[EnergyPlus_Support] Re: COMSI AIR FLOW:OPENING=>Discharge coefficient ?

["waspoorboy" <mingsbox@xxxxxxxxxxxxxx>]

Joe,

Thanks for your explanation.

For crack, Q=Cp*(delta P)^n

For opening, Q= Cd*A* f(delta P)

1.The airflow calculation for LVO is some complicated function in 
COMIS, much more complicated than crack flow. (Y/N)

2.The calculation algorithm of LVO is not explained in COMIS 3.0 user 
guide, is there any manuals or publications that talk about it ?

3.If Cd is specified by user (not zero), then COMIS will use it and 
not determine the Cd from the other input parameters. (Y/N)

4.For EnergyPlus/COMIS to determine Cd itself, the user specify all 
Cd to zero for all opening factors. (I mean does this work in 
EnergyPlus/COMIS as in COMIS 3.0) (Y/N)

5.Is it recommended to let COMIS determine Cd itself ? (Y/N)

6.E+ I/O ref manual p.245 says Cd should be 0.0 ~ 1.0,
but COMIS 3.0 manual p.62 says Cd can be up to ~ 1.5,
does it work in E+ when Cd > 1.0 ? (Y/N)

7.COMIS AIR FLOW:Opening,
W_Window, !- Name
.0001,    !- Air Mass Flow Coeff Window or Door Is Closed

some combinations of Air Mass Flow Coeff cause error message
in E+/COMIS:
**Fatal** Error in the ventilation part! MATRIX SINGULAR FOR ZONE #6
Is there any solutions ?

Thanks again,
Ming


------------------------ Yahoo! Groups Sponsor ---------------------~-->
Buy Ink Cartridges or Refill Kits for your HP, Epson, Canon or Lexmark
Printer at MyInks.com. Free s/h on orders $50 or more to the US & Canada.
http://www.c1tracking.com/l.asp?cid=5511
http://us.click.yahoo.com/mOAaAA/3exGAA/qnsNAA/dkFolB/TM
---------------------------------------------------------------------~->

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

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 are of the Support Web Site.




 

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