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Investigation on the feasibility and performance of transcritical CO2 heat pump integrated with thermal energy storage for space heating

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  • Wang, Zhihua
  • Wang, Fenghao
  • Ma, Zhenjun
  • Lin, Wenye
  • Ren, Haoshan

Abstract

CO2 heat pumps have drawn a great deal of attention as an economic form of heating under low ambient temperature conditions. However, the system performance is not desirable and shows a lower COP due to the higher inlet water temperature at the gas cooler, which causes a higher refrigerant temperature at the exit of the gas cooler, leading to a large throttle loss when the refrigerant flow through the throttling device. To tackle this issue, a transcritical CO2 heat pump unit integrated with two thermal energy storage (TES) containing phase change materials (PCMs) is proposed in this paper. The objective of this work is to model and simulate the proposed system using TRNSYS based on a typical single family rural house in Beijing (typical cold climate conditions), China. The results showed that the heating capacity and energy consumption decreased by 21 and 24%, respectively, and the heating seasonal performance factor (HSPF) of the proposed system increased by 4% in comparison with the baseline system during the entire heating period. The simulation results demonstrated that TES is helpful to improve CO2 heat pump system performance and monthly energy saving ratio for space heating.

Suggested Citation

  • Wang, Zhihua & Wang, Fenghao & Ma, Zhenjun & Lin, Wenye & Ren, Haoshan, 2019. "Investigation on the feasibility and performance of transcritical CO2 heat pump integrated with thermal energy storage for space heating," Renewable Energy, Elsevier, vol. 134(C), pages 496-508.
    • Handle: RePEc:eee:renene:v:134:y:2019:i:c:p:496-508
    DOI: 10.1016/j.renene.2018.11.035
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    Cited by:

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    2. 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.
    3. Tomas Kropas & Giedrė Streckienė & Juozas Bielskus, 2021. "Experimental Investigation of Frost Formation Influence on an Air Source Heat Pump Evaporator," Energies, MDPI, vol. 14(18), pages 1-15, September.
    4. Haibin Cao & Peng Jiang & Ming Zeng, 2021. "A Novel Comprehensive Benefit Evaluation of IEGES Based on the TOPSIS Optimized by MEE Method," Energies, MDPI, vol. 14(3), pages 1-19, February.
    5. Zhihua Wang & Yujia Zhang & Fenghao Wang & Guichen Li & Kaiwen Xu, 2021. "Performance Optimization and Economic Evaluation of CO 2 Heat Pump Heating System Coupled with Thermal Energy Storage," Sustainability, MDPI, vol. 13(24), pages 1-22, December.
    6. Mikulčić, Hrvoje & Ridjan Skov, Iva & Dominković, Dominik Franjo & Wan Alwi, Sharifah Rafidah & Manan, Zainuddin Abdul & Tan, Raymond & Duić, Neven & Hidayah Mohamad, Siti Nur & Wang, Xuebin, 2019. "Flexible Carbon Capture and Utilization technologies in future energy systems and the utilization pathways of captured CO2," Renewable and Sustainable Energy Reviews, Elsevier, vol. 114(C), pages 1-1.
    7. Fran Torbarina & Kristian Lenic & Anica Trp, 2022. "Computational Model of Shell and Finned Tube Latent Thermal Energy Storage Developed as a New TRNSYS Type," Energies, MDPI, vol. 15(7), pages 1-26, March.
    8. Cheng, Ying & Liu, Mingbo & Chen, Honglin & Yang, Ziwei, 2021. "Optimization of multi-carrier energy system based on new operation mechanism modelling of power-to-gas integrated with CO2-based electrothermal energy storage," Energy, Elsevier, vol. 216(C).
    9. Narula, Kapil & de Oliveira Filho, Fleury & Villasmil, Willy & Patel, Martin K., 2020. "Simulation method for assessing hourly energy flows in district heating system with seasonal thermal energy storage," Renewable Energy, Elsevier, vol. 151(C), pages 1250-1268.

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    Keywords

    CO2 heat pump; TRNSYS; Simulation; Space heating; HSPF;
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