跨临界二氧化碳蒸气压缩/喷射制冷循环性能比较

本文从系统的COP、制冷量和有效能分析三个方面比较了跨临界CO2蒸气压缩／喷射循环、蒸气压缩／回热制冷循环和常规的蒸气压缩制冷循环的性能．结果表明,在本文研究工况下,喷射循环的性能系数最大值比回热循环高 18．6％,比常规循环高22．0％．喷射循环的制冷量比回热循环高8．2％,比常规循环高11．5％。有效能分析表明喷射循环极大地减小了节流损失,冷却放热损失和压缩损失也有相应的减少．

PERFORMANCE COMPARISON OF TRANS-CRITICAL CO2 VAPOR-COMPRESSION/EJECTION REFRIGERATION CYCLE

The performance of trans-critical CO2 vapor-compression/ejection refrigeration cycle, the trans-critical CO2 vapor-compression cycle with internal heat exchanger, and the conventional trans-critical CO2 vapor-compression cycle was compared in three aspects of COP, cooling capacity and available energy. It was found that for the working conditions studied in this paper, the maximum increase of COP of the trans-critical CO2 vapor-compression/ejection refrigeration cycle is up to 18.6% comparing with the trans-critical CO2 vapor-compression cycle with internal heat exchanger and 22.0% comparing with the conventional trans-critical CO2 vapor-compression cycle. The cooling capacity of the ejector expansion cycle is 8.2% better than that of the internal heat exchanger cycle and 11.5% better than that of the conventional cycle. An exergy analysis showed that the ejector expansion cycle greatly reduces the throttling losses. The exergy loss due to heat rejection and compression is also reduced.