Globally,the building sector is responsible for 40%of energy use and 30%of GHG emissions.The greatest portion of the energy is used during the operational phase(use stage)of buildings.The building envelope,especially ...Globally,the building sector is responsible for 40%of energy use and 30%of GHG emissions.The greatest portion of the energy is used during the operational phase(use stage)of buildings.The building envelope,especially the glazed components,plays an important role in determining the energy requirement of buildings.These glazed parts of the building envelope exposed to direct solar radiation are most vulnerable to heat loss and gain.Heat loss and gain through the glazing material depend on glazing properties(U-value,SHGC,VT)and building energy use changes according to the properties of the glazing system.A variety of glazing types has been developed over recent decades that use the properties of the glass as a means of responding to environmental conditions.This study is carried out to identify the optimum glazing property for conserving energy in cooling dominant regions using an early design energy modeling tool.It was found that a low SHGC is the most important glazing property for reducing cooling energy consumption.SHGC of less than 0.3 is found useful.This study would help building industry professionals evaluate the best glazing property while selecting the glazing type.展开更多
The construction of fully glazed commercial building facades responsible for high energy consumption has become a common architectural practice worldwide irrespective of the climate.This paper presents the methodology...The construction of fully glazed commercial building facades responsible for high energy consumption has become a common architectural practice worldwide irrespective of the climate.This paper presents the methodology to optimize the Window to Wall Ratio(WWR)with and without daylight utilization to reduce energy consumption in office buildings for the climate of Lahore,Pakistan,using a simulation tool COMFEN.The impacts of solar heat and daylight entering through the building façade with reference to different WWR and orientation were explored for the selection of optimum WWR.The optimum WWR was selected on the basis of least energy consumption whilst achieving a threshold lighting level.When daylight is not utilized,the energy demand is minimized by the lowest possible WWR.With daylight utilization,energy demand is optimized by use of WWRs of 13%to 30%according to orientation.Optimum WWR with daylight utilization offered a more balanced solution.The methodology used in this study can be applied to any location around the world to find optimum WWR for any glazing type.展开更多
文摘Globally,the building sector is responsible for 40%of energy use and 30%of GHG emissions.The greatest portion of the energy is used during the operational phase(use stage)of buildings.The building envelope,especially the glazed components,plays an important role in determining the energy requirement of buildings.These glazed parts of the building envelope exposed to direct solar radiation are most vulnerable to heat loss and gain.Heat loss and gain through the glazing material depend on glazing properties(U-value,SHGC,VT)and building energy use changes according to the properties of the glazing system.A variety of glazing types has been developed over recent decades that use the properties of the glass as a means of responding to environmental conditions.This study is carried out to identify the optimum glazing property for conserving energy in cooling dominant regions using an early design energy modeling tool.It was found that a low SHGC is the most important glazing property for reducing cooling energy consumption.SHGC of less than 0.3 is found useful.This study would help building industry professionals evaluate the best glazing property while selecting the glazing type.
文摘The construction of fully glazed commercial building facades responsible for high energy consumption has become a common architectural practice worldwide irrespective of the climate.This paper presents the methodology to optimize the Window to Wall Ratio(WWR)with and without daylight utilization to reduce energy consumption in office buildings for the climate of Lahore,Pakistan,using a simulation tool COMFEN.The impacts of solar heat and daylight entering through the building façade with reference to different WWR and orientation were explored for the selection of optimum WWR.The optimum WWR was selected on the basis of least energy consumption whilst achieving a threshold lighting level.When daylight is not utilized,the energy demand is minimized by the lowest possible WWR.With daylight utilization,energy demand is optimized by use of WWRs of 13%to 30%according to orientation.Optimum WWR with daylight utilization offered a more balanced solution.The methodology used in this study can be applied to any location around the world to find optimum WWR for any glazing type.
