A study on development of the thermal storage type plate heat exchanger including PCM layer

Abstract

Thermal storage type plate heat exchanger (TSPHEs) was newly developed in the process of research a heat pump using industrial waste heat as a heat source for evaporation. A conventional plate heat exchanger is a structure in which two media perform heat transfers through a separation plate. However, TSPHEs have a structure in the basic structure of conventional plate heat exchanger adding the PCM layer filled to phase change material. Therefore, the TSPHEs performed heat exchange between three heat media (hot water-cold water-PCM). The thermal energy supplied through the hot water is mainly transferred to the cold water and some of it is transferred to the phase change material filled in the PCM layer. When if the hot water is shut down and the heat source can’t be supplied, the heat stored in the PCM layer is transferred to the cold water through the hot water, the medium of transmission. In the article, using the ε-NTU method, a thermal equilibrium equation is established between the three heats media used in the TSPHEs. Based on the established theoretical formula, the relationship between total overall heat transfer coefficient and ε, S (temperature differential), and Cr (heat capacity ratio) was obtained. In addition, the validity of the theoretical analysis was demonstrated through the experimental method and compared with the correlation of the existing overall heat transfer coefficient. The results of this article will be utilized as basic data for the design of the TSPHEs, and will be used to predict the amount of heat exchange and thermal storage capacity of the TSPHEs.

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Acknowledgments

This work was supported by Energy Demand Management Core Technology Development Project (10049090, A development of 300 kW high temperature heat pumps for steam supply up to 120 °C for industrial use) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea). And, thanks for the help given to the experimental process by graduate student Kim, Dong-Hyun. Also, thanks to Samil Industries Co., Ltd., located in Jeonju-si, Jeollabuk-do, Korea for helping to produce prototypes.

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Correspondence to Chaedong Kang.

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Recommended by Associate Editor Young Soo Chang

Donggyu Lee received B.S. and M.S. degrees in mechanical engineering from Jeonbuk National University in 2006 and 2008. And, he went on to earn doctoral of engineering from the same university in 2015. His research interests are in the areas of refrigeration, HVACs, ice storage systems, geothermal energy system. In recent years, he has been studying heat exchanger that combines thermal storage and heat exchange function using phase change materials.

Chaedong Kang received a B.S. degree in mechanical engineering from Kyung-hee University in 1985 and an M.S. degree in mechanical engineering from KAIST in 1989. He then went on to earn his Dr. Eng. degree from the Tokyo Institute of Technology in 1997. Dr. Kang is currently the Professor of the Department of Mechanical Engineering at Jeonbuk National University in Jeonju, Korea. His research interests are in the areas of refrigeration, building HVACs, ice storage systems, and molecular simulation.

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Lee, D., Kang, C. A study on development of the thermal storage type plate heat exchanger including PCM layer. J Mech Sci Technol 33, 6085–6093 (2019). https://doi.org/10.1007/s12206-019-1152-x

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Keywords

  • Thermal storage type heat exchanger
  • Phase change material (PCM)
  • Three-heat transfer medium
  • Heat storage and release
  • Effective-ness-NTU