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Determination of Heat Losses from the Pipeline in SDHW System during the Continuous Change of the Supply Temperature

Author

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  • Miroslaw Zukowski

    (Department of HVAC Engineering, Faculty of Civil Engineering and Environmental Sciences, Bialystok University of Technology, Wiejska 45E Street, 15-351 Bialystok, Poland)

Abstract

In this article, the research object is the solar domestic hot water (SDHW) heating system that has been in operation since 2015 and is located on the campus of the Bialystok University of Technology (Poland). The thermal performance of solar collectors are thoroughly investigated so far. Therefore, special attention was paid to the issue of the heat loss from pipes. The measurements showed that the heat transfer in circulation pipes is quite complex due to continuous fluctuations in water temperature at the supply of this loop. As it turned out, the application of the classical method of energy balancing and the readings from heat meters gave inaccurate results in this case. The main aim of this study was to develop a different approach to solving the problem of determination of heat losses. The method presented in this article is based on computational fluid dynamics (CFD) and measurement results as the input data. The practical result of this study was the development of two relationships for calculating the heat loss from pipes. A separate issue, that is discussed in this paper, concerns the impact of the time intervals used in numerical simulations on the accuracy of calculation results.

Suggested Citation

  • Miroslaw Zukowski, 2020. "Determination of Heat Losses from the Pipeline in SDHW System during the Continuous Change of the Supply Temperature," Energies, MDPI, vol. 14(1), pages 1-21, December.
    • Handle: RePEc:gam:jeners:v:14:y:2020:i:1:p:90-:d:468709
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    References listed on IDEAS

    as
    1. Deeble, V. C., 1994. "Effectiveness of PVC coatings as thermal insulation for domestic hot-water piping," Applied Energy, Elsevier, vol. 48(1), pages 51-64.
    2. Zaaoumi, Anass & Asbik, Mohamed & Hafs, Hajar & Bah, Abdellah & Alaoui, Mohammed, 2021. "Thermal performance simulation analysis of solar field for parabolic trough collectors assigned for ambient conditions in Morocco," Renewable Energy, Elsevier, vol. 163(C), pages 1479-1494.
    3. El-Nashar, Ali M., 2006. "Heat loss through the piping of a large solar collector field," Energy, Elsevier, vol. 31(12), pages 2020-2035.
    Full references (including those not matched with items on IDEAS)

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