Carbon black-graphene nanometer solar absorber applied to solar water heater

Abstract

The invention discloses a carbon black-graphene nanometer solar absorber applied to a solar water heater. The carbon black-graphene nanometer solar absorber is prepared from medium water, a pH regulating agent, nanometer powder and a dispersing agent. The solar water heater comprises a transparent vacuum glass box, heat conduction water pipes and a feed inlet, wherein the transparent vacuum glass box is used for containing the prepared solar absorber. Slurry of the prepared solar absorber is added into the body of the glass box, sunlight irradiates the slurry by penetrating through the vacuum glass box, nanometer particles dispersed in water efficiently absorb sunlight by means of the surface effect, and the water temperature is rapidly increased. The problems that in the prior, an invalid wave absorption gap device is arranged between vacuum pipes, selective wave absorption materials are evaporated on the inner surfaces of the vacuum pipes, the solar absorption rate is low, the utilization rate is low, the evaporation technology is complex, the cost is high, heat dissipation is fast, and the heat insulation effect is poor are solved. Efficient absorption and utilization (reaching 85%-95%) of solar energy are achieved, the realization 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 carbon black-graphene nano 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 worl...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a carbon black-graphene nano-solar absorber applied to solar water heaters. Under the current conditions, the utilization rate of vacuum tube 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 by using high vacuum reactive evaporation, magnetron sputtering and other technologies , the film or coating process is more complicated and the cost is higher

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