Abstract
The hot air needed in applications such as drying agricultural products and space heating can be obtained with air-heated solar collectors. Air has a lower heat transfer coefficient than water. Using storage materials with increased surface area in air-heated solar collectors provides both obtaining higher temperatures output air and increased the total efficiency of the collector by storing energy. Refractory materials such as fire bricks have low thermal conductivity and high thermal capacities. In this study, the effects of refractory fire-brick fragments which are a kind of refractory in storage and reuse of thermal energy on collector efficiency were investigated. Fire brick fragments of different densities were applied into the solar air heater collector and their thermal efficiencies were compared during under radiation and cooling.
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