| 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。 |
| 关键词: 热泵 CO2跨临界 机械过冷 R1234yf 制热性能 热力学分析 |
| DOI： |
| Received:July 12, 2022Revised:September 17, 2022 |
| 基金项目:国家重点研发计划（2021YFF0306801，2021YFF0306805） |
|
| Performance Analysis of Transcritical CO2 and R1234yf High Temperature Heat Pump Water Heater at Low Ambient Temperature |
|
Zhang Ning1, Li Minxia1, Ma Yitai1, Dang Chaobin2, Wang Pai1, Wang Qifan1, Song Ruitao1, Qin Pengwei1
|
| (1.School of Mechanical Engineering, Tianjin University;2.School of Engineering, University of Fukui) |
| 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. |
| Key words: heat pump CO2 transcritical mechanical subcooling R1234yf heating performance thermodynamic analysis |
