A correlation of optimal heat rejection pressures in transcritical carbon dioxide cycles
A correlation of optimal heat rejection pressures in transcritical carbon dioxide cycles
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DOI：
10.1016/s1359-4311(99)00070-8
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发表时间：
2000-06
影响因子：
6.4
通讯作者：
S. Liao;Tian-yang Zhao;A. Jakobsen
中科院分区：
文献类型：
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作者：
S. Liao;Tian-yang Zhao;A. Jakobsen
在这项工作中，循环模拟模型已被开发，以优化跨临界二氧化碳空调循环的性能系数（COP）。分析表明，跨临界CO2循环的COP随放热压力的变化呈非单调变化，在最佳放热压力处COP最大。结果表明，最佳排热压力的大小主要取决于气体冷却器出口温度、蒸发温度和压缩机性能。在循环模拟的基础上，得到了特定条件下最佳排热压力与相应参数的关联式。研究结果对跨临界CO2空调热泵系统的设计和控制具有重要意义
In this work, a cycle simulation model has been developed to optimize the coefficient of performance (COP) of transcritical carbon dioxide air-conditioning cycles. The analysis shows that the COP of the transcritical carbon dioxide cycle varies nonmonotonically with the heat rejection pressure; a maximum COP occurs at an optimal heat rejection pressure. It is further revealed that the values of the optimal heat rejection pressure mainly depend on the outlet temperature of the gas cooler, the evaporation temperature, and the performance of the compressor. Based on the cycle simulations, correlations of the optimal heat rejection pressure in terms of appropriate parameters are obtained for specific conditions. The results are of significance for the design and control of the transcritical carbon dioxide air-conditioning and heat pump systems