Complete solar hot water system for climates that do not freeze hard. Same evacuated tubes as other systems, but with water in tube. Low system water pressure operation. 100 liters, 12 tubes.
These high efficiency glass tubes may be used with 1.5 meter heat pipes and fin inserts as well as 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.
A vacuum between the inner and outer glass tubes prevents heat energy from being conducted away to the outside environment, which means that outside air temperature is almost irrelevant to the degree to which the inside the tubes can be heated.
· 99 % heat conduction
· Lifetime greater than 10 years
· Vacuum ensures no heat loss
· Withstands hailstones
These systems can be used in climates with temperatures not much below -5 C, although lower temperatures are possible if there is sun during the day and the heated water is not used overnight. Since water is directly in the tube, efficiency is high. In hard freeze climates (no sun and -20 C, for example), the collector may be drained during the winter.
Þ Highly efficient insulation with polyurethane foam keeps tank heat loss to a minimum
Þ stainless steel storage tank inner cylinder stands 100,000 fatigue tests without any distortion
Þ Long service life, can be used at least 15 years
Þ Simple modular structure of diffuse flat plate reflector makes for easy assembly and installation
Þ Large-scale solar hot water systems can be installed either with parallel or series connections of these units
