"Plant temperatures are getting far too hot"
Used DesignBuilder...
I am trying to run a full year simulation with all of the HVAC equipment turned off in order to make sure the building is responding to outdoor air temperature fluctuations properly. Around June 11, I start getting a fatal error, "Plant temperatures are getting far too hot, check controls and relative loads and capacities", and the simulation stops. In addition, when I plot the zone temperatures up until the point where the simulation stopped, they are getting to be up to 40 degC, which is much hotter than the outdoor temperature. I do not know how the zone temperatures are getting this high without any of the heating and cooling systems on. I also do not know how to resolve the Plant Temperature error I am getting.
Suggestions?
Is your pump on that plant loop set to constant or intermittent flow? If there is no load, and the pump is continuous, it can build up heat in the loop.
Changing the pumps to intermittent allowed the simulation to complete for the entire year. However, the zone temperatures are still getting up to around 40 degC throughout the summer, which is much too high. I can't figure out what equipment in the building is still on that would make the temperature that high.