NARVA Vacuum Tubes are produced with exceptional production standards at the NARVA plant in Brand-Erbisdorf, Germany. The specially formulated glass is manufactured using high quality raw materials: sand, feldspar, soda, dolomite and recycled glass.
This glass has a lower permeability for hydrogen and helium as compared to the more generally used borosilicate glasses. This special glass ensures the integrity of the vacuum.
The low-iron, highly transparent glass can transmit the solar spectrum from Infra-Red through UVB (280nm). The glass has an anti-reflective coating that increases the solar-energy absorption up to an average of 96%, prevents weathering and further stabilizes the glass by closing micro cracks.
The special glass properties and thickness make the NARVA Vacuum Tubes highly resistant to hail.
A solar-thermal collection unit using the innovative NARVA Vacuum Tube technology is capable of heating water to 150º Celsius. This capacity will lead to increased use of solar-thermal energy for commercial and industrial applications. More significantly, this highly efficient technology has the potential to boost the production of thermal-powered (adsorption and absorption) air conditioning.
NARVA Vacuum Tubes are fabricated by NARVA Lichtquellen GmbH+ Co.KG, an experienced glass manufacturer, and use an innovative, patented glass-to-metal connection not previously available. This glass-to-metal connection creates a permanent seal that maintains the integrity of the vacuum.
Additionally, NARVA also manufactures the copper absorbers and heat-carrier tubes central to the efficient solar-thermal collection. Thus, the long-term quality of the final product can be guaranteed.
NARVA Vacuum Tubes are available in three standard lengths: 2000mm, 1500mm and 800mm. Special size orders (between 800mm and 2000mm) require minimum quantity purchase.