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JSHarrisThe latter point is key, as compensation control assumes a fixed linear relationship between outside temperature and heating requirement. This may or may not be the case, depending on the installation. For example, I tried (and failed) to get such a control system to work on the system I installed in our house in Scotland. The problem was that heat loss was far more dependent on local wind speed around the house than it was on outside air temperature.
Posted By: Ed DaviesThe thermal resistance from a flat surface to the air next to it is pretty small
Posted By: Ed DaviesMy first thought is that just the effect of wind blowing over the surface of the building can't make that much difference.
Posted By: SteamyTeaShould do a Wind Heating Degree Days and see how it correlates, could also do a Direct Beam Sunlight Heating Degree Days (though not nights) too. And then there is the effect of rain. Suspect what you end up with a a climate score based on all variables.
Posted By: SteamyTeaExternal is not always flat, lot of houses down here are pebble dashed and they may have double the surface area.
If you test a house for airtightness, would it not be better to do two test, one pressurising and one depressurising ?
Posted By: JSHarrisIt was pretty well sealed externally, had a 50mm cavity between the brick/block skin and the membrane covered, ply faced, timber frame (which would itself have been fairly well sealed, I'd have thought)...
Posted By: JSHarrisGetting back to wind chill effects, the standard insulation calcs assume a fairly low air velocity across the surfaces. Increase the air velocity and rate of heat transfer increases, quite markedly if the outer skin of the building is at a significant temperature above ambient.
Posted By: skyewrightCould you expand on the concepts of WHDD & DBSHDD?
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