Windcatchers are used in building design as natural ventilation devices,providing fresh air supply and thermal comfort under suitable outdoor conditions.However,their performance is often constrained by environmental ...Windcatchers are used in building design as natural ventilation devices,providing fresh air supply and thermal comfort under suitable outdoor conditions.However,their performance is often constrained by environmental factors such as outdoor temperature,wind speed and direction.While passive or low-energy heating,cooling,and heat recovery devices have been integrated into conventional windcatcher designs,the impact of changing wind directions,which can render the windcatcher ineffective,is often not considered.Addressing this gap,this research builds upon a novel dual-channel windcatcher system.This system employs a rotary wind scoop to ensure a consistent fresh air supply and stale air exhaust,irrespective of wind direction and facilitates the integration of passive/low-energy technologies.Using a validated numerical computational fluid dynamics(CFD)model,the design of the proposed system was enhanced by incorporating technologies such as an anti-short-circuit device and wing walls,and modifications such as a larger wind scoop area and a redesigned wind cowl to increase the pressure differential between the inlet and outlet and reduce system friction.The modified windcatcher achieved a 28%improvement in ventilation rate and outperformed a conventional four-sided windcatcher of the same size by up to 58%.Furthermore,full-scale simulations of the building and windcatcher at varying heights were conducted under atmospheric boundary layer wind flow to provide a realistic assessment of the windcatcher’s performance.This research contributes to the development of more efficient windcatcher systems for further passive technology integrations,enhancing their viability as sustainable ventilation solutions.展开更多
Natural ventilation and cooling have played an essential role in providing comfort conditions.Windcatchers are passive cooling systems and one of the most familiar elements in Iranian architecture.They can significant...Natural ventilation and cooling have played an essential role in providing comfort conditions.Windcatchers are passive cooling systems and one of the most familiar elements in Iranian architecture.They can significantly influence on reduce cooling loads and supply the necessary ventilation rate of buildings.This paper aims at providing an in-depth review of the recent developments and applications of windcatchers in modern architecture.The efficiency of windcatcher is also discussed according to the windcatcher’s relevant parameters,i.e.,height,configuration,and cross-section.This comprehensive review reveals that these factors have significant impacts on the performance of windcatchers.It is also shown that a one-sided windcatcher is a better choice in regions with privileged wind direction.However,other types of it are better in regions with variable wind directions.Finally,windcatchers’potential for applying in the contemporary architecture and urban planning shown in the using windcatcher in contemporary buildings,windcatchers in the urban context,new designs,and new technologies of windcatchers sections.展开更多
文摘Windcatchers are used in building design as natural ventilation devices,providing fresh air supply and thermal comfort under suitable outdoor conditions.However,their performance is often constrained by environmental factors such as outdoor temperature,wind speed and direction.While passive or low-energy heating,cooling,and heat recovery devices have been integrated into conventional windcatcher designs,the impact of changing wind directions,which can render the windcatcher ineffective,is often not considered.Addressing this gap,this research builds upon a novel dual-channel windcatcher system.This system employs a rotary wind scoop to ensure a consistent fresh air supply and stale air exhaust,irrespective of wind direction and facilitates the integration of passive/low-energy technologies.Using a validated numerical computational fluid dynamics(CFD)model,the design of the proposed system was enhanced by incorporating technologies such as an anti-short-circuit device and wing walls,and modifications such as a larger wind scoop area and a redesigned wind cowl to increase the pressure differential between the inlet and outlet and reduce system friction.The modified windcatcher achieved a 28%improvement in ventilation rate and outperformed a conventional four-sided windcatcher of the same size by up to 58%.Furthermore,full-scale simulations of the building and windcatcher at varying heights were conducted under atmospheric boundary layer wind flow to provide a realistic assessment of the windcatcher’s performance.This research contributes to the development of more efficient windcatcher systems for further passive technology integrations,enhancing their viability as sustainable ventilation solutions.
文摘Natural ventilation and cooling have played an essential role in providing comfort conditions.Windcatchers are passive cooling systems and one of the most familiar elements in Iranian architecture.They can significantly influence on reduce cooling loads and supply the necessary ventilation rate of buildings.This paper aims at providing an in-depth review of the recent developments and applications of windcatchers in modern architecture.The efficiency of windcatcher is also discussed according to the windcatcher’s relevant parameters,i.e.,height,configuration,and cross-section.This comprehensive review reveals that these factors have significant impacts on the performance of windcatchers.It is also shown that a one-sided windcatcher is a better choice in regions with privileged wind direction.However,other types of it are better in regions with variable wind directions.Finally,windcatchers’potential for applying in the contemporary architecture and urban planning shown in the using windcatcher in contemporary buildings,windcatchers in the urban context,new designs,and new technologies of windcatchers sections.
