Re: [EnergyPlus_Support] Winter design day and heat recovery, how to?

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

If you are just doing a winter design day, using Purchased Air, you could model 
heat recovery by reducing the outside air flow rate to be 1 minus the heat 
recovery effectiveness.  For example, if the heat recovery were 100% effective, 
then the heating load would be the same as if there was no outside air.  If it 
is 70% effective, then it is the same as if you had 30% of the total outside 
air flow rate with no heat recovery.  

Note that purchased air with outside air is only useful if the total flow rate 
of purchased air to the zone exceeds the outside air flow rate.  If you get 
outside air flow warnings from purchased air, then you should use a constant-
flow INFILTRATION object to model the outside air flow and set the PURCHASED 
AIR outside air flow rate to zero.

Mike


On 30 Jan 2008 at 9:11, laurentvidal50 wrote:

> Hello,
> 
> In winter design calculation with Purchased Air,I wonder if there is a
> way to take into account a heat recovery system on fresh air.
> 
> Or may be is there another way than Purchased Air?
> 
> Note: I'm not interested in system sizing, only building losses.
> 
> Thank you,
> Laurent
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
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> 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





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