[Equest-users] Switch Statement Example

Bishop, Bill wbishop at pathfinder-ea.com
Tue Oct 18 05:29:42 PDT 2011
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Thanks Jeremy! I added an expanded version of your switch expression as
an esimforums post reply.

 

I'd like to figure out a quick way of restoring defaults by removing the
appropriate lines in the input file. If anyone knows how to do a
Find-and-Replace in NoteTab Light to remove an entire line, please
describe or give me a call. For example, I believe removing all the
lines for LIGHTING-SCHEDUL keywords under the SPACE commands would
restore the default, which would be much faster than doing a  manual
right-click-R for each space in Spreadsheet view.

 

Thanks,

Bill

 

 

 

From: Jeremy McClanathan [mailto:jmcclanathan at CDiengineers.com] 
Sent: Friday, October 14, 2011 6:23 PM
To: 'Robby Oylear'; Bishop, Bill
Cc: equest-users at lists.onebuilding.org
Subject: Switch Statement Example

 

Switch statements can be used with text.  You don't have to use
integers.  I posted a step by step example of how to assign lighting
schedules with a switch statement including screenshots and the example
model at the following link:

 

http://www.esimforums.com/equest/viewtopic.php?f=70&t=124&view=unread#un
read

 

I use similar formulas to assign loads, schedules, min flows, osa, etc.
Also, as Robby mentioned, I also get out of the wizard as soon as
possible to streamline the process.  I only create the geometry in the
wizard.  Everything thing else I can do faster in detailed edit mode.
Although it took a lot of effort to get to that point.

 

Jeremy

 

___________________________________________

Jeremy McClanathan, P.E., BEMP, HFDP, LEED(r) AP BD+C 

 

4200 194th St SW, Ste 200, Lynnwood, WA 98036

P 425-672-1071 | F 425-778-8769 

P Please consider the environment before printing this email.

 

From: Robby Oylear [mailto:robbyoylear at gmail.com] 
Sent: Friday, October 14, 2011 11:57 AM
To: Bishop, Bill
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Using global parameters to streamline
modeling

 

I've never used switch because most of the projects we work on have less
than 10 or so space types.  I have not ran into a problem where my user
expression had too many characters.  From what I understand of switch,
you have to use integers which would require you to have a corresponding
Space Type legend (i.e. 1 = Office, 2 = Corridor, etc.).  I prefer to be
able to look at a space in eQUEST and from the activity description know
exactly what it's supposed to be based on the name I've assigned it.

 

-Robby

On Fri, Oct 14, 2011 at 11:49 AM, Bishop, Bill <
wbishop at pathfinder-ea.com> wrote:

Thanks Robby, Keith, Jeremy and Brian for your feedback.

 

I like the idea of referencing C-ACTIVITY-DESC in user input
expressions. What is the size limit of nested If-Then statements if you
want to allow for many space activity types? In particular, would it be
possible to create a user expression that returned the ASHRAE 90.1
baseline lighting value (W/ft2) based on space activity type? I would
want to allow at least 20 or so space types. Could you use a Switch
statement? Is there a way to assign integer values to space activity
types, since Switch needs an integer-compatible expression?

 

Thanks,

Bill

 

From: equest-users-bounces at lists.onebuilding.org [mailto:
equest-users-bounces at lists.onebuilding.org] On Behalf Of Robby Oylear
Sent: Friday, October 14, 2011 11:13 AM
To: Dane Heimerman
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Using global parameters to streamline
modeling

 

Dane,

 

What I'm discussing is in the Detailed Edit mode.  Part of our efforts
to streamline energy modeling has been to stay out of the wizard as much
as possible.  We mainly just use the wizard to setup the building shell,
define slab penetrations, and infiltration rates (i.e. things that are
hard to do in detailed edit mode).

 

Under the Building Shell tab in, select any space within your project.
C-ACTIVITY-DESC is located here:

 

 

We use a three letter acronym to describe the space type.  In the
example above this space is a corridor.  You can then create conditional
statements for most of the Space and/or Zone parameters based on this
acronym. 

 

For example, a user default expression for equipment W/SF can be written
as such:

if(#L("C-ACTIVITY-DESC")=="COR")

then (0.25) else

no_default

endif

 

These statements can have varied levels of complexity due to the nature
of referencing the different variables in eQUEST using the #BDL
functions.  For instance, in the above example I'm referencing the local
BDL keyword "C-ACTIVITY-DESC" by using the BDL function #L which
references a local BDL keyword.  

 

Hope this helps,

 

Robby Oylear, LEED(r) AP BD+C

Mechanical Project Engineer

Energy Analyst

 

D 206-788-4571 | C 206-354-2721

www.rushingco.com <http://www.rushingco.com/> 

 

On Fri, Oct 14, 2011 at 5:58 AM, Dane Heimerman <daneh at mlnai.com> wrote:

Robby,
Could you go over the basics of this C-ACTIVITY-DESC? I stumbled upon
this thread, and it intrigued me, but I can't find what you're talking
about. Where is 'space parameters'? Is this within the schematic of DD
Wizard, or in detailed mode? If you could just get me pointed in the
right direction, I'm usually able to struggle through it and learn on my
own. 

Thanks,

Dane Heimerman, EIT
HVAC Engineer
Michael L. Norris & Associates, Inc.
270 Walker Dr, Suite 201B
State College, PA 16801
p:814.867.3823
f:814.867.4823
 
daneh at mlnai.com


On 10/13/2011 6:05 PM, Robby Oylear wrote: 

	Bill, 

	 

	When I look at most of my project files, the Global Parameters
list is pretty standard, however each parameter is usually project
specific, i.e. Number of Residences, Glazing Ht by Orientation, System
Efficiencies.

	 

	One thing that can really help speed up modeling is to get fancy
with the user-defined defaults, using basic IF/THEN statements you can
setup default schedules, lighting w/sf, equip w/sf, infiltration etc.
based on a trigger of the space.  

	 

	Using the C-ACTIVITY-DESC command under the Space Parameters you
can label a space based on use, and have your defaults do the rest of
the work for you.

	 

	-Robby

	On Thu, Oct 13, 2011 at 1:11 PM, Bishop, Bill <
wbishop at pathfinder-ea.com> wrote:

	Does anyone use pre-defined global parameters in an input file
that they import, as a way to streamline the modeling process?

	 

	I already have ASHRAE schedules and building constructions in an
input file that I import, but I never use global parameters.

	I make most of my universal changes by using User-Defined
Default Values. Am I missing a big opportunity to speed up the modeling
process?

	 

	Thanks,

	Bill

	 

	Error! Filename not specified.

	 

	
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