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Assessment of the influence of the intermediate pressure on the optimal gas cooler pressure in a one-stage CO2 heat pump with gas bypass for hot water generation.
Number: pap. n. 1461
Author(s) : ILLÁN GÓMEZ F., GARCÍA-CASCALES J. R., SÁNCHEZ-VELASCO F. J., et al.
Summary
This work analyses the influence that the liquid receiver pressure has on the efficiency of a one-stage CO2 heat pump water heater with gas bypass. The paper begins with the description of the experimental facility developed for the tests of these kind of heat pumps and continues with a theoretical discussion of the influence that the liquid receiver pressure has in the system’s performance. Then the adjustment of the experimentally measured values of compressor power consumption and mass flow rate to typical AHRI correlations is presented. This adjustment is used in a simplified numerical model to assess the influence of the liquid receiver pressure in the system’s performance. The model is finally compared to experimentally measured values of COP. The results show that the efficiency of this kind of system is always lower than that of a similar system without gas bypass, although at low gas cooler outlet temperatures the influence of the liquid receiver pressure is almost negligible and the system’s efficiency is similar to that obtained without gas bypass.
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Details
- Original title: Assessment of the influence of the intermediate pressure on the optimal gas cooler pressure in a one-stage CO2 heat pump with gas bypass for hot water generation.
- Record ID : 30026534
- Languages: English
- Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
- Publication date: 2019/08/24
- DOI: http://dx.doi.org/10.18462/iir.icr.2019.1461
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Indexing
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Themes:
Heat pumps techniques;
CO2 - Keywords: Hot water; Gas cooler; R744; Heat pump; Modelling; Pressure; Energy efficiency; COP
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