Theoretical study and performance comparison of different heat pump cycles using water as working fluid

被引：0

作者：

Wu D. ^{[1
]}

Hu B. ^{[1
]}

Wang R. ^{[1
]}

Yu J. ^{[2
]}

Lin X. ^{[2
]}

Li Z. ^{[2
]}

机构：

[1] Shanghai Jiao Tong University Institute of Refrigeration and Cryogenic, Shanghai

[2] Shanghai Hanbell Precise Machinery Co. Ltd., Shanghai

来源：

Huagong Xuebao/CIESC Journal | 2021年 / 72卷

关键词：

Compressor; COP; Equation of state; Heat pump; System design; Water refrigerant;

D O I：

10.11949/0438-1157.20201468

中图分类号：

学科分类号：

摘要：

As the working fluid of heat pump systems, water has the advantages of cheap, safe, stable, no toxicity and no flammability. It is a promising working fluid in the application of heat pumps. To find and study the water vapor heat pump system cycle with the best performance, three water vapor heat pumps with different system cycles and auxiliary equipment (the single-stage system with water-injection, the single-stage system with ejector, the two-stage system with internal heat exchanger) were designed and analyzed with simulation models. In the simulation, the twin-screw compressor was used as the power equipment in these systems. The simulation results indicated that compared with other systems, the two-stage system with internal heat exchanger is the best choice and has the best system performance including the discharge superheat, heating capacity, power consumption and COP. The single-stage system with water-injection has better performance than the conventional cycle, especially it can effectively decrease the discharge superheat. At 80℃ evaporation temperature and 140℃ condensation temperature, COP of the conventional cycle was 3.01. Meanwhile, COP of the single-stage system with water-injection and the two-stage system with internal heat exchanger was 3.15 and 4.07, which are 4.7% and 35.2% higher than that of the conventional cycle, respectively. For the single-stage system with ejector, it has better COP than the conventional cycle at high condensation temperature conditions with higher temperature lift. At 80℃ evaporation temperature and 145℃ condensation temperature, COP of the single-stage system with ejector was 2.53, which is higher than COP of the conventional cycle, 2.42. So it is also a good choice for high temperature lift conditions when used in water vapor heat pumps. © 2021, Editorial Board of CIESC Journal. All right reserved.

引用

页码：236 / 243

页数：7

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