Thermal Balance of a Water Thermal Accumulator Based on Phase Change Materials

Bocharov, G.S.; Dedov, A.V.; Eletskii, A.V.; Vagin, A.O.; Zacharenkov, A.V.; Zverev, M.A.

Авторы: Bocharov Grigorii S., Dedov Alexey V., Eletskii Alexander V., Vagin Artem O., Zacharenkov Alexander V., Zverev Michail A.
Журнал: Journal of Composites Science
Том: 7
Номер: 9
Год издания: 2023
Издательство: MDPI
Местоположение издательства: Basel, Switzerland
Первая страница: 399
Последняя страница: 418
DOI: 10.3390/jcs7090399
Аннотация: The arrangement of a water thermal accumulator (WTA) containing phase change materials(PCM) is presented and analyzed. The hot or cool water is used as a working body. The accumulatorcontains two concentric cylindrical tubes. The inner tube is used for hot or cool water flowing,while the volume between the inner and outer tubes is filled with PCM. The thermal energy in theaccumulator is stored as a result of flowing the hot water through the inner tube due to the phasetransition in PCM. This accumulated energy can be extracted from PCM as a result of flowing thecool water through the inner tube. For the enhancement of the thermal conduction coefficient, thePCM is doped with the nanocarbon particles having a thermal conductivity coefficient exceedingthat of PCM by 4–5 orders of magnitude. The thermal balance of the accumulator is calculated onthe basis of the solution of the time-dependent heat conduction equation by taking into accountthe heat absorbed and released as a result of the phase transition as well as the convection thermalexchange in the melted PCM. The calculation results determine the interconnection between thethermal conductivity of PCM and the characteristic time of thermal exchange between PCM and theworking body. The calculations indicate that the characteristic thermal exchange time decreases asthe thermal conduction coefficient enhances, so that the dependence becomes close to saturation atthe thermal conductivity coefficient of about 5 W/m K. Such a coefficient can be reached by dopingthe paraffin-based PCM with a reduced graphene oxide at a content of about 2% (weight).
Добавил в систему: Ермолаева Елена Олеговна

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