[Equest-users] Switch Statement Example

[Jeremy McClanathan]

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#unread


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
[cid:image001.jpg at 01CC8A84.623E54B0]
4200 194th St SW, Ste 200, Lynnwood, WA 98036
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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<mailto: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> [mailto: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<mailto: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:
[cid:image002.png at 01CC8A84.623E54B0]

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<tel:206-788-4571> | C 206-354-2721<tel: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<mailto: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<tel:814.867.3823>

f:814.867.4823<tel:814.867.4823>



daneh at mlnai.com<mailto: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<mailto: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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