Performance analysis and operation optimization of air-to-water CO2 heat pump with phase change thermal storage
Performance analysis and operation optimization of air-to-water CO2 heat pump with phase change thermal storage
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相变蓄热空气水CO2热泵性能分析及运行优化
DOI：
10.1016/j.enbuild.2019.109738
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发表时间：
2020-02
影响因子：
6.7
通讯作者：
MingWang
中科院分区：
文献类型：
--
作者：
ZhihuaWang;GuichenLi;FenghaoWang;ZixuanLiu;MingWang
CO2热泵用于采暖时，回水温度过高导致节流损失过大，热泵机组效率低。为解决这一问题，提出了一种空气-水CO2热泵联合相变蓄热供暖系统，并对其可行性进行了分析。本文在前人研究的基础上，对组合系统进行了仿真分析，进一步分析和优化了组合系统的性能。首先，建立了组合系统的数学模型，并通过实验结果验证了模型的正确性。其次，讨论了环境温度、气体冷却器进水温度等关键参数对系统性能的影响，并建立了系统最佳排气压力关联式。结果表明，在进水温度为30 °C时，当环境温度从−23 °C升高到−5 °C时，CO2热泵机组的COP提高了13.3%。最后，针对不同工况，提出了组合系统的优化控制策略。这些结果为改进和优化组合系统的性能提供了依据，有助于其推广应用。
When CO2heat pump is used for space heating, the high return water temperature leads to excessive throttling loss and low efficiency of the heat pump unit. In order to solve this problem, an air-to-water CO2heat pump unit combined with phase change thermal storage for space heating was proposed and its feasibility has been analyzed. On the basis of previous research, a simulation analysis was conducted in this work to further analyze and optimize the performance of the combined system. Firstly, a mathematical model of the combined system was established, and the correctness of the model was verified by experimental results. Secondly, the influence of the key parameters, such as the ambient temperature, the inlet water temperature of gas cooler, on the system performance was discussed, and a correlation of the optimal discharge pressure for the system was developed. The results indicated that the COP of CO2heat pump unit increased by 13.3% when the ambient temperature rose from −23 °C to −5 °C at the inlet water temperature of 30 °C. Lastly, an optimized control strategy of the combined system was developed under the different operating modes. These results provided a basis in improving and optimizing the performance of the combined system and helping to promote its application.
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