Performance testing of the tandem hybrid solar-biomass dryer for coffee cherry drying
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Abstract
The results indicated that the temperature, relative humidity, and chimney air velocity of the front drying chamber were 59.8(±6.3)oC, 27.5.6(±13.0)%, and 1.3(±0.44)m/s while the temperature, relative humidity and chimney air velocity of the rear drying chamber was 57.1(± 6.1)oC,73.0(±8.8)%, and 0.35(±0.07)m/s with the referent ambient temperature and relative humidity were 30.4(±2.1)oC and 73.8(±9.9)%. The moisture content of the coffee cherries decreased drying time following a sigmoid-shaped curve model for all cherry samples of the bed thicknesses in both drying chambers. The coffee cherry drying process for the front drying chamber was faster than that of the rear drying chamber. The time to complete the drying process marked by the green bean maximum moisture content of 12% for the bed thicknesses of 3, 6, 9, and 12 cm were 58.7 h, 62.3 h, 73.8 h, and 86.9 h respectively for the cherry samples in the front drying chamber and 71.0 h, 80.8 h, 88.7 h and 91.4 h for the cherry samples in the rear drying chamber suggesting that the dryer needed to be further explored for a wider range of drying temperature, cherry bed thicknesses, and the result in coffee beans quality leading to adoption for the users.
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