Sunday, January 13, 2013

ETFE Condensation

13 Jan '13: The Sunbox is doing really well with the midday solar angle being almost straight on, and the double-skin ETFE having far better transmittance than the old triple-skin polycarbonate.
   One thing I have to live with is that the sealed units have a permanent H2O population that takes different forms depending on temperature - today there is a haze, other times, they are clear with discrete droplets. Never mind, the greater solar visibility of the black collectors has improved performance. Solar thermal collection since 1st December to 13 Jan was 131kWh in 2010-2011, was 171kWh in 2011-2012, and this winter was 205kWh (including a small contribution of 20 from the new Sunbox)

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