A cooperative located on the outskirts of Lusaka, employs a solar dryer having an effective collector area of 15m² to dry 100kg of fresh fruit initially having a moisture content of 80% (wet basis) to a moisture content of 5% (wet hasis), over a period of 3 days. A fan fitted on the dryer maintains an airflow of 0.6m. Calculate the system drying efficiency and Pick up efficiency of the dryer when it operates under the following climatic conditions: Total daily insolation incident upon collector 5.6kWh/m² per 12-hour-day Ambient air mean daily temperature-25°C Ambient air mean daily relative humidity-70% Mean temperature of the air entering the drying chamber-40°C Air leaves the drying chamber 100% saturated. Take Latent heat of vaporisation of water 2320kJkg Air density 2.28kgw
A cooperative located on the outskirts of Lusaka, employs a solar dryer having an effective collector area of 15m² to dry 100kg of fresh fruit initially having a moisture content of 80% (wet basis) to a moisture content of 5% (wet hasis), over a period of 3 days. A fan fitted on the dryer maintains an airflow of 0.6m. Calculate the system drying efficiency and Pick up efficiency of the dryer when it operates under the following climatic conditions:
Total daily insolation incident upon collector 5.6kWh/m² per 12-hour-day
Ambient air mean daily temperature-25°C Ambient air mean daily relative humidity-70%
Mean temperature of the air entering the drying chamber-40°C
Air leaves the drying chamber 100% saturated.
Take Latent heat of vaporisation of water 2320kJkg Air density 2.28kgw
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