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Evacuated-tube solar collectors
Evacuated-tube solar collectors

Evacuated-tube solar collectors 1)keymark, EN12975, SRCC 2)Competitive Price 3)High quality, High performance

Evacuated-tube solar collectors

In this type of vacuum collector, the absorber strip is located in an evacuated and pressure proof glass tube. The heat transfer fluid flows through the absorber directly in a U-tube or in counter-current in a tube-in-tube system. Several single tubes, serially interconnected, or tubes connected to each other via manifold, make up the solar collector. A heat pipe collector incorporates a special fluid which begins to vaporize even at low temperatures. The steam rises in the individual heat pipes and warms up the carrier fluid in the main pipe by means of a heat exchanger. The condensed liquid then flows back into the base of the heat pipe.The pipes must be angled at a specific degree above horizontal so that the process of vaporizing and condensing functions. There are two types of collector connection to the solar circulation system. Either the heat exchanger extends directly into the manifold ("wet connection") or it is connected to the manifold by a heat-conducting material ("dry connection"). A "dry connection" allows to exchange individual tubes without emptying the entire system of its fluid. Evacuted tubes offer the advantage that they work efficiently with high absorber temperatures and with low radiation.

Key features of the Sunwe Solar Collector

Internationally certified product (EN12975/SOLAR KEMARY/SRCC)Copper heat pipes for rapid heat transfer and freeze resistant.Reliable, efficient, tri-element evacuated vacuum tubesEasy plug-in installationMaintenance freeSuitable for mains pressure water (up to 6bars, max. 10bars)Corrosion resistant material (aluminum and copper)Aluminum frame 2.0mm thicknessBlack or Silver aluminum casing in good insulatedStable solar conversion throughout the dayThe best solar collector for domestic solar water heater systemsIdeal for commercial solar water heater applicationsComprehensive 10 years limted warranty (life time will be more than 15years)

 

The working principle of solar collector is very simple.

Solar Absorption: Solar radiation is absorbed by the evacuated vacuum tubes and converted into heat.Solar Heat Transfer: Heat pipes conduct the heat from within the solar tube up to header.Solar Energy Storage: Water or water mix is circulated through the header, via intermittent pump cycling. Each time the water circulates through the header the temperatures is raised by 5-10oC / 9-18oF. Throughout the day, the water in the storage tank is gradually heated.

Type

C01-15

C01-20

C01-25

C01-30

C01-15B

C01-30B

Number of tubes

15

20

25

30

15

30

Gross area (m²)

2.29

3.05

3.80

4.67

1.33

2.42

Aperture area (m²)

1.44

1.92

2.40

2.88

0.63

1.30

Absorber area (m²)

1.24

1.65

2.06

2.48

0.54

1.08

Peak power (W / Collector)

881

1175

1469

1763

440

880

Allowable operating pressure (bar)

6

6

6

6

6

6

Test pressure (bar)

10

10

10

10

10

10

Max. stagnation temperature

200°C

200°C

200°C

200°C

200°C

200°C

Max. operating temperature

95°C

95°C

95°C

95°C

95°C

95°C

Flow rate (l / mh)

50-150

50-150

50-150

50-150

50-150

50-150

Absorber material

CU/AI/SS/N2 Borosilicate glass

Coating

ALN/SS-ALN/CU

Absorption coefficient

≥ 94%

≥ 94%

≥ 94%

≥ 94%

≥ 94%

≥ 94%

Emission coefficient

≤ 7%

≤ 7%

≤ 7%

≤ 7%

≤ 7%

≤ 7%

Weight (kg)

55

77

96

116

32

65

Liquid content

0.9L

1.1L

1.4L

2L

1L

2L

Mounting angle

15 - 75°

15 - 75°

15 - 75°

15 - 75°

15 - 75°

15 - 75°

Frame

2mm Aluminum Alloy

Heat pipe

8mm red copper

Long-term stable vacuum (Pa)

<5*10-3

<5*10-3

<5*10-3

<5*10-3

<5*10-3

<5*10-3

Glass tube diameter

58mm

58mm

58mm

58mm

58mm

58mm

Vacuum tube wall thickness

1.6mm

1.6mm

1.6mm

1.6mm

1.6mm

1.6mm

Insulation

Compressed Rockwool

Collector width

1145mm

1520mm

1895mm

2332mm

1145

2332mm

Collector length

2004mm

2004mm

2004mm

2004mm

1041mm

1041mm

Manifold

38mm red copper

Tube length

1800mm

1800mm

1800mm

1800mm

850mm

850mm

Pressure drop

<5mbar(80L/h), 12mbar (150L/h)

Evacuated-tube solar collectors

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