Solar water heater

Evacuated-tube collectors are made up of rows of parallel, transparent glass tubes. Each tube consists of a glass outer tube and an inner tube, or absorber, covered with a selective coating that absorbs solar energy well but inhibits radiative heat loss. The air is withdrawn (“evacuated”) from the space between the tubes to form a vacuum, which eliminates heat loss.

In comparison with flat plate collectors, consisting of weather-proofed box with a dark absorber plate, evacuated tube systems are about 25% or 30% more efficient, and they can even absorb energy from the sun during winter.

Evacuated tubes may be a better solution for homes or commercial applications, such as hotels, motels, laundries, restaurants and car wash.

        

Parameters

Number of vacuum tube: 16 pcs

Vacuum tube length: 1.8 meter

Absorbing area: 2 m2

Daily hot water capacity: 160 liter (for 3-5 persons)

     
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