Hi all,
I am doing some researches about the R-C representation of the building thermal system and I would like to create a model using Energy Plus to check if my model can be used every day. I decided to start in the easiest way: I created a building (idf file: https://pastebin.com/YMnYajix) with four walls, a roof and a floor. To simplify the calculations, I decided to use very low conductivity values for the roof and the floor and no internal loads. Furthermore, I decided to carry on simulations by means of a custom .epw file where all the values are fixed (e.g., a row of .epw: “2019,1,1,1,0, ,23,5,0,101000,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 “) and the ground temperature is always equal to 23 °C like the external air temperature. No Sun is present as well as wind.
The problem arises when I perform simulation: at the end of it, the internal temperature is equal to 19.24 °C even if I expect to have 23 °C. What am I missing?
Using my RC model, this means that there is a heat flux of 15 W even if no internal loads are present. What could the cause be? Is there any variable that I should monitor?
Thanks!
