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

[Haynes, Glenn]

Your cooling loads are so small, I suspect there is some kind of net
effect (sometimes smaller, sometimes greater loads) happening.  For
example, if your ERV is sensible only, perhaps the increase in latent
loads is more than offsetting your sensible savings.  Can't tell without
knowing more about your system and your weather data.  Take a look at
your hourly "savings" for clues.
 
Glenn

________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Ahmed
Azhari
Sent: Monday, May 17, 2010 11:21 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Cooling Energy and Exhaust air heat recovery



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., LEED(r) 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: aazhari at jainconsultants.com <mailto:aazhari at jainconsultants.com> 

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

 

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