The basic structure of flat solar collectors
Flat solar collectors mainly by the heat board, transparent cover, insulation materials and shells and other components.
When the plate collector work, the solar radiation through the transparent cover, the projection on the heat sink, the absorption plate is absorbed and converted into heat, and then heat transfer to the heat transfer plate within the heat transfer medium, so that transmission The temperature of the heat medium is increased as the useful energy output of the collector. At the same time, the heat absorbing plate after the temperature is inevitably radiated to the surroundings through conduction, convection and radiation, and becomes the heat of the heat collector loss.
(1) heat absorption plate
The heat absorbing plate is a component of a flat solar collector that absorbs solar radiation and transfers heat to the heat transfer medium. In the flat-shaped heat-absorbing panels, usually arranged with a row of tubes and header. The piping refers to the components in which the upper and lower ends of the heat absorbing panels are connected to a plurality of rows of tubes and constitute a fluid passage.
There are many kinds of materials, including copper, aluminum alloy, copper and aluminum composite, stainless steel, galvanized steel, plastic, rubber and so on.
(2) transparent cover
The transparent cover plate is a plate-shaped component of a flat panel solar collector plate with a plate cover heat absorbing plate and composed of a transparent (or translucent) material. Its function has three main. One is through the solar radiation, so that it projected on the heat board; the second is to protect the heat board, so that it is not dust and rain and snow erosion; Third, the formation of greenhouse effect, to prevent the heat board after the temperature rise Convection and radiation to the surrounding environment.
There are two main types of materials for transparent cover plates: flat glass and glass plate.
(3) insulation layer
The insulation layer is a component of a flat solar collector that suppresses heat dissipation of the heat sink through the conduction to the surrounding environment.
Materials for the insulation layer are: rock wool, mineral wool, polyurethane, polystyrene and so on. Thermal conductivity of the material should not be greater than 0.055W / (m. K), so the above several materials can meet the requirements. Currently used more rock wool.
The enclosure is a component of a flat panel solar collector that protects and secures the heat sink, transparent cover and insulation.
Materials for the shell are: aluminum alloy plate, stainless steel plate, carbon steel plate, plastic, glass steel and so on. In order to improve the sealing of the shell, the company's products have been used aluminum alloy sheet molding process.