The recent significant rise in space cooling energy demand due to the massive use of air-conditioning systems has adversely changed buildings’energy use patterns globally.The updated energy technology perspectives hi...The recent significant rise in space cooling energy demand due to the massive use of air-conditioning systems has adversely changed buildings’energy use patterns globally.The updated energy technology perspectives highlight the need for innovative cooling systems to address this growing cooling demand.Phase change material embedded radiant chilled ceiling(PCM-RCC)has lately acquired popularity as they offer more efficient space cooling together with further demand-side flexibility.Recent advancements in PCM-RCC applications have increased the necessity for reliable simulation models to assist professionals in identifying improved designs and operating settings.In this study,a transient simulation model of PCM-RCC has been developed and validated using measured data in a full-scale test cabin equipped with newly developed PCM ceiling panels.This model,developed in the TRNSYS simulation studio,includes Type 399 that uses the Crank-Nicolson algorithm coupled with the enthalpy function to solve transient heat transfer in PCM ceiling panels.The developed model is validated in both free-running and active operation modes,and its quality is then evaluated using several validation metrics.The results obtained in multiple operating scenarios confirm that the model simulates the transient behaviour of the PCM-RCC system with an accuracy within±10%.Aided by this validated model,which offers the user detailed flexibilities in the system design and its associated operating schemas,PCM-RCC’s potentials regarding peak load shifting,energy savings,and enhanced thermal comfort can be investigated more reliably.展开更多
Green Building rating systems are the main vehicles for commercial application of ecologically sustainable design for buildings.Using less materials,modular design for deconstruction,long life structure,using recovera...Green Building rating systems are the main vehicles for commercial application of ecologically sustainable design for buildings.Using less materials,modular design for deconstruction,long life structure,using recoverable materials are emerging concepts to reduce environmental impacts and increase the resource and economic efficiency of buildings.It has been argued that because of recent emergence of these concepts,Green Building rating systems do not fairly recognise the environmental benefits gained.This paper quantifies the impacts of the building reuse concept on the environment and the Green Building rating system scores and compares this with the energy category.It was found that lifecycle embodied greenhouse gas emission of approximately 20 kg CO_(2)-e/m^(2)/annum could be saved,if 80%of the office building components(structure,façade,wall,floor and roof)were reused in Australia.A second finding was that the current BREEAM 2008 and LEED 2009 tools do not provide fair recognition of the potential lifecycle embodied greenhouse gas emission reduction of building reuse compared to operational greenhouse gas emission reduction.展开更多
文摘The recent significant rise in space cooling energy demand due to the massive use of air-conditioning systems has adversely changed buildings’energy use patterns globally.The updated energy technology perspectives highlight the need for innovative cooling systems to address this growing cooling demand.Phase change material embedded radiant chilled ceiling(PCM-RCC)has lately acquired popularity as they offer more efficient space cooling together with further demand-side flexibility.Recent advancements in PCM-RCC applications have increased the necessity for reliable simulation models to assist professionals in identifying improved designs and operating settings.In this study,a transient simulation model of PCM-RCC has been developed and validated using measured data in a full-scale test cabin equipped with newly developed PCM ceiling panels.This model,developed in the TRNSYS simulation studio,includes Type 399 that uses the Crank-Nicolson algorithm coupled with the enthalpy function to solve transient heat transfer in PCM ceiling panels.The developed model is validated in both free-running and active operation modes,and its quality is then evaluated using several validation metrics.The results obtained in multiple operating scenarios confirm that the model simulates the transient behaviour of the PCM-RCC system with an accuracy within±10%.Aided by this validated model,which offers the user detailed flexibilities in the system design and its associated operating schemas,PCM-RCC’s potentials regarding peak load shifting,energy savings,and enhanced thermal comfort can be investigated more reliably.
文摘Green Building rating systems are the main vehicles for commercial application of ecologically sustainable design for buildings.Using less materials,modular design for deconstruction,long life structure,using recoverable materials are emerging concepts to reduce environmental impacts and increase the resource and economic efficiency of buildings.It has been argued that because of recent emergence of these concepts,Green Building rating systems do not fairly recognise the environmental benefits gained.This paper quantifies the impacts of the building reuse concept on the environment and the Green Building rating system scores and compares this with the energy category.It was found that lifecycle embodied greenhouse gas emission of approximately 20 kg CO_(2)-e/m^(2)/annum could be saved,if 80%of the office building components(structure,façade,wall,floor and roof)were reused in Australia.A second finding was that the current BREEAM 2008 and LEED 2009 tools do not provide fair recognition of the potential lifecycle embodied greenhouse gas emission reduction of building reuse compared to operational greenhouse gas emission reduction.
