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Design Evaluation for a Finned-Tube CO 2 Gas Cooler in Residential Applications

Author

Listed:
  • Charalampos Alexopoulos

    (Laboratory of Steam Boilers and Thermal Plants, Department of Thermal Engineering, School of Mechanical Engineering, National Technical University of Athens, 9 Heroon Polytechniou Street, 15780 Zografou, Greece)

  • Osama Aljolani

    (Chair of Engineering Thermodynamics and Transport Processes (LTTT), Center of Energy Technology (ZET), Faculty of Engineering Science, University of Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany)

  • Florian Heberle

    (Chair of Engineering Thermodynamics and Transport Processes (LTTT), Center of Energy Technology (ZET), Faculty of Engineering Science, University of Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany)

  • Tryfon C. Roumpedakis

    (Laboratory of Steam Boilers and Thermal Plants, Department of Thermal Engineering, School of Mechanical Engineering, National Technical University of Athens, 9 Heroon Polytechniou Street, 15780 Zografou, Greece)

  • Dieter Brüggemann

    (Chair of Engineering Thermodynamics and Transport Processes (LTTT), Center of Energy Technology (ZET), Faculty of Engineering Science, University of Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany)

  • Sotirios Karellas

    (Laboratory of Steam Boilers and Thermal Plants, Department of Thermal Engineering, School of Mechanical Engineering, National Technical University of Athens, 9 Heroon Polytechniou Street, 15780 Zografou, Greece)

Abstract

Towards the introduction of environmentally friendlier refrigerants, CO 2 cycles have gained significant attention in cooling and air conditioning systems in recent years. In this context, a design procedure for an air finned-tube CO 2 gas cooler is developed. The analysis aims to evaluate the gas cooler design incorporated into a CO 2 air conditioning system for residential applications. Therefore, a simulation model of the gas cooler is developed and validated experimentally by comparing its overall heat transfer coefficient. Based on the model, the evaluation of different numbers of rows, lengths, and diameters of tubes, as well as different ambient temperatures, are conducted, identifying the most suitable design in terms of pressure losses and required heat exchange area for selected operational conditions. The comparison between the model and the experimental results showed a satisfactory convergence for fan frequencies from 50 to 80 Hz. The absolute average deviations of the overall heat transfer coefficient for fan frequencies from 60 to 80 Hz were approximately 10%. With respect to the gas cooler design, a compromise between the bundle area and the refrigerant pressure drop was necessary, resulting in a 2.11 m 2 bundle area and 0.23 bar refrigerant pressure drop. In addition, the analysis of the gas cooler’s performance in different ambient temperatures showed that the defined heat exchanger operates properly, compared to other potential gas cooler designs.

Suggested Citation

  • Charalampos Alexopoulos & Osama Aljolani & Florian Heberle & Tryfon C. Roumpedakis & Dieter Brüggemann & Sotirios Karellas, 2020. "Design Evaluation for a Finned-Tube CO 2 Gas Cooler in Residential Applications," Energies, MDPI, vol. 13(10), pages 1-17, May.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:10:p:2428-:d:357198
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    References listed on IDEAS

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    1. Tao, Y.B. & He, Y.L. & Tao, W.Q., 2010. "Exergetic analysis of transcritical CO2 residential air-conditioning system based on experimental data," Applied Energy, Elsevier, vol. 87(10), pages 3065-3072, October.
    2. Andrei David & Brian Vad Mathiesen & Helge Averfalk & Sven Werner & Henrik Lund, 2017. "Heat Roadmap Europe: Large-Scale Electric Heat Pumps in District Heating Systems," Energies, MDPI, vol. 10(4), pages 1-18, April.
    3. Lei Chai & Konstantinos M. Tsamos & Savvas A. Tassou, 2020. "Modelling and Evaluation of the Thermohydraulic Performance of Finned-Tube Supercritical Carbon Dioxide Gas Coolers," Energies, MDPI, vol. 13(5), pages 1-19, February.
    4. Ajay Gambhir & Tamaryn Napp & Adam Hawkes & Lena Höglund-Isaksson & Wilfried Winiwarter & Pallav Purohit & Fabian Wagner & Dan Bernie & Jason Lowe, 2017. "The Contribution of Non-CO 2 Greenhouse Gas Mitigation to Achieving Long-Term Temperature Goals," Energies, MDPI, vol. 10(5), pages 1-23, May.
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