Performance Analysis of Transcritical CO2 and R1234yf High Temperature Heat Pump Water Heater at Low Ambient Temperature

Zhang Ning; Li Minxia; Ma Yitai; Dang Chaobin; Wang Pai; Wang Qifan; Song Ruitao; Qin Pengwei

doi:10.3969/j.issn.0253-4339.2023.04.085

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Performance Analysis of Transcritical CO2 and R1234yf High Temperature Heat Pump Water Heater at Low Ambient Temperature

更新时间：2024-07-18

- Performance Analysis of Transcritical CO2 and R1234yf High Temperature Heat Pump Water Heater at Low Ambient Temperature
- Journal of Refrigeration Vol. 44, Issue 4, (2023)
- 作者机构：
  
  1. 天津大学机械工程学院
  2. 福井大学工学系研究科
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0253-4339.2023.04.085
  CLC：
- Published：01 January 2023，
- 稿件说明：
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ZHANG NING, LI MINXIA, MA YITAI, et al. Performance Analysis of Transcritical CO2 and R1234yf High Temperature Heat Pump Water Heater at Low Ambient Temperature. [J]. Journal of refrigeration, 2023, 44(4).
DOI：

ZHANG NING, LI MINXIA, MA YITAI, et al. Performance Analysis of Transcritical CO2 and R1234yf High Temperature Heat Pump Water Heater at Low Ambient Temperature. [J]. Journal of refrigeration, 2023, 44(4). DOI： 10.3969/j.issn.0253-4339.2023.04.085.

摘要

热泵中采用环境友好型工质可以减少对臭氧层的破坏，在低环境温度的条件下，在已有热泵系统的基础上，可使用CO2跨临界循环，并采用机械过冷。基于此，本文提出了R1234yf/CO2机械过冷热泵系统（MSHPS）、CO2/R1234yf双气冷器机械过冷热泵系统（DMSHPS）和CO2双级压缩三气冷器热泵系统（TSCHPS）。通过建立热力学模型，对采用CO2和R1234yf的系统制热性能进行分析，通过最优排气压力、蒸发温度、冷凝温度、辅循环和主循环流量比等条件，对同一系统和不同系统间的性能进行分析。本文将R1234yf替换为R134a，对比MSHPS和DMSHPS中采用R1234yf和R134a的制热性能，结果表明： MSHPS和DMSHPS两个系统中R1234yf和R134a的制热性能基本相当。

Abstract

In heat pumps

the use of environmentally friendly refrigerants can reduce damage to the ozone layer. Under the condition of low ambient temperature

based on the existing heat pump system

the CO2 transcritical cycle and mechanical subcooling were adopted. An R1234yf/CO2 mechanical subcooling heat pump system (MSHPS)

a CO2/R1234yf double air cooler mechanical subcooling heat pump system (DMSHPS)

and a CO2 two-stage compression triple air cooler heat pump system (TSCHPS) are proposed in this study. By establishing a thermodynamic model

the heating performance of the system using CO2 and R1234yf was analyzed. Furthermore

the performance of different systems was analyzed through the optimal discharge pressure

evaporating temperature

condensing temperature

and flow rate ratio of the auxiliary cycle and main cycle. In this study

R1234yf was replaced with R134a; the heating performances of R1234yf and R134a in the MSHPS and DMSHPS were compared and found to be similar.

关键词

热泵CO2跨临界机械过冷R1234yf制热性能热力学分析

Keywords

heat pumpCO2 transcriticalmechanical subcoolingR1234yfheating performancethermodynamic analysis

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