新型环保制冷剂系统性能研究

System performance of new environment-friendly refrigerants

为得到制冷系统不同参数以及回热器对新型环保制冷剂R1234yf,R1234ze,R152a,R448A,R290,R600a系统性能的影响,基于VapCyc建立有/无回热器两套仿真模型,并且通过试验验证了模型的正确性.仿真得到了分别选用上述6种制冷剂时,系统制冷量及制冷系数COP随过热度、环境温度、压缩机转速、冷凝器侧风量、蒸发器侧风量的变化规律.结果表明:制冷量随过热度、外界环境温度的升高而减小,随压缩机转速、冷凝器侧风量、蒸发器侧风量的增大而变大;COP随过热度、外界环境温度、冷凝器侧风量的增大而降低;随压缩机转速、蒸发器侧风量的增大而升高;相同工况下,制冷量的大小顺序为R448A,R290,R152a,R1234yf,R1234ze,R600a,COP大小顺序为R600a,R1234ze,R152a,R1234yf,R290,R448A;对于上述6种制冷剂系统,增加回热器对系统性能均是有益的,且系统制冷量及COP平均提高了10%,6%左右,并且对R600a系统性能提高最为有利.

To investigate the effects of system parameters and regenerator cycle on the performance of new refrigerants of R1234yf, R1234ze, R152a, R448A, R290 and R600,two simulation models with and without regenerator cycle were established based on VapCyc software,and the models were verified by experiments. With the six refrigerants, the effects of overheating temperature, ambient temperature, compressor speed, air volume of condenser side and evaporator side on system refrigeration capacity and COP variation were simulated. The results show that the refrigeration capacity is decreased with the increasing of overheating temperature and external ambient temperature, while the refrigeration capacity is increased with the increasing of compressor speed, air volume on the condenser side and air volume on the evaporator side. The COP is decreased with the increasing of overheating temperature, ambient temperature and air volume on the condenser side,while the COP is increased with the increasing of compressor speed and air volume on the evaporator side. Under the same operating conditions, the decreasing sequence of refrigerating capacity is from R448A, R290, R152a ,R1234yf, R1234ze to R600a, and the decreasing sequence of COP is from R600a, R1234ze , R152a , R1234yf , R290 to R448A. For the above six refrigerant systems, the regenerator cycle is beneficial to the system performance. The cooling capacity and the COP of the system are respectively increased by 10% and 6%, and it is the most advantageous to improve the performance of R600a system.