solar water heater heat pipe vacuum tube
USD $2 - $7 /Set
Min.Order:100 Sets
Haining Sanneng Solar Water Heater Co., Ltd.
solar water heater heat pipe vacuum tube
standard :47*1500mm ,58*1800mm,47*1800mm,70*2100mm
Solar tubes specifications
Vacuum tube size | Φ58*1800mm | |||
Vacuum tube material | High borosilicate glass 3.3 | |||
Selective coating | Cu/SS-ALN(H)/SS-ALN(L)/ALN | |||
Heat pipe diameter | Condenser Φ14/ 24mm, body Φ8mm | |||
Heat pipe material | TU1 copper | |||
Heat conductor | Aluminum wrapping | |||
Tube sealing material | Silicon plug with stainless plate | |||
Vacuum degree | ≤4*10-3Pa | |||
Absorption coefficient | ≥90% | |||
Emission coefficient | ≤7.5% | |||
Heat transfer efficiency | ≥ 95% | |||
Heat transfer coefficient | (1.6~2)*104 w/m.k | |||
Heat transfer power | 150 - 180W | |||
Heat resistance | 0.01 - 0.02°C/W | |||
Isotherm | ≤ 2 ℃ | |||
Start up temperature | ≤ 25℃ | |||
Start up rate | 30 s | |||
Heat conducting wise | from liquid to gas and corpuscles | |||
Working temperature | (-) 40 ~ 260℃ | |||
Axial thermal conductivity | 27.2 MW/M2 | |||
Radial thermal conductivity | 145 KW/M2 | |||
Equivalent heat conductivity | 6000-15000 times | |||
Working angle | 15 ~90° | |||
Hail resistance | Φ25mm | |||
Duration of element | ≥ 15 years | |||
Model Number | Size/ MM | Container Loading Qty (PCS) | ||
20GP | 40GP | 40HQ | ||
SN-HP47/1800 | Φ47*1800 | 4256 | 8511 | 10335 |
SN-HP58/1800 | Φ58*1800 | 2547 | 5094 | 6186 |
1 performance
The job of the heat pipes in the evacuated tubes is to rapidly transfer away the heat. The heat pipe capacity must therefore be greater than the evacuated tube's maximum output to avoid a bottle neck in the heat transfer chain. SANENG heat pipes have an average heat transfer capacity of >110Watts. The maximum heat output of an SANENG vacuum tube is around 65Watts.
2 Freezing Protection
Although the heat pipe inside is a vacuum and the boiling point has been reduced to 25°C, the freezing point is still the same 0°C as water at sea level. Since the heat pipe is located within the vacuum insulated glass tube, night temperatures as low as -40°C will not cause the heat pipe to freeze. The water used in heat pipes still freezes in special cold conditions, but it freezes in a controlled way that does not cause swelling of the copper pipe.
3 Advantages of heat pipe solar collector
Comparing with vacuum tube solar collector:
1. High efficient heat pipe tubes;
2. High pressure and anti-freezing collector;
3. Less heat loss for closed loop circulation;
4. No risk of tube breaking from thermal shock;
5. No risky of tube breaking from water freezing;
6. No system drainage even though one or several tubes are broken;
Comparing with flat panel solar collector:
1. Higher efficiency collector, much lower heat loss with vacuum insulation;
2. Super anti-freezing performance for heat pipes in cold weather condition;
3. No system drainage even though one or several tubes are broken;
4. More convenient in system parts carrying and installation;
5. Contact: eva he Mobile: (00)86-13511390503 Skype: eva201423