| 摘要: |
| 为减少温室气体的排放并提升供暖系统性能，本文提出了基于引射器与集成机械过冷的跨临界CO2热泵供暖系统（EJ-IMS），构建其热力学模型，以系统COP为目标函数，对过冷度和排气压力进行优化，并对系统在不同气候区典型城市使用的冬季供暖性能进行评估。结果表明：EJ-IMS系统存在最大COP、最优过冷度和排气压力。EJ-IMS系统的最优过冷度比集成机械过冷系统（IMS）低26.44~39.21%，最优排气压力比基本系统（BASE）和带引射器系统（EJ）低0.27~9.37%。相比3种常规系统，EJ-IMS系统的COP和?效率分别提高6.09~37.74%和6.75~46.02%。EJ-IMS系统的供暖性能系数（HSPF）相对3种系统提高6.89~29.61%，其更适用于严寒地区。本文可为高效CO2供暖系统的构建提供理论参考。 |
| 关键词: 集成机械过冷 引射器 跨临界CO2 热泵 供暖 |
| DOI： |
| 投稿时间：2024-03-30 修订日期：2024-05-09
录用日期：2024-05-14 |
| 基金项目:国家重点研发计划项目（No.2021YFE0116100），国家自然科学基金（No.51806151） |
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| Performance Analysis of CO2 Heat Pump System Based on Ejector and Integrated Mechanical Subcooling |
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| Abstract: |
| To reduce greenhouse gas emissions and improve the performance of space heating system, a transcritical CO2 heat pump heating system based on ejector and integrated mechanical subcooling (EJ-IMS) is proposed. A thermodynamic model of the system is developed with COP (coefficient of performance) as the objective function, then the subcooling degree and discharge pressure is optimized. The winter heating performance of the system located in typical cities of different climate zones is evaluated. The results show that the EJ-IMS system has the maximum COP, optimum subcooling degree and discharge pressure. The optimum subcooling degree is 26.44~39.21% lower than the integrated mechanical subcooling system (IMS), while the optimum discharge pressure of the EJ-IMS system is 0.27~9.37% lower than the baseline system (BASE) and ejector system (EJ). The COP and exergy efficiency of the EJ-IMS system are 6.09~37.74% and 6.75~46.02% higher than the above 3 conventional systems. The heating seasonal performance factor (HSPF) of the EJ-IMS system is 6.89~29.61% higher compared with the 3 systems, which is more suitable to be used in cold regions. This study can provide theoretical references for the construction of efficient CO2 space heating systems. |
| Key words: integrated mechanical subcooling ejector transcritical CO2 heat pump space heating |
