Efficiency Breakthrough
Sisyan’s collectors and tank form a water-filled drainback system.
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No damage from overheating, so systems can be sized for higher solar fractions. If the maximum heat has been collected, the system drains and there is no harm to the solar fluid, unlike with closed-loop antifreeze systems.
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High efficiency and low cost, because the solar fluid is water.
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Appropriate even in colder climates due to the array’s unique freeze tolerance.
The diagrams at right illustrate three ways to access the heat stored in the tank: Open Loop, Internal Heat Exchanger, and External Heat Exchanger. Each system must be customized for site-specific conditions.
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