Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Optimum Design of Middle-Sized CO2 Water Heater

중형 이산화탄소 급탕기의 최적 설계

  • Park, Hanvit (Department of Mechanical Engineering, Hanbat National University) ;
  • Yun, Rin (Department of Mechanical Engineering, Hanbat National University) ;
  • Kim, Young Deug (Department of Mechanical and Automotive Engineering, Induk University)
  • 박한빛 (한밭대학교 기계공학과) ;
  • 윤린 (한밭대학교 기계공학과) ;
  • 김영득 (인덕대학교 기계자동차공학과)
  • Received : 2012.11.01
  • Published : 2013.04.10
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Abstract

Middle-sized $CO_2$ water heater having compressor power of 7.45 kW was designed, and its performances were experimentally tested. Besides, optimum design of the $CO_2$ water heater was conducted by cycle simulation. When ambient temperature of $7^{\circ}C$ and hot water outlet temperature of $80^{\circ}C$ the $CO_2$ water heater showed the COP of 3.2. As hot water temperature increased the COP is getting decreased due to significant increase of compressor power consumption compared to increasing rate of heating capacity. When ambient temperature increased from $-3^{\circ}C$ to $12^{\circ}C$ the COP increased by 30%. The optimum components design of a gas cooler, an internal heat exchanger, and an evaporator were conducted, and the experimental correlation between amount of EEV opening and ambient temperature, and hot water temperature was suggested.

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References

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