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Online Determining Heat Transfer Coefficient for Monitoring Transient Thermal Stresses

Author

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  • Magdalena Jaremkiewicz

    (Department of Energy, Cracow University of Technology, Al. Jana Pawła II 37, 31-864 Cracow, Poland)

  • Jan Taler

    (Department of Energy, Cracow University of Technology, Al. Jana Pawła II 37, 31-864 Cracow, Poland)

Abstract

This paper proposes an effective method for determining thermal stresses in structural elements with a three-dimensional transient temperature field. This is the situation in the case of pressure elements of complex shapes. When the thermal stresses are determined by the finite element method (FEM), the temperature of the fluid and the heat transfer coefficient on the internal surface must be known. Both values are very difficult to determine under industrial conditions. In this paper, an inverse space marching method was proposed for the determination of the heat transfer coefficient on the active surface of the thick-walled plate. The temperature and heat flux on the exposed surface were obtained by measuring the unsteady temperature in a small region on the insulated external surface of a pressure component that is easily accessible. Three different procedures for the determination of the heat transfer coefficient on the water-spray surface were presented, with the division of the plate into three or four finite volumes in the normal direction to the plate surface. Calculation and experimental tests were carried out in order to validate the method. The results of the measurements and calculations agreed very well. The computer calculation time is short, so the technique can be used for online stress determination. The proposed method can be applied to monitor thermal stresses in the components of the power unit in thermal power plants, both conventional and nuclear.

Suggested Citation

  • Magdalena Jaremkiewicz & Jan Taler, 2020. "Online Determining Heat Transfer Coefficient for Monitoring Transient Thermal Stresses," Energies, MDPI, vol. 13(3), pages 1-13, February.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:3:p:704-:d:317178
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    References listed on IDEAS

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    1. Luca Riboldi & Lars O. Nord, 2017. "Lifetime Assessment of Combined Cycles for Cogeneration of Power and Heat in Offshore Oil and Gas Installations," Energies, MDPI, vol. 10(6), pages 1-23, May.
    2. Taler, Jan & Zima, Wiesław & Ocłoń, Paweł & Grądziel, Sławomir & Taler, Dawid & Cebula, Artur & Jaremkiewicz, Magdalena & Korzeń, Anna & Cisek, Piotr & Kaczmarski, Karol & Majewski, Karol, 2019. "Mathematical model of a supercritical power boiler for simulating rapid changes in boiler thermal loading," Energy, Elsevier, vol. 175(C), pages 580-592.
    3. Liping Pang & Size Yi & Liqiang Duan & Wenxue Li & Yongping Yang, 2019. "Thermal Stress and Cyclic Stress Analysis of a Vertical Water-Cooled Wall at a Utility Boiler under Flexible Operation," Energies, MDPI, vol. 12(6), pages 1-18, March.
    4. Magdalena Jaremkiewicz & Dawid Taler & Piotr Dzierwa & Jan Taler, 2019. "Determination of Transient Fluid Temperature and Thermal Stresses in Pressure Thick-Walled Elements Using a New Design Thermometer," Energies, MDPI, vol. 12(2), pages 1-21, January.
    5. Jaremkiewicz, Magdalena & Dzierwa, Piotr & Taler, Dawid & Taler, Jan, 2019. "Monitoring of transient thermal stresses in pressure components of steam boilers using an innovative technique for measuring the fluid temperature," Energy, Elsevier, vol. 175(C), pages 139-150.
    Full references (including those not matched with items on IDEAS)

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    Cited by:

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    2. Jerzy Okrajni & Mariusz Twardawa & Krzysztof Wacławiak, 2021. "Impact of Heat Transfer on Transient Stress Fields in Power Plant Boiler Components," Energies, MDPI, vol. 14(4), pages 1-19, February.
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