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Exergy Analysis for Utilizing Latent Energy of Thermal Energy Storage System in District Heating

Author

Listed:
  • Joong Yong Yi

    (Yujin Energy Consulting Co., Gyeonggi-do 14047, Korea)

  • Kyung Min Kim

    (Korea District Heating Corp., Gyeonggi-do 17099, Korea)

  • Jongjun Lee

    (Korea District Heating Corp., Gyeonggi-do 17099, Korea)

  • Mun Sei Oh

    (Korea District Heating Corp., Gyeonggi-do 17099, Korea)

Abstract

The thermal energy storage (TES) system stores the district heating (DH) water when the heating load is low. Since a TES system stores heat at atmospheric pressure, the DH water temperature of 115 °C has to be lowered to less than 100 °C. Therefore, the temperature drop of the DH water results in thermal loss during storage. In addition, the DH water must have high pressure to supply heat to DH users a long distance from the CHP plant. If heat is to be stored in the TES system, a pressure drop in the throttling valve occurs. These exergy losses, which occur in the thermal storage process of the general TES system, can be analyzed by exergy analysis to identify the location, cause and the amount of loss. This study evaluated the efficiency improvement of a TES system through exergy calculation in the heat storage process. The method involves power generation technology using the organic Rankine cycle (ORC) and a hydraulic turbine. As a result, the 930 kW capacity ORC and the 270 kW capacity hydraulic turbine were considered suitable for a heat storage system that stores 3000 m 3 /h. In this case, each power generation facility was 50% of the thermal storage capacity, which was attributed to the variation of actual heat storage from the annual operating pattern analysis. Therefore, it was possible to produce 1200 kW of power by recovering the exergy losses. The payback period of the ORC and the hydraulic turbine will be 3.5 and 7.13 years, respectively.

Suggested Citation

  • Joong Yong Yi & Kyung Min Kim & Jongjun Lee & Mun Sei Oh, 2019. "Exergy Analysis for Utilizing Latent Energy of Thermal Energy Storage System in District Heating," Energies, MDPI, vol. 12(7), pages 1-13, April.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:7:p:1391-:d:221733
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    References listed on IDEAS

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    5. Dimitris Al. Katsaprakakis & Georgios Zidianakis, 2019. "Optimized Dimensioning and Operation Automation for a Solar-Combi System for Indoor Space Heating. A Case Study for a School Building in Crete," Energies, MDPI, vol. 12(1), pages 1-21, January.
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    1. Lisa Branchini & Andrea De Pascale & Francesco Melino & Noemi Torricelli, 2020. "Optimum Organic Rankine Cycle Design for the Application in a CHP Unit Feeding a District Heating Network," Energies, MDPI, vol. 13(6), pages 1-22, March.

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