U-pipe Solar Collector

Description of U-pipe Solar Collector:
Solar collector plays an important role in solar heating system. U pipe evacuated tube collector performs better for its low heat loss, high adaptability and aging-resistant property than the flat panel collectors.

Working principle of U-pipe Solar Collector:
The heat energy, transferred from sunlight by evacuated tubes, will be delivered by fins and the U pipes made of copper, into the heat transferring fluid to heat the water inside the tank via pump.

Features of U-pipe Solar Collector:
1. No water flows in the evacuated tube, so water scale and tube exposition are avoided. Single broken tube will not affect the working of the system.
2. It can be integrated with the architecture perfectly and be connected with the existing pipes.
3. Patented interferential film coated evacuated tube with absorptance among 94% to 96% and vacuum degree of 5×10^-4 Pa; its service life will be not less than 15 years.
4. U pipe collectors have passed the Solar Keymark certificate and CE certificate, met EN12975 standard.

Applications of U-pipe Solar Collector:
The solar collector can be installed in solar heating systems to heat water for a wide variety of uses, including home, hotel, school, business projects and industrial uses.
When in series or parallel connection, it also can be used to heat swimming pools, and supply heat for underfloor heating or air conditioning.

Technical parameters of U-pipe Solar Collector:
1. Vacuum tube:

Length	1600MM/1800MM/2100MM
Structure	Glass-glass
Diameter of outer tube	58±0.7MM
Thickness of outer glass tube	1.8±0.15MM
Diameter of inner tune	47±0.7MM
Thickness of Inner glass tube	1.6±0.15MM
Material	Borosilicate glass 3.3
Film layer	AIN/SS-AIN/CU
Vacuum degree	P≤5.0X10-4
Max. temperature	270℃～300℃
Heat loss	≤0.6W/(㎡℃)
Rated pressure	0.6Pa

2. Solar collector
Material of pressure bearing part: copper
Material of heat preservation layer: polyurethane
Frame material: 6063T5
Collector joint: ￠15 copper tube
Rated working pressure: 0.6Pa
Max. working temperature: 120℃

Model	HUJ12/16	HUJ12/18	HUJ12/21	HUJ16/16	HUJ16/18	HUJ16/21
Dimension(MM)	1778X1284X134	1978X1284X134	2278 X1284X134	1778X1636X134	1978X1636X134	2278X1636X134
Weight(KG)	42.13	47.08	53.01	55.51	61.65	69.70
Vacuum tube model (MM)	￠58X1600	￠58X1800	￠58X2100	￠58X1600	￠58X1800	￠58X2100
Vacuum tube quantity (pcs)	12	12	12	16	16	16
Liquid volume (L)	1.73	1.90	2.16	2.29	2.53	2.87
Aperture area (㎡)	1.003	1.131	1.328	1.336	1.510	1.764
Total area(㎡)	2.283	2.540	2.925	2.909	3.236	3.727
Collector area (㎡)	1.567	1.777	2.080	2.117	2.387	2.793
Absorber area (㎡)	0.860	0.972	1.142	1.146	1.296	1.522
Pieces in series	5	5	4	4	4	4

3. Efficiency
The parameters are tested by German Fraunhofer research institute.
Max. transient efficiency: η0a=0.779
Heat loss coefficient: α1a=2.103W/㎡K
Α2a=0.0107W/㎡K²
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