Abstract
Because the flat air collector is simple in structure, reliable in operation, and resistant to cold and frost, it is more suitable for applications such as building heating. This paper presents a flat air collector with a mesh heat sink, and analyzes the effects of air flow, temperature difference between inlet and outlet, and wire mesh density on the heat collection efficiency of the collector. The results show that when the pore density is fixed, the heat collection efficiency increases with the increase of air flow rate, which is 10% higher than that of natural convection when the air flow rate is maximum; when the air flow rate is fixed, the heat collection efficiency increases with the increase of the pore density and the temperature difference between the inlet and outlet, which can be increased by 10% -20%.
Highlights
In order to analyze the performance of the collector, this paper studies the influence of different air flow, temperature difference between the inlet and outlet, wire mesh density and other factors on the collector efficiency
The amount of solar energy is calculated according to the inlet and outlet temperature of the collector, and the heat collection efficiency of the collector is obtained
The heat collection efficiency is calculated by the following formula (1):
Summary
The collector is composed of plexiglass plate, steel wire mesh, steel plate, and insulation board. The collector is provided with 3 layers of steel wire mesh, and the light-transmitting surface is provided with 2 glass cover plates, and the remaining surface is covered with a thermal insulation plate. The plexiglass plate is made of PAMA and has a thickness of about 2.8mm, The steel wire mesh and the underlying steel plate are painted in black, and the heat preservation plate is made of polystyrene crystal with a thickness of about 5cm. 1-Glass plate; 2-Wire mesh; 3-Insulation Materials; 4-shell 5-Air Inlet; 6-Air outlet; 7-Steel plate. The basic working principle of the collector, the sun first hits the first layer of wire mesh through the glass cover. The air entering from the air inlet is heated by the wire mesh and flows out from the air outlet, which can be used for indoor heating
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