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Experimental Investigation of the Improvement Potential of a Heat Pump Equipped with a Two-Phase Ejector.
- Source :
- Energies (19961073); Aug2023, Vol. 16 Issue 16, p5889, 19p
- Publication Year :
- 2023
-
Abstract
- In this paper, an experimental investigation of the performance improvement of a heat pump equipped with a two-phase ejector, called an "ejector–expansion heat pump (EEHP)", is proposed. The system performance of the EEHP is compared with that of a vapor-compression heat pump (VCHP). The improvement potential is determined and discussed. The heat pump test system based on a water-to-water heat pump that can experiment with both the EEHP and the VCHP is constructed. A two-phase ejector with a cooling load of up to 2500 W is installed for the experiment. The results show that the EEHP always produces a higher heating rate and COP<subscript>HP</subscript> than the VCHP under the specified working conditions. The heating COP<subscript>HP</subscript> is increased by 5.7–11.6% depending on the working conditions. It is also found that, under the same heat sink and heat source temperature, the EEHP can produce a lower compressor discharge temperature and a lower compressor pressure ratio than the VCHP. This is evidence that the two-phase ejector can provide the compressor with better working characteristics, which yields a longer compressor lifetime. It is demonstrated that the expansion pressure ratio is key to the performance of the EEHP. A larger expansion pressure ratio yields greater improvement potential when compared with the VCHP. [ABSTRACT FROM AUTHOR]
- Subjects :
- HEAT pumps
COOLING loads (Mechanical engineering)
HEAT sinks
LOW temperatures
Subjects
Details
- Language :
- English
- ISSN :
- 19961073
- Volume :
- 16
- Issue :
- 16
- Database :
- Complementary Index
- Journal :
- Energies (19961073)
- Publication Type :
- Academic Journal
- Accession number :
- 170746408
- Full Text :
- https://doi.org/10.3390/en16165889