How to Properly Setup Night Cycling in OpenStudio
Hi Everyone,
I'd like to model a single zone with an air loop that will cycle on when heating is required at night. To do this, I set an HVAC operation schedule for operation during the day, and tried to use a Night Cycle setting with an availability manager for the setpoint to be met at night.
For whatever reason, my model does not seem to be meeting the setpoint for the control zone during unoccupied hours (18 Celsius in the zone thermostat).
Could someone perhaps direct me to a working model that has a night cycle - cycleonany availability manager (without baseboard heating), or link a tutorial on how to set one up in OpenStudio? I've tried following the "Building Energy Modelling for OpenStudio" book without success and also tried troubleshooting with this post.
Any guidance on this would be greatly appreciated.
Edit: update - I added the charts below. Bottom is zone air temp, top is mass air flow for the system. It seems the fans are not ramping up to supply enough air for heating some days - during both operating times and night cycle times. This only occurs when I select a night cycle for this air loop.
I'm not at my computer but I think it's your control type should be zone instead of cycle any.
Thanks for the comment. I tried "cycleonanyzoneheating" and it had similar results. I've updated my question for a bit more info - it seems the fans are not ramping up to supply enough air for heating some days - during both operating times and night cycle times. This only occurs when I select night cycle for this air loop. Perhaps some other setting in the model is influencing the results?
no, you are making the same mistake. It needs to be "Cycle On Control Zone" From what i understand if you have the word "ANY" it refers to lists of zones and OSApp doesn't support lists... See my post about this issue here: LINK. My single zone night manager works fine, but when i tried to do it with my 11 VAVs it simply does not function and there were some comments about unsupported lists. Nobody was able to solve my issue with the multi-zone.
Documentation here BigLadderLink
That's a useful tip for multiple zones. I've changed the setting to "cycle on control zone" and am still experiencing this issue. My air loop only has one zone. By your comments it seems I have everything setup correctly, which is reassuring. I'm thinking there may be some setting in the outdoor air terminal or air loop that I've unknowingly selected that may be causing this issue to occur only when night cycling is selected. Could you perhaps refer me to a working model with night cycling that I can reference?