热源与热汇对跨临界CO_2系统性能的影响  

Influence of the Source and Sink Temperatures on the Performance of ta Transcritical CO_2 System

作　　者：龚毅[1] 王哲[1] 吴学红[1] 张文慧[1] 吕彦力[1] 

机构地区：[1]郑州轻工业学院,河南郑州450002

出　　处：《流体机械》2013年第3期58-62,共5页Fluid Machinery

基　　金：国家十一五科技支撑计划项目(2006BAJ01A10-07)

摘　　要：跨临界CO2系统性能不仅受到排气压力的影响,而且对热源热汇温度的变化也十分敏感。介绍了具有双节流阀装置且带有平衡储液器的跨临界CO2制冷热泵试验台,并改变热源和热汇温度条件对系统进行了多工况对比性试验研究。结果表明:当热汇温度15℃一定,热源从15℃上升到25℃时系统制热COPH平均每5℃上升4.4%左右,反之热源温度25℃一定,热汇从15℃上升到25℃,系统制冷COP平均每5℃下降6.8%左右。且热源温度对冷冻水出水温度影响较大,而热汇温度对其影响较小,无论是热源或热汇温度平均每改变5℃对冷却水出口温度的影响范围在0.7℃到1.9℃左右。s： The performance of the CO2 trans-critical system is affected significantly not only by optimal system pressure but also by instantaneous ambient temperatures. The results of a study was carried out to elucidate the influence of the source and sink temperatures on the experimental research of a CO2 trans-critical refrigeration and heat pump system which used a new dual expansion valve and a balance CO2 liquid receiver adjustment device. The unit had been fully tested along a multistate experimental study, at various evaporating temperatures and different gas cooler outlet pressures. The results showed that：the source and sink temperatures rose from 15℃ to 25℃, trans-critical CO2 systems COPH average increase of 4, 4% each 5℃, but COP decrease of 6.8%. The influence of the source temperature on the chilled water outlet temperature which is less than the sink temperature. The effect of the source or sink temperature on the cooling water outlet temperature to average every 5℃ to change the range of from 0.7℃ to 1.9℃.

关 键 词：热源温度 热汇温度 CO2跨临界循环 试验研究 系统性能 

分 类 号：TH138.7[机械工程—机械制造及自动化] TB65[一般工业技术—制冷工程]