油循环率对补气式涡旋压缩机性能影响的试验研究

Experimental research on the effect of oil circulation rate on performance of vapor-injection scroll compressor

为了探究油循环率的变化对补气式涡旋压缩机性能的影响,采用第二制冷剂量热器法搭建了测量补气式涡旋压缩机单体性能的试验台,通过试验得到了非补气和补气状态下压缩机性能参数随油循环率的变化情况。同时对2种制热试验工况下非补气涡旋压缩机容积效率随油循环率的变化情况进行试验研究及分析。结果表明,在各个补气压力状态下热泵系统的总制热量和制热COP随油循环率增加呈现先增后减的趋势,油循环率在5.5%左右时制热COP达到峰值;相较于非补气状态,补气压力0.35 MPa工况下的系统制热量和制热COP分别提升了5.7%,2.0%;在所测工况下压缩机出口排气温度随含油量的增加明显下降。

In order to investigate the influence of oil circulation rate on the performance of vapor-injection scroll compressor,a test bench using the secondary calorimeter method was established to measure the heating performance of a single vapor-injection scroll compressor.Through experiments,the change of performance parameters of the compressor with oil circulation rates were obtained under vapor injection and non-vapor injection conditions.The changes of volumetric efficiency of the compressor without vapor injection with oil circulation rates under two heating experimental conditions were experimentally studied and analyzed.The results show that both the total heating capacity and COP of the heat pump system increase first and then decrease with the increase of oil circulation rate,and the COP reaches the peak when the oil circulation rate is about 5.5%.Compared with the condition without vapor injection,the system heating capacity and COP under the injection pressure of 0.35 MPa are increased by 5.7%and 2.0%respectively.At the same time,the exhaust temperature of the compressor decreases obviously with the increase of the oil circulation rate under the measured working conditions.