I am using Energy Plus to evaluate two different houses and, going through the outputs, it came to my mind that the time constant during indoor temperature thermal decays (in the night for instance) of the house could be related directly to the energy consumption for space heating. Therefore I wrote a code in Matlab to compute the thermal time constant from the 3 minutes data of indoor temperature provided by Energy Plus.
However, the time constant is not consistent between winter and shoulder months. I know it is very simplistic, but there should be some kind of consistency in it, right? What do you think I might be missing?
Thanks in advance for the help
