The Influence of the Greenhouse as Heat Source for Heat Pump Drying System Combined with Solar Greenhouse
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Abstract
This research studied and developed the prototype system of heat pump dryer combined with solar greenhouse. The fresh chili was used as agricultural product for doing the experiment. The test was performed to compare 2 cases of study, including heat pump obtained heat from ambient air and from solar greenhouse. The experiments were performed at the same conditions. For case 1, the evaporator of heat pump was opened to receive heat from ambient air, and case 2, the evaporator of heat pump was covered with greenhouse. Each test was conducted with 20 kg of fresh chili during 9:00 - 21:00 for each day (12 hrs. per day: 3 days). The fresh chili was dried in drying chamber at temperature of 60 °C. The experimental results showed that drying with case 2 provided the dried chili with average moisture content of 16.20 %(w.b.)., while drying with case 1 the average moisture content of dried chili was 22.15 %(w.b.). The total electricity energy consumption was equal to 19.8 kWh and 21.1 kWh, respectively. Drying by using evaporator of heat pump covered with greenhouse (case 2) had greater performance than case 1 system. The Specific Energy Consumption (SEC) of both cases was 4.64 kWh/kg and 1.66 kWh/kg, respectively. The SEC and SEEC of case 2 were lower than case 1 of 12 % and 15 %, respectively. These results revealed that the evaporator of heat pump covered with greenhouse (case 2) was a factor that helped to enhance the system’s performance. Thus, it reduced the energy consumption of compressor since the temperature of heat source was increased. The study of mentioned system can be used for further comparison.
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