Inner Focusing Film Tube

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The absorption layer of inner tube outer surface will absorb solar energy and transfer it into heat. The heat will be transferred to the medium inside the tube. The medium then transfers the heat outside the tube to meet the water heating requirements. The reflecting arc of the inner wall of outside tube will reflect the light into inner tube and improve the heat collecting of the tube. 

Heat collecting of inner focusing vacuum tube  

1. Inner focusing film technology
High heat collecting efficiency, super low emission, reliable and long life span
2. Heat pipe technology
No water flow, no explosion risk, anti-scale accumulation, anti-over heat, fast start
3. Inner reflecting mirror
High reflecting efficiency, long life span 
Length(mm) 1900 2000 2100
Outer tube diameter(mm) 84 84 84
Inner tube diameter (mm) 37 37 37
Average heat loss (W/(m2 . ℃ ) ) ≤0.48
Stagnation parameter ( m2· ℃ /kW ) 328 336 345
Solar radiance exposure (MJ/m2) ≤2.09

QA & Test Center
1. Himin solar testing center was established in 1997, including 24 testing laboratories, with more than 1000 testing items.
2. Himin solar testing center has passed the CNAS certificate, whose testing report has same effect with China National testing report, also is the first ISO9459 international standard testing center in China.
3. The testing domain covers solar water heater, fittings (vacuum tube, water tank, bracket, etc.), solar PV module, energy-saving materials, and so on. 

Inquiry Form

Company: Himin Solar Co., Ltd.

Add.: Sun-Moon Mansion, Solar Valley Road, Economic Development Zone, Dezhou City, Shandong, China.


  • For business:
    Dezhou Office:

    Add: Sun-Moon Mansion, Economic-Development Zone, Dezhou City, Shandong, China.
    Post code: 253000
    Tel: +86-534-5089114
    Fax: +86-534-2312962
  • Qingdao Office:
    Add: #1117-1119 Room, Business Building-B, Wanda Plaza, Yanji Road, Qingdao, China
    Post code: 266034
    Tel: +86-532-55685939
    Fax: +86-532-55662319