Abstract

A mathematical model is presented for studying the techno-economic performance of a hybrid solar air heating system. The configuration of the system consists of a collector-cum-storage system for solar heating of air, an adjuster unit for bringing down the higher air temperature to the desired limit by mixing fresh air in it, and an auxiliary energy source to provide the deficient amount of heat to the air to attain the desired temperature whenever required. In order to evaluate the performance of the system, numerical calculations have been made corresponding to the climatic data of Delhi and the cost parameters prevalent in the Indian market. Numerical results show that the cost of the useful energy obtained for optimized values of collector area and water-depth is much less than the cost of electrical heating.

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