[EnergyPlus_Support] Simulation Parameters, HVAC Time Steps

[Linda Lawrie <linda@xxxxxxxxxx>]

What is the difference between the TimeStep indicated in the TimeStep
in Hour object and the "variable" timestep indicated in the
HVAC simulation (ref. Engineering Documentation)?

The TimeStep In Hour object specifies the "basic" time step
for the simulation.  This is used in the Heat Balance calculation as
the driving time step.  When the HVAC portion of the simulation
begins it's solution for the current time step, it uses the basic time
step as its maximum but then can reduce the time step, as necessary, to
reach the solution.

The technical details of the approach are explained in the Engineering
Documentation, under "Integrated Solution Manager". 

Users can see the effect/actual HVAC time step used if they select the
"detailed" option on an HVAC report variable (e.g. Zone/Sys Air
Temp).  To contrast, the "Zone" variables will only be
reported on the Heat Balance time step (e.g. Mean Air Temperature).



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