Abstract
An experimental study is performed to measure the convective heat losses from a heated solar cavity receiver with an air curtain. The air curtain is a plane jet blowing downward across the aperture to mitigate the convective heat losses. The cavity is placed in an open section of a wind tunnel to provide a controlled environment for measurement of the influence of winds speed of 0 m/s, 6 m/s and 9 m/s on the performance of the air curtain. The velocity of the air curtain was varied from 9 m/s to 18 m/s with two different discharge angles of 0° and 30°. The results show that for a head-on wind condition, the air curtain with a discharge angle of 30° has a better performance than that with a discharge angle of 0°. The use of curtain was found to reduce the natural and mixed convective heat losses between 40% and 66% relative to the case without an air curtain. The heat losses distribution on the surface of the cavity was also measured, which revealed that heat losses are greatest from the lower part of the cavity.
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