Total: $0.00

Solar Water Heater Tubes, 1.8 meter/58 mm, box of 10


Solar Water Heater Vacuum tubes

1.8 meters long/58 mm diameter, 10 per box

Shipping Open Ended Tubes 
Using Solar Vacuum Tubes

Heat absorbing solar water heater vacuum tubes
99% heat absorption efficiency
Lifetime greater than 10 years
Vacuum ensures no heat loss
Withstands 1/4 inch hailstones
Double walled evacuated tubes

High efficiency glass tubes may be used with metal heat pipes and fin inserts or passive solar water heaters that circulate water directly in the evacuated tubes. Solar energy is trapped on the black absorber surface, which is deposited on the inner glass using thin-film technology. The heat on the inside of the tubes is transferred to either water filling the tube, or metal heat pipes, as installed. A vacuum between the inner and outer glass tubes prevents heat energy from being conducted away to the outside environment. Outside air temperature is almost irrelevant. The vacuum that separates the absorption surface from the outside environment eliminates conductive or convective heat transfer.

Maximum Service Temperature: 95 C (203 F)
Length (nominal): 1800 mm (70")
Outer tube diameter : 58 mm (2.2")
Inner tube diameter: 47 mm (2.1")
Glass thickness: 1.6 mm (0.1")
Thermal expansion: 3.3x10-6 oC
Material: Boro-silicate Glass 3.3
Absorptive Coating: Cu/AL/SS/N2
Transmission Through Glass: >92% (AM1.5)
Absorptivity Coefficient: > 94%
Emittance: < 7%
Vacuum: P< 5x 10-4 Pa
BTU Output Per Day (standard) 1450 BTU/tube
Average system Efficiency: 71% with heat pipes
Estimated Lifespan 25-30 Years
Weight (tubes with frame): 7 lbs each, glass only

3 box 10 Agassiz, 20 Palmdale

1.8 meter/5.9 foot
58 mm
4 kg (8.8 lb)