A solar heat absorber for light-to-heat conversion in a closed chamber

Abstract

The invention discloses a solar heat absorber capable of carrying out photo-thermal conversion in a closed chamber. The solar heat absorber is in a two-layer structure consisting of a heat absorber outer casing and a heat absorber inner casing, wherein the bottom end of the heat absorber inner casing downwards stretches out of the heat absorber outer casing through an inlet flow guide tube, and acts as a cold working medium inlet; the top end of the heat absorber inner casing upwards stretches out of the heat absorber outer casing through an outlet flow guide tube, and acts as a hot working medium outlet; the heat absorber outer casing is externally provided with light accepting heads; solar rays collected by a light collection system are guided and shot into an outer chamber via a light guide cable by the light accepting heads, are illuminated on the outer wall surface of the inner casing, and are absorbed by a heat absorption coating layer to produce high temperature; and a few part of rays reflected by the outer wall surface of the inner casing are reflected by a reflecting layer at the inner wall of the outer casing, finally fall on the heat absorption coating layer at the outer wall of the inner casing, and are absorbed completely. Whether the flow guide tubes are opened with holes and are communicated with the outer chamber is decided according to the property of a heated working medium.

Description

technical field [0001] The invention belongs to the technical field of solar heat collection and power generation, and in particular relates to a solar heat absorber for photothermal conversion in a closed chamber. Background technique [0002] With the continuous depletion of fossil energy and the continuous improvement of people's requirements for environmental protection, the pace of development of renewable energy is accelerating. Among them, solar energy, as a clean and pollution-free renewable energy with great development potential, is gradually getting people's attention. Solar power generation is one of the most important forms of solar energy development and utilization. At present, solar power generation technologies mainly include photovoltaic power generation and solar thermal power generation. Among them, whether photovoltaic power generation adopts single crystal silicon or thin film technology, there is a problem of low photoelectric conversion efficiency. , ...

AI Technical Summary

Problems solved by technology

The higher the temperature of the metal outer wall, the greater the external radiation heat loss. In addition, the heat absorber arranged on the high tower is affected by the high-altitude wind, and the convective heat exchange with the air is also very strong, so the heat loss of the heat absorber is very large. High, the efficiency drops, hindering the improvement of the overall power generation efficiency

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