Si3N4 nanometer solar energy absorption agent applied to solar water heater

Abstract

The invention discloses an Si3N4 nanometer solar energy absorption agent applied to a solar water heater. Nanometer solar energy absorption agent slurry is mainly prepared from medium water, a pH adjustment agent, nanometer powder and a dispersing agent. The solar water heater comprises a transparent vacuum glass box used for containing the prepared solar energy absorption agent and a heat conduction water pipe, and a feeding inlet, and the prepared solar energy absorption agent slurry is added into a glass box body through the feeding inlet. The problems that in the prior art, invalid wave-absorbing gap positions exist between vacuum pipes, the surfaces of inner pipes of the vacuum pipes are provided with selective a wave-absorbing material in an evaporation mode, the solar energy absorption rate is low, the utilization rate is low, the evaporation process is complex, cost is high, heat radiation is fast, and the heat insulation effect is not good are solved. By means of the Si3N4 nanometer solar energy absorption agent applied to the solar water heater, the efficient absorption utilization rate of solar energy is up to 85-95%, the realization process is simplified, and the cost is low.

Description

technical field [0001] The invention belongs to the field of solar water heater heat collection systems, in particular to a Si 3 N 4 Nano solar absorber. 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 vacuum tube solar water heater is composed of: hea...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of Si that is applied to solar water heater 3 N 4 The nano solar absorber is designed to solve the problem that the current domestic market has a small effective absorption area of ​​sunlight for vacuum tube water heaters. Under the same lighting area and sunlight intensity, the utilization rate of vacuum tube solar water heaters for sunlight absorption is only about 60%. ; On the outer surface of the glass inner tube, high vacuum reaction evaporation, magnetron sputtering and other technologies are used to plate selective absorption coatings with excellent long-term stability. The film or coating process is relatively complicated and the cost is high.

Images