Evaluation of the Use of Different Dedicated Mechanical Subcooling (DMS) Strategies in a Water Source Transcritical CO 2 Heat Pump for Space Heating Applications

Fernando Illán-Gómez (), José Ramón García-Cascales, Francisco Javier Sánchez-Velasco and Ramón A. Otón-Martínez
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Fernando Illán-Gómez: Departamento de Ingeniería Térmica y de Fluidos, ETSII, Universidad Politécnica de Cartagena, C/Dr Fleming s/n, 30202 Cartagena, Murcia, Spain
José Ramón García-Cascales: Departamento de Ingeniería Térmica y de Fluidos, ETSII, Universidad Politécnica de Cartagena, C/Dr Fleming s/n, 30202 Cartagena, Murcia, Spain
Francisco Javier Sánchez-Velasco: Departamento de Ingeniería Térmica y de Fluidos, ETSII, Universidad Politécnica de Cartagena, C/Dr Fleming s/n, 30202 Cartagena, Murcia, Spain
Ramón A. Otón-Martínez: Departamento de Ingeniería y Técnicas Aplicadas, Centro Universitario de la Defensa en la Academia General del Aire, C/López Peña s/n, 30720 San Javier, Murcia, Spain

Clean Technol., 2022, vol. 4, issue 4, 1-19

Abstract: In this work we analyze numerically different design configurations to be used in a R1234yf DMS cycle coupled with a water source, transcritical CO 2 heat pump for heating applications in the building sector. Specifically, we study the temperature range proposed by a European standard for heating with inlet/outlet water temperatures of: 30 °C/35 °C, 40 °C/45 °C, 47 °C/55 °C and 55 °C/65 °C. Moreover, 25 °C/30 °C is also analyzed which is the range expected for indoor swimming pool water pool heating applications. A water inlet temperature of 10 °C at the evaporator was considered in all of the cases. Results show that depending on the coupling strategy between the DMS cycle and the CO 2 heat pump, optimal COP values obtained can vary up to 30% whereas the optimal operating pressure of the CO 2 cycle can vary up to 8%. A configuration based on splitting the water flow to be heated into the DMS condenser and the gas cooler in a system with IHX was the best option for all the temperature ranges studied. The improvement in the maximum COP values obtained with this configuration ranges between 5% (for swimming pool applications) and 25% (for space heating with 40 °C/45 °C) when compared with the base cycle depending on the water temperature range considered. When this configuration is not considered, the basic transcritical CO 2 with IHX and without DMS was found the best option.

Keywords: water heater; transcritical cycle; heat pump; CO 2; DMS (search for similar items in EconPapers)
JEL-codes: Q2 Q3 Q4 Q5 (search for similar items in EconPapers)
Date: 2022
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