| 摘要: |
| 针对CO2热泵系统螺旋套管式气冷器，基于MATLAB建立了仿真模型，采用单因素分析方法，研究进水温度、CO2压力和质量流量对气冷器换热量、火积耗散、?损失、?效率以及出水温度的影响。经实验验证，在进水温度为24.5~35.0 ℃、CO2压力为8.4~10.7 MPa、CO2质量流量为0.032 6~0.047 6 kg/s工况下，气冷器模型制热量与实验数据相比总体误差在±10%以内。模拟结果表明：相比进水温度和CO2质量流量，CO2压力对气冷器性能的影响更为显著，且存在最优压力。在进水温度为20 ℃、CO2进口温度为90 ℃工况下，当CO2压力为10 MPa时气冷器?效率最高，当CO2压力为11 MPa时气冷器换热量最大；当进水温度低于20 ℃时，CO2压力为10.5 MPa时出水温度最高。 |
| 关键词: CO2热泵 气冷器 换热量 火积耗散 㶲 |
| DOI： |
| 投稿时间：2021-09-13 修订日期：2022-01-11
|
| 基金项目:国家自然科学基金（21576245）资助项目 |
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| Thermodynamic Performance Analysis of Gas Cooler in CO2 Heat Pump Systems |
|
Zhang Peng1, Yao Qiufeng2, Yang Yushen1, Peng Xu1, Zhang Jian1, Wang Dingbiao1
|
| (1.School of Mechanical and Power Engineering, Zhengzhou University,Engineering Research Center for Energy Saving Technology and Equipment of Thermal Energy System, Ministry of Education;2.Zhejiang Chuangli Automotive Air Conditioner Co., Ltd.) |
| Abstract: |
| For the spiral tube gas cooler in a CO2 heat pump system, a simulation model was established in MATLAB. The effects of the inlet water temperature, CO2 pressure, and mass flow rate of the gas cooler heat transfer, entransy dissipation, exergy loss, exergy efficiency, and outlet water temperature were studied using a single factor analysis method. Compared to the experimental data, the overall error of the model was within ±10% when the inlet temperature was 24.5-35.0 ℃, the CO2 pressure was 8.4-10.7 MPa, and CO2 mass flow rate was 0.0326-0.0476 kg/s. Compared to the inlet water temperature and CO2 mass flow rate, CO2 pressure had considerable effects on the performance of the gas cooler, thereby causing the optimal pressure. At inlet water temperature of 20 ℃ and inlet refrigerant temperature of 90 ℃, the exergy efficiency of the gas cooler reached the peak when CO2 pressure was 10 MPa, and the heat transfer rate of the gas cooler was the highest when CO2 pressure was 11 MPa. When the inlet temperature was lower than 20 ℃ and the CO2 pressure was 10.5 MPa, the outlet water temperature was the highest. |
| Key words: CO2 heat pump gas cooler heat transfer rate entransy dissipation exergy |
