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Re: [EnergyPlus_Support] COMIS + nodes
The Air Mass Flow FromZone to ToZone report variable describes the air
flow across a surface (from an external node to a zone node).
The external node you describe is required (or not) based on the input
for the COMIS Simulation object.
From the IO Reference manual:
COMIS Simulation object
Field: Wind Pressure Coefficients
Determines whether the wind pressure coefficients are input or
calculated. The choices are INPUT or SURFACE-AVERAGE CALCULATION.
If INPUT, you must enter a COMIS CP Array object, one or more COMIS
External Node objects and one or more COMIS CP Values objects.
The second choice, SURFACE-AVERAGE CALCULATION, should only be used for
rectangular buildings. In this case surface-average wind pressure
coefficients vs. wind direction are calculated by the program for the
four vertical facades and the roof based on your entries for "Building
Type," "Azimuth Angle of Long Axis of Building," and "Ratio of Building
Width Along Short Axis to Width Along Long Axis" (see description of the
following three fields). With this choice you do not have to enter any
of the following objects: COMIS CP Array, COMIS External Node and COMIS
CP Values. The calculated wind pressure coefficients are shown in the
eplusout.cif file (see "The COMIS Input File," below).
Use this method when the wind pressure coefficients field is set to INPUT:
COMIS EXTERNAL NODE,
SFacade, !- Name
1.0; !- Outside Pollutant Concentration Factor {dimensionless}
COMIS SURFACE DATA,
Surface_1, !- Name of Associated EnergyPlus Surface
CR-1, !- Name of Air Flow Crack or Opening Type
SFacade, !- External Node Name
1; !- Crack Actual Value or Window Open Factor for
Ventilation {dimensionless}
Use this method when the wind pressure coefficients field is set to
SURFACE-AVERAGE CALCULATION:
COMIS SURFACE DATA,
Surface_1, !- Name of Associated EnergyPlus Surface
CR-1, !- Name of Air Flow Crack or Opening Type
, !- External Node Name
1; !- Crack Actual Value or Window Open Factor for
Ventilation {dimensionless}
For COMIS inputs you do not specify an internal node in a zone, use the
zone name in the COMIS Zone Data objects and a surface name in the COMIS
Surface Data object.
So try outputting the Air Mass Flow FromZone to ToZone and Air Mass Flow
ToZone to FromZone report variables and see what happens.
sebastian.coene wrote:
> hi,
>
> My question:
>
> I have a 1 zone model and use comis for natural ventilation. Now, i
> want to know mass flow through two openings on oppostite sides of the
> zone.
> I must define 2 external nodes at each of the two windows through wich
> the air flows.
>
> BUT can i define a node in the middle of the zone for use only in
> COMIS? I can't find it in the manual? Only thing i can find is the
> defining of nodes for all types of mechanical ventilation.
> Or do i use 'Air mass flow from fromzone to tozone' for this?
>
> Any one knows the answer? Or how to define internal nodes for use in
> COMIS?
>
> Thanks in advance,
> Sebastian
>
>
>
>
>
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