IES-VE User Forum

Hi!

I am configuring a mixed mode ventilation but I am having some trouble in specifying when the windows are open and air conditioning if off/ windows are closed and air conditioning on.
I set a specific profile for the windows saying: (ta<0.31*to+21.3) and for air conditioning: (ta>0.31*to+21.3)

This means: when the room temperature is higher than 0.31 times the outside temperature plus 21.3, the windows should close and the air conditioning should turn on.
But it is not working. There are moments which the air conditioning is ON and the windows are OPEN.

I have tried all these formulas:
(ta<0.31*to+21.3)
(ta<(0.31*to)+21.3)
(ta<((0.31*to)+21.3))

But it does not seem to be the problem. Does anyone have had the same problem? Or know how to fix it?

Sabrina

Hi,

Without even looking at your specific formula my first suggestion is to have a look at your simulation timestep and reporting interval, ensure these are aligned for the simulation and you have a low enough timestep to see any subtle effects such as rapid switching on and off that could be occurring in your simulation.

Next you should test your formula logic is having the desired effect. Focus on just the AC and then just the MacroFlo operation and check that at different times under different conditions you are seeing the effects of the profile that you want, if they both switch on at the same time one (or both) are not behaving correctly and you can then focus on why not and troubleshoot to resolve, following that it should just be a case of applying the same process to the other use of it

Phil