Vacuum Functions in a VM Tube

Due to atmospheric pressure and the technical problems related to the sealing of the collector casing, the construction of an evacuated flat-plate collector is extremely difficult; many internal supports for the transparent cover pane must be introduced. Therefore, the problems of an effective high vacuum system with reasonable production costs remain so far unsolved.

The vacuum in the VM glass tube, being the best possible insulation for a solar collector, suppresses heat losses and also protects the absorber plate and the "heat-pipe" from external adverse conditions. This results in exceptional performance far superior to any other type of solar collector and tube strengths due to the atmospheric pressure.

It is more feasible to apply and adapt the mature technology related to the lamp industries with proven mass production. Building a tubular evacuated solar collector and the maintenance of its high vacuum, similar to light bulbs and TV tubes, is practical. The ideal vacuum insulation of the tubular evacuated solar collector, obtained by means of a suitable exhausting process, has to be maintained during the life of the device to reduce the thermal losses through the internal gaseous atmosphere (convection losses).

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