double vacuum heat pipe for solar water heater

No.

Parameter

All-glass heat pipe

1

Structure

Full-glass double-tube coaxial structure

2

Material

Borosilicate glass 3.3

3

Outer Tube Diameter

Φ47±0.7mm  &=1.6mm

Φ58±0.7mm  &=1.6mm

4

Inner Tube Diameter

Φ37±0.7mm  &=1.9mm±0.5mm

Φ47±0.7mm  &=1.9mm±0.5mm

5

Length

Φ47-1500mm  Φ58-1800mm

6

Condensing Section Length

Φ47-1500mm  &=125mm±5mm

Φ58-1800mm  &=145mm±5mm

7

Base Material

SS-AlNx/Cu

8

Deposition Method

Triple-targetDCreactive magnetic sputtering

9

Absorption Ratio

0.92-0.95(AM1.5)

10

after Coating

0.90-0.92(AM1.5)

11

Absorption Ratio after Vacuum-pumping

0.04-0.06(80°C±5°C)

12

Emission Ratio

P≤1.0×10¯³ (Pa)

13

Vacuum between Inner Tube and Outer Tube

P≤3.0×10¯³ (Pa)

14

Vacuum in Inner Tube

Y=260-300m².°C/KM

15

Average Heat Loss Coefficient

U_LT= 0.4-0.6w/( m².°C)

16

Amount of Solar Radiation under Stagnation

H=3.7-4.2 MJ/m² ( 58mm)

H=2.9-3.2MJ/ m² (47mm)