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Normally non pressurised systems are working up to 0.8 Kg / Cm2 , The storage tank is placed at a certain height relative to the top of the collector to prevent the reverse circulation during off-sun shine hours. In this system, hot water storage tank can be under normal pressure of cold water overhead tank so gravitational force of overhead cold water tank comes to bottom of hot water tank at normal pressure ( non pressurized), hot water comes out from top of hot water solar tank and release at the end of tap as a regular.
Brand | Eurosolar |
Overall size** | 2030 mm x 1090 mm x 95 mm |
No. of fins per collector | 9 |
Absorber area | 2.06 sq. M |
Absorber coating | Eurosolar Solar selective coating on copper (black chrome on copper with or without nickel undercoat) |
Absorptivity | 0.92 – 0.96 |
Emissivity | 0.10 - 0.15 |
Temperature tolerance of coating | More than 200 deg. C |
Absorber sheet (Copper) | 0.12 mm thick x 1900mm L x 115mm W |
Riser (Copper tube) | O. D. 12.7mm x 0.5 mm thick x 1922mm L |
Bonding between riser tube and absorber | Ultrasonic welding |
Bonding between riser tube and header | Copper brazing |
Riser tube protrusion inside header | Max. 3 mm |
Hydraulic Test pressure | 5 Kg/ sq. cm. |
Rated pressure | 2.5 Kg/ sq. cm. |
End connections | Brass flared Flanges |
Collector box | Specially Extruded Aluminum sections |
Box Corner joints | G. I. screws |
Box-back sheet joint | Pop riveted |
Back sheet | Aluminum sheet 0.45 mm thick |
Reflector | Aluminum foil 0.02/ 0.05 mm thick |
Glazing | Toughened & Tempered glass 4 mm thick - free from bubbles and scratches |
Transmittance | > 0. 82 |
Sealing | Silicone sealant |
Back Insulation | Resin bonded Rockwool 50 mm thick. |
R=1.67 sq. M deg. C/ W | |
K = 0.052W/sq. M. k | |
Side insulation | Resin bonded Rockwool 25 mm thick |
Grommets & gaskets | EPDM rubber |
Thermal performance | FRUL =< 6 W/ sq. M deg. C |
FR ( T& ) >= 0.65
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