Infra-red thermometer now ordered, hopefully it will arrive just in time for the coming cold spell forecast for this weekend. A few days of low temperatures outside should give time for temperature gradients to stabilise. Must pop down to Wilco and look for a couple of cheap thermometers to measure inside and outside air temperatures.
The more I think about this, the more I believe I might be on to something. Coated glass may well reflect energy back into the room, but if the internal surface of the glass is colder than the air in the room, (it is) the air in contact with the glass will be cooled by contact, and advect. (Opposite of convect - means cooling by contact with cold surface, and flowing downwards under its own weight. Cold air is heavier than warm, and sinks to the floor, leading to cold feet despite heating set high. It also might properly be described as a katabatic flow - cold air flowing from the hilltops and filling the valleys overnight). Is this loss properly accounted for in the calculation?
Coated glass undoubtedly reduces the energy loss through the glass, but I will still be surprised if more energy is lost directly through the adjacent wood frame which is warmer to touch than the glass.
Franchise enquiries still flowing in. Website analysis shows a growing number of visitors to the site.
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