Journal of the Korean Society for Geothermal and Hydrothermal Energy (한국지열·수열에너지학회논문집)

Korean Society for Geothermal and Hydrothermal Energy (한국지열·수열에너지학회)
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Feasibility Study on Leveling Method of Electric Power Load by Applying Thermal Storage Air Conditioning System

축열식 열원시스템 적용에 의한 전력부하 평준화의 경제성 검토

  • Lee, Chulgoo (Department of Architectural Engineering, Semyung University)
  • Received : 2019.01.28
  • Accepted : 2019.02.28
  • Published : 2019.03.01
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Abstract

Reducing global warming potential has become important, and as one of those methods for reducing it, economic evaluation by applying ice thermal storage air conditioning system was performed. The floor area and height of the subject building was assumed $5,000m^2$ and 20 m. Absorption chillerheater system and air source heat pump system was used for comparing to the subject system, and payback period method was used to perform economic evaluation. Although the running cost of ice thermal storage system is reduced compared to two systems, the ratio is not significant compared to the increase of initial construction expenses, and payback period was calculated to be about 7.7 and 79.3 years. However, the heat storage system should be approached from the viewpoint of long term rather than the economic standard in the present standard.

Keywords

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Fig. 1. Schematic diagram of ice thermal storage system.

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Fig. 2. Schematic diagram of gas using apsorption chillerheater system.

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Fig. 3. Schematic diagram of air source heat pumpsystem.

Table 1. Initial cost of ice thermal storage system

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Table 2. Initial cost of gas using absorption chillerheater system

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Table 3. Initial cost of air source heat pump system

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Table 4. Energy use rate in existing study and amount of energy use for this study

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Table 5. Monthly and annual energy use of refrigerator, cooling tower, boiler, FCU and pumps in ice thermal storage system

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Table 6. Monthly and annual energy use of chiller-heater, cooling tower, FCU and pumps in gas using absorption chillerheater system

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Table 7. Monthly mean temperature, COP and energy use of heat pump in air source heat pump system

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Table 8. Electric rate by seasonal and time variance

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Table 9. Electric rate of night electricity

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Table 10. Gas rate by seasonal variance

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Table 11. Monthly and annual operating cost in ice thermal storage system (refrigerator＋cooling tower＋boiler＋FCU＋pumps) (1,000won)

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Table 12. Monthly and annual operating cost in gas using absorption chiller-heater system (chiller-heater＋cooling tower＋FCU＋pumps) (1,000won)

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Table 13. Monthly and annual operating cost in air source heat pump system (1,000won)

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References

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