Evaluation of heat storage and release in a double shell and tube heat exchanger with a PCM layer
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DOI 10.1007/s12206-020-0739-6
Journal of Mechanical Science and Technology 34 (8) 2020 Original Article DOI 10.1007/s12206-020-0739-6 Keywords: · Thermal storage type heat exchanger · Double shell and tube · Three heat transfer medium · Phase change material (PCM) · Heat storage
Correspondence to: Chaedong Kang [email protected]
Evaluation of heat storage and release in a double shell and tube heat exchanger with a PCM layer Donggyu Lee1 and Chaedong Kang2,3 1
2
Corp Research Institute, SUN E&C Co., Ltd., Jeonju-si 54956, Korea, Dept. of Mechanical Engineering, 3 Jeonbuk National University, Jeonju-si 54596, Korea, Geothermal Energy Technology Research Center, Jeonbuk National University, Jeonju-si 54596, Korea
Abstract
Citation: Lee, D., Kang, C. (2020). Evaluation of heat storage and release in a double shell and tube heat exchanger with a PCM layer. Journal of Mechanical Science and Technology 34 (8) (2020) ?~?. http://doi.org/10.1007/s12206-020-0739-6
Received February 19th, 2020 Revised
May 25th, 2020
Accepted June 11th, 2020 † Recommended by Editor Yong Tae Kang
In this study, a thermal storage type heat exchanger that combines heat storage and heat exchange functions has proposed and the heat transfer characteristics of the new type of heat exchanger were analyzed through experiments. The proposed thermal storage type heat exchanger has a shell and tube structure and allows mutual heat transfer between three or more mediums, including a phase change material (PCM). This thermal storage type heat exchanger contains 52.2 kg of a PCM with a phase change temperature of 68.8 °C to provide heat storage function. The heat transfer experiment of the heat exchanger confirmed the effect of the temperature change of the heating medium under the same flow conditions. Furthermore, due to the structural characteristics of the thermal storage type double shell and tube heat exchanger (TSDHE), the phenomenon of three-medium heat exchange (hot watercold water, hot water-PCM, additional water-PCM) was verified during the experimental process. In particular, due to the PCM filled inside the heat exchanger, the cold water received a heat transfer of 3 kW or higher from the PCM for at least 5 min (maximum 33 min), even when the hot water supply (heat source) was stopped. The results of this study will be used as basic data for applying a thermal storage type evaporator to a high temperature heat pump that generates steam using industrial waste heat.
1. Introduction
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Interest in unused energy has been increasing recently regions as strive toward efficient energy use and reduction of carbon dioxide emissions [1, 2]. Industrial waste heat (40~80 °C), which is a representative unused energy, is generated in the processes of power generation, food, and fiber industries. Technologies to efficiently recover industrial waste heat have been developed [3, 4], and networks have been constructed to use recovered energy [5]
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