空调系统中热湿处理过程的评价方法及应用

提出对热、湿处理过程进行单独评价的概念,并构建了相应评价指标。以某一次回风空调系统的典型夏季空气处理过程为例,在热力学极限意义上阐明了对热、湿处理进行单独评价的实施过程,计算结果表明该空气处理过程的显热效明显高于潜热效,潜热效低下的原因主要在于再热显热损和冷凝水损,因此从潜热效看,表冷器并不是一个节能的除湿设备,采用露点送风回热措施可以有效提高潜热效,结果表明在空调系统分析中采用热、湿独立评价可以更好地评价其利用表现并提出针对性措施。

Method and Application of Independent Exergy Evaluation of Temperature and Humidity Control in HVAC Systems

The conception of independent exergy evaluation of temperature and humidity control in HVAC systems is proposed with the corresponding evaluation indexes presented.This type of evaluation process is illustrated in an air conditioning system with primary return air from the view of thermodynamics.The results show that exergy efficiency of sensible heat is larger than that of latent heat.The reason lies in the fact that the destructions in reheat process and condensed water are very serious.It is concluded that the surface air cooler is not an energy-saving equipment in respect of exergy utilization,and the regeneration of the supply air stream at the state of dew point would improve its exergy efficiency of latent heat.The analysis indicates that this independent exergy evaluation is benefit for the exergy evaluation for HVAC systems,and it provides effective resolutions.