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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Fernando Illán-Gómez & José Ramón García-Cascales & Francisco Javier Sánchez-Velasco & Ramón A. Otón-Martínez, 2022. "Evaluation of the Use of Different Dedicated Mechanical Subcooling (DMS) Strategies in a Water Source Transcritical CO 2 Heat Pump for Space Heating Applications," Clean Technol., MDPI, vol. 4(4), pages 1-19, November.
    • Handle: RePEc:gam:jcltec:v:4:y:2022:i:4:p:74-1226:d:976226
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    References listed on IDEAS

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    1. Shen, Chao & Jiang, Yiqiang & Yao, Yang & Wang, Xinlei, 2012. "An experimental comparison of two heat exchangers used in wastewater source heat pump: A novel dry-expansion shell-and-tube evaporator versus a conventional immersed evaporator," Energy, Elsevier, vol. 47(1), pages 600-608.
    2. Ali Kahraman & Alaeddin Çelebi, 2009. "Investigation of the Performance of a Heat Pump Using Waste Water as a Heat Source," Energies, MDPI, vol. 2(3), pages 1-17, August.
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