热压自然通风房间围护结构对热分层影响的试验研究Experimental Investigation of Thermal Stratification Affected by Stack Ventilation Building Envelope
王磊,高军,赵加宁
WANG Lei1,GAO Jun2,ZHAO Jia-ning3(1.Northeast Dianli University
摘要(Abstract)：
热压自然通风房间内,当温度场稳定时形成清晰的二区热力分层,这一现象可以通过盐水模型试验观测到。但该试验所反映的热分层现象是在墙体绝热条件下的,而实际的建筑围护结构传热是不可忽略的,空气与壁面的对流换热必然会影响室内的温度分布。本文针对含有墙体传热和太阳辐射作用的情况,建立了以空气为介质的热浮力试验台,通过对室内温度场的测试分析表明,热分层现象与墙体传热能力密切相关。若室内热量向室外传递,则会削弱分层效果,二区向多区变化;若室外热量向室内传递,则会增大分层界面的温度梯度,同时分界面的高度降低。
In a stack ventilation room,two-layer stratification can be observed and proved by a scaled-down salt-bath model experiment.But this experiment is so confined and unrealistic that it can only simulate building with adiabatic envelope.In a real building,heat transfer through envelope can't be neglected.In this paper,experiments were carried out aiming at study the thermal stratification affected by envelope heat transfer.Results showed that thermal stratification had a close relation with heat transfer through the envelopes.If heat is transferred from inside to outside,the temperature gradient at the stratification interface can be weaken,multi-layer stratification can be observed;If heat is transferred from outside to inside,the height of the interface will descend and the temperature gradient at the stratification interface can be strengthen.
关键词(KeyWords)：
自然通风;试验;围护结构;热分层
natural ventilation;experiment;building envelope;thermal stratification
基金项目(Foundation):
作者(Author):
王磊,高军,赵加宁
WANG Lei1,GAO Jun2,ZHAO Jia-ning3(1.Northeast Dianli University
参考文献(References)：
- [1]龚光彩,李红祥,李玉国.自然通风的应用与研究[J].暖通空调,2003,(4):4-6.
- [2]王磊,高军,赵加宁.采用盐水模型实验法研究自然通风[J].建筑热能通风空调,2007,26(5):20-24.
- [3]Zerihun Desta T,Van Brecht A,Quanten S,et al.Modelling and control of heat transfer phenomena in-side a ventilated air space[J].Energy and Buildings,2005,37:777?786.
- [4]Ziskind G,Dubovsky V,letan R.Ventilation by natu-ral convection of a one-story building[J].Energy andBuildings,2002,34:91-102.
- [5]Chen Z D,Bandopadhayay P,Halldorsson J,et al.Anexperimental investigation of a solar chimney modelwith uniform wall heat flux[J].Building and Environ-ment,2003,38:893-906.
- [6]Oca J,Montero J I,Ant n A,et al.A Method forStudying Natural Ventilation by Thermal Effects in aTunnel Greenhouse using Laboratory-Scale Models[J].J.Agric.Engng Res,1999,72:93-104.