The effect of metal wool on the charging and discharging rate of the phase transition thermal storage material

Authors

DOI:

https://doi.org/10.15587/1729-4061.2021.239065

Keywords:

phase change material for thermal energy storage, paraffin wax, metal wool, heating and cooling rate, thermal conductivity

Abstract

Thermal energy storage (TES) plays an important role in solar heat power systems. The use of phase change materials (PCM) and selecting additives to increase the rate of heat accumulation is a promising way to increase the efficiency and reliability of such systems.

The objects of the study were pure paraffin wax (PW) and composite PCMs based on it (containing aluminum and copper wool of 30 and 45 μm in diameter, respectively).

An experimental setup with a cylindrical measuring cell was created, which was also considered as a model of a capsule with a thermal storage material. The rate of temperature change in the pure PW sample and samples of composite PCMs was experimentally measured. Two modes of heating and cooling were investigated: from 48 to 59 °C (mode with a phase change) and from 30 to 40 °C (mode without phase changes).

Heating time from 48 to 59 °C for the PW sample was 13 min., for the PW samples with the content of aluminum wool of 0.00588 and 0.01780 m3·m-3 − 11 and 10.5 min., for the PW samples with the content of copper wool of 0.00524 and 0.01380 m3·m-3 − 11 and 8 min., correspondingly. The minimum heating time from 30 to 40 °C was 6 min. for the sample of PW with 0.01380 m3·m-3 of copper wool in comparison with 9 min. for the sample of pure PW.

The expediency of using copper wool as an additive to thermal storage materials of PW to increase the charging and discharging rate of TES devices without significantly raising their price was confirmed. The presence of metal wool in molten PW suppresses bottom-up convective currents, so the main mechanism of heat transfer is thermal conductivity. This fact will contribute to a faster equalization of the temperature field by the height of heat storage capsules

Author Biographies

Olga Khliyeva, Odessa National Academy of Food Technologies

Doctor of Technical Sciences, Professor

Department of Thermophysics and Applied Ecology

Vitaly Zhelezny, Odessa National Academy of Food Technologies

Doctor of Technical Sciences, Professor

Department of Thermophysics and Applied Ecology

Aleksey Paskal, Odessa National Academy of Food Technologies

Postgraduate Student

Department of Thermophysics and Applied Ecology

Yana Hlek, Odessa National Academy of Food Technologies

Postgraduate Student

Department of Thermophysics and Applied Ecology

Dmytro Ivchenko, Odessa National Academy of Food Technologies

Lecturer

Department of Thermophysics and Applied Ecology

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Published

2021-08-27

How to Cite

Khliyeva, O., Zhelezny, V., Paskal, A., Hlek, Y., & Ivchenko, D. (2021). The effect of metal wool on the charging and discharging rate of the phase transition thermal storage material . Eastern-European Journal of Enterprise Technologies, 4(5(112), 12–20. https://doi.org/10.15587/1729-4061.2021.239065

Issue

Vol. 4 No. 5(112) (2021): Applied physics

Section

Applied physics

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Copyright (c) 2021 Olga Khliyeva, Vitaly Zhelezny, Aleksey Paskal, Yana Hlek, Dmytro Ivchenko

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