Solar FPC Non Pressurised

Non Pressurised
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.
Technical Specifications of Collector
Technical Specifications of Collector :
Brand "Uratom"
Overall size 2030 mm x 1030 mm x 95 mm.
No. of fins per collector 9
Absorber area Appro. 2.06 sq. M
Absorber coating Selective coating on copper (black chrome on copper)
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 155mm W

Riser (Copper tube)

O. D. 12.7mm x 0.5 mm thick x 1922 mm L

Bonding between riser Tube and absorber

Ultrasonic welding

Bonding between riser Tube and header

Copper brazing

Hydraulic Test pressure

Rated pressure

2.5 Kg/ sq. cm.

End connections

Brass flared Flanges of threaded 1" BSP

Collector box

Specially Extruded Aluminum sections

Box-back sheet joint

Pop riveted

Back sheet

Aluminum sheet 0.71 mm thick


Aluminum foil 0.02 / 0.05 mm thick


Toughened glass 4 mm thick-free From bubbles and scratches


> 0.82


Silicone sealant

Back Insulation

Resin bonded Rockwool 50 mm thick.

Side insulation

Resin bonded Rockwool 25 mm thick

Grommets & gaskets

EPDM rubber

Technical Specifications of Tank
Technical Specifications of Tank :
Capacity Equal to system capacity
Material SS 304 Non magnetic stainless steel or epoxy coated G.I. 
Welding TIG welding (Argon inert gas welding) for SS304
Thickness Suitable for tank capacity
Insulation Glasswool sheets 100 mm thick
Cladding PP Powder-coated G.I. sheets / Aluminum Cladding
Back up Electrical coil of 2 KW (Optional)
Pressure rating 0.8 Kg/ sq. cm. for normal systems; 3.5 - 5 kg/sq. cm. for pressurized systems
Advantages of FPC
Advantages of FPC:
Simple to construct and install.
Almost no maintenance and no running cost.
Save time and energy.
competitive with electric water heater.
Used for bathing, washing clothes and kitchen utensils.
Very short pay back period.
Used for commercial purpose in hotels, hostels,
guest house, hospitals, industries, etc.
Monthly Saving on Electricity Bills
Monthly Saving on Electricity Bills :
Rating of the Electric
Daily Usage
  5-Person 10-Person 15-Person
  Monthly Electricity Bills (Rs.)*
2 KW 324.00 628.00 972.00
3 KW 486.00 972.00 1458.00
*Assuming Rs. 4.00 per KWH + Service tax and 30 days per month.