Vacuum solar collector is a solar energy converter that collects and absorbs solar radiation in any weather and at any temperature. The coefficient of energy absorption by this converter is 98%. As a rule, it is installed on the roof of the house . The angle of inclination during installation can be from 5 to 90 degrees.
The design of vacuum tubular solar collectors resembles the thermos principle. Two tubes with different diameters are inserted into each other, and a vacuum medium is created between them, which provides perfect thermal insulation. If the system is all-season, it uses thermal pipes - closed copper pipes with a small content of easy-boiling liquid.
The operating principle of a vacuum solar collector
As it became clear, the key point of this solar system is a vacuum tube for a solar collector, consisting of two glass flasks.
The outer tube is made of durable borosilicate glass, capable of withstanding hail impacts. The inner flask is also made of a similar glass, but is additionally covered with a special three-level coating, which is designed to improve the efficiency of the tube.
The air between the two tubes prevents heat loss and reverse thermal conductivity. In the middle of the bulb is a hermetic heat pipe made of red copper, and in the middle there is an ether, which, after heating, transfers heat to the antifreeze.
When the waves of solar radiation penetrate borosilicate glass, their energy is retained on the second flask with a layer of absorber applied to it. As a result of such energy absorption and its subsequent radiation, the wavelength increases, and the glass does not let a wave of this length. In other words, the solar energy is trapped.
The absorber is heated by solar energy and starts itself
The vacuum solar collector is capable of producing an average power of 117.95 to 140 kW / h / m2 sup2. And this is only from the use of one tube. On average, 24 hours a day, the tube generates 0.325 kW / h, and on sunny days - up to 0.545 kW / h.