Adding internal partitions reduces heatflow to outside: why?
Please see:
https://github.com/DamonHD/BuildingMo...
bungalow-2-dezoned.idf is a simple bungalow with 4 equal size rooms/zones, with partitions between them.
At winter design day, flat/steady temperatures inside and outside (ie everything is nominally in equilibrium) to eliminate issues with thermal capacity/'mass', heat loss is 1777W, less than expected.
I remove the partitions and merge the zones (bungalow-2-zoned-purchasedAir.idf), heat loss is now 2025W, more or less as expected.
Why the difference in heat loss when external surfaces and temperature/conditions are unchanged?
(I tried halving the partition wall thickness in case the heat loss through the contact areas between partitions and external surfaces was different, but no change.)