154.内部回热器对CO2 家用空调系统性能的影响.pdf

第25卷增刊 动力工程 2005年 10月 JOURNAL OF POWER ENGINEERING 内部回热器对CO 家用空调系统性能的影响 2 陶于兵，何雅玲，吴志根，陶文铨 （西安交通大学能源与动力工程学院，动力工程多相流国家重点实验室，西安，710049 ） 摘 要：对家用二氧化碳空调系统进行了设计计算，分析了在不同的压缩机的压比、吸气过热度，蒸发温 度，气体冷却器侧空气进口温度和速度条件下内部回热器的存在对提高系统COP 的影响。计算结果表明， 系统的COP 随压缩机压比的增加，先是逐渐增加，达到一个最大值后，再逐渐降低；当系统带有内部回热 器时，系统COP 随着压缩机吸气过热度的增加而增加，当系统没有内部回热器时，系统COP 随着压缩机 吸气过热度的增加而降低；随着气体冷却器侧空气进口温度的降低、流速的增加、蒸发温度的升高，系统 的COP 均逐渐增大。在计算的参数范围内，带有内部回热器的循环比没有内部回热器的循环的COP 提高 3 ％～20 ％，可见内部回热器对于提高二氧化碳超临界循环空调系统的性能有着重要的作用。 关键词：二氧化碳跨临界循环；内部回热器；数值模拟；热力性能分析 2 Air Conditioning System TAO Yu-bing, HE Ya-ling, WU Zhi-gen, TAO Wen-quan State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiao Tong University, Xi’an 710049 Abstract ：In order to analyze the performance of the CO residential air -condition system and the effect of the 2 inner heat exchanger on the CO system, a carbon dioxide trans -critical air-condition system was designed, a lot of 2 numerical simulations and performance analysis with or without inner heat exchanger were carried out at different compression ratios, charge temperatures, evaporating temperatures, air inlet temperatures and velocities of the gas cooler. The results show that the COP of the system increases with the compression ratio increasing until it reaches the maximum then it decreases. When the system includes a inner heat exchanger, COP increases with the increase of the charge temperature of compressor, but when the system does not include a inner heat exchanger, COP decreases. When the evaporating temperature increas