Performance Analysis of CO2 Dual-temperature Evaporation Heat Pump System with an Ejector

Li Xiaoyan; Dai Baomin; Hua Xue; Liu Chen; Liu Shengchun

doi:10.3969/j.issn.0253-4339.2022.02.054

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Performance Analysis of CO2 Dual-temperature Evaporation Heat Pump System with an Ejector

更新时间：2024-07-18

- Performance Analysis of CO2 Dual-temperature Evaporation Heat Pump System with an Ejector
- Journal of Refrigeration Vol. 43, Issue 2, (2022)
- 作者机构：
  
  1. 生态环境部对外合作与交流中心
  2. 天津商业大学天津市制冷技术重点实验室
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0253-4339.2022.02.054
  CLC：
- Published：2022
- 稿件说明：
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Li Xiaoyan, Dai Baomin, Hua Xue, et al. Performance Analysis of CO2 Dual-temperature Evaporation Heat Pump System with an Ejector[J]. Journal of refrigeration, 2022, 43(2).
DOI：

Li Xiaoyan, Dai Baomin, Hua Xue, et al. Performance Analysis of CO2 Dual-temperature Evaporation Heat Pump System with an Ejector[J]. Journal of refrigeration, 2022, 43(2). DOI： 10.3969/j.issn.0253-4339.2022.02.054.

摘要

采用高效的热泵系统替代常规锅炉是实现“双碳”目标的有效措施。本文提出采用引射器实现双温蒸发的CO2热泵系统，以实现余热梯级利用和高效制热。通过窄点分析法，建立了基本CO2系统、CO2引射器系统、双温蒸发CO2引射系统的热力学模型，发现双温蒸发系统存在最优排气压力及最大COP。基于最优工况进行分析，结果表明：在热泵热水器名义工况下，双蒸发器系统COP最高达4.84，比基本CO2热泵系统提高了9.88%。双温蒸发过程可显著降低吸热过程中的换热不可逆损失，双温蒸发系统蒸发器侧的不可逆性能指数为1.51，比基本CO2和带有引射器的常规CO2系统降低了24.50%。

Abstract

Replacing conventional boilers with an efficient heat pump system is an effective solution to achieving “carbon peaking and carbon neutrality”. In this study

a CO2 heat pump system adopting an ejector to realize dual-temperature evaporation is proposed for cascade utilization of waste heat and high-efficiency heating. Thermodynamic models of the baseline CO2 system (Base)

conventional CO2 ejector system (Ej-Evap1)

and CO2 ejector system with dual-temperature evaporation (Ej-Evap2) are developed based on the pinch method. The maximum coefficient of performance (COP) is achieved at the optimum discharge pressure for the dual-temperature evaporation system. Under the optimum working conditions

the results show that the maximum COP of the Ej-Evap2 system under nominal conditions is 4.84

which is 9.88% higher than that of the base. Double-temperature evaporation can significantly reduce the heat transfer irreversibility loss in the heat absorption process. The irreversible performance index of Ej-Evap2 during the evaporator process is 1.51

which is 24.50% lower than that of the base and Ej-Evap1 systems.

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Related Institution

School of Chemical Engineering and Technology, Xi'an Jiaotong University

State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University

天津市丹华宏业制冷技术有限公司

天津商业大学天津市制冷技术重点实验室

Key Laboratory of Science and Technology on Space Energy Conversion, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences

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