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Performance analysis of cascade multi-functional heat pump in summer season

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  • Boahen, Samuel
  • Anka, Selorm Kwaku
  • Lee, Kwang Ho
  • Choi, Jong Min

Abstract

The use of cascade multi-functional heat pumps to provide simultaneous cooling or heating, and hot water has become essential in recent times. This study analyzed the performance of a water-to-water cascade multi-functional heat pump according to the variation of heat source and heat sink temperatures in cooling mode, hot water mode and cooling hot water mode. The cooling-hot water cycle was optimized to produce the designed capacities of the cooling and hot water cycles by maintaining the compressor speed of the low stage (LS) cycle as that in the cooling mode and increasing compressor speed of the high stage (HS) cycle above that in the hot water mode. In cooling-hot water mode, capacity of the hot water cycle and hot water temperature increased by 14.8% and 1.1°C respectively, as the standard outdoor entering water temperature (OD EWT) increased by 15°C. Variation of OD EWT and indoor entering water temperature had similar effects on capacity of the cooling cycle in cooling mode and cooling-hot water mode. Moreover, capacity of the hot water cycle was more stable in cooling-hot water mode than in hot water mode according to variation of hot water heat exchanger entering water temperature (HW EWT).

Suggested Citation

  • Boahen, Samuel & Anka, Selorm Kwaku & Lee, Kwang Ho & Choi, Jong Min, 2021. "Performance analysis of cascade multi-functional heat pump in summer season," Renewable Energy, Elsevier, vol. 163(C), pages 1001-1011.
    • Handle: RePEc:eee:renene:v:163:y:2021:i:c:p:1001-1011
    DOI: 10.1016/j.renene.2020.09.036
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    References listed on IDEAS

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    1. Cho, Changyong & Min Choi, Jong, 2013. "Experimental investigation of a multi-function heat pump under various operating modes," Renewable Energy, Elsevier, vol. 54(C), pages 253-258.
    2. Samuel Boahen & Kwang Ho Lee & Jong Min Choi, 2019. "Refrigerant Charge Fault Detection and Diagnosis Algorithm for Water-to-Water Heat Pump Unit," Energies, MDPI, vol. 12(3), pages 1-25, February.
    3. Cai, Jingyong & Ji, Jie & Wang, Yunyun & Huang, Wenzhu, 2016. "Numerical simulation and experimental validation of indirect expansion solar-assisted multi-functional heat pump," Renewable Energy, Elsevier, vol. 93(C), pages 280-290.
    4. Samuel Boahen & Jong Min Choi, 2019. "A Study on the Performance of a Cascade Heat Pump for Generating Hot Water," Energies, MDPI, vol. 12(22), pages 1-20, November.
    5. 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.
    6. Yu Jin Nam & Xin Yang Gao & Sung Hoon Yoon & Kwang Ho Lee, 2015. "Study on the Performance of a Ground Source Heat Pump System Assisted by Solar Thermal Storage," Energies, MDPI, vol. 8(12), pages 1-17, November.
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    1. Wu, Jinxing & Sun, Shoujun & Song, Qinglu & Sun, Dandan & Wang, Dechang & Li, Jiaxu, 2023. "Energy, exergy, exergoeconomic and environmental (4E) analysis of cascade heat pump, recuperative heat pump and carbon dioxide heat pump with different temperature lifts," Renewable Energy, Elsevier, vol. 207(C), pages 407-421.

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