Bevel-helical gear reducers B3 Flender MD Helical gear units vertical mounti B3-VV-15-A

Flender/Flender Gear Units/Bevel-helical gear reducers B3

oration of moisture from the product. The airow inside the cabinet is driven by natural convection. The dryer throughput and the drying time are estimated from practice(Table ; however, considerable effort has been made to model solar collector perfor- mance (. The thermal efciencies of solar drying of some fruits were reported to be 1%, 1%, and 1% for apricots, peaches, and apples, respectively (, with highestvalues at the beginning of the drying run. For peaches, for instance, values were 2%,8%, and 3% for the rst, second, and the third drying days, respectively. Very similarvalues of the total thermal efciency of solar drying were estimated by Bansal and Garg(, who calculated the evaporation heat ( ) from the equation /H1 1AI ( where1and2are the thermal efciency coefcients of the solar collector ( and conventional cabinet dryer ( with approximate values of 1/3 for both, Ais the collector surface, and Iis the solar insolation intensity. By multiplying both thermal efciencies 1and2, value of 0.1 or 1% efciency as reported earlier ( can be realized. This is not general value for all solar drying applications. An individual level of this parameter should be estimated in each specic drying process. The quality of the dried product is the most important parameter in the drying tech- nology. Patil ( compared the quality of peppers after sun drying, polyethylene solardrying, and solar cabinet drying. He found that solar cabinet drying offers some advantagesover direct sun drying in terms of better quality and faster rate of drying. Jayaraman andassociates ( compared ascorbic acid retention in cauliower, cabbage, and bitter gourd dried by three different methods: () directly under the sun, () under the sun in black polyethylene tent, and () in drying cabinet with three solar collectors. They reported(Table that the direct exposure of these products to the sun decreased quality factorssuch as vitamin retention. The indirect use of solar energy