The heat pump dehydrator was developed to enhance the energy efficiency of the drying process recovering the latent heat. The drying system typically consists of evaporator, condenser, compressor, fan, and a drying chamber with trays or trolleys of trays (please refer to bellowing photo). In this drying system, water is removed from the product without outside ventilation, because the system is totally enclosed with air recirculated fully. Warm or hot dry air is drawn from the condenser and blown across the drying chamber containing the wet material. The hot humid air exiting from the drying chamber moves over to the evaporator to cool below the dew point temperature, which causes condensation, thereby removing the water in the air. The cool dry air from the evaporator is pumped back into the condenser to increase to the desired temperature. The heated air is then returned to the drying chamber, which completes the cycle. The key advantage of the system is that less drying time at lower temperature can be achieved compared to the conventional hot air drying due to comparatively lower relative humidity, and it is very energy saving up to 75%.
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