Impact of an internal heat exchanger on a transcritical CO2 heat pump under optimal pressure conditions: Optimal-pressure performance of CO2 heat pump with IHX
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AuthorOtón Martínez, Ramón Antonio; Illán Gómez, Fernando; García Cascales, José Ramón; Sánchez Velasco, Francisco Javier; Haddouche, Mohammed Reda
Knowledge AreaMecánica de Fluidos
SponsorsThis work was supported by the Spanish Ministry of Economy, Industry and Competitiveness and the European Regional Development Fund through project ENE2017-83665-C2-2-P.
Realizado en/conUniversidad Politécnica de Cartagena
Bibliographic CitationRamón A. Otón-Martínez, Fernando Illán-Gómez, José R. García-Cascales, F.J.S. Velasco, M. Reda Haddouche, Impact of an internal heat exchanger on a transcritical CO2 heat pump under optimal pressure conditions: Optimal-pressure performance of CO2 heat pump with IHX, Applied Thermal Engineering, Volume 215, 2022, 118991, ISSN 1359-4311, https://doi.org/10.1016/j.applthermaleng.2022.118991.
KeywordsCO2 heat hump
Internal heat exchanger
Hot water generation
Transcritical R744 (CO2) heat pumps are a low-GWP high-efficiency alternative for domestic hot water generation and space heating. For high set-point temperatures, however, the COP drops and the optimum operating pressure increases. For this reason, the effect on system performance achieved by the inclusion of an Intermediate Heat Exchanger (IHX) is analyzed in depth. This is carried out by means of a numerical-experimental approach in which the effectiveness of the IHX and other characteristic parameters of the heat pump cycle are studied as a function of the IHX heat transfer area. The numerical modeling of the heat pump components is implemented for transient simulations of system heating-up process. Experimental tests with and without IHX are carried out with a water-to-water heat pump that feeds an accumulator tank, to assess its influence on the system’s COP and the electrical consumption. Simulations reveal that improving the efficiency of the IHX, by increasing the exchange area, ...
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