Research on optimization of compressor frequency conversion control in transcritical heat pump system

Chenxu Wei, Yabin Guo, Yuduo Li, Yuhua Wang, Yaxin Liu, Congcong Du and Linhan Zhang

Energy, 2024, vol. 313, issue C

Abstract: In the construction industry with increasing energy consumption, transcritical carbon dioxide heat pumps have been widely used because of their energy saving and high efficiency. However, the effect of compressor frequency on system operating characteristics has not been fully elucidated, and there is no effective variable frequency control strategy. Based on the experimental platform for transcritical CO2 heat pumps, this study conducts an in-depth analysis of the influence of compressor frequency on the system performance and dynamic characteristics. It is found that with the increase in frequency, the discharge temperature and the heating performance can be improved. The system COP has a maximum value. The system exhibits a pronounced dynamic response to changes in frequency. In light of the experimental findings, a variable frequency control optimization strategy was proposed. The results show that the heating time of the circulating heating mode is reduced by 3.11 %, and the COP is increased by 6.35 %; the water temperature in the primary heating mode is increased by 2.47 %, and the COP is increased by 3.92 %. The optimized strategy can effectively facilitate the system's achievement of energy saving, high efficiency, and stability.

Keywords: CO2 heat pump system; Variable frequency control; Control optimization; Dynamic performance characteristics; Experimental study (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:313:y:2024:i:c:s036054422403706x

DOI: 10.1016/j.energy.2024.133928

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