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[EnergyPlus_Support] weird zone air temperature curve

Hi,

I am using E+ with BCVTB to test heating control in domestic houses.
In order to validate the heating behaviour of a simple house with regular materials, I have built a simple 5m x 3m x 3m box house with an electric radiator (700W capacity) and no windows or doors or any kind of internal loads. The construction materials have values based on a BRE measured u-values report and more or less are average materials used in UK domestic houses.

I run the simulation in E+ for 5 days with outdoor temperature between
-4 and 9 degrees Celsius and the temperature graph was somehow weird. When the heating goes to ON the temperature initially increases rapidly (more than 1 degree per 3 minutes) and then increases with a slightly more expected way (1 degree per 20min). In a similar way when the heating gets to OFF the temperature initially decreases too quickly (1 degree in 3 minutes) and then the decrease rate gets a little bit smoother. 

Do you have any idea why the temperature curve follows this positive or negative "logarithmic" form ?

Thank you very much!





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