RE: [EnergyPlus_Support] COMIS

["Edward G. Lyon" <eglyon@xxxxxxx>]

The network nature of COMIS should need at least 2 openings.  I would expect less flow than the equation may suggest.  If you have 2 openings with the same coefficients, the flow would need to be split between the two openings.
 
It is far simpler to control a minimum ventilation with zone infiltration instead of COMIS.  Infiltration uses the same type of wind pressure flow equation, but it does work to enter coefficients that cancel the wind pressure component and establish a constant ventilation flow by infiltration.  It also requires only one object per zone and not a network description like COMIS needs.

________________________________

From: EnergyPlus_Support@xxxxxxxxxxxxxxx on behalf of Michael J. Witte
Sent: Thu 6/9/2005 1:14 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] COMIS


I am not an expert on COMIS, but I would guess that this flow is being reduced 
due to the restrictions of other flow openings?  Perhaps you need an equal and 
opposite crack to maintain the minimum flow at all times?

Mike


On 7 Jun 2005, at 8:30, alexandrevarela2000 wrote:

> Dear all,
> 
> While using COMIS I wanted to define a minimum flow rate for the 
> building. In order to achieve this I created a COMIS AIR FLOW:Crack 
> object like this:
> 
> Name: Vent
> Air mass flow coefficient: 0.025
> Air mass flow exponent: 0.0
> Crack length: 1
> 
> When looking at Infiltration-Air Change Rate report I was hoping to get 
> a minimum ach related to 0.025. As I'm getting ach values below what I 
> was expecting I don´t know what to make of it.
> 
> Thank you for help,
> Alexandre
> 
> PS - Everybody thinking abou taking a vacation in Portugal, the weather 
> is great!
> 
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
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> 
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> in the Files area of the Support Web Site.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
> 
> 
> 



========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx




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