[EnergyPlus_Support] Simulation Parameters, Convergence tolerances

[Linda Lawrie <linda@xxxxxxxxxx>]

What is the load convergence tolerance? Is it a relative value or
absolute value? What unit? In Watt or %

What is the temperature convergence tolerance? Is it a relative value or
absolute value? What unit? In deg.C or %?

All tolerances have units so the temperature tolerance is in degrees
C (or degrees K) and the loads tolerance is in Watts.  Both
tolerances work the same way, just one looks at temperatures and one
looks at heating and cooling loads.

After the second warmup day, the program compares the maximum temperature
experienced in a space with the maximum temperature from the previous
day.  If those two temperatures are within the tolerance, then it
has passed the first warmup check.

It does a similar comparison with lowest temperatures experience within
all the zones.  If the current simulation day and the previous day
values are within the tolerance, then it has passed the second warmup
check.

Similar things are done with the loads tolerance and the maximum heating
and cooling loads that are experienced within the spaces.  Those are
compared individually to the values for the previous day.  If they
are both in tolerance, then the simulation has passed the third and
fourth warmup check.

The simulation stays in the warmup period until ALL FOUR checks have been
passed.



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