[bldg-sim] heat recovery in eQuest

[Dang, Arvinder]

A follow up on a discussion which happened a few weeks back on heat
recovery in eQUEST. I am facing a similar problem where on using an
Enthalpy wheel for heat recovery my heating energy reduces significantly
but my cooling energy also increases ( this seems incorrect). Brian you
had mentioned that the Make up Air temperature control should be set to
Mixed Air Reset instead of float to avoid recovering all year round.
However when you set this it asks for an option for capacity control.
The different options include
Trim Economizer,Bypass OA, Bypass Exhaust, Modulate HX. 
Could you or anyone else explain what these different options mean and
how would they effect the results.

Thanks

Arvinder  Dang
Sustainable Design Specialist
LEED(r) Accredited
Syska Hennessy Group, Inc.

 	11500 W. Olympic Boulevard, 
Suite 680
Los Angeles, CA 90064
Tel: 310.312.0200, x3730
Direct: 310.254.3730
Email: mailto:adang at syska.com
http://www.syska.com


-----Original Message-----
From: postman at gard.com [mailto:postman at gard.com] On Behalf Of JRR
Sent: Wednesday, April 13, 2005 2:59 PM
To: BLDG-SIM at GARD.COM
Cc: BLDG-SIM at GARD.COM
Subject: [BLDG-SIM] heat recovery in eQuest

Do the  exhaust conditions cause condensation?
john ross

Renee J. Azerbegi wrote:

>I am having trouble modeling heat recovery in eQuest. For this project,

>it is a 100% outside air constant volume system (a base case) for a 
>multi-zone laboratory air handling unit with heat recovery added to it 
>(50% effectiveness, cross-flow). My cooling load increases 
>significantly and my heating load decreases significantly for a total 
>change in energy cost of 1% INCREASE. Has anyone run into this issue 
>with eQuest? I've used heat recovery before in eQuest and it never 
>seems to change the energy results by more than 1 or 2%, however basic 
>hand calculations show much higher savings typically.
>
>Thanks much!
>
>Renee Azerbegi
>
>======================================================
>You received this e-mail because you are subscribed to the 
>BLDG-SIM at GARD.COM mailing list.  To unsubscribe from this mailing list 
>send a blank message to BLDG-SIM-UNSUBSCRIBE at GARD.COM
>
>
>  
>



======================================================
You received this e-mail because you are subscribed 
to the BLDG-SIM at GARD.COM mailing list.  To unsubscribe 
from this mailing list send a blank message to 
BLDG-SIM-UNSUBSCRIBE at GARD.COM


===========================
You received this e-mail because you are subscribed 
to the BLDG-SIM at GARD.COM mailing list.  To unsubscribe 
from this mailing list send a blank message to 
BLDG-SIM-UNSUBSCRIBE at GARD.COM