The quality of outdoor space is becoming increasingly important with the growing rate of urbanization.Visual,acoustic,and thermal balance degradation are all negative impacts associated with outdoor comfort in dense u...The quality of outdoor space is becoming increasingly important with the growing rate of urbanization.Visual,acoustic,and thermal balance degradation are all negative impacts associated with outdoor comfort in dense urban fabrics.Urban morphology thus needs assessment and optimization to ensure favorable outdoor thermal comfort(OTC).This study aims to evaluate the thermal performance of streets in residential zones of Liverpool,NSW,Australia,and tries to improve their comfort index(Physiological Equivalent Temperature)to reveal optimum urban configurations.This evaluation is done by investigating the following urban design factors affecting OTC using computational simulation techniques:street orientation,aspect ratio,building typology,and surface coverage.Our findings reveal that street canyon orientation is the most influential factor(46.42%),followed by aspect ratio(30.59%).Among the influential meteorological parameters(air temperature,wind speed,humidity and solar radiation),wind velocity had the most significant impact on the thermal comfort of the outdoor spaces in this coastal region,which typically experiences intense airflow.The results of our analysis can be utilized by multiple stakeholders,allowing them to understand and extract the most vital design factors which contextually influence the thermal comfort of outdoor spaces.Outdoor thermal comfort has a direct effect on the health and wellbeing of occupants of outdoor spaces.展开更多
Climate change within the urban contexts is a crisis that cities are confronting globally.This issue poses numerous negative consequences such as thermal discomfort and increased energy usage within the building secto...Climate change within the urban contexts is a crisis that cities are confronting globally.This issue poses numerous negative consequences such as thermal discomfort and increased energy usage within the building sector.This is especially the case in Western Sydney,Australia,where the average maximum temperature has risen by 7—8℃ within the past 30 years.This increase in temperature is highly concerning,since this region is witnessing rapid urban and infrastructural development and is proposed as the third-largest economy of Australia.Temperature changes in this region will also result in considerably increasing the electricity used for cooling purposes.This paper presents a parametric approach driven multi-objective optimization methodology to discover optimum design solution based on the urban microclimate and cooling energy demand of multi-functional buildings within this urban context.Mitigation measures including a range of design factors at both building(typology and window to wall ratio)and urban scales(aspect ratio and urban grid rotation)are further suggested for developing context sensitive optimum urban layouts.The resultant solutions indicate an improvement in urban thermal comfort,cooling and heating energy use by up to 25.85%,72.76%,and 93.67%,respectively.展开更多
基金Each of the authors has substantially contributed to conducting the underlying research.Nastaran Abdollahzadeh conceived the study and was responsible for writing-original draft,software,methodology,data collection and analysis.Dr.Nimish Biloria was responsible for supervision,methodology,data curation and interpretation,review and editing.
文摘The quality of outdoor space is becoming increasingly important with the growing rate of urbanization.Visual,acoustic,and thermal balance degradation are all negative impacts associated with outdoor comfort in dense urban fabrics.Urban morphology thus needs assessment and optimization to ensure favorable outdoor thermal comfort(OTC).This study aims to evaluate the thermal performance of streets in residential zones of Liverpool,NSW,Australia,and tries to improve their comfort index(Physiological Equivalent Temperature)to reveal optimum urban configurations.This evaluation is done by investigating the following urban design factors affecting OTC using computational simulation techniques:street orientation,aspect ratio,building typology,and surface coverage.Our findings reveal that street canyon orientation is the most influential factor(46.42%),followed by aspect ratio(30.59%).Among the influential meteorological parameters(air temperature,wind speed,humidity and solar radiation),wind velocity had the most significant impact on the thermal comfort of the outdoor spaces in this coastal region,which typically experiences intense airflow.The results of our analysis can be utilized by multiple stakeholders,allowing them to understand and extract the most vital design factors which contextually influence the thermal comfort of outdoor spaces.Outdoor thermal comfort has a direct effect on the health and wellbeing of occupants of outdoor spaces.
文摘Climate change within the urban contexts is a crisis that cities are confronting globally.This issue poses numerous negative consequences such as thermal discomfort and increased energy usage within the building sector.This is especially the case in Western Sydney,Australia,where the average maximum temperature has risen by 7—8℃ within the past 30 years.This increase in temperature is highly concerning,since this region is witnessing rapid urban and infrastructural development and is proposed as the third-largest economy of Australia.Temperature changes in this region will also result in considerably increasing the electricity used for cooling purposes.This paper presents a parametric approach driven multi-objective optimization methodology to discover optimum design solution based on the urban microclimate and cooling energy demand of multi-functional buildings within this urban context.Mitigation measures including a range of design factors at both building(typology and window to wall ratio)and urban scales(aspect ratio and urban grid rotation)are further suggested for developing context sensitive optimum urban layouts.The resultant solutions indicate an improvement in urban thermal comfort,cooling and heating energy use by up to 25.85%,72.76%,and 93.67%,respectively.
