Browsing by Author "Hyde, R"

Now showing 1 - 10 of 10

item: Article-Abstract
Barriers to and opportunities for advanced passive cooling in sub-tropical climates
Rajapaksha, RMKU; Hyde, R
The article explores the use of advanced passive cooling in the context of complex non-domestic buildings. Passive cooling involves a number of strategies and when one or more of these strategies are combined they create a more advanced form of passive cooling. In tropical and sub-tropical climates it is possible to use multiple passive strategies in combination to accommodate complex heat load issues with non-domestic buildings in maintaining thermal comfort and energy efficiency. A case study is used to redefine this concept and to explore the energy and comfort implications.
item: Conference-Abstract
A Design framework for achieving net zero energy commercial buildings
Hyde, R; Rajapaksha, RMKU; Rajapaksha, I; Riain, MO; Silva, F
Net Zero Energy Buildings (NZEB) are currently an emerging performance target for sustainable commercial buildings. A central issue is how this target can be met either through the design of new buildings or retrofitting of existing buildings. From a review of the NZEB definitions it is argued a new conceptualisation is needed which maps specific carbon abatement emissions for the components of the total energy system. The NZEB approach is examined in four projects. It is argued that retrofitting is needed to achieve reductions in global im pact in terms of CO2 but often the scope of work is beyond the owner’s capability, Hence, local, national and global ‘welfare’ (subsidies and incentives) are needed. Nation states in this study are responding differently to this welfare capacity by promoting or penalizing the NZEB building methodologies. More research is need to assess the level of welfare needed to support NZEB and to limit the environmental impacts of commercial buildings in line with GHG abatement targets.
item: Conference-Abstract
Developing a conceptual model for passive cooling in buildings in the tropics : a study of maritime museum, Galle, Sri Lanka
Rajapaksha, U; Gunasekara, A; Rajapaksha, I; Hyde, R
The paper presents an investigation of the performance of thermal mass and night ventilation for passive cooling using a critical case study approach. The conceptual Model is based on literature and a pre-modern building in a historic world heritage site. The building was tested by a field investigation using thermal monitoring and a simulation study of the building. Effectiveness is seen with internal air and operative temperatures moving 5-6 degrees C well below ambient levels which is around 31 degrees C, suggesting efficiency of thermal mass with night ventilation for passive cooling and in reducing needs for operational energy in warm humid climates. The work provides evidence supporting these findings and justifying the conceptual Model.
item: Conference-Abstract
Developing a framework of interventions for retrofitting high-rise office buildings in warm climates
Rajapaksha, RMKU; Hyde, R; Rajapaksha, I; Leifer, D
There is a complex interplay of issues associated with retrofitting high-rise office buildings in warm climates. This paper explores non-technological and technological interventions for retrofitting and the potential environmental benefits associated with them. An approach is developed in the context of bioclimatic renovation design for existing high-rise office buildings in warm climates in Australia that offers opportunities for promoting energy-efficient practices through the exploitation of occupant behaviour, building design and powered systems in the commercial building sector.
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Harnessing archaeological and architectural science knowledge for cultural sustainability
Lazer, E; Hayman, S; Hyde, R; Rajapaksha, I; Sartogo, F; Calderaro, v;
item: Conference-Abstract
A modelling appraisal of design standards in retrofitting a high-rise office building in Brisbane
Rajapaksha, I; Hyde, R; Rajapaksha, RMKU
This paper reports the testing of appropriate design standards to optimize energy performance in the pursuit of building retrofits. The impact of whole-building "best" and "normal" practice standards are predicted and evaluated using as a case study a forty-year-old heavy coredependent deep-plan twenty-three storey office building in Brisbane. Predictive modelling used Design Builder simulation software. A Forward Simulation Model (FSM) and Data-Driven Simulation Models (DDSM) contributed to the evaluation of "normal" and "best" practice standards. With higher thermal resistance in the built fabric the PassivHaus Model (PHM) – a “best” practice standard – demonstrated a maximum energy saving of 9.5%. Findings suggest that retrofitting for energy saving in internal-load dominated office buildings requires strategies to control internal loads. The holebuilding energy standards with efficient operational profiles promoted 46% of energy savings, showing systematic appraisal and prediction to derive case-specific design solutions in satisfying the regulatory measures for future commercial buildings in Australia.
item: Conference-Abstract
Passive modification of air temperature for thermal comfort in a courtyard building for Queensland
Rajapaksha, U; Hyde, R
The paper presents the effects of airflow access points on the passive modification of indoor air temperature in a partly roofed high-mass courtyard building found in moderate climate of southeast Queensland. Results of a field investigation reveal that despite sufficient shading within the courtyard, its air temperature and thus comfort levels depend greatly on the location of airflow access points in the building layout and section. Potential of courtyards for passive cooling (lowering of its air temperature than ambient) is seen when airflow access points for most frequent-easterly daytime summer breeze is integrated in immediate building microclimates where sufficient shading can be provided, in conjunction with nocturnal ventilation. Potential for passive heating (an elevation of courtyard air temperature above ambient) is seen if no airflow access points to the most frequent south-westerly winter breeze are integrated but sufficient solar gain from northeast is allowed through building section.
item: Conference-Abstract
Sustainable by passive architecture, using courtyards in non-domestic building in Southeast Queensland
Rajapaksha, U; Hyde, R
The paper presents results of a research arising from “Energy – Building” relationship in terms of sustainable development. The research emphasizes why and how energy conservation in building operation is achieved through “Passive Systems” using architectural design. The paper argues that passive design can minimize the use of active systems for indoor climate control and therefore contribute to mitigating greenhouse gas emission and addressing Global Warming. A courtyard building in this respect presents a greater flexibility in promoting larger areas of internal passive zones in buildings and therefore passive architecture. The research explores the potential of courtyards for passive climate control in non-domestic buildings in Queensland, Australia and proposes a theoretical design model.
item: Conference-Full-text
Sustainable retrofitting: a case study in research led teaching (RLT)
(2014-01-10) Hyde, R
The research work reported here describes a project concerning the proposed renovation and retrofitting of a bioclimatic tower in Malaysia though a three day colloquium and charette exercise with students and practitioners. Following the completion of this project it was found that many of the characteristic's of both the activities and the knowledge outcomes during and from this exercise are consistent with what could called a research-led teaching approach (RTL). The paper first defines research led teaching and then describes aspect of the approached used in the project, which have similarities with RTL. Conclusions from this analysis suggest that conventional research processes and methodologies can frame important questions for practice, however often these cannot be resolved easily though conventional methods of architectural SCIence research. RTL, which takes questions from the convention research process and explores these through design, offers a model for future architectural research.
item: Conference-Abstract
Towards an evidence base model for environmental retrofit- mapping solution sets for near carbon neutral buildings in warm climates
Rajapaksha, RMKU; Rajapaksha, I; Hyde, R
The paper presents an evidence base model for environmental retrofitting of an existing nondomestic buildings in warming climates. The model is grounded in bioclimatic design, and uses a four-phase methodology; mapping thermal load profiles, monitoring interventions for performance improvement with current and future climates and presenting evidence for future use. Thermal load characteristics, both externalities (climate and building design) and internalities (occupancy and equipment), which affect the heat load profiles and therefore energy performance of a building, are classified as areas for retrofitting. The model is used to demonstrates the solution sets needed to renovate a 23 storey high office building in Brisbane, to a nearly zerocarbon consumer, with 5 star NABERS greenhouse gas emission rating off set with renewable energy.