Tuesday, December 11, 2012

Expansion tank for the roof sunbox

10 Dec '12: This 8-litre expansion vessel has now been added. It should be enough to protect this small subloop in case the subloop valves are closed.
    I've noticed that the roof sunbox is completely covered with Frost in the early mornings. It is facing up to the night sky, and there is no residual heat from anything. It was about 2 degrees colder than the wall mounted sunbox when I connected up the thermostat-controller. I guess there is a small amount of heat coming through our well insulated wall, enough to reduce frost in the wall mounted sunbox. Being an enclosed space, in effect a double skin facade over that small area of 5 sqm, it must slightly reduce our heatloss. 

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