The performance of a new 100 kW single-stage CO2 piston compressor developed by Norwegian University of Science and Tech-nology and Sintef is investigated in this paper. The oil circulation, volumetric efficiency, and overall efficiency are tested as an overview of the compressor performance. Experimental results with a pressure-ratio range from 1. 9 to 4 under compressor revolutions of 1000 to 2500 r/min are reported. The results show that the highest oil circulation rate is 2. 84%, acquired with a pressure ratio of 2. 1 and a revo-lution of 2500 r/min, while the volumetric efficiency reaches a maximum value of 85. 8% as a pressure ratio of 1. 88 and revolution of 1000 r/min are reached. Optimum overall efficiencies of this compressor can be achieved in a pressure-ratio range from 1. 5 to 2. 5 and a compressor revolution near 1500 r/min. Specifically, the maximum value is obtained up to 79. 1% with a revolution of 1500 r/min and a pressure ratio of 2. 0. The fitted overall efficiency results are compared with the efficiency data from two commensurate products in a cata-log. This illustrates that the overall efficiency of the new compressor is about 11. 5% higher than the others when the pressure ratio ranges from 1. 5 to 3. 2.%本文在不同压力和转速工况下,对一台由挪威科技大学与Sintef联合研发的100 kW大功率单级活塞式CO2制冷压缩机进行了实验测试,得出压缩机效率、容积效率以及油循环率随压缩比和转速的变化曲线,以及效率最优时各参数的范围.结果表明:当压缩比为2.1、转速为2500 r/min时,油循环率达到最大值2.84%;当压缩比为1.88,转速为1000 r/min时,容积效率达到最大值85.8%;当压缩比为1.5~2.5,转速约为1500 r/min时,压缩机效率最优;当转速为1500 r/min,压缩比为2.0时,可达到最大值79.1%.针对压缩机效率的实验数据进行了数学拟合,并与两台同类压缩机的产品效率作对比分析,结果表明:大功率压缩机当压缩比为1.5~3.2时的效率比同类压缩机约高11.5%.
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