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Modelling of a new thermal compressor for supercritical CO2 heat pump

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  • Ibsaine, Rabah
  • Joffroy, Jean-Marc
  • Stouffs, Pascal

Abstract

A new concept of thermal compressor has been designed by the boostHEAT company. This compressor uses thermal energy provided through the heater instead of mechanical energy to increase the pressure of the heat pump working fluid. The compressor is made up by the following parts: a cylinder with a displacer piston, a heater, a regenerator and a cooler. The heater is connected to the hot part of the cylinder on the one hand and to the regenerator on the other hand. The cooler is connected to the regenerator on the one hand and to the cold part of the cylinder on the other hand. The cold part of the cylinder is connected to the low pressure branch of the heat pump (evaporator) through an automatic inlet valve, and to the high pressure branch of the heat pump (gas cooler) through an automatic exhaust valve. The compressor is intended to replace the conventional mechanical compressor in a CO2 heat pump for the residential heating or combined heat and power market. The main feature of the system is that the working fluid of the thermal engine for compression is the same as the working fluid of the heat pump. The principle of the new thermal compressor and its advantages for heat pump application will be briefly presented. A model of the thermal compressor has been developed and validated. Modelling results related to the regenerator, the piston rod diameter, the size of the adiabatic dead volumes and the working fluid leaks in the annular gap between the cylinder liner and the piston are presented.

Suggested Citation

  • Ibsaine, Rabah & Joffroy, Jean-Marc & Stouffs, Pascal, 2016. "Modelling of a new thermal compressor for supercritical CO2 heat pump," Energy, Elsevier, vol. 117(P2), pages 530-539.
    • Handle: RePEc:eee:energy:v:117:y:2016:i:p2:p:530-539
    DOI: 10.1016/j.energy.2016.07.017
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    References listed on IDEAS

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    1. Austin, Brian T. & Sumathy, K., 2011. "Transcritical carbon dioxide heat pump systems: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(8), pages 4013-4029.
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    2. Rajib Uddin Rony & Huojun Yang & Sumathy Krishnan & Jongchul Song, 2019. "Recent Advances in Transcritical CO 2 (R744) Heat Pump System: A Review," Energies, MDPI, vol. 12(3), pages 1-35, January.

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    Keywords

    CO2; Heat pump; Thermal compressor;
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