SiC-Si3N4 solar energy absorber applied to solar water heater

Abstract

The invention discloses a SiC-Si3N4 solar energy absorber applied to a solar water heater. The SiC-Si3N4 solar energy absorber applied to the solar water heater is prepared from medium water, a pH regulator, nano-powder and a dispersant; the solar water heater comprises a transparent vacuum glass box which is used for holding the prepared solar energy absorber, a heat-conducting pipe, and a feeding hole; slurry of the prepared solar energy absorber is added into a glass box body; sunlight transmits through the vacuum glass box and irradiates the solar energy absorber slurry, and nano-particles which are dispersed in water absorb the sunlight effectively by utilizing a surface effect of the nano-particles, so that the water temperature is risen quickly. The problems that a wave-absorbing gap position between vacuum tubes is invalid, and a selective wave-absorbing material which is evaporated on the surfaces of inner tubes of the vacuum tubes is low in solar energy absorption rate, low in utilization rate, complex in evaporation process, high in cost, quick in radiating, and poor in heat insulting effect in the prior art are mainly solved. According to the SiC-Si3N4 solar energy absorber applied to the solar water heater, the absorption and utilization rate of the solar energy reaches 85 to 95 percent, an implementation process is simple, 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 SiC-Si used in solar water heaters 3 N 4 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...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of SiC-Si that is applied to solar water heater 3 N 4 The solar absorber is designed to solve the problem that the vacuum tube water heaters in the domestic market have a small effective absorption area of ​​sunlight. Under the same lighting area and sunlight intensity, the vacuum tube solar water heaters only absorb about 60% of sunlight; The outer surface of the inner tube is coated with a selective absorption coating with excellent long-term stability by high vacuum reactive evaporation, magnetron sputtering and other technologies. The film or coating process is relatively complicated and the cost is high.

Images