Carbon black nanometer solar energy absorbent applied to solar water heater

Abstract

The invention discloses a carbon black nanometer solar energy absorbent applied to a solar water heater. The carbon black nanometer solar energy absorbent is prepared from medium water, a pH regulator, nanometer powder and a dispersant. The solar water heater comprises a transparent vacuum glass box for containing the prepared solar energy absorbent and heat conduction water pipes and a feeding opening. Slurry of the prepared solar energy absorbent is added to a glass box body, sunlight transmits the vacuum glass box and is irradiated on the slurry of the solar energy absorbent, nanometer particles dispersed in water absorb the sunlight efficiently by the adoption of the surface effect of the nanometer particles, and the water temperature is increased quickly. The carbon black nanometer solar energy absorbent mainly solves the problems that the wave absorbing gap positions among vacuum pipes are invalid; the selective absorbing materials are evaporated on the surfaces of inner pipes of the vacuum pipes, the solar energy absorption rate is low, the utilization rate is low, and the evaporation process is complex; and the cost is high, the heat dissipation speed is high, and the heat insulation effect is bad in the prior art and achieves the purposes that the efficient absorption and utilization rate of the solar energy reaches 85%-95%, the implementation 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 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 world. The v...

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Problems solved by technology

[0004] The object of the present invention is to provide a carbon black nano-solar absorbing agent applied to solar water heaters, aiming at solving the problem that vacuum tube solar water heaters in the domestic market have a small effective absorption area of ​​sunlight. The water heater’s utilization rate of sunlight absorption is only about 60%; the outer surface of the glass inner tube is coated with a selective absorption coating, thin film or coating with excellent long-term stability by high vacuum reactive evaporation, magnetron sputtering and other technologies. Layer process is more complicated and the cost is higher

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