Optimal heat rejection pressure for transcritical CO2 refrigeration cycle with an expander

被引：6

作者：

Yang, Jun Lan ^{[1
]}

Ma, Yi Tai ^{[2
]}

Zhang, Jia Hui ^{[3
]}

机构：

[1] Tianjin Chengjian Univ, Sch Energy & Safety Engn, Tianjin 300384, Peoples R China

[2] Tianjin Univ, Thermal Energy Res Inst, Tianjin 300072, Peoples R China

[3] Siemens Ind Inc, R&D Dept, Pittsburgh, PA USA

来源：

INTERNATIONAL JOURNAL OF GREEN ENERGY | 2016年 / 13卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Expander; optimal heat rejection pressure; simulation; transcritical CO2 cycle;

D O I：

10.1080/15435075.2014.938339

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Heat rejection pressure plays an important role in designing a transcritical CO2 refrigeration system, and it has an optimal value to maximize the system's coefficient of performance (COP). With a thermodynamic simulation model, the optimal heat rejection pressure is studied in the paper for an expander cycle, as well as conventional throttle valve cycle. The effects of compressor efficiency, expander efficiency, gas cooler outlet temperature, and evaporation temperature on the optimal heat rejection pressure are analyzed. It is the first time for a transcritical CO2 expander cycle that the optimal heat rejection pressure is correlated with the gas cooler outlet temperature and the evaporation temperature at given compressor efficiency and expander efficiency. The average deviation from the correlation to simulation results is less than 1.0%. The correlation provides a guideline to system development and performance optimization of a transcritical CO2 expander cycle.

引用

页码：208 / 212

页数：5

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