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[EnergyPlus_Support] COMIS Cp Calculations
The COMIS 3.0 manual gives you the distict impression that it
calculates a Cp value specific to a location (x,y,z) on a face (pg.
101 "These routines calculate Cp at any position of a surface element
on the envelope of a block shaped building").
But the EnergyPlus manual gives the distinct impression (pg. 323 -
"will automatically calculate surface-averaged Cp values for the walls
and roof of the building") that it calculates only a single Cp value
averaged over the entire building. You can also put in a schedule of Cp
values for each facade, but there only one value is allowed for each
facade-wind direction pair, not one for each "Associated EnergyPlus
Surface" object-wind direction pair.
Since most natural ventilation depends on there being a significant
difference between the Cp value of the windward windows and the leeward
windows, often enhanced by a difference in elevation, a value averaged
over the entire building seems usless to calculate natural ventilation
flows. Could someone please clarify this.
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