[Equest-users] Cooling Energy and Exhaust air heat recovery

Ahmed Azhari aazhari at jainconsultants.com
Mon May 17 08:21:17 PDT 2010


Hello Users, 

 

I have a packaged (Heating: Gas-Fired, Cooling: DX) air handling unit with
VAV boxes in the zones. The cooling coil control for the AHU is Zone reset.
I have noticed an odd behavior in the cooling side when I model an exhaust
air heat recovery as follow:

 

   

The cooling energy increase from 67.7MBTU to 132MBTU when I include 70%
exhaust air heat recovery which doesn't physically make sense to me.

 

When I change the cooling coil control to Outdoor air reset the results
change as follow:

 



 

The above scenario makes sense in a way that both the heating and cooling
energy decreased by incorporating exhaust air heat recovery.  

 

I appreciate any explanation on the strange behavior of scenario I

 

Best Regards, 

__________________________________________________________________________

Ahmed Azhari, B.Eng., LEEDR AP

Energy Analyst

 

Jain Sustainability Consultants Inc.

 

2260 Argentia Road, 2nd Floor

Mississauga, Ontario L5N 6H7, CANADA

Tel:  (905) 542 7211 Ext 234

Fax: (905) 542 7622

Email:  <mailto:aazhari at jainconsultants.com> aazhari at jainconsultants.com

Web:  <http://www.jainassoc.com/> www.jainassoc.com

 

NOTICE OF CONFIDENTIALITY
This communication, including any attachments, is intended only for the use
of the addressees and is confidential. 

If you received this communication in error, please permanently delete the
entire communication from any computer or other storage medium.

 

cid:image002.gif at 01C92EB4.ADAA2610Please consider your environmental
responsibility before printing this e-mail & any documents

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20100517/c5623dcb/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/gif
Size: 1257 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20100517/c5623dcb/attachment.gif>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/png
Size: 15254 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20100517/c5623dcb/attachment.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/png
Size: 14224 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20100517/c5623dcb/attachment-0001.png>


More information about the Equest-users mailing list