Evacuated-tube solar collectors

Evacuated-tube solar collectors 1)keymark, EN12975, SRCC 2)Competitive Price 3)High quality, High performance

Evacuated-tube solar collectors

In this type of vacuum collector, the absorber strip is located in an evacuated and pressure proof glass tube. The heat transfer fluid flows through the absorber directly in a U-tube or in counter-current in a tube-in-tube system. Several single tubes, serially interconnected, or tubes connected to each other via manifold, make up the solar collector. A heat pipe collector incorporates a special fluid which begins to vaporize even at low temperatures. The steam rises in the individual heat pipes and warms up the carrier fluid in the main pipe by means of a heat exchanger. The condensed liquid then flows back into the base of the heat pipe.The pipes must be angled at a specific degree above horizontal so that the process of vaporizing and condensing functions. There are two types of collector connection to the solar circulation system. Either the heat exchanger extends directly into the manifold ("wet connection") or it is connected to the manifold by a heat-conducting material ("dry connection"). A "dry connection" allows to exchange individual tubes without emptying the entire system of its fluid. Evacuted tubes offer the advantage that they work efficiently with high absorber temperatures and with low radiation.

Key features of the Sunwe Solar Collector

Internationally certified product (EN12975/SOLAR KEMARY/SRCC)Copper heat pipes for rapid heat transfer and freeze resistant.Reliable, efficient, tri-element evacuated vacuum tubesEasy plug-in installationMaintenance freeSuitable for mains pressure water (up to 6bars, max. 10bars)Corrosion resistant material (aluminum and copper)Aluminum frame 2.0mm thicknessBlack or Silver aluminum casing in good insulatedStable solar conversion throughout the dayThe best solar collector for domestic solar water heater systemsIdeal for commercial solar water heater applicationsComprehensive 10 years limted warranty (life time will be more than 15years)

 

The working principle of solar collector is very simple.

Solar Absorption: Solar radiation is absorbed by the evacuated vacuum tubes and converted into heat.Solar Heat Transfer: Heat pipes conduct the heat from within the solar tube up to header.Solar Energy Storage: Water or water mix is circulated through the header, via intermittent pump cycling. Each time the water circulates through the header the temperatures is raised by 5-10oC / 9-18oF. Throughout the day, the water in the storage tank is gradually heated.

Type	C01-15	C01-20	C01-25	C01-30	C01-15B	C01-30B
Number of tubes	15	20	25	30	15	30
Gross area (m²)	2.29	3.05	3.80	4.67	1.33	2.42
Aperture area (m²)	1.44	1.92	2.40	2.88	0.63	1.30
Absorber area (m²)	1.24	1.65	2.06	2.48	0.54	1.08
Peak power (W / Collector)	881	1175	1469	1763	440	880
Allowable operating pressure (bar)	6	6	6	6	6	6
Test pressure (bar)	10	10	10	10	10	10
Max. stagnation temperature	200°C	200°C	200°C	200°C	200°C	200°C
Max. operating temperature	95°C	95°C	95°C	95°C	95°C	95°C
Flow rate (l / mh)	50-150	50-150	50-150	50-150	50-150	50-150
Absorber material	CU/AI/SS/N2 Borosilicate glass
Coating	ALN/SS-ALN/CU
Absorption coefficient	≥ 94%	≥ 94%	≥ 94%	≥ 94%	≥ 94%	≥ 94%
Emission coefficient	≤ 7%	≤ 7%	≤ 7%	≤ 7%	≤ 7%	≤ 7%
Weight (kg)	55	77	96	116	32	65
Liquid content	0.9L	1.1L	1.4L	2L	1L	2L
Mounting angle	15 - 75°	15 - 75°	15 - 75°	15 - 75°	15 - 75°	15 - 75°
Frame	2mm Aluminum Alloy
Heat pipe	8mm red copper
Long-term stable vacuum (Pa)	<5*10-3	<5*10-3	<5*10-3	<5*10-3	<5*10-3	<5*10-3
Glass tube diameter	58mm	58mm	58mm	58mm	58mm	58mm
Vacuum tube wall thickness	1.6mm	1.6mm	1.6mm	1.6mm	1.6mm	1.6mm
Insulation	Compressed Rockwool
Collector width	1145mm	1520mm	1895mm	2332mm	1145	2332mm
Collector length	2004mm	2004mm	2004mm	2004mm	1041mm	1041mm
Manifold	38mm red copper
Tube length	1800mm	1800mm	1800mm	1800mm	850mm	850mm
Pressure drop	<5mbar(80L/h), 12mbar (150L/h)

Evacuated-tube solar collectors