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Investigation on the performance potential of a novel heat pump water heater based on transcritical CO2 quasi-two-stage compression with ejector.

Author(s) : CUI X., LIU W., YANG Y.

Type of article: IJR article

Summary

Heat pump systems for domestic hot water preparation hold great promise under low-temperature conditions. To enhance heat pump system performance, this study proposes a transcritical CO₂ quasi-two-stage compression heat pump with an ejector (TCIEJ) and compares it with three other CO₂ heat pump cycles. Using Tianjin as a case study, models for energy saving, economic viability, and environmental protection were established to analyze the system’s practical application, with comparisons made against R410A heat pumps and electric water heaters. A hybrid evaluation model combining the analytic hierarchy process and entropy weight method was employed to optimize the weight distribution of evaluation indicators and assess the overall performance of the three types of water heaters. Results show that at ambient temperatures of -15–10 ◦ C, the TCIEJ system’s optimal COP was enhanced by 21.7 % and 37.2 % compared to CO₂ heat pumps with expanders and ejectors, respec tively. CO₂ heat pumps could save 80.4 % and 8.7 % of electricity annually compared to electric water heaters and R410A heat pumps. Additionally, CO₂ heat pump water heaters had the lowest pollutant emissions, approximately 80.4 % less than electric water heaters. While CO₂ heat pump systems have a slightly higher initial investment cost than R410A heat pumps and electric water heaters, they offer lower operating costs. In the comprehensive evaluation index, a 10 % reduction in the initial investment cost of the CO₂ heat pump would lead to optimal overall performance. These findings provide essential theoretical references for enhancing the per formance of the TCIEJ system.

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Pages: 16 p.

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Details

  • Original title: Investigation on the performance potential of a novel heat pump water heater based on transcritical CO2 quasi-two-stage compression with ejector.
  • Record ID : 30034490
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 181
  • Publication date: 2026/01
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2025.10.013

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