Idle-sunning resistant flat-plate solar collector

Abstract

The invention discloses an idle-sunning resistant flat-plate solar collector. The idle-sunning resistant flat-plate solar collector comprises an automatic light shading and heat insulating transparent cover plate, a solar absorber plate core, a heat-insulating back panel and a component frame, wherein a layer of temperature-sensitive phase-change dimming material or liquid crystal dimming film is compounded on the surface of the automatic light shading and heat insulating transparent cover plate. The invention has the following technical effects: when the interior of the flat-plate collector reaches a certain temperature due to idle sunning, the temperature-sensitive phase-change dimming material on the surface of the glass is subject to phase change, the transmission of the cover plate of the collector is changed, and the transparent state is switched to a light-tight sate, so that an automatic light shading function is performed, the solar absorber plate core is prevented from continuous heat absorption which results in temperature rise, accordingly, idle sunning is avoided, and the service life of the product is prolonged; and when the collector decreases to a certain temperature, the solar radiation transmission of the cover plate of the collector is changed, the light-tight state is switched to the transparent state, and the normal working state recovers.

Description

technical field [0001] The invention relates to a flat plate solar heat collector. Background technique [0002] During the installation of the solar water heating system, the flat-panel solar collector is inevitably exposed to the sun before the system is injected with the heat-conducting medium. Since the pipeline is not connected to the heat-conducting medium, the heat inside the collector cannot be transferred out of the collector. The heat sink is exposed to the air, causing the temperature of the collector core to rise, which can reach 150 ℃ ~ 200 ℃ in summer, which is easy to cause thermal deformation and carbonization of the insulation board, and oxidation and discoloration of the heat sink, which seriously affects the performance and service life of the product; During the use of the product, due to the long-term non-flow of the heat-conducting medium or poor heat-conducting and other extreme conditions, the collector is easy to be in an air-drying state, and the ai...

AI Technical Summary

Problems solved by technology

[0002] During the installation process of the solar water heating system, before the system is injected with the heat transfer medium, the flat solar collector is inevitably exposed to the sun. Since the pipeline is not connected to the heat transfer medium, the heat inside the collector cannot be transferred out of the collector, and the collector The heater forms an air drying, which causes the temperature of the collector plate core to rise, which can reach 150°C~200°C in summer, which is easy to cause thermal deformation and carbonization of the insulation plate, and oxidative discoloration of the heat absorbing sheet, which seriously affects product performance and service life; During the use of the product, due to the long-term stagnation of the heat-conducting medium or poor heat conduction and other extreme conditions, the collector is easy to be in an air-drying state, and the air-drying makes the heat-absorbing coating separate from the core substrate, which accelerates the aging of the material. Aging, which reduces the light-to-heat conversion efficiency and service life of the collector

At present, flat-panel solar collectors do not have the function of automatic shading and sun protection

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