Analysis of Open Sun Drying Experiments

Abstract

ANALYSIS OF OPEN SUN DRYING EXPERIELBNTS lnulet, A.; 2~erna, A.; 3~osse116, C. and 3~a~ellas, J.Open sun drying has lost its previous importance due to the fact that different factors affect its reliability and the quality of the products obtained.One of the set-backs for the analysis of solar drying experiments is their dependence on a non-controlled source of enerw, i.e. solar radiation de~ends on climatic conditions and 2 . . experiments are difficult to compare. It is thus necessary to investigate the advantages of a particular set up as w l l as the climatic influences. Open sun drying could constitute the natural reference, allowing the comparison of different drying strategies.A new way of standardizing drying times, baaed on solar radiation input, is proposed, to allow better evaluation of the exDeriments. An eauivalent time is defined. allowincl comnarison of experiments carried out under different circumstances. Carrots and potatoes were used in these experiments.The use of the average daily solar radiation 15.28 MJ m-2.d-1 in Palma de nallorca (39.33-N, 2.37°E), is proposed for comparison purposes. An improvement of more than 12 % in the explained variance was observed, the unexplained variance being lower than 1 % .

Review on Solar Drying in Nigeria

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Solar dryer efficiency considering the total drying potential. Application of this potential as a resource indicator in north-western Argentina

“…Some authors have proposed different definitions of solar dryer performance trying to deal with these difficulties. Mulet et al (1993) defined a pattern to compare the performance of solar dryers in different locations and proposed the open sun drying as a natural reference but using a standardizing time based on solar radiation collected to obtain drying curves to allow better evaluation of the experiments carried out under different circumstances. Jannot and Coulibaly (1998), defined a performance index (the "evaporative capacity"), that is understood as the maximum drying rate at which water can actually be extracted by the air mass flow that comes from a solar collector.…”

Performance evaluation of photovoltaic thermal greenhouse dryer and development of characteristic curve

“…It is not to be marketable in domestic and international market. [3][4][5][6][7][8] There are four major drying techniques, namely: open air sun drying, firewood/fuel drying, electrical drying, and solar drying. [9][10][11] In order to improve traditional drying, solar dryers, which have the potential of substantially reducing the above-mentioned disadvantages of open air sun drying, have received considerable attention over the past 20 years.…”