[bldg-sim] equest recovery

Brian Thornton thorntonenergy at comcast.net
Thu Feb 2 08:23:10 PST 2006



One thing I wondered about this was the amount of cooling increase showing
with eQuest modeling of an ERV.  I have not done a real study, but tried
modeling one case without any added fan energy, and running it with the
economizer active with the ERV run control set to WHEN-MIN-OA, which turns
off the heat recovery when the economizer is active (stops the wheel for a
wheel type).  Even with these two strategies, which should eliminate the
bulk of increased cooling, there is still significant increased cooling.  

Have others tried this, and are there other explanations for the cooling
results?

Brian 

Thornton Energy Consulting
p. 503-231-6600 f. 503-231-3555
thorntonenergy at comcast.net


-----Original Message-----
From: bldg-sim at gard.com [mailto:bldg-sim at gard.com] On Behalf Of Andy Lau
Sent: Wednesday, February 01, 2006 12:17 PM
To: bldg-sim at gard.com
Cc: bldg-sim at gard.com
Subject: [bldg-sim] equest recovery

Of course one cannot say conclusively what is happening here, but my
work with heat recovery systems has shown that they often increase
cooling energy for two reasons:

1.  They can eliminate the possibility of operating an air-side
economizer and getting "free-cooling."
2.  The fan power associated with heat recovery can be significant,
which will also increase cooling load.

I attach a paper that was presented at Simbuild 2004 on this subject 
(not attached to bldg-sim because it exceeds allowable size)

Andy Lau, P.E.
7group, www.sevengroup.com

fernando varela wrote:
> Hello:
>
> I'm trying a Packaged VAV system with exhaust recovery, and 
> surprisingly, when I add a recuperator, cooling consumption increases, 
> instead of reducing!! Can anybody explain this to me?????
>
> Thank you.
>
> ======================================================
> 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



More information about the Bldg-sim mailing list