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Characteristics of Refrigerant Boiling Heat Transfer in Rectangular Mini-Channels during Various Flow Orientations

Author

Listed:
  • Magdalena Piasecka

    (Faculty of Mechatronics and Mechanical Engineering, Kielce University of Technology, 25-314 Kielce, Poland)

  • Kinga Strąk

    (Faculty of Mechatronics and Mechanical Engineering, Kielce University of Technology, 25-314 Kielce, Poland)

Abstract

This paper reports the results of heat transfer during refrigerant flow in rectangular mini-channels at stationary conditions. The impacts of selected parameters on boiling are discussed, i.e., thermal and flow parameters, dimensions and orientation of the channels. Four refrigerants (FC-72, HFE-649, HFE-7000 and HFE-7100) were used as the working fluid. Research was carried out on the experimental set-up with the test section with a single rectangular mini-channel of 180 mm long and with a group of five parallel mini-channels, each 32 mm long. The temperature of the mini-channel’s heated wall was measured by infrared thermography. Local values of the heat transfer coefficient at the contact surface between the fluid and the plate were calculated using the 1D mathematical method. The results are presented as the relationship between the heat transfer coefficient and the distance along the mini-channel length and boiling curves. Two-phase flow patterns are shown. Moreover, the results concerning various refrigerants and the use of modified heater surfaces are discussed. The main factors influencing the heat transfer process were: mini-channel inclination to the horizontal pane (the highest heat transfer coefficient at 270° and 0°), using modified heater surfaces (especially electroerosion texturing and vibration-assisted laser No. 2 texturing) and working fluids (FC-72 and HFE-7000).

Suggested Citation

  • Magdalena Piasecka & Kinga Strąk, 2021. "Characteristics of Refrigerant Boiling Heat Transfer in Rectangular Mini-Channels during Various Flow Orientations," Energies, MDPI, vol. 14(16), pages 1-30, August.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:16:p:4891-:d:611981
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    References listed on IDEAS

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    1. Magdalena Piasecka & Beata Maciejewska & Paweł Łabędzki, 2020. "Heat Transfer Coefficient Determination during FC-72 Flow in a Minichannel Heat Sink Using the Trefftz Functions and ADINA Software," Energies, MDPI, vol. 13(24), pages 1-25, December.
    2. Łukasz J. Orman & Norbert Radek & Jacek Pietraszek & Marcin Szczepaniak, 2020. "Analysis of Enhanced Pool Boiling Heat Transfer on Laser—Textured Surfaces," Energies, MDPI, vol. 13(11), pages 1-19, May.
    3. Slawomir Blasiak, 2020. "Influence of Thermoelastic Phenomena on the Energy Conservation in Non-Contacting Face Seals," Energies, MDPI, vol. 13(20), pages 1-16, October.
    4. Zhi-Chuan Sun & Xiang Ma & Lian-Xiang Ma & Wei Li & David J. Kukulka, 2019. "Flow Boiling Heat Transfer Characteristics in Horizontal, Three-Dimensional Enhanced Tubes," Energies, MDPI, vol. 12(5), pages 1-25, March.
    5. Magdalena Piasecka & Sylwia Hożejowska & Beata Maciejewska & Anna Pawińska, 2021. "Time-Dependent Heat Transfer Calculations with Trefftz and Picard Methods for Flow Boiling in a Mini-Channel Heat Sink," Energies, MDPI, vol. 14(7), pages 1-24, March.
    6. Artur Maciąg & Krzysztof Grysa, 2021. "Trefftz Method of Solving a 1D Coupled Thermoelasticity Problem for One- and Two-Layered Media," Energies, MDPI, vol. 14(12), pages 1-16, June.
    7. Robert Kaniowski & Robert Pastuszko, 2021. "Pool Boiling of Water on Surfaces with Open Microchannels," Energies, MDPI, vol. 14(11), pages 1-21, May.
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    1. Magdalena Piasecka & Sylwia Hożejowska & Anna Pawińska & Dariusz Strąk, 2022. "Heat Transfer Analysis of a Co-Current Heat Exchanger with Two Rectangular Mini-Channels," Energies, MDPI, vol. 15(4), pages 1-19, February.

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