[BLDG-SIM] heat recovery in eQuest

[Renee J. Azerbegi]

Yes, this does cause condensation which shows up as a "warning" in eQuest.
Brian Fountain found the bug though. See below for those eQuest users who
think the default values should be normal design practice. Now there is a
reduction in cooling and in heating with the control by MAT which saves a
significant amount of energy, and in talking to the mechanical design
engineer for this project, this is actually how it will be controlled, and
is typical design practice.
___________________________________________________________________________

Check your heat recovery control -- I believe default is to float the
temperature which means you are recovering year round and adding to the
cooling load.  If you change this to follow mixed air temperature you should
have a better sim.

Hope this helps.

Brian Fountain
bfountain at greensim.com
 
GreenSim
(905)639-6014 - voice  |  (905)639-0443 - fax

-----Original Message-----
From: postman at gard.com [mailto:postman at gard.com] On Behalf Of JRR
Sent: Wednesday, April 13, 2005 3:59 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
>
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