高大厂房热压自然通风主导条件下排风扇局部降温特性
|
摘要
以高大工业厂房为研究对象,建立了房间热压自然通风的物理模型和数学模型,对排风扇在厂房内减低局部温度的效果进行了分析.首先,通过比较热压通风房间理论模型与CFD方法的结果,验证了扩展区域热压通风计算的准确性和可靠性.其次,对于单侧墙壁安有排风扇和排风速度对降低厂房局部温度的作用进行了系统的分析.结果表明,由于结构上的涡流作用,局部排风扇的存在不仅没有降低设备密集区的温度,反而使得局部的热气无法排除,增加了局部的平均温度.在足够高的排风速度下,位于屋顶的通风口出现气流回流,加剧了局部温升.
This paper establishes a physical model and mathematical model of natural ventilation room.Effects of exhaust fan in reducing the local temperature equipment intensive areas are analyzed.By comparing the result of the computational fluid dynamics(CFD)to that of theoretical model,the CFD method is proved accurate and reliable in the calculating thermal driven natural ventilation.Two exhaust fans are installed at sidewall.Effects of exhausting velocity on reducing the local temperature of equipment intensive area are analyzed.The results show that the exhaust fan cannot reduce air temperature at equipment intensive zone as a circulation is formed at that area.The back flow at the roof ventilator exacerbated this temperature rise when exhaust velocity is high enough.
This paper establishes a physical model and mathematical model of natural ventilation room.Effects of exhaust fan in reducing the local temperature equipment intensive areas are analyzed.By comparing the result of the computational fluid dynamics(CFD)to that of theoretical model,the CFD method is proved accurate and reliable in the calculating thermal driven natural ventilation.Two exhaust fans are installed at sidewall.Effects of exhausting velocity on reducing the local temperature of equipment intensive area are analyzed.The results show that the exhaust fan cannot reduce air temperature at equipment intensive zone as a circulation is formed at that area.The back flow at the roof ventilator exacerbated this temperature rise when exhaust velocity is high enough.
引文
[1]Awbi H B.Ventilation of Buildings[M].E&FNSpon,1991:313-317.
[2]隋学敏,官燕玲,李安桂.热源面积对室内热压自然通风的影响[J].建筑科学与工程学报,2007,24(2):80-85.Sui Xuemin,Guan Yanling,Li Angui.Influence of heating source area on thermal pressure natural ventilation in room[J].Journal of Architecture and Civil Engineering,2007,24(2):80-85.
[3]赵福云.室内空气多态模拟及对流反演[D].长沙:湖南大学,2008:9-13.Zhao Fuyun.Multiple solutions and inverse modelling of indoor air convection[D].Changsha:Hunan University,2008:9-13.
[4]官燕玲,李安桂.火力发电厂主厂房自然通风设计分析[J].热力发电,2004,33(8):75-79.Guan Yanling,Li Angui.Analysis of natural ventilation design of main plant of thermal power plant[J].Thermal Power Generation,2004,33(8):75-79.
[5]王印夫,万沐,原安琦,等.铝电解厂房自然通风CFD设计方法(传统建筑结构)[J].轻金属,2005,(12):65-69.Wang Yinfu,Wan Mu,Yuan Anqi,et al.CFD design method for the natural ventilation of aluminum reduction pot room(conventional architecture structure)[J].Light Metals,2005,(12):65-69.
[6]刘远禄.热压作用下高大工业厂房地道自然通风的实测分析及数值模拟研究[D].西安:西安建筑科技大学,2015.Liu Yuanlu.The measurement and numerical simulation of tall industrial plant in hot authentic tunnel ventilation[D].Xi’an:Xi’an University of Architecture and Technology,2015.
[7]高军,高甫生,赵加宁.采用“二区+CFD”模型研究点源自然通风及其羽流[J].暖通空调,2005,35(1):20-25.Gao Jun,Gao Fusheng,Zhao Jianing.Study on point heat source natural ventilation and its plumes with an integrated two-zone and CFD model[J].Heating Ventilating&Air Conditioning,2005,35(1):20-25.
[8]Connolly B Ashrae.Refrigeration handbook addresses insulation for refrigeration systems[J].Operations Research,1997,54(6):1128-1136.
[9]陶文铨.数值传热学[M].西安:西安交通大学出版社,2003:347-353Tao Wenquan.Numerical Heat Transfer[M].Xi’an:Xi’an Jiaotong University Press,2003:347-353.
[10]赵福云,汤广发,刘娣.通风空腔出流边界条件的多方位探讨[C]//全国暖通空调制冷2004年学术年会资料摘要集(2),2004.Zhao Fuyun,Tang Guangfa,Liu Di.The multi-azimuth discussion of flow boundary conditions of air cavity[C]//National HVAC Refrigeration 2004 Annual Conference Data Digest Set(2),2004.
[2]隋学敏,官燕玲,李安桂.热源面积对室内热压自然通风的影响[J].建筑科学与工程学报,2007,24(2):80-85.Sui Xuemin,Guan Yanling,Li Angui.Influence of heating source area on thermal pressure natural ventilation in room[J].Journal of Architecture and Civil Engineering,2007,24(2):80-85.
[3]赵福云.室内空气多态模拟及对流反演[D].长沙:湖南大学,2008:9-13.Zhao Fuyun.Multiple solutions and inverse modelling of indoor air convection[D].Changsha:Hunan University,2008:9-13.
[4]官燕玲,李安桂.火力发电厂主厂房自然通风设计分析[J].热力发电,2004,33(8):75-79.Guan Yanling,Li Angui.Analysis of natural ventilation design of main plant of thermal power plant[J].Thermal Power Generation,2004,33(8):75-79.
[5]王印夫,万沐,原安琦,等.铝电解厂房自然通风CFD设计方法(传统建筑结构)[J].轻金属,2005,(12):65-69.Wang Yinfu,Wan Mu,Yuan Anqi,et al.CFD design method for the natural ventilation of aluminum reduction pot room(conventional architecture structure)[J].Light Metals,2005,(12):65-69.
[6]刘远禄.热压作用下高大工业厂房地道自然通风的实测分析及数值模拟研究[D].西安:西安建筑科技大学,2015.Liu Yuanlu.The measurement and numerical simulation of tall industrial plant in hot authentic tunnel ventilation[D].Xi’an:Xi’an University of Architecture and Technology,2015.
[7]高军,高甫生,赵加宁.采用“二区+CFD”模型研究点源自然通风及其羽流[J].暖通空调,2005,35(1):20-25.Gao Jun,Gao Fusheng,Zhao Jianing.Study on point heat source natural ventilation and its plumes with an integrated two-zone and CFD model[J].Heating Ventilating&Air Conditioning,2005,35(1):20-25.
[8]Connolly B Ashrae.Refrigeration handbook addresses insulation for refrigeration systems[J].Operations Research,1997,54(6):1128-1136.
[9]陶文铨.数值传热学[M].西安:西安交通大学出版社,2003:347-353Tao Wenquan.Numerical Heat Transfer[M].Xi’an:Xi’an Jiaotong University Press,2003:347-353.
[10]赵福云,汤广发,刘娣.通风空腔出流边界条件的多方位探讨[C]//全国暖通空调制冷2004年学术年会资料摘要集(2),2004.Zhao Fuyun,Tang Guangfa,Liu Di.The multi-azimuth discussion of flow boundary conditions of air cavity[C]//National HVAC Refrigeration 2004 Annual Conference Data Digest Set(2),2004.