Abstract
Abundant availability of solar energy and fast depleting fossil fuel reserves have necessitated deployment of large scale solar thermal systems for meeting the space heating, process heating and drying requirements. Researchers worldwide have focused on developing energy efficient dryer capable of enhancing product quality, reduced drying time, high throughput, minimal pre-treatments prior to drying with less energy loss in cost effective way. The present paper surveys literature on performance enhancement studies on solar dryer with a thrust on energy efficiency improvements in solar air collector and a multipurpose solar drying system. The effect of adoption of absorber plate with different types of fins, design modifications, CFD based optimization techniques and incorporation of storage materials have been reviewed. A dual-purpose solar water heating and drying system with phase change material (PCM) is suggested for effective harnessing of solar energy.
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