Novel solar heat collector with net wires

Abstract

The invention relates to a novel solar heat collector with net wires, which comprises a casing body, a heat-preservation heat insulating layer, a transparent cover plate and a sealing component, wherein the heat-preservation heat insulating layer is stuck at the inner wall of the casing body, and the transparent cover plate is connected with the casing body by using the sealing component so as to form a hollow cavity. The novel solar heat collector with the net wires is characterized by also comprising a heat absorbing body with net wires, wherein the heat absorbing body with the net wires is arranged on the bottom heat-preservation heat insulating layer in the hollow cavity, which is opposite to the transparent cover plate. The heat absorbing body with the net wires comprises a metal net and a metal wire layer. The heat absorbing body with the net wires can comprise a layer of metal net and a layer of metal wire layer and can also comprise two layers of metal nets at the upper part and the lower part and a layer of metal wire layer clamped in the middle, and the metal wire layer is formed by evenly laying bulk metal wires. The novel solar heat collector with the net wires has higher sunlight absorption efficiency and higher photo-thermal conversion efficiency. The convective heat loss and the radiative heat loss can be reduced, the processing difficulty is small, and the cost is low.

Description

technical field [0001] The invention relates to a solar heat collector, in particular to a solar heat collector using a mesh heat absorber. Background technique [0002] The existing popular flat-plate solar collectors, the heat absorbing body is a heat absorbing plate, the material of the heat absorbing plate is metal, plastic, rubber, ceramics, etc., and the structure has pipes and headers. , There is a coating on the heat-absorbing plate. The coating is divided into non-selective coating and selective coating. The processing technology of the coating includes vacuum coating, anodized coating, etc. [0003] The coating material of the heat absorbing plate plays a very important role in absorbing solar radiation energy. Because the wavelength of solar radiation is mainly concentrated in the range of 0.3-2.5 μm, while the thermal radiation of the heat-absorbing plate is mainly concentrated in the wavelength range of 2-20 μm, to enhance the absorption capacity of the heat-ab...

AI Technical Summary

Problems solved by technology

[0004] Despite the adoption of these technical means, flat-plate solar collectors still cannot overcome the problems of relatively small heat absorption area and large heat loss.

First, the heat-absorbing area is limited, and the volume of the collector limits the area of ​​the heat-absorbing plate, thereby limiting the heat-absorbing area, and the volume of the solar collector cannot be infinitely increased

Secondly, the convective heat loss and radiation heat loss are relatively large, and the heat absorption efficiency is not high

Although the use of selective coating improves the heat absorption efficiency of the heat absorbing plate, when the temperature of the heat absorbing plate rises, the air convection heat loss and radiation heat loss will also increase. Only by improving the material of the heat insulation layer, or Thicken the glass cover and add transparent honeycomb to reduce heat loss

Furthermore, the light-to-heat conversion efficiency is greatly affected by the material and structure of the heat-absorbing plate. In order to improve the conversion efficiency, only expensive materials and complex structures can be used. The processing cost is high and the processing is very difficult.

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