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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Energy Performance Analysis of Electric Heater and Heat Pump Food Dryers

전기히터식 및 히트펌프식 식품 건조기의 에너지 성능 비교

  • Yu, Young Woo (Graduate School of Energy and Environment, Seoul National University of Science & Technology) ;
  • Kim, Young Il (School of Architecture, Seoul National University of Science & Technology) ;
  • Park, Seungtae (ATENG)
  • 유영우 (서울과학기술대학교 에너지환경대학원) ;
  • 김영일 (서울과학기술대학교 건축학부) ;
  • 박승태 ((주)에이티이앤지)
  • Received : 2015.07.07
  • Accepted : 2015.09.25
  • Published : 2015.12.01
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Abstract

In this study, energy performance of two types of food dryers which are electric heater and heat pump is studied experimentally. With drying chamber temperatures controlled at 45, 50 and $55^{\circ}C$, sliced radish is dried from an initial mass of 90 to final 7 kg. Moisture content, drying time, total power consumption, MER (moisture extraction rate, kg/h) and SMER (specific moisture extraction rate, kg/kWh) are measured and analyzed. As the drying chamber temperature is increased, drying time is shortened but energy efficiency is reduced for both types. For an electric heater dryer, the effect of chamber temperature on drying time is significant but less significant on energy efficiency. For a heat pump dryer, the dependence of chamber temperature on drying time is weak but strong on energy efficiency. Temperature levels have little effect on electric heater dryer performance but strong effect on heat pump dryer which operates on a vapor compression refrigeration cycle. The energy performance of the heat pump dryer is superior with an average SMER of 2.175 kg/kWh which is 2.22 times greater than that of the electric heater dryer with SMER of 1.224 kg/kWh.

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References

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