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Performance evaluation of a two-stage compression heat pump system for district heating using waste energy

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  • Kwon, Ohkyung
  • Cha, Dongan
  • Park, Chasik

Abstract

The present study investigated a two-stage compression heat pump system for district heating utilizing waste energy. An evaporator and condenser exhibit a large difference in temperature when hot water is produced for heating by a heat pump. With single-stage compression, this causes a dramatic drop in the compressor efficiency and lowers the system performance; so, in the present study, a two-stage compression heat pump system comprising an intercooler and flash tank was designed, and the performance characteristics under various operating conditions were tested. When the heat source temperature was raised from 10 °C to 30 °C, the COP (coefficient of performance) was improved by up to 22.6%. As the superheating at the low-stage compressor was increased from 2 °C to 11 °C, the refrigerant flow rate and heating capacity decreased by as much as 7.6% and 2.2%, respectively, but there was no major impact on the temperature of the hot water produced nor on the system performance. Controlling the frequency of the high-stage compressor to control the intermediate pressure resulted in the ability to improve performance by as much as 5.2% under identical heat source conditions.

Suggested Citation

  • Kwon, Ohkyung & Cha, Dongan & Park, Chasik, 2013. "Performance evaluation of a two-stage compression heat pump system for district heating using waste energy," Energy, Elsevier, vol. 57(C), pages 375-381.
    • Handle: RePEc:eee:energy:v:57:y:2013:i:c:p:375-381
    DOI: 10.1016/j.energy.2013.05.012
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    References listed on IDEAS

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    1. Yang, Jun Lan & Ma, Yi Tai & Liu, Sheng Chun, 2007. "Performance investigation of transcritical carbon dioxide two-stage compression cycle with expander," Energy, Elsevier, vol. 32(3), pages 237-245.
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    Cited by:

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    7. Lin, Ying & Fan, Yubin & Yu, Meng & Jiang, Long & Zhang, Xuejun, 2022. "Performance investigation on an air source heat pump system with latent heat thermal energy storage," Energy, Elsevier, vol. 239(PA).
    8. Fangtian Sun & Yonghua Xie & Svend Svendsen & Lin Fu, 2020. "New Low-Temperature Central Heating System Integrated with Industrial Exhausted Heat Using Distributed Electric Compression Heat Pumps for Higher Energy Efficiency," Energies, MDPI, vol. 13(24), pages 1-17, December.
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    10. Ibrahim, Oussama & Fardoun, Farouk & Younes, Rafic & Louahlia-Gualous, Hasna, 2014. "Air source heat pump water heater: Dynamic modeling, optimal energy management and mini-tubes condensers," Energy, Elsevier, vol. 64(C), pages 1102-1116.
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