Inner Light-focusing U Pipe Solar Collector

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Product Introduction
The Himin inner light focusing U pipe collector includes a header, vacuum tubes, U pipes, mounting frames and a tube bottom rack. It is most often used to collect heat for space heating for domestic hot water. The collector can be installed individually or connected to a piping system.

1.Header  2.Inner light-focusing vacuum tube  3.Frame

1. The inner light focusing U pipe solar collector uses a vacuum tube with a built-in reflector technology and heat transfer method through the U pipes to reduce heat loss and ensure a higher collecting temperature.
2. There is no water in the vacuum tubes, therefore there is no contamination of the pipes and the pipes will not break. U pipe heating technology is used, ensuring the temperature rises quickly. This system is reliable and efficient.
3. There are no restrictions on the installation height. Operation is pressurized, and a large flow make your bathing experience pleasant and comfortable.
4. The optimal design of the collector makes it less visually obvious, and makes it more compatible with existing architectural designs.

Structure and working principle
Product Structure

1.Coated reflector  2.φ84 outer tube  3.φ47 inner tube  4.Fastener
1.Collector  2.Hot water  3.Cold water  4.Water Tank
1.Sunlight  2.Vacuum tube  3.U pipe

Working Principle
The sunlight shines on the outer wall of the vacuum tube as well as the built in mirror to reflect back onto the outer wall of the vacuum tube. Sunlight is then absorbed by the all glass vacuum tube and converted into heat energy which is then transferred to the U pipe via fan in order to heat the heat transmission medium inside the U pipe. The heat energy is then conveyed to the water in the water tank.

Technical parameter
The parameter of vacuum tube
Length(mm) 2100
Structure (mm) double side glass
Outer Diameter of outer tube(mm) 84
Thickness of outer tube(mm) 2.0
Inner Diameter of inner tube(mm) 47
Thickness of inner tube(mm) 1.6
Material high borosilicate glass 3.3
Solar transmission rate ≥0.92
Selective coating type AIN/AIN-SS/Cu
Absorptance ratio ≥0.94
Vacuum degree(Pa) <5.0×10-4
Maximum temperature(℃) 250~320
Heat Loss (W/m2·℃) ≤0.65
Rated Pressure (Mpa) 0.6
Technical Parameters
Specification of collector JUS 14-84/47 JUS 16-84/47 JUS 20-84/47
Specification of vacuum tube φ84/47×2100 φ84/47×2100 φ84/47×2100
No. of vacuum tube 14 16 20
Weight 50kg 59kg 76kg
Outline dimension(mm) 1554×2200×158 1754×2200×158 2154×2200×158
Capacity of collector 2.59L 2.95L 3.69L
Flow L/(min·㎡) 0.6~1.2 0.6~1.2 0.6~1.2
Collector type aluminum U pipe aluminum U pipe aluminum U pipe
Insulation material fiber glass fiber glass fiber glass
Working medium Propylene glycol Propylene glycol Propylene glycol
Rated Pressure 0.6MPa 0.6Mpa 0.6Mpa
Total area 3.42㎡ 3.86㎡ 4.74㎡
Aperture area 2.27㎡ 2.60㎡ 3.25㎡
Absorber area 1.336㎡ 1.526㎡ 1.908㎡
Shell material aluminum profile aluminum profile aluminum profile
Frame material galvanized steel plate galvanized steel plate galvanized steel plate
Tailstock material Nylon Nylon Nylon
Collector interface 3/4″coupling nut 3/4″coupling nut 3/4″coupling nut
Maximum working temperature 240℃ 240℃ 240℃
Instantaneous efficiency curve based on aperture area Aa and inlet temperature ti( linear fit)
1.Instantaneous Efficiency

The instantaneous efficiency equation of collector ηa=0.736-1.659Ti*
ti: Working fluid inlet temperature, ℃
ta: Ambient temperature, ℃
G: Gross daily irradiance on solar collector aperture area, W/m2

The relation curve of pressure drop between two ends p and mass flow m
1.Pressure Drop between Two Ends  2.Media Flow
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