I encountered a bizarre problem in my simulation today. I went to run a simulation that I new was working yesterday, but found that the results were different. Yesterday the zone air temperature was maintained at 20C, but today the boiler providing hot water to the radiant floor seems to have a cap beyond which it cannot provide more heat, and as such the zone isn't getting enough heat.
I use both OpenStudio and EnergyPlus for my simulations. I am modelling an aquaponics facility, so I start by making a simulation in OpenStudio and then export the simulation to EnergyPlus so I can add in a swimming pool.
I am sure that I have not edited the simulation since I put it aside in a separate folder where working simulations are safe in case I make a big mistake and need to start over.
I also considered the possibility that the has somehow changed and the heat loss from the building has increased and the boilers, while sized correctly before, are now undersized. However, I have not changed the material properties or any constructions so I do not see how that could have happened.
Has anyone else encountered this problem before? I tried making a brand new simulation so that no relics of the old 'broken' simulation could affect the results, and I still end up with the same problem of the zone not receiving enough heat.
Thank you.
