论文部分内容阅读
通过建立模型,分析比较了CO_2跨临界双级压缩带节流阀与带高压膨胀机制冷循环的性能。结果表明:双级压缩CO_2跨临界带节流阀与带高压膨胀机制冷循环的最佳中间压力并不是高低压的几何平均值;在一定的气体冷却器出口温度下,双级压缩CO_2跨临界带高压膨胀机制冷循环有一个最佳高压侧排气压力,与带节流阀循环相比,其最大COP可提高10%,但高压侧压力超过最佳值后,高压膨胀机对系统COP的影响逐渐变得不明显;在双级压缩CO_2跨临界带高压膨胀机制冷系统优化设计过程中,中间冷却应采用完全冷却型式。
Through the establishment of the model, the performance of the CO_2 transcritical two-stage compression throttle valve and the refrigeration cycle with high-pressure expander was analyzed and compared. The results show that the optimal middle pressure of the two-stage compression CO_2 transcritical throttling valve and the refrigeration cycle with high-pressure expander is not the geometric mean of high and low pressure. Under certain gas cooler exit temperature, High-pressure expander refrigeration cycle has an optimal high-pressure exhaust pressure, compared with the throttle cycle, the maximum COP can be increased by 10%, but the high-pressure side pressure exceeds the optimal value, the high-pressure expander on the system COP The influence becomes gradually unobvious. During the optimization design of the refrigeration system of CO 2 transcritical CO 2 high pressure expander, the full cooling mode should be adopted for the intercooling.