Comparison of air-source heat pump water heater performance with transcritical cycle using CO2, R170 and R41 as refrigerant

doi:10.11949/0438-1157.20191137

Abstract

Abstract:

On the basis of an air-source heat pump water heater (ASHPWH) system, a thermodynamic model used to calculate system performance is developed. Then, the performances and exergy efficiencies of a transcritical cycle with CO₂, R170 and R41 are investigated and compared. The results indicate that the COP_heat and exergy efficiencies of R41 (R170) system are about 31.77% (4.9%) and 23.34% (3.6%) higher than that of CO₂system under the same condition. R41 and R170 also have obvious advantages in increasing the heating capacity. Moreover, the optimum high pressure of systemwith R41 (R170) is more than 35% (43%) lower compared to that with CO₂. So, besides CO₂, R41 and R170 are also promising refrigerants for an ASHPWH system.

Key words: ASHPWH, transcritical cycle, CO₂, R41, R170, performance, enthalpy, exergy

摘要：

基于一套空气源热泵热水器系统，首先建立了相关的热力学参数计算模型，之后将CO₂、R170和 R41这3种制冷剂分别应用于该系统，并对跨临界循环的热力学性能及效率进行计算，最后对各性能参数进行详细对比。研究结果表明：在同样的工况下对比COP_heat和效率，R41系统分别比CO₂系统提升了31.77%和23.34%，而R170系统则提升了4.9%和3.6%；R41和R170在提升系统制热量方面也具有明显的优势；R41和R170的系统最优运行高压也比CO₂系统分别降低了35%和43%。因此，除了CO₂外，R41和R170也是另外2种很有潜力的应用于跨临界循环的制冷剂。

关键词: 空气源热泵热水器, 跨临界循环, CO₂, R41, R170, 性能, 焓

CLC Number:

TB 657.9

Dong WANG, Yaru LIU, Zhuo CHEN, Zunli KOU, Yuehong LU. Comparison of air-source heat pump water heater performance with transcritical cycle using CO₂, R170 and R41 as refrigerant[J]. CIESC Journal, 2020, 71(S1): 51-56.

Figures/Tables 6

Fig.1 Schematic diagram of ASHPWH system

Fig.2 lgp-h diagram

Fig.3 Optimum high pressure versusTe and Tgc,o in CO2, R170 and R41 cycles

Fig.4 The maximum COPheatversusTe and Tgc,o in CO2, R170 and R41 cycles

Fig.5 Heating capacity per unit versusTe and Tgc,o in CO2, R170 and R41 cycles

Fig.6 System exergy efficiency versusTe and Tgc,o in CO2, R170 and R41 cycles

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Comparison of air-source heat pump water heater performance with transcritical cycle using CO₂, R170 and R41 as refrigerant

将CO₂、R170和R41应用于跨临界空气源热泵热水器系统的性能对比研究

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