Solvis’ flat-plate collectors are made from durable aluminium with a highly selective coating – evenly vaporised and good for the environment. Copper piping that conducts heat is welded below the absorber plate. The laser-welded connection ensures the optimum heat transfer and provides ten percent more power.
Highly transparent hardened solar glass with an anti-reflective coating increases the energy output capabilities even more. It lets extra sunlight through and is extremely durable. This special surface treatment increases light transmission. These features ensure that the solar collector preforms optimally, looks great and last practically forever.
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Collector Improvements 2015
The Solvis Fera I AR models, existing large area collectors in the sizes 5.6m2, 7.0m2 and 8.4m2 were improved in several ways in 2015. The same glass plate with anti-reflective coating remains but the hydraulics of the collector are new. Solvis improved upon their previous design of harp-shaped or double harp-shaped pipe registers with the new double meander design.
The new design reduces pressure losses by approximately 50% and enables the series-connected collector strings to be longer, simplifying hydraulics for larger systems and reducing pipework.
Solvis’ new double meander also increased the conversion factor from 0.83 to 0.84, allowing more heat transfer to take place. It might not seem like a vast improvement but together with the improved heat loss coefficient it makes a notable difference.
The yield of the 8.4 m2 collector is stated at 4422 kWh/year in the Solar Keymark data sheet (location Würzburg, Tm = 50 °C). The previous version only achieved 4174 kWh/yr. A gain of 248 kWh/year or approximately 5% increase in performance.
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