|Top controller is for the Surya-4 metal radiators|
on the house extension. The lower controller showing 64.5º
is for the main Sunbox with the swimming pool panels
Friday 5th July 2013: Warmest day of the year so far, and Saturday is likely to be hotter, and Sunday likely to be hotter still! This photo shows temperatures at about 3pm, and demonstrates perhaps how effective the ETFE is.
The vertical panels of the Surya-3 Sunbox have a steep angle to the Sun, so I would expect the metal radiators of Surya-4 to be doing better - at 15º pitch.
- On the S-4, the Sun has to fight through 6mm of solid Polycarbonate to get to the radiators.
- In the case of 2 ultra thin skins of ETFE on the S-3, most of the solar heat is arriving on the panels, and this photo shows a liquid temperature 34.4 degs C higher than the radiators, and about 40 degs hotter than the ambient air temperature.