[Equest-users] Reset Based on Return Air- Equest

Amol Mehta amol.mehta at p2seng.com
Thu Nov 20 19:36:23 PST 2008
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Hi 

I am trying to model existing building with Constant Volume Dual Duct (CVDD)
with ECONOMIZER. Currently building uses Siemens controller. Controller
resets mixed air, hot deck and cold deck supply air temperature based on
return air. I was wondering if it is possible to reset in E-quest based on
return air temperature instead of outside air temperature. E-quest allows me
to do the reset based on outside air.  Has anyone modeled reset based on
return air temperature. If yes, can you please help me or give me
suggestions. Is it possible to have some kind of source code and then import
into E-quest? Thank you for your time and help. 

Regards,

Amol Mehta | Mechanical Engineer | P2S Engineering, Inc.
T 562 497 2999 | F 562 497 2990 | M 858 354 6250
5000 East Spring Street, 8th Floor, Long Beach, CA  90815
-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of
equest-users-request at lists.onebuilding.org
Sent: Wednesday, November 19, 2008 12:04 PM
To: equest-users at lists.onebuilding.org
Subject: Equest-users Digest, Vol 8, Issue 21

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Today's Topics:

   1. Fancoils and Erv (Joe Chan)
   2. Defining window properties using if-then statements
      (Matutinovic, Luka)
   3. Re: Defining window properties using if-then	statements
      (Matutinovic, Luka)
   4. Re: Defining window properties using if-then	statements
      (Matutinovic, Luka)


----------------------------------------------------------------------

Message: 1
Date: Wed, 19 Nov 2008 08:14:36 -0500
From: "Joe Chan" <joe at fieldcrafteng.com>
Subject: [Equest-users] Fancoils and Erv
To: <equest-users at lists.onebuilding.org>
Message-ID: <000001c94a48$c9587c90$5c0975b0$@com>
Content-Type: text/plain; charset="us-ascii"

I am Modeling the retirement center.

 

 

 

1.       The main floor common areas are served by 41 @  2 pipe fan-coil
units spread throughout. The outdoor air requirement for each zone being
served by the fan-coil units is fed from a roof mounted ERV unit with
built-in gas fired heating and DX cooling.  Further, the outdoor air is
pre-conditioned by the ERV unit and fed directly into the return ducts of
the individual fan-coil units.

 

Question 1.                         We would prefer to individually zone the
main floor based on the 'space use'. What is the proper way to set-up the
outdoor air portion of the program to allow for preconditioned Outdoor air
and take advantage  of the energy savings we will get from the ERV?

 

Question 2.                         If the zones throughout the main floor
are not separated by solid walls, How will we create the partitions between
zones?

 

 

Is there a way to do it?

 

 

Joe Chan, B.A.Sc.

 

  cid:image001.jpg at 01C8584D.C2C20380

 6041 6th Conc. N.

Amherstburg, On, N9V 2Y9

Tel:  (519) 726-6400

Fax: (519) 726-5028

 

This email and any files transmitted with it are confidential and intended
solely for the use of the individual or entity to whom they are addressed.
If you have received this email in error, please notify:
joe at fieldcrafteng.com

 

 

 

 

 

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Message: 2
Date: Wed, 19 Nov 2008 13:46:56 -0500
From: "Matutinovic, Luka" <LMatutinovic at halsall.com>
Subject: [Equest-users] Defining window properties using if-then
	statements
To: <equest-users at lists.onebuilding.org>
Message-ID:
	<3EC944427F87D84793DBBC4137A2B5AD5EDA92 at to1exc02wp.halsall.com>
Content-Type: text/plain; charset="us-ascii"

I'm trying to automatically adjust my window size based on a global
parameter called "Glazing Percentage".  The width of the window is fixed
and the height is defined by the following expression:
 
4.47*(#PA("Glazing Percentage")/0.4)
 
However, a large glazing percentage leads to problems since the larger
window takes up space in the plenum.  So I want to fix this by adjusting
the Y coordinate of the window.  To do this, I tried creating the
following expression:
 
if (#PA("Glazing Percentage") == 0.4)
then #L("Y") = 4.37
else #L("Y") = 4.37 - (1.12*("#PA("Glazing Percentage) - 0.4))
endif
 
When glazing percentage is set to 0.4, the above expression sets Y to
0.00.  As soon as I change it to says 0.5, eQuest crashes. 
The math is correct, but there's something wrong with my syntax.  Can
anyone please help?
 
I've attached the pd2 and inp files for reference.
 
Thanks,
Luka
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Message: 3
Date: Wed, 19 Nov 2008 14:15:47 -0500
From: "Matutinovic, Luka" <LMatutinovic at halsall.com>
Subject: Re: [Equest-users] Defining window properties using if-then
	statements
To: "Matutinovic, Luka" <LMatutinovic at halsall.com>,
	<equest-users at lists.onebuilding.org>
Message-ID:
	<3EC944427F87D84793DBBC4137A2B5AD5EDAA7 at to1exc02wp.halsall.com>
Content-Type: text/plain; charset="us-ascii"

Sorry, I fixed the typo in the expression. It should say:
if (#PA("Glazing Percentage") == 0.4)
then #L("Y") = 4.37
else #L("Y") = 4.37 - 1.12*(#PA("Glazing Percentage") - 0.4)
endif
 
And no, that didn't fix it.

________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of
Matutinovic, Luka
Sent: Wednesday, November 19, 2008 1:47 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Defining window properties using if-then
statements


I'm trying to automatically adjust my window size based on a global
parameter called "Glazing Percentage".  The width of the window is fixed
and the height is defined by the following expression:
 
4.47*(#PA("Glazing Percentage")/0.4)
 
However, a large glazing percentage leads to problems since the larger
window takes up space in the plenum.  So I want to fix this by adjusting
the Y coordinate of the window.  To do this, I tried creating the
following expression:
 
if (#PA("Glazing Percentage") == 0.4)
then #L("Y") = 4.37
else #L("Y") = 4.37 - (1.12*("#PA("Glazing Percentage) - 0.4))
endif
 
When glazing percentage is set to 0.4, the above expression sets Y to
0.00.  As soon as I change it to says 0.5, eQuest crashes. 
The math is correct, but there's something wrong with my syntax.  Can
anyone please help?
 
I've attached the pd2 and inp files for reference.
 
Thanks,
Luka
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Message: 4
Date: Wed, 19 Nov 2008 14:22:50 -0500
From: "Matutinovic, Luka" <LMatutinovic at halsall.com>
Subject: Re: [Equest-users] Defining window properties using if-then
	statements
To: "Matutinovic, Luka" <LMatutinovic at halsall.com>,
	<equest-users at lists.onebuilding.org>
Message-ID:
	<3EC944427F87D84793DBBC4137A2B5AD5EDAAE at to1exc02wp.halsall.com>
Content-Type: text/plain; charset="us-ascii"

Ok I found my mistake.
 
It's unnecessary to use "#L("Y") " to define the value of Y.  I think I
ended up getting into a circular reference problem. 
 
The correct expressions is:
if (#PA("Glazing Percentage") == 0.4)
then 4.37
else 4.37 - 1.12*(#PA("Glazing Percentage") - 0.4)
endif

________________________________

From: Matutinovic, Luka 
Sent: Wednesday, November 19, 2008 2:16 PM
To: Matutinovic, Luka; equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] Defining window properties using if-then
statements


Sorry, I fixed the typo in the expression. It should say:
if (#PA("Glazing Percentage") == 0.4)
then #L("Y") = 4.37
else #L("Y") = 4.37 - 1.12*(#PA("Glazing Percentage") - 0.4)
endif
 
And no, that didn't fix it.

________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of
Matutinovic, Luka
Sent: Wednesday, November 19, 2008 1:47 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Defining window properties using if-then
statements


I'm trying to automatically adjust my window size based on a global
parameter called "Glazing Percentage".  The width of the window is fixed
and the height is defined by the following expression:
 
4.47*(#PA("Glazing Percentage")/0.4)
 
However, a large glazing percentage leads to problems since the larger
window takes up space in the plenum.  So I want to fix this by adjusting
the Y coordinate of the window.  To do this, I tried creating the
following expression:
 
if (#PA("Glazing Percentage") == 0.4)
then #L("Y") = 4.37
else #L("Y") = 4.37 - (1.12*("#PA("Glazing Percentage) - 0.4))
endif
 
When glazing percentage is set to 0.4, the above expression sets Y to
0.00.  As soon as I change it to says 0.5, eQuest crashes. 
The math is correct, but there's something wrong with my syntax.  Can
anyone please help?
 
I've attached the pd2 and inp files for reference.
 
Thanks,
Luka
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