摘要
通过对空调工况下R134a和R22常用制冷工质的螺杆制冷压缩机带经济器后的机组性能提高情况进行了数值模拟计算。分析了压缩机补气口位置、经济器传热温差、冷凝器出口过冷度和工质类型对机组性能的影响。另外,对带经济器螺杆制冷循环系统进行试验测试,得到了普通单级螺杆循环与带经济器螺杆循环在空调工况下的制冷量、耗功、性能系数的数据,并与模拟计算的结果进行比较分析。结果表明:螺杆制冷循环系统增设经济器以后,系统性能在某补气位置存在最佳值;经济器的换热性能越高、冷凝器出口过冷度越小、蒸发温度越低,系统性能提高的程度就越好;以R134a为制冷工质的系统的性能系数增长率高于以R22为工质的情况。
The simulation was performed on the performance of a screw compressor system with an economizer using R134a and R22 under the air conditioning condition. The influence of the supply port location, the heat transfer temperature difference of the economizer, the refrigerant subcooling degree at the outlet of the condenser on the performance of the screw compressor system was analyzed. The test was conducted to obtain the data including refrigerating capacity, energy consumption, and the COP in the experiment on the performance of a screw compressor system with and without an economizer. The simulated results are reasonably consistent with the experimental data. The results indicate that the system performance had an optimal value at a certain supply port location for the screw compressor refrigeration system with an economizer. The system performance increased with an increase in heat transfer of the economizer, a decrease in the subcooling degree at the outlet of the condenser, and a drop in the evaporating temperature. In addition, the COP enhancement of the screw compressor refrigeration system with an economizer using R134a was greater than that using R22.
出处
《制冷学报》
CAS
CSCD
北大核心
2010年第4期35-38,56,共5页
Journal of Refrigeration
关键词
热工学
经济器
螺杆式压缩机
空调工况
制冷量
性能系数
Pyrology
Economizer
Screw compressor
Air conditioning condition
Refrigerating capacity
Coefficient of performance
