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Study on performance evaluation of CO2 heat pump system integrated with thermal energy storage for space heating

Journal Article


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Abstract


  • CO2 heat pumps have drawn a great deal of attention owing to their advantages of high efficiency and environmental friendly for heating water under low ambient temperature. However, the system performance is not desirable and shows a lower COP for space heating, especially for a radiator as heating terminal, due to the higher inlet water temperature at the gas cooler, which causes a large throttle loss when the refrigerant flow through the throttling device. To tackle this issue, a transcritical CO2 heat pump system integrated with thermal energy storage (TES) systems was developed in this paper. The heating performance of the proposed system was investigated using TRNSYS 17.0 based on a typical single family rural house located in Beijing, 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 (without TES) during the entire heating period. It has been proved that the proposed system showed a better performance for space heating with a radiator terminal at low ambient temperature.

UOW Authors


  •   Wang, Zhihua (external author)
  •   Zheng, Yuxin (external author)
  •   Wang, Fenghao (external author)
  •   Song, Mengjie (external author)
  •   Ma, Zhenjun

Publication Date


  • 2019

Citation


  • Wang, Z., Zheng, Y., Wang, F., Song, M. & Ma, Z. (2019). Study on performance evaluation of CO2 heat pump system integrated with thermal energy storage for space heating. Energy Procedia, 158 1380-1387.

Scopus Eid


  • 2-s2.0-85063859756

Ro Full-text Url


  • https://ro.uow.edu.au/cgi/viewcontent.cgi?article=3569&context=eispapers1

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/2560

Number Of Pages


  • 7

Start Page


  • 1380

End Page


  • 1387

Volume


  • 158

Place Of Publication


  • Netherlands

Abstract


  • CO2 heat pumps have drawn a great deal of attention owing to their advantages of high efficiency and environmental friendly for heating water under low ambient temperature. However, the system performance is not desirable and shows a lower COP for space heating, especially for a radiator as heating terminal, due to the higher inlet water temperature at the gas cooler, which causes a large throttle loss when the refrigerant flow through the throttling device. To tackle this issue, a transcritical CO2 heat pump system integrated with thermal energy storage (TES) systems was developed in this paper. The heating performance of the proposed system was investigated using TRNSYS 17.0 based on a typical single family rural house located in Beijing, 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 (without TES) during the entire heating period. It has been proved that the proposed system showed a better performance for space heating with a radiator terminal at low ambient temperature.

UOW Authors


  •   Wang, Zhihua (external author)
  •   Zheng, Yuxin (external author)
  •   Wang, Fenghao (external author)
  •   Song, Mengjie (external author)
  •   Ma, Zhenjun

Publication Date


  • 2019

Citation


  • Wang, Z., Zheng, Y., Wang, F., Song, M. & Ma, Z. (2019). Study on performance evaluation of CO2 heat pump system integrated with thermal energy storage for space heating. Energy Procedia, 158 1380-1387.

Scopus Eid


  • 2-s2.0-85063859756

Ro Full-text Url


  • https://ro.uow.edu.au/cgi/viewcontent.cgi?article=3569&context=eispapers1

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/2560

Number Of Pages


  • 7

Start Page


  • 1380

End Page


  • 1387

Volume


  • 158

Place Of Publication


  • Netherlands