[Equest-users] Air Side Economizer savings

[Amber Welsh]

Anusha,

 

Are you having this problem with the Packaged multizone or the packaged
VAV?  If you are having the problem with the packaged multi-zone that is
b/c you have a dual duct system and while you are cooling off the SAT,
you are also lowering the heating temp (which then has to be heated).
This is expected for Packaged multizone (or dual duct systems where each
zone air is mixed). 

 

In regards to economizer setting you should try and see the cooling
savings you get when the economizer is set to 70F and even up to 73F.
The air is likely not too humid when the OSA temp is this mild.  This
will reduce your cooling because it reduces the delta T seen at the
coil.  You will want the compressor to be able to run when the
economizer is on b/c you may be bringing in 70F air (which is better
than 76F return air temp) and this temp will need to be reduced to 55F
(or whatever your setpoint).

 

Make sure you have cooling deck supply reset, so you can reduce the
heating when most of your building will need heating.

 

Amber

 

 

 

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

 

 

 

 

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/> 

 

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/> 

 

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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