Three target vacuum tube assimilate advanced 12 layers of spattering deposition of trivalent element technology to make tube has high performance of absorptance and low reflection ratio
Structure of solar vacuum tubes as same as gallbladder of pot, which sealed with double glass and double glass tube pumped into high vacuum
Surface of inner glass sprayed with selective coating through special technology
Solar energy absorption rate can reach 96% by usage of selective coating, while rate of thermal radiation below 4%
Vacuum tube absorbs solar energy and then heats water or liquid by heat conduction
Heat loss of liquid very low through high vacuum between inner glass tube and outside
Widely used in solar water heater, collectors and projects
Works in cloudy days
Outer diameter and inner diameter: 47/37 or 58/47mm
Note: Not all certifying agents offer online lookup, and some have a lag time for posting new certificates. If you are unable to find a certificate online, contact the certification agency or supplier for further verification.
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