What size solar water heater does a 20-room hotel use?

Solar energy+air energy: 300 vacuum tubes, 3P mainframe with 3 tons water tank.

Working principle:

Sunlight passes through the first glass layer of the heat absorption tube and shines on the black heat absorption layer of the second glass layer to absorb the heat of solar energy. Because the two glasses are vacuum insulated, the heat transfer will be greatly reduced, and most of the heat can only be transferred to the water in the glass tube.

The water in the glass tube is heated, and the heated water becomes lighter, which rises along the heating surface of the glass tube and enters the heat preservation water storage bucket. The water with relatively low temperature in the bucket enters the glass tube along the backlight surface of the glass tube for replenishment, and the water in the heat preservation water storage bucket is continuously heated, thus achieving the purpose of hot water.

Extended data:

Component: heat collector.

Heat collecting elements in the system. Its function is equivalent to the electric heating tube in the electric water heater. Different from electric water heaters and gas water heaters, solar collectors use the radiant heat of the sun, so the heating time can only be when the solar irradiance reaches a certain value.

At present, all-glass solar vacuum collector tubes are the most common ones in China market. The structure is divided into an outer tube and an inner tube, and the outer wall of the inner tube is coated with a selective absorption coating. The flat plate collector is coated with heat absorbing film such as black chromium, and welded with metal tube, so the flat plate collector is slightly more expensive than the vacuum tube collector.

In recent years, flat plate collectors are on the rise, especially balcony solar water heaters in high-rise residential buildings. All-glass solar collector vacuum tube generally adopts high borosilicate 3.3 superhard glass, and the selective heat absorption film adopts vacuum sputtering selective coating process.

Baidu encyclopedia-solar water heater