperature is by far the largest factor accounting for typically around 75% of total energy consumption. Where present, energy used for defrosting is relatively small at around 10%, but this does vary by household and the type of defrost controller. User interactions typically account for 15% of total energy consumed by main household refrigerating appliances, but this varies from a few percent to as much as 45% in large households. The method set out in this paper provides a basis for more in depth analysis and a better understanding of energy consumption of household refrigerators in different regions.
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ItemNo Preview AvailableA pilot study on users’ IEQ perceptions in a residential aged care facility in Melbourne(RMIT, 2018-11-29)The aged population in Australia is expanding rapidly. To cater for the Australia’s ageing population, there is a significant increase in demand for aged care facilities over the coming decades. The indoor environmental quality (IEQ) affects users’ physical health and psychological wellbeing. However, systematic research on the relationship between users’ perceptions and IEQ of aged care facilities has yet to be developed. In this pilot study, a residential aged care facility in Melbourne was selected as a case study for investigating the differences between the measured IEQ data and the users’ perceived individual comfort. A questionnaire survey was conducted to collect the perceptions of users on IEQ. Environmental sensors which enable web-based data monitoring were deployed. The measured data were then analysed together with the questionnaire survey results for drawing a comparison with the users’ perceptions. It was found that the measurements by environmental sensors are realistic and the survey questionnaires are appropriate for the study. For the future surveys, the language barrier needs to be considered for non-English speakers.
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ItemNo Preview AvailableSolar chilled drinking water sourced from thin air: Modelling and simulation of a solar powered atmospheric water generator(Modelling and Simulation Society of Australia and New Zealand, 2013-12-01)It is expected that there will be water scarcity in the future under the changing climate. Therefore investigations of innovative and environmentally friendly ways to produce portable water are very much essential. Atmospheric water generators (AWGs) apply vapour compression refrigeration to extract water vapour from the surrounding air. They produce drinking quality water and they require moist air and electricity. The required electricity may be produced by solar photovoltaic (PV) panels. By using solar energy the environmental impacts of an AWG associated with electricity consumption could be substantially reduced. The availability of solar energy and high humidity of air coincide with the drinking water demand. As of today the performance characteristics of stand-alone solar PV powered AWG is unknown. To address this knowledge gap a simulation model of such system has been developed. The model focuses on an individual phenomenon such as solar radiation availability, solar PV electricity output, battery storage, moisture content in the air and heat and mass transfer at the vapour compression refrigeration. The aim of this paper is to present the transient model developed and the simulation results. Kasaragod district in the state of Kerala, India is selected as the study area. Drinking water availability is a major issue in this district during the months from February to early June. Daily climate variables like temperature, maximum and minimum relative humidity, wind speed and global solar radiation on horizontal plane and wind speed were obtained from a meteorological station located in Kasaragod. A simulation model has been developed in TRNSYS with the following components: PV modules, Batteries, Regulator, Inverter and Atmospheric Water Generator. By using the model developed the capacity of the AWG, the number PV modules, the capacity of the battery bank required were determined for minimum daily water production of 15 L. The water extraction efficiency of the AWG investigated varies between 5.4% and 9.3% for Kasaragod. The cooling CCOPs of the AWG investigated are between 4 and 5, which is better than conventional air-to-air heat pump. Based on the analysis it was concluded that the monthly average daily efficiency is strongly correlated to the monthly average relative humidity of the ambient air. The monthly average daily efficiency is defined as average of all the daily average efficiency for a month. The validation of the simulation model with experiments to enable practical system design optimisations, and the development of control algorithms to obtain better performance by using the validated model are recommended for the future studies.
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ItemNo Preview AvailableINVESTIGATING POTENTIAL COMFORT BENEFITS OF BIOLOGICALLY-INSPIRED BUILDING SKINS(INT BUILDING PERFORMANCE SIMULATION ASSOC-IBPSA, 2013)
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ItemAn analysis of the feasibility and implications of using crude palm oil as renewable fuel for electricity generation in Indonesia(Australian Solar Energy Society, 2014)This paper explores the use of Crude Palm Oil (CPO) as a renewable fuel for electricity generation in Indonesia to meet the government liquid biofuel target of 5% by 2025. Long-range Energy Alternatives Planning (LEAP) system was employed to model the Indonesian energy system and forecast the energy demand up to 2025. Annual energy demand was assumed to grow at 6% and PLN (Indonesia’s stateowned electricity company) business plan to meet a 94% electrification access in 2020 is used to forecast the electricity consumption. The results suggest that relying on CPO alone as the fossil fuel substitute in the electricity generation could not meet the biofuel target. However, combining the use of CPO in the power generation and implementing liquid biofuel blend in the demand consumption recommended by the engine manufacturers would increase the overall biofuel contribution to 5.8% of the total energy mix. This means meeting the national target by 2025 could be successful without compelling engine manufacturers to accommodate the higher biofuel to fossil fuel blending ratios. The target also requires a total liquid biofuel and CPO of about 27.1 GL in 2025. In energy terms, this is equivalent to 926 PJ or about 159 million barrels of crude oil. The results imply that it may have detrimental environmental impact, as it requires 5.5 Mha of land area for biofuel feedstock plantations. Preliminary estimate of greenhouse gas (GHG) emission due to land use alone could reach up to 62 Mt CO2-e annually. Such a release could be prevented and even promises a saving if the land sought for biofuel plantation comes from low carbon stock land cover. On the positive note, this could offer employment opportunities to about 3.57 million people as well as investment in the agricultural and biofuel processing industry.
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ItemOptimisation of a seasonal thermal energy storage system for space heating in cold climate zones(AAEE - Institute for Sustainable Technologies (AEE INTEC), 2018-10-04)The parameter optimised for a seasonal thermal energy storage (STES) system based on life cycle cost (LCC) is a unique investigation. Although STES with ground coupled heat pump (GCHP) and solar collector system have been verified and validated in other countries, the result cannot be used for particular cold climates because the performance of the system is highly climate sensitive. Therefore, this study intends to fill the knowledge gap by identifying optimum sets of system variables for four selected cities in cold climate zones.
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ItemEducation & training for zero energy and lean manufacturing & construction of housing in Australia(Curtin University, 2018-09-27)For zero energy and efficient production of mass customised housing, good outcomes are possible only when it is supportedby a good education curriculum and infrastructure. This paper reports on the status of education for zero energy and lean manufacturing and construction of houses in Australia by investigating offerings of Victorian schools, vocational training and highereducation sectors in these respects. The courses currently offered within Australian Qualifications Framework (AQF) were assessed. It was found that there are still gaps in the education infrastructure that do not provide fully for opportunities to educate the workforce in these areas. Although the main knowledge areas of zero energy are sufficiently covered by courses involving sustainability, renewable energy, energy efficiency in buildings and infrastructure construction, the teaching of lean concepts are not widespread in all these education sectors in Australia.
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ItemOccupational stress and workplace design(MDPI AG, 2018-09-23)The World Green Building Council (WGBC) advocates improvements in employee health, wellbeing, and productivity in buildings as people are about 90% of an organisation’s expense and well exceed building costs and energy costs. It was reported that earlier research on workplace design primarily focused on physical arrangement of employees’ immediate work area, and ambient environmental qualities of the work area. Building organisation, exterior amenities, and site-planning have been given less attention. Therefore, we examine more closely the health relevance of both proximal and remote aspects of workplace design. Occupational stress is a complex phenomenon that is dynamic and evolving over time. This investigation reviews the existing fundamental conceptual models of occupational stress, workplace design, and connection to nature. It aims to develop an improved model relevant to work place design and occupational stress linked with connection to nature. The proposed improved model is presented with an appropriate causal loop diagram to assist in visualizing how different variables in a system are interrelated. The developed model highlights how connection to nature in workspaces can function as a work resource with a dual effect of improving physical wellbeing and psychological wellbeing.
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ItemComparison of multi-objective optimisation tools for building performance simulation with TRNSYS 18(IBPSA-England, 2018-09-11)Recent progress in computer science has led to applications of simulation-based optimisation methods for building design. This application-focused paper compares two generic optimisation tools: Multi-Objective Building Performance Optimisation (MOBO) and Design Analysis Kit for Optimisation and Terascale Applications (DAKOTA). The workflow and coupling of each tool with TRNSYS 18 software are presented. Results show that computing times were comparable, and both tools display similar optimal solutions. MOBO, specifically developed for building performance optimisation, is a user-friendly software, whereas DAKOTA requires a steep learning curve for non-programmers. Conversely, DAKOTA provides flexibility in interfacing the simulation software and defining the optimisation settings.