U Pipe Solar Collector

U pipe solar collector working principle:
Each vacuum tube has a direct flow U pipe that is connected to the header pipe inside manifold. Each U pipe is seamed in an aluminum heat transfer fin inside of vacuum tube that transmits the heat from the inner tube to the U pipe. The liquid (usually a glycol-water antifreeze mixture) inside of the copper U pipe is heated, then conducts the heat energy to the water inside of storage tank through plate exchanger or internal spiral coil.

U pipe solar collector characteristic:
● Solar Keymark(EN12975) certified,  click here.
● Higher efficiency η0 = 0.79 (aperture area).
● Low temperature resistance, even can be work under -50℃ ambient, so can be used all year round in cold climate area.
● Passive tracks the sun: the round absorber surface of vacuum tubes passively track the sun throughout the day.
● Available in 8,10, 12, 15, 18 and 20 tubes model, flexible combination. 
● No water inside vacuum tube, so vacuum tube will not break in the winter frozen weather. 
● In the event of a tube damaged, the whole system will still keep working, just remove and replace, low cost. 
● Combined with building perfectly, installation angle from 0° to 90°, ideal for slope roof or flat roof installation.
● It can be combined with existing water heating device easily.
● Tube can be replaced without draining solar fluid; 
● Significant advantages over flat plate.
● Low maintenance!
 
                        
U Pipe Solar Collector Key Components

U pipe solar collector specification: 
1. Vacuum tube: Borosilicate glass 3.3, ALN/AIN-SS/CU coating, Φ58×1800mm. 
2. Manifold casing: Aluminium alloy (Color: silver and black).
3. Header pipe: Red copper.
4. U pipe: Red copper.
5. Insulation layer: Compressed rock wool. 
6. Heat transfer fin: Integrated aluminium sheet.
7. Frame: Aluminium alloy.
8. Inlet/outlet: Φ22mm(3/4 and 1inch).
9. Working pressure: 0.6MPa.

 
tm - ta  [k] Global Irradiance G
G=400W/m2 G=700W/m2 G=1000W/m2
0k 600W 1050W 1478W
10k 569W 1019W 1450W
30k 495W 945W  1380W
50k 405W 855W 1290W

U pipe solar collectors application:
1) Domestic water heating, such as shower, kitchen washing.etc.
2) Room heating, such as under floor and radiator heating.
3) Old heating equipment/system retrofit.
4) Large scale commercial solar water heating system, such as hotel, apartment, school, hospital.etc.

Reference area Aperture area Gross area
η0 0.79 0.455
a1W/(m2k) 1.35 0.778
a2 W/(m2k) 0.013 0.008

Parameter table:
Model Heat pipe vacuum tube Header pipe / U pipe (mm) Power output (W) L/W/H (mm) Loading Qty. (set)
Dia. (mm) Len. (mm) Qty. (pcs)  20GP 40GP 40HQ
JUC-5818-8 58 1800 8 Φ22 / Φ8 591 1960 x775 x 138 83 179 208
JUC-5818-10 58 1800 10 Φ22 / Φ8 739 1960 x925 x 138 70 150 175
JUC-5818-12 58 1800 12 Φ22 / Φ8 887 1960 x1075 x 138 60 129 150
JUC-5818-15 58 1800 15 Φ22 / Φ8 1108 1960 x1300 x 138 50 108 125
JUC-5818-18 58 1800 18 Φ22 / Φ8 1330 1960 x1525 x 138 41 88 103
JUC-5818-20 58 1800 20 Φ22 / Φ8 1478 1960 x1675 x 138 38 81 94