Solar Thermal Collector Tube Manufacturing – How They are Made

Evacuated solar thermal collector tubes circulate a working fluid, often water and are responsible for collecting the suns energy as heat and transferring it to the fluid. The design of the tubes dictates how efficiently heat is transferred and ultimately how well the whole system maintains the required temperature. So how does a company like SunMaxx manufacturer their tubes? 

According to the experts at SunMaxx, there are two different solar manufacturing procedures that take place during the evacuated tube solar collector manufacturing process.

1- the manufacturing of the actual glass evacuated tubes

2- the manufacturing of the copper heat pipes, the manifolds, mounting frames and other balance of system components. This makes the solar manufacturing simple, but extensive.

The incredibly high performance and low cost of SunMaxx Evacuated Tube Solar Collectors is made possible by our commitment to R&D as well as our innovative developments in the manufacturing process.

The Evacuated Tube Solar Collector Manufacturing Process from SunMaxx

There are two tubes used in the production of a evacuated tube. An inner and outer tube. The inner tube is 47mm in diameter and the outer tube is 58mm in diameter, allowing the inner tube to easily fit within it.

Both tubes are made of Borosilicate Glass, which is extremely strong and durable. Borosilicate Glass is one of the strongest, most durable types of glass on the market ensuring that the finished tubes are strong and durable enough to handle nearly every climate.

Using a special deposition process, the optical coatings are applied to the inner tube. The optical coating used by SunMaxx is a blend of aluminum, copper, steel and other materials.

SunMaxx has a highly proprietary and secret selective absorber coating that has dramatically increased the efficiency, performance and cost of SunMaxx Evacuated Tube Solar Collectors over these first generation collectors.

First, the inner and outer tubes are sealed together at the top, creating a single tube with an inner and out wall. At this point, there is a small hole in the bottom of the tube, where the getter will be added, and the space between the inner and out tubes will be turned into vacuum space. A special machine is used to apply the getter, evacuated the tubes and seal the bottom end, completing the evacuated tube manufacturing process

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