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Evaluation of heat storage and release in a double shell and tube heat exchanger with a PCM layer

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Abstract

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 water-cold 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.

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Abbreviations

A :

Heat transfer surface area, m2

C.L. :

Confidence level

C p :

Specific heat, kJ/kg·K

D :

Diameter, mm

G :

Volumetric flow rate, LPM

P :

Pressure, kPa

Q :

Heat transfer rate, kW

R :

Heat storage ratio, %

T :

Temperature, °C

k :

Coverage factor

L :

Length, m

ṁ :

Mass flow rate, kg/s

t :

Time, s

P:

Phase change material (PCM)

a:

Additional water

c:

Cold water

f:

Final

h:

Hot water

i:

Inlet

m:

Average value

o:

Outlet

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Acknowledgments

This work was supported by (1) the Energy Demand Management Core Technology Development Project (10049090, 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 (2) the Jeonbuk National University funds for domestic research (JBNU-09-2016).

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Authors and Affiliations

  1. Corp Research Institute, SUN E&C Co., Ltd., Jeonju-si, 54956, Korea

    Donggyu Lee

  2. Dept. of Mechanical Engineering, Jeonbuk National University, Jeonju-si, 54596, Korea

    Chaedong Kang

  3. Geothermal Energy Technology Research Center, Jeonbuk National University, Jeonju-si, 54596, Korea

    Chaedong Kang

Authors
  1. Donggyu Lee
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  2. Chaedong Kang
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Correspondence to Chaedong Kang.

Additional information

Recommended by Editor Yong Tae Kang

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 Kyunghee 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 an Associate 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. Evaluation of heat storage and release in a double shell and tube heat exchanger with a PCM layer. J Mech Sci Technol 34, 3471–3480 (2020). https://doi.org/10.1007/s12206-020-0739-6

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  • DOI: https://doi.org/10.1007/s12206-020-0739-6

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