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I think you need to provide a little more information if you want a worthwhile answer. In what way is the file not worki

I'm having difficulty simulating a naturally ventilated space using the Monodraught windcatcher components. The model will run if I don't add any heat gains to the space, however if I add any heat gains the analysis fails due to:

"Instability in room. Possible remedies: reduce time step; set radiant fraction to 0; check gain and ventilation levels; reduce MacroFlo opening areas."

Does anyone have any ideas?

Monodraught helped me get to the bottom of this. Should anyone have a similar problem in the future see below: The ther

Monodraught windcatcher IES I'm having difficulty simulating a naturally ventilated space using the Monodraught windcatc

Monodraft windcatchers in IES I'm trying to model a naturally ventilated space in IES which will have roof mounted turre

The term you are looking at is the room temperature (as denoted by the 'r'). The subscript 'k' is the time step. Edit:

The term you are looking at is the room temperature. The subscript 'k' is the time step.

You can change the length of simulation by editing the RunPeriod object. Pretty much the first thing you will see when y

Thanks for your response, I really need to include the surface orientation as I'm using the measure as part of an automa

Thanks David for your fast and helpful response. I will give that a try.

Add rooftop PV azimuth I'd like to adapt the add rooftop pv measure to only apply to roof surfaces which face south, or