蒸气压缩式制冷循环的最佳冷凝温度

The Best Condensing Temperature of Vapor Compression Refrigeration Cycle

摘要: 冷凝温度降低则制冷机制冷系数提高，这是制冷机热工分析的结论。冷凝温度随自然环境温度降低而降低，自然环境温度又随季节、昼夜变化而变化，因此，多数人认为，环境温度下降必然使制冷机制冷系数提高。然而，实践中发现，当环境温度引起冷凝温度下降时，开始阶段，制冷机的制冷系数不断提高，但冷凝温度下降到一定程度后，制冷机的制冷效果却开始下降，可见，制冷机存在着最佳冷凝温度。本文就这一现象进行了理论分析，并计算出了R22单级蒸气压缩基本理论制冷循环的最佳冷凝温度值。

Abstract: When the condensing temperature decreases, the refrigeration coefficient of refrigerator increases, which is the conclusion of the thermal-technical analysis on the refrigerator. The condensing temperature decreases with the decreasing of the natural environment temperature, while the natural environment temperature varies along with the seasonal variation and day-night variation. Therefore, many consider that the drop of environment temperature would inevitably increase the refrigeration coefficient of the refrigerator. However, hands-on experience proves that when the environment temperature causes the decrease of condensing temperature, in the early stages, the refrigeration coefficient of the refrigerator will increase continually. But after the condensing temperature drops to a certain degree, the refrigeration effect of the refrigerator will decrease instead. It is thus clear that there exists the best condensing temperature of refrigerator. This paper conducts theoretical analysis aimed at this phenomenon and calculates the best condensing temperature value of the vapor compression refrigeration cycle on the basis of R22 single stage compression basic theory.