Heat collecting plate core and flat-plate type solar thermal collector

Abstract

The invention discloses a heat collecting plate core and a flat-plate type solar thermal collector. The flat-plate type solar thermal collector is characterized by comprising the heat collecting plate core based on a corrugated metal sheet structure, a superconductive hybrid heat transfer working medium, a transparent cover plate, a heat insulating material layer and an outer frame. The flat-plate type solar thermal collector has the characteristics of being compact in structure, high in heat transfer efficiency, small in pressure loss, light in weight, flexible to install, high in pressure bearing performance, resistant to freezing, scaling and corrosion, long in service life, low in cost and the like, and is very suitable for being combined with buildings. The superconductive hybrid heating medium serves as the heat transfer working medium, so that the solar thermal collector still operates normally at low temperature; the heat utilization efficiency is greatly improved; the use range is greatly enlarged; the application ways of the flat-plate type solar thermal collector are widened; the flat-plate type solar thermal collector is widely suitable for solar thermal collection occasions like civil buildings and industrial plants.

Description

technical field [0001] The invention belongs to the technical field of medium and low temperature solar heat collection, in particular to a heat absorbing plate core and a flat plate solar heat collector. Background technique [0002] Flat-plate solar collectors have been widely used in domestic water heating, swimming pool heating, industrial water heating, building heating and air conditioning and many other fields. The flat-plate solar collector is mainly composed of transparent cover plate, heat-absorbing plate core, heat insulation layer and shell frame, among which the plate-type heat-absorbing plate core is the core component of solar heat utilization. [0003] When the flat-plate solar collector is working, the solar radiation passes through the transparent cover and is projected on the heat-absorbing plate core, which is absorbed by the heat-absorbing plate core and converted into heat energy, and then the heat is transferred to the heat-absorbing plate core. The t...

AI Technical Summary

Problems solved by technology

Disadvantages: The welding process is difficult, and it is prone to problems of welding penetration or welding; the pressure resistance is poor, and the solder joints cannot withstand high pressure; the dynamic characteristics are poor, the cross-section of the fluid channel is large, and the heat-absorbing plate has a large heat capacity, large temperature rise

Disadvantages: large contact thermal resistance, low heat conduction efficiency of fins; uneven temperature distribution of plate core along the flow direction of working fluid; large flow resistance and large flow pressure loss of series flow channels; difficult curve welding process

[0009] The core of flat-panel solar collectors usually uses water or acetone as the heat transfer medium. Problems such as its easy freezing and poor operating efficiency at low temperatures have long existed in the solar water heater industry. This technical defect has always hindered the development of flat-panel solar collectors. Heaters are used in winter in temperate regions and in some severe cold regions. Therefore, it is imperative to develop a heat-absorbing plate core and flat-plate solar collector with simple and compact structure, high heat transfer efficiency, small pressure loss, and excellent low-temperature operation performance. Row

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