【作者】 刘斌； 臧润清； 申江；

【Author】 LIU Bin, ZANG Runqing, SHEN Jiang (Department of Refrigerator&HVAC, Tianjin University of Commerce , Tianjin 300134, China)

【机构】 天津商学院制冷与空调工程系；

【摘要】 提高制冷系统的能源效率是一个重要研究内容。在有关(火用)理论的基础上,分析了利用高压工质能量可能提高的效率,对NH3系统最大可能提高的效率能达到60％。基于这种分析,讨论了一种利用高压工质能量系统的压缩功变化,提出了临界抽气效率的概念,并把这种概念运用在氨制冷系统中。通过计算,得出了氨制冷系统的最优抽气系数在2．22％,而临界抽气系数则随蒸发温度升高而减小,几乎不随冷凝温度变化而变化。更多还原

【Abstract】 Improving the energy efficiency of the refrigeration system is an important field to be studied. Based on the theory of exergy, the possible efficiency to be improved of the refrigeration system using the high pressure refrigerant was analyzed. For the refrigeration system using NH3 , the possibility would be 60%. According to this, the change of the energy consumed by the compressor of a refrigeration system using the high pressure refrigerant was discussed, and the concept of the critical coefficient of gas bleed was given up. By calculating, the optimum coefficient of gas bleed was 2. 22% in the system using NH3 , and the critical coefficient of gas bleed decreases with the increasing of the evaporating temperature without relations with the condensing temperature.更多还原