Journal of Hydrogen and New Energy (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Effect of the Array Type of Heat Exchangers on Performance of Refrigerated Warehouse for Utilization of LNG Cold Energy

LNG 냉열활용을 위한 열교환기의 배열 형태가 냉동창고 성능에 미치는 연구

  • HAN, DANBEE (Department of Environment and Energy Engineering, The University of Suwon) ;
  • KIM, YUNJI (Department of Environment and Energy Engineering, The University of Suwon) ;
  • BYUN, HYUNSEUNG (Department of Environment and Energy Engineering, The University of Suwon) ;
  • BAEK, YOUNGSOON (Department of Environment and Energy Engineering, The University of Suwon)
  • 한단비 (수원대학교 환경에너지공학과) ;
  • 김윤지 (수원대학교 환경에너지공학과) ;
  • 변현승 (수원대학교 환경에너지공학과) ;
  • 백영순 (수원대학교 환경에너지공학과)
  • Received : 2019.06.04
  • Accepted : 2019.06.30
  • Published : 2019.06.30
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Abstract

When liquefied natural gas (LNG) is vaporized to form natural gas for industrial and household consumption, a tremendous amount of cold energy is transferred from LNG to seawater as a part of the phase-change process. This heat exchange loop is not only a waste of cold energy, but causes thermal pollution to coastal fishery areas by dumping the cold energy into the sea. This project describes an innovative new design for reclaiming cold energy for use by cold storage warehouses (operating in the 35 to $62^{\circ}C$ range). Conventionally, warehouse cooling is done by mechanical refrigeration systems that consume large amounts of electricity for the maintenance of low temperatures. Here, a closed loop LNG heat exchange system was designed (by simulator) to replace mechanical or vapor-compression refrigeration systems. The software PRO II with PROVISION V9.4 was used to simulate LNG cold energy, gas re-liquefaction, and the vaporized process under various conditions. The effects on sensible and latent heats from changes to the array type of heat exchangers have been investigated, as well as an examination of the optimum.

Keywords

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Fig. 2. LNG cold energy system model (serial type)

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Fig. 1. Modeling of refrigeration warehouse using cold energy of LNG.

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Fig. 3. LNG cold energy mixed system model (parallel)

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Fig. 4. LNG cold energy mixed system model (serial+parallel)

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Fig. 5. The relationship between vapor fraction and LNG tem-perature

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Fig. 7. Cold and required energy with warehouse capacity

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Fig. 6. Energy of main unit required with the amount of NG con-sumption

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Fig. 8. Cold and required energy with LNG supply

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Fig. 9. Cold and required energy with LNG supply amount

Table 1. The components of various LNG

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Table 2. Exit temperature for LNG heat exchangers

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Table 3. Cold and required energy with HX type

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Table 4. Vapor fraction of LNG with SF-grade warehouse ca-pacity at series-type HX

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Table 5. Vapor fraction of LNG with SF-grade warehouse ca-pacity at Mix-type HX

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