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Performance of an improved dual temperature heat pump system.

Author(s) : GAO Y., YANG W.

Type of article: IJR article

Summary

Conventional heat pump systems are typically capable of providing hot water at a single temperature. However, in certain instances, a requirement for two temperatures of hot water may arise. In such scenarios, the conventional heat pump system may exhibit low energy utilization efficiency. In order to address this aspect, this paper proposes an improved dual temperature heat pump system (IDTHP) which provides the refrigerant at the required pressure to the low temperature condenser by utilizing an ejector. Furthermore, this paper employs the equal-area mixing ejector model to calculate the ejector components of IDTHP, thereby ensuring the proximity of the simulation results to the actual situation and optimizing the structure of the ejector. The performance of the conventional dual-temperature heat pump system (CDTHP) and the improved dual-temperature heat pump system (IDTHP) was analyzed using thermodynamic and economic performance analysis, with R1234yf utilized as the operating fluid. Simulation results show that IDTHP improves the heating coefficient of performance (COPh) by about 13.8 %-24.1 % and reduces operating costs by about 15.6 %-17 % compared to CDTHP. However, the exergy efficiency of the CDTHP was marginally higher than that of the IDTHP, with a difference of about 2.7 %. In conclusion, the improved dual-temperature heat pump system presented in this paper has a good performance and is able to control the temperatures of both condensers independently.

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Pages: 13 p.

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Details

  • Original title: Performance of an improved dual temperature heat pump system.
  • Record ID : 30034371
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 179
  • Publication date: 2025/11
  • DOI: http://dx.doi.org/https://doi.org/10.1016/j.ijrefrig.2025.07.021

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