Explain the working principles of Solar Air Heating Systems

Solar air heating systems are designed to capture solar energy and use it for heating air, which can then be circulated for various applications like space heating, drying, or ventilation. These systems are widely used in residential, commercial, and industrial settings due to their energy efficiency and environmental benefits. The working principle of solar air heating systems revolves around three main processes: collection, conversion, and distribution of solar energy.

The first step in the process is the collection of solar energy. Solar air heating systems typically consist of solar collectors, which are installed on rooftops or in areas with direct exposure to the sun. These collectors are usually flat-plate collectors or evacuated tube collectors. In the case of flat-plate collectors, they are made of a blackened metal surface, often aluminum or copper, which absorbs solar radiation. This metal surface is typically enclosed in a transparent cover made of glass or _____ ________ _________ ________ _______ _______ ________.
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