Performance evaluation of a modular solar dryer
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Performance evaluation of a modular solar dryer



A numerical and experimental study of an indirect forced convection solar drying system is presented. This system is composed of an air flat plate collector, an auxiliary heater and a drying cabinet. The modeling and the simulation of the functioning of this dryer are performed using the TRNSYS software and numerical codes that we have developed for modeling the drying process. The expressions of the drying air velocity, the characteristic drying curve (C.C.D) and the effective diffusion coefficient used in computations were deduced from drying experiments performed at different drying air velocities. Simulations are carried out for thin layers of bay Leaves, a drying duration equal to the sunshine one and the meteorological data of Algiers (Algeria) using the notion of a typical day. Economic aspects are taken into account in order to determine the technical and economic feasibility of this drying system. We analyze the effects of the air mass flow rate, the drying air temperature, the collector area and the recycled air fraction on the efficiency of the dryer. A simple design method based on semi-empirical correlations of the solar fraction as a function of a dimensionless parameter, defined by the ratio between the average daily solar radiation received by the collector and the average daily requirement energy for drying, is proposed.



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Published 01 July 2015
Reads 13
Language English
Document size 2 MB