heat pipe

solar energy collecting tube, adding one more complete glass tube in the normal tube, raising the heating effiency.

Structure	All-glass double-tube co-axial structure
	High borosilicate 3.3 glass
External pipe diameter and thickness	Φ=47±0.7mm &=1.6mm  Φ=58±0.7mm &amp&=1.6mm>  Φ=70±0.7mm &=2.0mm
Internal pipe diameter and thickness	Φ=37±0.7mm &=1.6mm  Φ=47±0.7mm &=1.6mm  Φ=58±0.7mm &=2.0mm
Pipe length	800mm    1200mm  1500mm  1600mm  1800mm  1900mm  2000mm  2100mm
Absorbing coating property ;/tr>&/tr>&ltr>   Structure     Sediment method     Specific absorption     Emission ratio	Cu/SS-ALN(H)/SS-ALN(L)/ALN   3 target magnertron sputtering plation   as=0.93~0.96(AM1.5)   εh=0.04~0.06(80±5)
Vacuum tightness	P≤5.0X10-3Pa
Idle sunning property parameters	Y=260~300m2./KW
Solar irradiation for obtaining a preset water temperature   H≤4.7MJ/m2(Φ58)     H≤3.7MJ/m2(Φ47)	H=3.7~4.2MJ/m2   H=2.9~3.2MJ/m2
&amsp; Average heat loss coefficient	ULT=0.4~0.6W/(m2.

there is cooper coil in the vacuum tube, which can improve the high effiency

* Higher Absorbance, Lower emittance, dry ex, dry exposure up to 270 degr270 degree * Higher effiher efficie efficiency, more heating Absorbance coating layout: 1--metal reflecting layer(copper) 2--absorbance layer(SS aluminumnitride metal ceramic) 3--remittance reducer layer(aluminumnitride) Material borosillicate glass 3.3(T-0.91) Coating SS-C/CU selective compound absorb coating Absorbance 0.88-0.94 Remittance 0.08-0.04 VacuumDegree =<2x10-3Pa Max. Pressure 6Bars Hail resistance =<25mm

heat pipe