Vacuum flat-plate heat collector

Abstract

The invention belongs to the field of solar energy application and relates to a vacuum flat-plate heat collector. In the known flat-plate heat collector, only one layer of light-transmitting glass for heat insulation is arranged on a plate core, resulting in poor heat insulation property and low heat efficiency. The vacuum flat-plate heat collector is characterized in that a plate core (3) is arranged in the middle of a full-glass vacuum box body which is formed by glass half-box bodies (1) and a glass cover plate (2), to form a vacuum heat-insulating layer between the plate core (3) and the glass box body. Since the vacuum layer is positioned on and below the plate core, the vacuum heat-insulating effect is improved, the heat loss is reduced, and the heat efficiency of the heat collector is increased. Owing to the vacuum layer which is positioned on the plate core, the temperature of the glass cover plate is reduced and not liable to be broken. In a vacuum environment, the selective absorption coating is not moisturized and has a long service life. The whole box body is made of glass and has a low manufacturing cost. Each of the upper and the lower parts of the box body has only one layer of glass, so that the heat collector is lighter and thinner, convenient to be mounted on a wall and easier to implement building integration.

Description

Technical field [0001] The invention belongs to the technical field of solar energy application, especially solar flat water heaters. Background technique [0002] The solar collector products on the market consist of a box body and a plate core set in the box body. The box body is composed of a half box body (1) and a transparent cover plate (2). The bottom of the box is provided with heat preservation materials, and the plate core ( 3) Consists of copper tubes fixed on the heat-absorbing plate. The transparent cover plate is generally flat glass. Because the plate core is only covered with a layer of glass, the heat preservation effect is poor. Also, because the thermal insulation layer under the core is thick and heavy, it cannot be integrated with the building better; [Solar Energy] magazine published a flat-panel solar collector with the publication number CN101984305A on page 64, Issue 7, 2012. Vacuum glass is used on the upper and lower sides of the board core and the su...

AI Technical Summary

Problems solved by technology

The transparent cover plate is generally flat glass. Since the core is only covered with a layer of glass, the heat preservation effect is poor.

And because the insulation layer below the plate core is thick and heavy, it cannot be better integrated with the building; [Solar Energy] journal published a flat-panel solar collector with a publication number of CN101984305A on page 64 of the 7th issue of 2012. Vacuum glass is used on the upper and lower sides of the board core and the three sides around it. This structure is good for heat preservation, but it uses 5 pieces of vacuum glass, and the cost is high; there is an air layer on the surface of the board core, and the air convection transfers the heat of the board core to the top. The bottom piece of glass of a piece of vacuum glass, when it rains suddenly, the temperature difference between the upper and lower pieces of glass of the same piece of vacuum glass is too large, the edge is easy to break and leak air, which affects the service life; and there is an air layer on the surface of the core. , the selective absorption coating is susceptible to moisture and affects the service life

Recently, there is a product in Italy, the upper and lower parts of the board core are vacuum layers, but the half-box body is made of aluminum alloy. In this structure, the support column under the board core becomes a thermal bridge, which will transfer part of the heat energy to the aluminum alloy. ;The copper tube of the board core will transfer the heat to the aluminum alloy and continuously dissipate the heat; the cost of the aluminum alloy half box is also high

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