[Equest-users] Air Side Economizer savings

[Fleming, Joe]

Assuming that the comparison is being made between the "SA Temp..." run and the "Air Side..." run;

*         try setting the economizer dry bulb limit down to 55 degrees.  Probably not helping at that high entering temp.   More cooling will be required when all of that 65 degree air comes in, especially when it is humid outside.

*         Change the compressor lockout to "NO", you want to maintain a constant leaving air temperature and mix the air streams to 55.

*         Try lowering the lower limit below 45 or doing away with it altogether.  You are missing out on the free cooling you will get when the air is 30 degrees outside.  Since you are always supplying 55 degree air, 30 degree entering air will be mixed to 55 and less cooling will be needed for the interior zones.

 Let me know how it goes

Joe Fleming
E.I., LEED AP BD+C, BEMP
Mechanical Engineer I

TLC Engineering for Architecture
Your 2030 Challenge Partner

800 Fairway Drive, Suite 250
Deerfield Beach, FL 33441-1816

phone:

954-418-9096

fax:

954-418-9296

direct:

954-418-4591

website:

www.tlc-engineers.com<http://www.tlc-engineers.com>


[cid:image001.gif at 01CB397E.BBEAF070]<http://www.tlc-engineers.com/>

From: Sabesan, Anusha [mailto:asabesan at noresco.com]
Sent: Wednesday, August 11, 2010 4:58 PM
To: Fleming, Joe; equest-users at lists.onebuilding.org
Cc: Amber Welsh
Subject: RE: Air Side Economizer savings

Joe,
So this worked for a multi zone building that I had. Thanks
I tried the same one for another building which has packaged Multizone, Packaged VAV systems.
In addition to AIR Side economizer savings I am also going Night setback, Fixing VAV's ,SA temp reset and finally the air side economizer savings.
This is my Grid view. I really appreciate your help.
Amber,
I am getting negative heat savings. I am looking for a very conservative number and that is why I chose 65 and 45. Thanks

[cid:image002.jpg at 01CB397E.BBEAF070]


Anusha Sabesan
NORESCO
(m) (781)534-8296
(o)  (508)614-1078
From: Fleming, Joe [mailto:joe.fleming at tlc-eng.com]
Sent: Wednesday, August 11, 2010 4:19 PM
To: Sabesan, Anusha; equest-users at lists.onebuilding.org
Subject: RE: Air Side Economizer savings

Ok.  Add Econo-Lockout and set it to yes.  Then, when you are in the Parametric Run Definitions dialogue box, click on grid view and compare to the Baseline items.
For an accurate savings comparison, check to make sure Baseline has "NO" compressor lockout and your run says "YES".  Also check to make sure the baseline OA control is set to "FIXED".  (And you can compare other inputs to make sure you are comparing the two systems the way you want).
Can you email the grid view?

Joe Fleming
E.I., LEED AP BD+C, BEMP
Mechanical Engineer I

TLC Engineering for Architecture
Your 2030 Challenge Partner

800 Fairway Drive, Suite 250
Deerfield Beach, FL 33441-1816

phone:

954-418-9096

fax:

954-418-9296

direct:

954-418-4591

website:

www.tlc-engineers.com<http://www.tlc-engineers.com>


[cid:image001.gif at 01CB397E.BBEAF070]<http://www.tlc-engineers.com/>

From: Sabesan, Anusha [mailto:asabesan at noresco.com]
Sent: Wednesday, August 11, 2010 3:56 PM
To: Fleming, Joe; equest-users at lists.onebuilding.org
Subject: RE: Air Side Economizer savings

Outdoor Air Vent &Economizer       -      OA Control  -        OA temperature
This is the parameter I changed. And then I also inputted DBT High Limit (65F) and DBT low limit (45F).

Thanks
Anusha


Anusha Sabesan
NORESCO
(m) (781)534-8296
(o)  (508)614-1078
From: Fleming, Joe [mailto:joe.fleming at tlc-eng.com]
Sent: Wednesday, August 11, 2010 3:48 PM
To: Sabesan, Anusha; equest-users at lists.onebuilding.org
Subject: RE: Air Side Economizer savings

Which keywords did you adjust in your parametric component?

Joe Fleming
E.I., LEED AP BD+C, BEMP
Mechanical Engineer I

TLC Engineering for Architecture
Your 2030 Challenge Partner

800 Fairway Drive, Suite 250
Deerfield Beach, FL 33441-1816

phone:

954-418-9096

fax:

954-418-9296

direct:

954-418-4591

website:

www.tlc-engineers.com<http://www.tlc-engineers.com>


[cid:image001.gif at 01CB397E.BBEAF070]<http://www.tlc-engineers.com/>

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Sabesan, Anusha
Sent: Wednesday, August 11, 2010 3:36 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Air Side Economizer savings

I have been trying to model an existing building for which one of the parametric run being Air Side economizer savings. Every time (for different buildings)  I do this run I come across negative savings. The building is located in New York. The system is a multi zone system. I hear that many people have across this situation. My cooling savings is also minimal. Am I doing something wrong?
Please advice.
Thanks
Anusha

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