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Numerical Study of Hydrocarbon Charge Reduction Methods in HVAC Heat Exchangers

Author

Listed:
  • Ehsan Allymehr

    (Department of Energy and Process Engineering, NTNU Norwegian University of Science and Technology, Kolbjørn Hejes vei 1D, 7491 Trondheim, Norway)

  • Geir Skaugen

    (SINTEF Energy Research, Kolbjørn Hejes vei 1, 7491 Trondheim, Norway)

  • Torsten Will

    (Fraunhofer Institute for Solar Energy Systems ISE, Heidenhofstr. 2, 79110 Freiburg, Germany)

  • Ángel Álvarez Pardiñas

    (SINTEF Energy Research, Kolbjørn Hejes vei 1, 7491 Trondheim, Norway)

  • Trygve Magne Eikevik

    (Department of Energy and Process Engineering, NTNU Norwegian University of Science and Technology, Kolbjørn Hejes vei 1D, 7491 Trondheim, Norway)

  • Armin Hafner

    (Department of Energy and Process Engineering, NTNU Norwegian University of Science and Technology, Kolbjørn Hejes vei 1D, 7491 Trondheim, Norway)

  • Lena Schnabel

    (Fraunhofer Institute for Solar Energy Systems ISE, Heidenhofstr. 2, 79110 Freiburg, Germany)

Abstract

Required refrigerant charge in heat pump systems with propane is analyzed. Two systems are compared: the first a direct heat pump, with fin-and-tube heat exchangers, and the second an indirect system, with plate heat exchangers with an additional brine-to-air heat exchanger. Each system was considered to be able to work reversibly, with 5 k W design cooling capacity in summer and 8 k W design heating capacity in winter. Two separately developed simulation codes were used to calculate the required refrigerant charge and the efficiency of each of the systems. The charge was reduced by the use of microfinned tubes up to 22% in direct system reduced using microfinned tubes compared to the smooth tube. For the indirect system using specially designed plate heat exchangers with the minimum internal volume, their charge was reduced by up to 66% compared to normal plate heat exchangers.

Suggested Citation

  • Ehsan Allymehr & Geir Skaugen & Torsten Will & Ángel Álvarez Pardiñas & Trygve Magne Eikevik & Armin Hafner & Lena Schnabel, 2021. "Numerical Study of Hydrocarbon Charge Reduction Methods in HVAC Heat Exchangers," Energies, MDPI, vol. 14(15), pages 1-15, July.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:15:p:4480-:d:600759
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    References listed on IDEAS

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    1. Ehsan Allymehr & Ángel Álvarez Pardiñas & Trygve Magne Eikevik & Armin Hafner, 2021. "Condensation of Hydrocarbons in Compact Smooth and Microfinned Tubes," Energies, MDPI, vol. 14(9), pages 1-20, May.
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    Cited by:

    1. Moonis R. Ally & Brian Fricke, 2021. "Heat Transfer, Refrigeration and Heat Pumps," Energies, MDPI, vol. 14(23), pages 1-3, November.
    2. Yu Sun & Rijing Zhao & Siyuan Wu & Dong Huang, 2021. "Proposal, Robustness Analysis and Equivalent Implementation of Optimization Method for Row-by-Row Fin Distribution in Multi-Row Frosting Evaporator," Energies, MDPI, vol. 14(19), pages 1-17, September.

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