Disc Stirling engine heat collector port heat shield device and application thereof in solar power generation

Abstract

The invention relates to a disc Stirling engine heat collector port heat shield device and application thereof in solar power generation. The disc Stirling engine heat collector port heat shield device comprises a cylindrical heat collection cavity formed by heat-insulation components, wherein the bottom of the heat collection cavity is sealed; the inner side of the bottom is provided with a heat absorption component; the mouth of the heat collection cavity is formed by the butt joint of the small ports of two cone-shaped bodies; a big port of the cone-shaped body on the inner side is connected with the heat collection cavity; the junction of the small ports of the two cone-shaped bodies is provided with a round heat shield to seal the heat collection cavity, wherein the round heat shield is used for reflecting sunlight which enters the heat collection cavity but is not absorbed, and the convective heat exchange of a heat collector and atmospheric environment is inhibited. The reflection to the radiation energy of the heat collector is effectively enhanced, the convective heat exchange of the heat collector and atmospheric environment is completely inhibited due to the heat shield, lost heat from the heat collector port to external space can be effectively reduced, and the optothermal conversion efficiency of the engine heat collector is improved.

Description

technical field [0001] The invention belongs to the field of solar power generation, and in particular relates to a heat shield device at the collector port of a disc Stirling engine and its application in solar power generation. Background technique [0002] The Stirling engine is a high-efficiency thermal power conversion device. Theoretically speaking, the efficiency is equivalent to that of the Carnot cycle, and it is a closed cycle with no pollution and low noise. It is more and more favored by everyone. Applying the Stirling engine to the field of solar power generation, there is a problem of light-to-heat conversion, so how to improve the light-to-heat conversion efficiency is particularly important. [0003] A schematic diagram of the structure of the collector port of a current disc Stirling engine is as follows Figure 4 As shown, it is a heat collecting cavity with a cylindrical structure. The sunlight is incident from the mouth 4 and directly illuminates the heat...

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Problems solved by technology

The first two items are related to the temperature of the heat-absorbing part. The heat loss of the first two items is about 0.5kW and 6kW respectively according to the rated operating temperature, while the third item of heat loss is related to the absorption rate of the heat-absorbing part to sunlight. The lower the temperature, the greater the loss. According to the calculation of existing materials, the loss is about 15kW, and there is no device or method that can well solve the third heat loss.

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