Unmet Load Hours (aka “The Bane of the Completed Simulation”)
What is an unmet load hour?
Oddly, the definition of an unmet load hour is partially dependent on the software you are using, which may or may not allow you to define the throttling range (the acceptable +/- degrees where a space is deemed to be within its target setpoint).
An unmet load hour occurs when the HVAC system lacks the capacity to keep the design setpoint within the throttling range for the duration of an hour. The other caveats are that the space must be conditioned, and in operating mode (occupied).
Why do unmet load hours affect you?
Unmet hours will...