SunSiphon Thermosiphon Unit
 Cutaway of Open-Loop SunSiphon SystemThe world's finest thermosiphon storage tank and rugged, high performance flat plate solar collectors. The SunSiphon is available in both open-loop and jacketed closed-loop configurations to serve in any climate. (In Cold Climates it is used with "heat exchange" - In Mild Climate it is used without "heat exchange".)---------------------------------------------------------------------------------------------------------------------------------------------------
Model Number Collectorl No. of Overall Width Overall Length Collector Area Max Pressure Total Wet Weight
Model Collectors (inc) (in) (Sq. Ft.) (psig) (Psig)
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EPGX48-21 EP21 1 48 98 21.21 150 564
EPGX48-24 EP24 1 48 120 24.61 150 572
EPGX48-32 EP32 1 48 120 32.79 150 602
EPGX80-40 EP40 1 75 144 40.81 150 941
EPGX80-42 EP21 2 82 98 42.42 150 946
EPGX80-48 EP24 2 75 120 49.22 150 963
EPGX80-63 EP21 3 122 98 63.63 150 1,022
EPGX80-64 EP32 2 98 120 65.58 150 1,021
EPGX116-63 EP21 3 123 98 63.63 150 1,388
EPGX116-64 EP32 2 108 120 65.58 150 1,389
EPGX116-80 EP40 2 108 144 81.62 150 1,480
 A Thermosiphon unit is a completely passive design that relies on buoyancy effects to circulate fluid through the collectors as opposed to the pumps and controllers found in active systems.
When sunlight strikes the collectors in the SunSiphon system it heats the food-grade antifreeze within them, which then rises due to buoyancy into the jacket-style heat exchanger on the bottom of the storage tank. Here the antifreeze transfers heat into the tank, becomes cooler, and sinks to the bottom of the collectors to repeat the process.
During periods of no sun, the cool fluid in the base of the collectors is not heated, does not rise, and thereby stops circulation of the antifreeze. In this manner, thermosiphon units achieve the operational characteristics of active systems but without the pumps and controls |
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