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Pressure boost thermochemical sorption heat pump cycle

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  • Gao, Peng
  • Shao, Liang-Liang
  • Zhang, Chun-Lu

Abstract

Drying is a common process in industries and usually discharges much waste heat. Heat pump is an energy efficient approach to upgrading waste heat to a higher drying temperature. In this paper, a novel pressure boost thermochemical sorption heat pump (TSHP) is proposed. Different from existing salt/ammonia heat pump cycles, a compressor is installed between two reactors to drive the cycle so that only one sorbent is needed in the cycle and the exothermic process becomes continuous. Thermodynamic analysis shows that when desorption and sorption temperatures are 70 °C and 120 °C, the COP (coefficient of performance) of the new cycle with working pair SrCl2/NH3 is 6.5, which is remarkably higher than that of conventional vapor compression heat pump (VCHP) cycle under same operating conditions. Furthermore, for higher temperature rise, a hybrid cascade heat pump cycle is proposed as well. The VCHP cycle with refrigerant R134a is selected as the low stage cycle, while the TSHP cycle with sorbent SrCl2 is chosen as the high stage cycle. For the evaporating temperature 30 °C and sorption temperature 120 °C, the cascade cycle COP is 2.4, relative to 2.0 COP of conventional vapor compression cascade heat pump cycle.

Suggested Citation

  • Gao, Peng & Shao, Liang-Liang & Zhang, Chun-Lu, 2019. "Pressure boost thermochemical sorption heat pump cycle," Energy, Elsevier, vol. 169(C), pages 1090-1100.
    • Handle: RePEc:eee:energy:v:169:y:2019:i:c:p:1090-1100
    DOI: 10.1016/j.energy.2018.12.119
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    References listed on IDEAS

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    1. Jiang, L. & Li, S. & Wang, R.Q. & Fan, Y.B. & Zhang, X.J. & Roskilly, A.P., 2021. "Performance analysis on a hybrid compression-assisted sorption thermal battery for seasonal heat storage in severe cold region," Renewable Energy, Elsevier, vol. 180(C), pages 398-409.
    2. Jiang, L. & Wang, R.Q. & Tao, X. & Roskilly, A.P., 2020. "A hybrid resorption-compression heat transformer for energy storage and upgrade with a large temperature lift," Applied Energy, Elsevier, vol. 280(C).
    3. Li, Wei & Markides, Christos N. & Zeng, Min & Peng, Jian, 2024. "4E evaluations of salt hydrate-based solar thermochemical heat transformer system used for domestic hot water production," Energy, Elsevier, vol. 286(C).
    4. 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.

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