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A comprehensive investigation on the effect of internal heat exchanger based on a novel evaluation method in the transcritical CO2 heat pump system

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  • Qin, Xiang
  • Wang, Dingbiao
  • Jin, Zunlong
  • Wang, Junlei
  • Zhang, Guojie
  • Li, Hang

Abstract

With the increasing demand for environmental protection, CO2, as a natural refrigerant, has always been environmentally friendly and safe, which makes transcritical CO2 heat pump system attract more attention. The internal heat exchanger is employed to improve the performance of transcritical CO2 heat pump system to match the traditional heat pump circulation system. In this work, two evaluation methods are proposed, one is the actual operation thermal effectiveness of internal heat exchanger, the other is the actual increase rate of COP. Compared with the experimental results, the conclusions can be extracted that the actual increase rate of COP can effectively evaluate the impact of the internal heat exchanger on system performance. In addition, this research deeply analyzes the influence of the internal heat exchanger on exergy efficiency. The results show that the internal heat exchanger greatly reduces the exergy efficiency under the discharge pressure of 7310 kPa and the ambient temperature of 15 °C, and the difference value between the system with and without internal heat exchanger reaches 39%. However, the influence of the internal heat exchanger on exergy efficiency decreases with the increase of discharge pressure and ambient temperature, the minimum difference value is only 0.1% at 11000 kPa and 30 °C.

Suggested Citation

  • Qin, Xiang & Wang, Dingbiao & Jin, Zunlong & Wang, Junlei & Zhang, Guojie & Li, Hang, 2021. "A comprehensive investigation on the effect of internal heat exchanger based on a novel evaluation method in the transcritical CO2 heat pump system," Renewable Energy, Elsevier, vol. 178(C), pages 574-586.
    • Handle: RePEc:eee:renene:v:178:y:2021:i:c:p:574-586
    DOI: 10.1016/j.renene.2021.06.082
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    References listed on IDEAS

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    1. Razzak, Shaikh Abdur & Ali, Saad Aldin M. & Hossain, Mohammad Mozahar & deLasa, Hugo, 2017. "Biological CO2 fixation with production of microalgae in wastewater – A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 76(C), pages 379-390.
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    4. Ivan Ignatkin & Sergey Kazantsev & Nikolay Shevkun & Dmitry Skorokhodov & Nikita Serov & Aleksei Alipichev & Vladimir Panchenko, 2023. "Developing and Testing the Air Cooling System of a Combined Climate Control Unit Used in Pig Farming," Agriculture, MDPI, vol. 13(2), pages 1-20, January.
    5. Wang, Haidan & Song, Yulong & Qiao, Yiyou & Li, Shengbo & Cao, Feng, 2022. "Rational assessment and selection of air source heat pump system operating with CO2 and R407C for electric bus," Renewable Energy, Elsevier, vol. 182(C), pages 86-101.
    6. 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.
    7. Aleksei Khimenko & Dmitry Tikhomirov & Stanislav Trunov & Aleksey Kuzmichev & Vadim Bolshev & Olga Shepovalova, 2022. "Electric Heating System with Thermal Storage Units and Ceiling Fans for Cattle-Breeding Farms," Agriculture, MDPI, vol. 12(11), pages 1-13, October.
    8. Zhao, Pan & Xu, Wenpan & Liu, Aijie & Wu, Wenze & Wang, Jiangfeng & Yan, Zhequan, 2022. "Performance evaluation of a renewable driven standalone combined power and water supply system with cascade electricity and heat storage," Renewable Energy, Elsevier, vol. 199(C), pages 1283-1299.

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