AbstractSolar energy can be turned into other forms of energy directly and indirectly. The simplest and most efficient of these is converting it into thermal energy using solar collectors. The aim of this paper is to increase the flat air collector’s efficiency using a variety of arc-shaped deflectors. For this purpose, three kinds of solar collectors were studied, differing from each other in the presence or absence of deflectors and also in their arrangement. Collector type SC110 was used without a deflector, type SC111 was fitted with a 4 cm-wide arc-shaped deflector, and type SC112 with a 7 cm-wide arc-shaped deflector, but they all had different latitudinal and longitudinal distances. The distance in collector type SC111 was 6 cm, and 9 cm in collector type SC112. 16 thermal LM35 sensors were used at different points of the collector. The pressure drops of these collectors were measured by a U-shaped water differential monometer. In order to carry out experiments and relevant tests, data collection was conducted in the exterior area of the Agricultural Faculty of Tabriz University, with a single-walled glass cover. The results showed that the greatest difference between the average input and output temperature in the single-walled glass collectors was in type SC112, SC111 and SC110, respectively. The highest output temperature was noted in collector type SC112. The average temperature of the absorber plate for collector type SC110 was higher than the other two types of collectors. In this study, the highest efficiency was achieved with collector type SC112 with 48.75%, and the lowest efficiency was noted in collector type SC110, at 43.95%.
Keywords: Absorber Plate, Collector Efficiency, Roughened Plate, Solar Air Collector.