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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Performance Analysis on a Heat Pump System using Waste Heat

폐열이용 열펌프시스템의 성능에 관한 연구

  • Park, Youn Cheol (Department of Mechanical Engineering, Jeju National University) ;
  • Song, Lei (Department of Mechanical Engineering, Graduate School, Jeju National University) ;
  • Ko, Gwang Soo (Department of Mechanical Engineering, Graduate School, Jeju National University)
  • 박윤철 (제주대학교 기계공학과) ;
  • 송뢰 (제주대학교 일반대학원 기계공학과) ;
  • 고광수 (제주대학교 일반대학원 기계공학과)
  • Received : 2018.11.01
  • Accepted : 2018.11.28
  • Published : 2018.12.01
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Abstract

This study was conducted for analysis of a heat pump system using waste heat in an enclosed space such as a green house. The model was developed with mathematical equations in literature and Engineering Equation Solver (EES) was used to get the solution of the developed equations. The simulation results have 5% of reliability comparing the results with actual test data of heat pump system's dynamic operation. The operating performance of the system was calculated with variation of working fluid temperature in the thermal storage tank such as $25^{\circ}C$, $35^{\circ}C$, $45^{\circ}C$ and $55^{\circ}C$. As a result, the system's the highest total heating capacity shows 280 kWh and the storage tank's operating time decreased as the starting storage tank's temperature was high.

Keywords

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Fig. 1. Flow chart of heat pump system simulation.

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Fig. 2. Schematic of heat storage tank source heating mode and outdoor air source heating mode.

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Fig. 3. Comparison of the experimental and simulated data for compressor power.

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Fig. 4. Comparison of the experimental and simulated data for heating capacity.

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Fig. 5. Comparison of the experimental and simulated data for COP at thermal storage mode.

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Fig. 6. Indoor and outdoor temperature variation with time when storage tank water temperature start at 25℃.

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Fig. 7. Indoor and outdoor temperature variation with time when storage tank water temperature start at 35℃.

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Fig. 8. Indoor and outdoor temperature variation with time when storage tank water temperature start at 45℃.

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Fig. 9. Indoor and outdoor temperature variation with time when storage tank water temperature start at 55℃.

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Fig. 10. Comparison of heating and thermal storage capacity with different initial water temperature of thermal storage tank.

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Fig. 11. Comparison of operating time of heating and thermal storage mode with different initial water temperature of thermal storage tank.

Table 1. Numerical value of A and B in equations

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