Abstract
Solar drying technology has been widely used in engineering fields such us chemical drying because of its low cost and low pollution advantages. In this review, the structural forms, materials and coatings of the heat-absorbing panels of flat plate solar air collector are classified, and the experimental and theoretical results of the performance level of the solar air flat panel collector are summarized. In indoor tests, the energy efficiency of flat plate solar air collector is 30% to 79%, and the energy efficiency of flat plate solar air collector in drying applications is 28% to 62%.
Highlights
As early as 1881, Americans designed and trial-produced the first patented solar air collector
The results show that the herringbone heat-absorbing plate can be used under certain working conditions, the lower heat collection efficiency can be increased by 20%, and the outlet temperature can be increased by 10%
Within 32h, the moisture content (MC) of the pepper drops from 90% to 10%, the efficiency of Double-pass solar drier (DPSD) and a typical cabinet drier (CD) and traditional outdoor sun drying equipment They are 62%, 22% and 24%, respectively
Summary
As early as 1881, Americans designed and trial-produced the first patented solar air collector. We mainly studied and discussed the heat collection efficiency of flat plate solar air collector that greatly increases the heat transfer area due to the existence of fin absorbers, corrugated surfaces and porous media. It introduces the application of solar air flat panel collectors in drying, as well as suggestions and future research trends on the application of solar collectors in the field of drying. The flat-plate solar air collector is mainly composed of a transparent cover plate, a heat absorption plate, an insulating layer, etc It has the characteristics of simple structure, reliable operation, suitable cost, and large heat absorption area, making it the best choice for the chemical drying field. The commonly used flat-plate solar air collectors are shown in the figure
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