SiC nanometer solar energy absorbent applied to solar water heater

Abstract

The invention discloses SiC nanometer solar energy absorbent applied to a solar water heater. The SiC nanometer solar energy absorbent is prepared from medium water, a pH conditioning agent, nanometer powder and a dispersing agent. The solar water heater comprises a transparent vacuum glass box used for containing the prepared solar energy absorbent, heat conduction water pipes and feeding openings, and slurry of the prepared solar energy absorbent is added to the glass box; sunlight penetrates through the vacuum glass box and irradiates into the slurry, nanometer particles dispersed in water efficiently absorb the sunlight through the surface effect of the nanometer particles, and water temperature is raised rapidly. BY means of the SiC nanometer solar energy absorbent, the problems that in the prior art, invalid wave-absorbing gap positions exist among vacuum pipes, surfaces of inner pipes of the vacuum pipes are provided with selective wave-absorbing materials in an evaporation manner, solar energy absorptance is low, the utilization rate is low, the evaporation process is complex, the cost is high, heat dissipation is high in speed, and the heat insulation effect is poor are solved. Efficient absorption and utilization of solar energy are achieved, the absorption and utilization rate reaches 85-95%, the accomplishment process is simplified, and the cost is low.

Description

technical field [0001] The invention belongs to the field of heat collection systems of solar water heaters, and in particular relates to a SiC nanometer solar absorber applied to solar water heaters. Background technique [0002] At present, as the concept of "energy saving and environmental protection" gradually penetrates into people's hearts, clean energy such as solar energy is becoming more and more popular, and the popular solar water heater is a good illustration of this point. A solar water heater is a device that can convert sunlight energy into heat energy and heat water from low temperature to high temperature to meet people's hot water needs in life and production. Common water heaters on the market are divided into structural forms: vacuum tube solar water heaters and flat plate solar water heaters. At present, the most widely used in China is the vacuum tube solar water heater, while the flat plate solar water heater is generally used in the world. The vacuu...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a SiC nano-solar absorbing agent applied to solar water heaters. The utilization rate of solar water heaters for sunlight absorption is only about 60%; the outer surface of the glass inner tube is coated with a selective absorption coating with excellent long-term stability, thin film or The coating process is more complicated and the cost is higher

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