전기히터식, 공기열원 및 지열원 열펌프식 농산물 열풍건조기의 사이클 해석에 의한 성능 비교

Agricultural hot air dryers, mostly electric type, require a significant amount of electrical energy to remove internal moisture from agricultural products. Air or geothermal source heat pump type dryers which absorb heat from the air or ground generate heat with the condenser of a heat pump system which results in less energy consumption compared to the electric heater type. In this study, cycle analysis is conducted to compare energy consumption and COP of three types of hot air dryers. Measured data of our previous experimental study were provided as input for the cycle analysis. For this study, 100 kg of red pepper was selected for the sample to be dried and Seoul weather data for 2017 was used for outdoor air conditions. During water season, the COP of electric, air source, and geothermal source are 0.91, 1.32, and 1.64, respectively. Thus in winter, the COP of air source and geothermal source are better than the electric type by 45.1% and 80.2%, respectively. During summer season, the COP of electric, air source, and geothermal source are 0.91, 1.68, and 1.84, respectively. Thus in summer, the COP of air source and geothermal source are better than the electric type by 84.6% and 102.2%, respectively.