Re: [EnergyPlus_Support] Help!! - Estimating Extraction Zone Air Temperature

["Michael J. Witte" <mjwitte@xxxxxxxx>]

1.  I am not sure I understand completely what you are trying to model.  Are 
the bathrooms modeled as a separate zone?  If so, then you could use a MIXING 
object to model the air movement from the adjacent zones which is induced by 
the exhaust (extraction) fan.  The air extracted from the bathroom zone is 
going to be the same temperature as the bathroom zone mean air temperature, 
plus the temperature rise due ot the exhaust fan power.  It seems that a full 
airflownetwork model is more complex than required to answer your question.  

2.  <repeating my response to your earlier post which apparently was deleted 
when this message was posted> What you suggest will work, but it will add lots 
of extra clutter to your input file.  Using the unitary zone and system type 
(with no cooling coil) would be cleaner, but still a bit messy.  For either 
system type, if you set the "System Availability Schedule" to always be zero in 
the Compact HVAC:SYSTEM object, then the air handling system should never run.  
And also set the night cycle controls to "Stay Off".  

Mike


On 10 Dec 2007 at 12:39, brandao_nuno wrote:

> Dear All,
> 
> I´m currently simulating a small school, with only Ventilation and
> Heating requirements. For heating, the school as hot water radiators,
> with water supplied by a boiler. Ventilation is assured by simple
> ventilators. As usual, air is extracted by ventilators in the bathrooms.
> I have two questions:
> 
> 1: I have calculated zone loads, but i also have to estimate zone
> extraction air temperature and for that I´m studying the AIRFLOW
> NETWORK group. It seems that I have to specify a complete air network,
> is there any other simple away of doing this?
> 
> 2: I´m using the BASEBOARD HEATER:Water:Convective from the
> Radiative/Convective Units group to model the BASEBOARD equipment. I´m
> also thinking about a possibility to model the radiators with the
> CompactHVAC objects.
> Is it possible to use the COMPACT HVAC:ZONE(and SYSTEM):VAV by just
> filling the BASEBOARD fields and "turning off" the AHU suplly fan?
> EPLUS creates objects in the BASEBOARD HEATER:Water:Convective,
> however, I´m a little bit unsafe about this procedure. Can you give me
> a hand about this issue?
> 
> 
> Thank you very much
> Nuno
> 
> 
> 
> 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
> 
> 
> 
> 
> 


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





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/