Hi. I am modelling a very inefficient library building in E+ which has a CAV system and very low insulation etc. Whenever I change the timestep to a different number, the results change drastically. For example: for the values of timesteps 1, 5, 20, 30; the corresponding results are 406, 322.5, 265, 249.13 kWh/m2y.
Another weird behavior with the model is that when I change the values for insulation thicknesses for the exterior walls or the U values of WindowMaterial:SimpleGlazingSystem, the results are almost not effected. (I have checked that the materials I produce are referenced in a construction object and that construction object is also referenced inside all the exterior wall surfaces of the building!). When the insulation (polyurethane) thicknesses are 0, 3 cm and 5 cm; the corresponding results are 277.02, 265.79, 263.37 kWh/m2y. When the window U-Values are 5.8, 3.0, 1.9; the corresponding results are 277.02, 268.04, 265 kWh/m2y.
I feel like the timesteps should not effect the simulation results this much and changing the window U values and insulation thicknesses should change the results much more than how much it is effected here. Could this be showing a huge problem with the way that I modeled the building or could this be a normal behavior that should be expected?
Any help is appreciated. (the sooner the better.. kinda in a hurry.)
(I have uploaded the idf file with the schedules included inside a zip file. ) (I am using Energyplus version 9.3)
