Evacuated tubes are the absorber of the solar water heater. They absorb solar energy converting it into heat for use in water heating. Evacuated tubes have already been used for years in Germany, Canada, China and UK. There are several types of evacuated tubes in use in the solar industry. At Sunlit, we use the "Twin-Glass Tube" technology. This type of tube is chosen for its reliability and better performance.
| Absorber | Evacuated Glass Tubes |
| Tube Length | 1800 mm |
| Tube Diameter | 58 mm |
| Glass Thickness | 1.6 mm |
| Material | Borosilicate Glass 3.3 |
| Absorptive Coating | Graded CU-N / CU |
| Absorptance | >92% (AM1.5) |
| Emittance | <8% (80oC) |
| Stagnation Temperature | >200oc |
| Inner Tank | Stainless Steel 304-L / Copper |
| Inner Tank Welding | Seam Welding / Gas Welding |
| Turbulence Preventer | Provided |
| Deep Drawn Dishes | Provided |
| Outer Tank | Coated Sheet |
| Tank Side Dish | Aliminum Power Coated |
| Heat Retention | 72 hours |
| Insulation | PUF |
| Electrical Backup | Provided ISI make (Optional) |
| Supporting Stand | GI PU Coated |
| Model | 100 LPD | 150 LPD | 200 LPD | 250 LPD | 300 LPD | 500 LPD |
| No. of Tubes | 10 Nos |
15 Nos |
20 Nos |
25 Nos |
30 Nos |
32 Nos |
| Tube Size | 58mm x 1800mm |
58mm x 2100mm |
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| Heater Coil | Optional |
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| Utility Points | 1-2 |
3 |
4 |
5 |
6 |
8 |
| No. of Persons | 3-4 |
5-6 |
6-8 |
8-10 |
10-12 |
12-15 |
| Temperature | 50-60 Deg. C |
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| Inner Tank | Stainless Steel 304-L/Copper |
| Inner Tank Welding | Seam Welding/Gas Welding |
| Turbulence Preventer | Provided |
| Deep Drawn Dishes | Provided |
| Outer Tank | Stainless Steel 430 Grade / Coated sheet |
| Tank Side Dish | Aluminum Powder Coated |
| Heat Retention | 72 hours |
| Insulation | PUF |
| Electrical Backup | Provided ISI Make (Optional) |
| Supporting Stand | MS Epoxy Coated |
| Capacity | No.of Persons | Utility Points |
|---|---|---|
| 100 LPD | 3-4 Persons | 1-2 points |
| 200 LPD | 5-6 Persons | 3-4 points |
| 300 LPD | 6-8 Persons | 5-6 points |
| 500 LPD | 10-12 Persons | 7-8 points |
Focusun Energy Systems is a leading designer and manufacturer of Solar Thermal and Solar Photovoltaic Systems.