涡旋制冷压缩机外部冷却的研究

为具有外冷结构的涡旋制冷压缩机的工作过程建立了热力学模型,并研制了实验室样机,该压缩机的冷却结构可以深入到样机内部,其冷却效果更好.在搭建的相关冷却水循环回路中对无水冷和不同进口水温下的性能参数进行了测试,结果表明:相对于无水冷的工况,当进口水温为25℃时,输入功和排气温度分别降低了11.9%和36%,制冷量和容积效率分别提高了11%和12.7%,系统的制冷系数COP提高了26.2%;对于有水冷的工况,当进水温度从55℃降低到15℃时,系统的COP约提高1.5%,排气温度从86℃降低到64℃,降低了22℃,水和压缩机的换热量从1 261W升高到2 507W,提高了1 246W.模拟结果与实验结果吻合良好.

Research on Scroll Refrigeration Compressor with External Cooling

The working process of a scroll refrigeration compressor with special external cooling structure was studied.With the structure,the cooling fluid can flow into the prototype head and cool the compression chamber effectively.A thermodynamic model was established to simulate the scroll compressor with external cooling.The prototype was fabricated and the cooling water loop was built.Then the prototype was tested with and without the water cooling.The results show that the water cooling can improve the performance of the compressor significantly.Compared with the operation condition without water cooling,the power input and the discharge temperature decrease by 11.9% and 36%,respectively,the cooling capacity and the volumetric efficiency increase by 11% and 12.7% respectively,and the system COP(coefficient of performance) increases by 26.2% when the inlet water temperature is 25 ℃.For the compressor with special external cooling structure,when the inlet water temperature decreases from 55 ℃ to 15 ℃,the COP of the system increases by about 1.5%,but the discharge temperature drops from 86 ℃ to 64 ℃ and the heat transfer between the water and the compressor rises from 1 261 W to 2 507 W.The simulation results agree well with the experimental data.