Openstudio/Energyplus is not very accurate
Just for fun I have build a digital model in Openstudio with FloorspaceJS of my house. After several simulations and tinkering with it a bit I have come to the realization that the simulation isn't very comparable to the effects I have noticed in the real world in my house.
For example: my living room is 485 ft2 (45m2). The floor, walls and ceiling are all about 8 inches (20cm) thick made of reinforced concrete (minus the windows of course) and yes I am aware that I live in a bunker. Now the results of several Openstudio/Energyplus simulations say that my living room can be heated up (air temperature) from 61 fahrenheit (16 celsius) to 68 (20 celsius) with a 2000w electric furnace in just 10 minutes (!) when the thermal mass of all that concrete is at 61 degrees.
Now I have just tried this in my living room with a electric 2000w heater and the model is no way near accurate. The model also suggests that when the room has been at 68 degrees for 8 hours and then the heating is turned off that the air temperature is back at 61 degrees in one hour. Which also is completely unrealistic.
Somehow it seems that the interaction with the concrete thermal mass is all wrong.
To be safe I made a new fresh and simple model. Just a square concrete box/room with an 2000w electric furnace. Same result. I don't understand. It seems very strange.
Does anyone have any idea about this or has had any experience with such a model?
Thank you.
If you post a link to your model it might be easier to diagnose the inaccuracies. Some items that come to mind based on your description:
living room; are you accounting for
air exchange and/or conduction
between the living room and other
spaces in your home?
walls/ceiling/floor including windows and doors? What about other mass in
the zone (e.g. furniture)