冰蓄冷低温送风空调系统损因素分析

摘要

低温送风空调系统引进新型冰蓄冷设备，采用正丁烷作为制冷剂，制冷剂与水直接接触，换热更强烈且稳定。为了研究该系统相应损因素条件下的节能薄弱环节，实现系统性能优化，基于该系统及各表冷器分析模型，分析了热湿比、新风比、送风温差等损因素对系统效率和各表冷器损率的影响。结果表明：当热湿比变化时，处理二次混风的表冷器损率随之呈正比变化，其他表冷器损率及系统效率随之呈反比变化；当新风比变化时，处理新风的两级表冷器损率随之呈正比变化，其他表冷器损率及系统效率随之呈反比变化；当送风温差变化时，处理一次回风的表冷器损率随之呈正比变化，其他表冷器损率及系统效率随之呈反比变化。%An exergy analysis model was developed for a novel ice storage system with cold air distribution and its main surface air coolers.Based on this model,the influence of heat and humidity ratio,fresh air ratio and temperature difference between supply air and indoor air on the exergy efficiency of the system and the exergy loss rate of its surface air coolers was studied.Finally the important parameters for system optimization were identified.The simulation results show that the exergy loss rate of the surface air cooler for secondary mixed air is positively proportional to the variation of heat and humidity ratio,while it is inverse for the other;the exergy loss rate of the surface air coolers for fresh air is positively proportional to the variation of fresh air ratio,while it is opposite for the other;the exergy loss rate of the surface air cooler for primary mixed air is positively proportional to the variation of temperature difference between supply air and indoor air,while it is inverse for the other.