Re: [EnergyPlus_Support] Discharge Coefficient

[Ana Paula Melo <apaula_melo@xxxxxxxxx>]

Hi Lixing,
  I did not understand so much your example. I have been study the Engineering 
Reference on page 383 but it is still not so clear for me yet. My problem is when the window/door are open.
  I changed some values and I noticed that the air flow has changed. But I really want to know how to calculate it correctly.
  Can you send me an example of it???
  Thanks so much,
  Ana Paula.


Lixing Gu <gu@xxxxxxxxxxxx> wrote:          Ana:

The AIRFLOWNETWORK:MULTIZONE:COMPONENT DETAILED OPENING object has two ways 
to calculate airflow across the component: window open and close. When the 
window is close, it only uses two fields to calculate the airflow: "Air Mass 
Flow Coefficient When Opening is Closed" and "Air Mass Flow Exponent When 
Opening is Closed", regardless of other inputs, including discharge 
coefficients.

When the window is open, the discharge coefficient is used to calculate 
airflow. The discharge coefficient used in the calculation is linear 
interpolation based on the window opening factor. For example, the window 
opening factor is 0.5. The input of discharge coefficient for opening factor 
#1is 0.2 at Opening factor #1=0, and the input of discharge coefficient for 
opening factor #2 is 0.4 at Opening factor #2=1. The discharge coefficient 
is 0.3. The use of discharge coefficient is given in the Engineering 
Reference on page 383.

The window opening factor is given at the report variable: Window/Door 
Venting Opening Factor. The zero value represents window is close. The 
opening factor determination/calculation is described in detail on pages 
639-644 in Input Output Reference Please add one more report variable if the 
opening factor is not in the output list. If you still have problem, please 
upload the file.

Thanks.

Lixing Gu
----- Original Message ----- 
From: "Ana Paula Melo" <apaula_melo@xxxxxxxxx>
To: "EnergyPlus Support" <energyplus_support@xxxxxxxxxxxxxxx>
Sent: Monday, March 31, 2008 3:54 PM
Subject: [EnergyPlus_Support] Discharge Coefficient

> Hi,
>
> I would like to know more about the follow field: Discharge Coefficient 
> for Opening Factor #1, located in the follow AirflowNetwork object: 
> AirflowNetwork:Multizone:Component:Detailed Opening.
>
> As this field is related to the discharged coefficient I believed that 
> its value in the air flow calculation has a special significant during the 
> simulation. The manual indicates that I can use a value greater than 0 or 
> less than 1, and the default value being 0.001. But, during my simulation 
> I changed this value for: 0.01; 0.1; 0.6;1 and the results of the air 
> change rate have not changed.
>
> I would like to know with what parameters this field is exactly related.
>
> Thank you so much,
>
> Ana Paula.
>
>
> ---------------------------------
> Special deal for Yahoo! users & friends - No Cost. Get a month of 
> Blockbuster Total Access now
>
> [Non-text portions of this message have been removed]
>
>
> ------------------------------------
>
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
>
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
>
> Attachments are not allowed -- please post any files to the appropriate 
> folder in the Files area of the Support Web Site.
>
> EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the 
> Documentation link and press the "search" button.
> Yahoo! Groups Links
>
>
>
> 



                           

       
---------------------------------
Be a better friend, newshound, and know-it-all with Yahoo! Mobile.  Try it now.

[Non-text portions of this message have been removed]


------------------------------------

The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/join
    (Yahoo! ID required)

<*> To change settings via email:
    mailto:EnergyPlus_Support-digest@xxxxxxxxxxxxxxx 
    mailto:EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx

<*> To unsubscribe from this group, send an email to:
    EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/