[EnergyPlus_Support] Re: model cooling part of a roof top unit

["donbshireyiii" <shirey@xxxxxxxxxxxxxxxxxx>]

Look at FurnaceWithDXSystem.idf for another example of using a 
unitary system (e.g. rooftop package) to meet the cooling and 
heating loads for several zones.

In IndEvapCoolerRTUOffice.idf, the HVAC system uses indirect evap 
coolers in combination with rooftop packaged units.  This example 
file uses the object DXSystem:AirLoop to model the rooftop packaged 
units.  The packaged units are comprised of DX cooling coils and gas 
heaters (see top of the idf file for a description of the system).

As described in the documentation, 
COIL:DX:CoolingBypassFactorEmpirical models the direct expansion 
cooling coil (sensible and latent capacity delivered to the supply 
air stream), and the compressor plus condenser fan energy use (DX 
Cooling Coil Electric Consumption).  The energy use of 
COIL:DX:CoolingBypassFactorEmpirical plus the energy use for the 
supply air fan describe the total electricl energy use for the 
rooftop packaged units.


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "David Cormier" 
<dcormier81@h...> wrote:
> 
> hello,
> 
> I begin to model a roof top unit. I need precision to model de 
cooling part 
> ....
> 
> The air of the system pass through a evaporator .... but I need to 
also to 
> model the compressor and the 2 fan of the condenser .. to know the 
real 
> consumption of the system
> 
> I look at the IndEvapCoolerRTUOffice.idf ... but i don't 
understand why they 
> use COIL:DX:CoolingBypassFactorEmpirical
> 
> I need suggestion for this situation ... or a example of .idf file
> 
> thank you!
> 
> David Cormier
> 
> _________________________________________________________________
> MSN Messenger : discutez en direct avec vos amis !  
> http://messenger.fr.msn.ca/



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.




 -- please post any files to the appropriate folder in the Files are of the Support Web Site.




 
Yahoo! Groups Links

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

<*> 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/