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The low pressure gravity feed complete system consists of a vacuum glass tube collector, an insulated storage tank and optional stand parts (make up tank). The evacuated glass tubes are filled with water and exposed to sun, thus heating up the water in the glass tubes.
As the specific gravity of cold water is heavier than hot water, the hot water in the glass tubes starts rising in the insulated water tank, and the cold water in the insulated water tank sinks into the glass tubes. As this cycle is repeated, water in the solar water heater gets heated. This process is known as Thermosyphon and is based on natural convection.
As the specific gravity of cold water is heavier than hot water, the hot water in the glass tubes starts rising in the insulated water tank, and the cold water in the insulated water tank sinks into the glass tubes. As this cycle is repeated, water in the solar water heater gets heated. This process is known as Thermosyphon and is based on natural convection.
| Diameter of Tube | 47 mm |
| Length of Tube | 1500 mm |
| Absorption | 0.94 ~ 0.96 |
| Emittance | 0.04 ~ 0.06 |
| Inner/Outer Diameter of Tank | 375/475 mm |
| Insulating Layer | Foaming polyurethane, Thickness: 50mm, ?=36kg/m³, K=0.0035w/m.k |
| Outer Tank | Painted steel -0.4mm/Aluminum-zinc coated steel-0.45mm/Stainless steel SUS304 |
| Inner Tank | Stainless steel SUS304-0.5mm |
| Inlet/Outlet Pipe | 1/2 |
| Sealing Rubber | 110 Methylsilicone Rubber with Vinyl |
| Dustproof Rubber | EPDM |
| Tail Stock | ABS Plastic material |
| Frame | Coated galvanized steel sheet-1.5mm/Stainless steel SUS430-1.5mm |
| Reflector | Aluminium component: AL 99.85% Surface oxidation treatment/SS |
| Frame Angle | 30º/45º |
| Daily Efficiency | > 70% |
| Heat Loss Coefficient | 10w/m².k |
| Stagnation Temperature | < 100 |
| Optional Electric Heater | 1500W/220V |
HOW DOES THE GRAVITY FEED SYSTEM WORK?
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SESSA is a non-government, non-profit organization representing the renewable energy sector in Southern Africa.
Genergy systems have passed SABS SANS 6211-1:2003
Genergy is a member of SESSA (Sustainable Energy Society of Southern Africa)