Solar FPC Scale Free

Scale free / Indirect / Secondary circulation
Basically this type of system is used for lower maintenance in hard water area or to prevent collector tubes breakage by ice freeze in tubes. Generally in cold countries at night temperature goes below 0oc and water freeze so tubes will breakdown or higher scale in water which will deposit in collector so maintenance will be higher and performance will be lower for normal systems, so from both point of view scale free or indirect or secondary systems is used.
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.