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Solar-assisted auto-cascade heat pump cycle with zeotropic mixture R32/R290 for small water heaters

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  • Lv, Xiaolong
  • Yan, Gang
  • Yu, Jianlin

Abstract

In this study, a novel solar-assisted auto-cascade heat pump cycle (SAHPC) operating with the zeotropic mixture of R32/R290 for small water heaters is proposed. In the SAHPC system, a cascade heat exchanger (CHEX) associated with a phase separator is used to achieve auto cascade cycle and enhance the overall system performance. The performances of the SAHPC are evaluated by using the developed mathematical model, and then compared with the conventional air-sourced heat pump cycle (CAHPC). Simulation results show the SAHPC has 4.23–9.85% and 4.37–9.68% improvements in COP and volumetric heating capacity compared with those of the CAHPC, respectively, under the same operating conditions. However, the improvement of performance of this novel cycle largely depends on the absorbing heat ratio and the zeotropic composition. It is expected that this new cycle will be beneficial to developing dual-source coupled heat pump applications.

Suggested Citation

  • Lv, Xiaolong & Yan, Gang & Yu, Jianlin, 2015. "Solar-assisted auto-cascade heat pump cycle with zeotropic mixture R32/R290 for small water heaters," Renewable Energy, Elsevier, vol. 76(C), pages 167-172.
    • Handle: RePEc:eee:renene:v:76:y:2015:i:c:p:167-172
    DOI: 10.1016/j.renene.2014.11.012
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    Cited by:

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    2. Mohanraj, M. & Belyayev, Ye. & Jayaraj, S. & Kaltayev, A., 2018. "Research and developments on solar assisted compression heat pump systems – A comprehensive review (Part A: Modeling and modifications)," Renewable and Sustainable Energy Reviews, Elsevier, vol. 83(C), pages 90-123.
    3. Zhang, Shaoliang & Liu, Shuli & Shen, Yongliang & Shukla, Ashish & Mazhar, Abdur Rehman & Chen, Tingsen, 2024. "Critical review of solar-assisted air source heat pump in China," Renewable and Sustainable Energy Reviews, Elsevier, vol. 193(C).
    4. Besagni, Giorgio & Croci, Lorenzo & Nesa, Riccardo & Molinaroli, Luca, 2019. "Field study of a novel solar-assisted dual-source multifunctional heat pump," Renewable Energy, Elsevier, vol. 132(C), pages 1185-1215.
    5. Palomba, Valeria & Dino, Giuseppe E. & Frazzica, Andrea, 2020. "Coupling sorption and compression chillers in hybrid cascade layout for efficient exploitation of renewables: Sizing, design and optimization," Renewable Energy, Elsevier, vol. 154(C), pages 11-28.

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