建筑热湿环境营造过程中换热网络的匹配特性分析

Match properties of heat exchange network in thermal-hygro environment building

对主动式空调系统中的换热网络进行研究,分析了匹配特性在显热传递和热湿传递过程中的影响。显热传递过程由于传热能力UA有限和两侧流体流量不匹配会造成损失,热湿传递过程的损失则是由传热传质能力有限、流量不匹配和参数不匹配3种因素共同造成的。流量匹配的条件是两侧流体的热容量相等,空气与水直接接触的热湿传递过程只有在饱和线上进行时才能实现参数匹配。利用解析方法得到热湿传递过程中的传热阻力、传湿阻力表达式,分析了传热传质能力有限、流量不匹配和参数不匹配对热阻、湿阻造成的影响。

Researches the heat exchange network of active air conditioning system,and analyses the influence of match properties in sensible heat transfer and heat and moisture transfer processes.Limited heat transfer capability and unmatched flow rate at both sides result in loss of sensible heat transfer capacity.The loss of heat and moisture transfer process arises from limited heat and mass transfer capability,unmatched flow rate and unmatched parameters.The condition for flow matching is equal thermal capacity of fluids in both sides and parameter matching can only be reached in air-water heat and moisture transfer process along the saturation line.Obtains the expressions of heat transfer resistance and moisture transfer resistance through analytic method.Analyses the influences of limited heat and mass transfer capability,unmatched flow rate and unmatched parameters on heat transfer resistance and moisture transfer resistance.