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Super U pipe solar collector

Himin HUJ3 U pipe collector
--withstand any stagnation condition
 
Himin HUJ3 U pipe solar collector has resolved the big problem of dry stagnation corrosion in solar collectors. The efficiency is the top range in the industry. The collector includes a header, vacuum tubes, U pipes, mounting frames and a tube bottom rack. It is typically used to collect heat for space heating or domestic hot water. The collector can be installed solely or connected together. 

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 Features
1.        Use vacuum tube and the heat transfer way through u pipes which can reduce heat loss and ensure a higher collector temperature.
2.       There is no water in the vacuum tubes, so there is no fouling , no breaking .U pipe heating technology is adopted, the temperature rise is very fast. It is high efficiency and reliable.
3.       There is no restriction for the installation height, Pressurized operation and large flow make you enjoy a pleasant bath experience.
4.       The optimal design of the collector makes it visually less obstructive and compatible with existing architectural design perfectly.
5.       The installation can be vertical or horizontal. Change the orientation according to the local condition.
6.      The aluminum U pipe is Himin patent. It is the special one which can withstand for long dry stagnation condition.



Structure and working principle

Working principle
The sunlight shines on the outer wall of the vacuum tube. Sunlight is absorbed by all-glass vacuum tube and converted to heat energy which then is transferred to U pipe by fin, aiming to heat the heat-transmission medium that exists in the U pipe. Finally heat energy is conveyed to water in the water tank.

Technical parameter

The parameter of vacuum tube

Length(mm) 1800
Structure (mm) double glass tubes
Outer Diameter of outer tube(mm) 58
Thickness of outer tube(mm) 1.6
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·℃) ≤0.5
Rated Pressure (Mpa) 0.6
 

The parameter of solar collector
 
Specification of collector HUJ3-12/1.8 HUJ3-15/1.8 HUJ3-16/1.8 HUJ3-18/1.8 HUJ3-20/1.8
Specification of vacuum tube Φ58×1800×12 Φ58×1800×15 Φ58×1800×16 Φ58×1800×18 Φ58×1800×20
No. of vacuum tube 12 15 16 18 20
Weight empty 36.63 ㎏ 44.60㎏ 47.26 ㎏ 53.09 ㎏ 60.10 ㎏
Outline dimension(mm) 1012×1931×137.5 1228×1931×137.5 1300×1931×137.5 1344×1931×137.5 1588×1931×137.5
Capacity of collector 1.43 L 1.79 L 1.91 L 2.13 L 2.38 L
Flow L/(min·㎡) 0.6~1.2 0.6~1.2 0.6~1.2 0.6~1.2 0.6~1.2
Collector type Aluminum U pipe Aluminum U pipe Aluminum U pipe Aluminum U pipe Aluminum U pipe
Insulation material PU PU PU PU PU
Working medium Propylene glycol Propylene glycol Propylene glycol Propylene glycol Propylene glycol
Rated Pressure 0.6MPa 0.6Mpa 0.6MPa 0.6Mpa 0.6MPa
Total area including the inlet/outlet 1.95㎡ 2.37㎡ 2.51㎡ 2.60㎡ 3.07㎡
Aperture area 1.47㎡ 1.85 ㎡ 1.97 ㎡ 2.05 ㎡ 2.47 ㎡
Absorber area 1.20 ㎡ 1.50 ㎡ 1.60㎡ 1.81 ㎡ 2.01 ㎡
Shell material aluminum aluminum aluminum aluminum aluminum
Frame material galvanized steel plate galvanized steel plate galvanized steel plate galvanized steel plate galvanized steel plate
Tailstock material Nylon Nylon Nylon Nylon Nylon
Collector interface 1/2″
coupling nut
1/2″coupling nut 1/2″coupling nut 1/2″coupling nut 1/2″coupling nut
Maximum working temperature 240℃ 240℃ 240℃ 240℃ 240℃

Instantaneous efficiency curve based on aperture area Aa and inlet temperature ti( linear fit) 

The instantaneous efficiency equation of collector ηoa=0.78-2.48T*
T*=(ti-ta)/G
ti: Working fluid inlet temperature, ℃
ta: Ambient temperature, ℃
G: Gross daily irradiance on solar collector aperture area, W/m2

Pressure drop
The relation curve of pressure drop between two ends p and mass flow m