Double heat exchanger solar water heaters  

Working principles

The main body of pre-heated solar system consists of four parts, vacuum tubes, heat preservation tank, assistant tank and support frame. The chief heat-collected part is the vacuum tubes (infrared-reflection layer, absorbance layer, anti-reflection layer), which are made up of two borosilicate glass tubes using full automatic equipment and advanced international magnetron sputtering technology. The outside of the inner tube is coated with aluminum nitride layer or stainless aluminum nitride, which can endure a temperature up to 350°C. The coating absorbs sunlight exclusively (absorptance≥0.92, emittance≤0.09, 80°C). The vacuum tubes absorb sunlight and convert the solar energy into heat power. Due to the thermo-siphon effect, the hot water in the vacuum tubes flows into the tank and the cold water enters into the vacuum tubes. The circulation repeats and the water in tank become hot. Then when you add cold water in to the copper coil, the water in the tank will heat the water in the copper coil, after the water circulate a circuit ,the water will be heated too.

The water you actually use is the water in the copper coil, it means it is the fresh water (there is no pollution in the water).

Advantages:

1. Use the copper coil as the heat exchanger, according with international fashion trend, it is simple to install and use.

2. It takes the advantage of the tap water’s pressure, more pressure, more comfortable.

3. It can produce hot water with constant temperature, safe and comfortable to use.

4. The water can be heated rapidly, so it can produce the high quality hot water.

5. It can produce more hot water than the general types because it isn’t restricted by the volume of the tank.

6. With the assistant tank, cold water adds automatically.

7. The water you actually use is the water in the copper coil, it means it is the fresh water (there is no pollution in the water)