Support in EnergyPlus reading output variable "Zone Mean Air Temperature"

[mwetter]

Support reading output variable "Zone Mean Air Temperature". This need to be supported on the EnergyPlus side. Modelica currently issues an assertion to guard against reading this output. This was added in commit d6669ad

[kbenne]

I made a correction to address this here: NREL/Spawn@1c30973

There appears to be a lag of two timesteps though, so I am not ready to close this issue. It is probably the same root issue as this #1679

[kbenne]

I made a second correction to addressing lagging here NREL/Spawn@a61f2b3

As the commit message describes, the "zone mean air temperature" output variable will still only be updated when time crosses a zone timestep. @mwetter I'm guessing that what you want is for the output variables to be update immediately given the current inputs, is that correct? I can make another commit to definitively make that happen for "zone mean air temperature" but there might be a whack a mole situation as I go down this road as there is not one centralized function or method call to update all report variables.

[mwetter]

@kbenne : Yes, the output should be updated for the current input variables.

[kbenne]

Addressed here: NREL/Spawn@e443d63

Please read the commit log for details. We might need to open new issues to address lag in other output variables, but I have addressed many of them.