All-glass Evacuated Solar Collector Tube with Heat Pipe (SOLAR WATER HEATER,ISO9001,SOLAR KEYMARK,CE,SRCC,EN12975)

The tube structure is between all-glass evacuated tube and metal-glass evacuated tube with heat pipes.

All-glass Evacuated Solar Collector Tube with Heat Pipe

 The principle behind heat pipe's operation is actually very simple. Freeze Protection:Even though the heat pipe is a vacuum and the boiling point has been reduced to only 25-30oC (86oF), the freezing point is still the same as water at sea level, 0oC (32oF). Because the heat pipe is located within the evacuated glass tube, brief overnight temperatures as low as -20oC (14oF) will not cause the heat pipe to freeze. Plain water heat pipes will be damaged by repeated freezing. The water used in Sunflower solar heat pipes still freezes in cold conditions, but it freezes in a controlled way that does not cause swelling of the copper pipe.

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Evacuated Solar Collector Tube:

Length	1500mm	1800mm
Outer tube diameter	47mm	58mm
Inner tube diameter	37mm	47mm
Weight	1.3kg	2.2kg
Glass thickness	1.6mm	1.6mm
Material	Borosilicate Glass 3.3	Borosilicate Glass 3.3
Absorptive coating	Graded A1/N/A1	Graded A1/N/A1
Vacuum degree	P<5*10 -3 Pa	P<5*10 -3 Pa
Thermal expansion	3.3*10 -6 /°C	3.3*10 -6 /°C
Insolation Temperature	>200°C	>200°C
Absorptance	>93%	>93%
Emittance	<8%	<8%
Heat loss	<0.8W/(m2°C)	<0.8W/(m2°C)
Maximum strength	0.8Mpa	0.8Mpa
Resist cold	-35 °C	-35 °C
Resist hailstone	Ø 25mm	Ø 25mm
Resist wind	30m/s	30m/s
Start-up temperature	<=25°C	<=25°C

  Heat Pipe:

Item No.	47mm×1.5M	58mm×1.8M
Copper Material	TP2 Non-oxo Copper TP2
Medium	Inorganic Medium
Pipe diameter	8mm
Dimension of heat exchange end	14mm×64.5mm
Weight	196g	240g
Length	1370mm	1680mm
Pipe thickness	0.75mm
Start-up temperature	<25°C
Insolation Temperature	>200°C
Power	125W

  Absorber (Heat transfer) Fin: 

 

Material	Aluminum
Thickness	0.15mm
Shape (Flat or Cylindrical)	Cylindrical
Length	350mm	420mm
Quantity	6 pcs / 3 pairs	8 pcs / 4 pairs

Heat pipe Specification:

 

Item No.	Specification
	Diameter of solar tube	Length of solar tube
SFVB4715	Ø47mm	1.5M
SFVB5818	Ø58mm	1.8M

    

All-glass Evacuated Solar Collector Tube with Heat Pipe (SOLAR WATER HEATER,ISO9001,SOLAR KEYMARK,CE,SRCC,EN12975)