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[EnergyPlus_Support] RE: [comis] EnergyPlus use of COMIS for Cp
More appropriate to ask the question on the EnergyPlus_Support
list (which I have copied).
"keilholz, werner"
<werner.keilholz@cs To: comis@xxxxxxxxxxxxxxx@SMTP@Exchange
tb.fr> cc: "keilholz, werner"
Sent by: <werner.keilholz@xxxxxxx>@SMTP@Exchange
comis@yahoogroups.c Subject: RE: [comis] EnergyPlus use of COMIS for Cp
om
06/16/2005 10:12 AM
Please respond to
comis
The manual of COMIS 3.0 contained several errors of this type (description
of functionalities which were actually not implemented). The update of the
manuals was an important part of the COMIS 3.1 update, where such errors
have been removed.
COMIS 3.1 does not compute Cp values either (and the manual no longer
pretends so). External programs are available to estimate them (see recent
posts on this list). You can use more than one Cp value per façade in COMIS
3.1 - the 'facade-e' component in COMIS 3.1 allows to define n cp values
for
n wind direction angles, and any façade can be defined as a set of façade
elements. (façade-e is a facade-element, not necessarily the entire
facade).
As to the EnergyPlus use of COMIS, you may want to ask this question on the
Building-Sim list (http://www.gard.com/, which is pretty much about
EnergyPlus)
Werner
-----Message d'origine-----
De : comis@xxxxxxxxxxxxxxx [mailto:comis@xxxxxxxxxxxxxxx] De la part de
ruby98103
Envoyé : mardi 14 juin 2005 02:39
À : comis@xxxxxxxxxxxxxxx
Objet : [comis] EnergyPlus use of COMIS for Cp
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 its implementation of COMIS 3.0
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.
Thank you.
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