Carbon nanotube solar absorbent applied to solar water heater

Abstract

The invention discloses a carbon nanotube solar absorbent applied to a solar water heater. The carbon nanotube solar absorbent is prepared from medium water, a pH regulator, nano powder and a dispersant; the solar water heater comprises a transparent vacuum glass box for containing the prepared solar absorbent, a heat conduction water tube, and a charge hole; the charge hole is used for charging slurry of the prepared solar absorbent into the glass box body; sunlight passes through the vacuum glass box to irradiate the slurry of the solar absorbent; and surface effects of nano-particles dispersed in water are utilized to efficiently absorb sunlight, so that the water temperature is quickly increased. The carbon nanotube solar absorbent mainly solves the problems that invalid wave-absorption gap positions exist among vacuum tubes in the prior art, selective wave absorption materials are evaporated on the surfaces of inner tubes of the vacuum tubes, a solar absorption rate is low, a utilization rate is low, an evaporation process is complex, cost is high, heat dissipation is quick and heat insulating effect is not good. The carbon nanotube solar absorbent realizes efficient absorption utilization (up to 85%-95%) of solar energy, realizes a simplified process and realizes relatively low cost.

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 nanotube 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 vac...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a carbon nanotube solar absorber applied to solar water heaters, aiming at solving the problem that vacuum tube water heaters in the domestic market have a small effective absorption area of ​​sunlight. The utilization rate of solar water heaters for solar 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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