[Equest-users] I missed you guys and I feel like sharing
Bishop, Bill via Equest-users
equest-users at lists.onebuilding.org
Wed Aug 16 13:17:40 PDT 2017
Christopher,
I don't believe it is possible to reference U-NAMEs with a BDL function. Hopefully I said that right.
However, you can use the same method I described below with spaces and floors.
Here is a modification of the DOE-2 default expression for infiltration AIR-CHANGES/HR that sets ACH values based on the floor the space is assigned to:
switch (#SV(#L("INF-METHOD")))
case 0 : unused
case 1 : switch #SV(#PS())
case 1 : 1.0
case 2 : 1.5
case 3 : 2.0
case 4 : 3.0
default : 0.00 endswitch
case 2 : unused
case 3 : unused
case 4 : unused
default : unused
endswitch
~Bill
From: Jones, Christopher [mailto:Christopher.r.Jones at wsp.com]
Sent: Wednesday, August 16, 2017 3:47 PM
To: Bishop, Bill <bbishop at pathfinder-ea.com>
Cc: equest-users at lists.onebuilding.org
Subject: RE: I missed you guys and I feel like sharing
Thank you Bill,
I am wondering if there is a UDF means to determine the parent floor name of the spaces in the model?
Christopher R. Jones, P.Eng.
Technical Specialist
Sustainability & Energy
[cid:image011.png at 01D316AA.8A8D8C20]
T +1 416-644-0252
2300 Yonge Street, Suite 2300
Toronto, ON M4P 1E4 Canada
wsp.com
Please consider the environment before printing...
From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Bishop, Bill via Equest-users
Sent: Wednesday, August 16, 2017 3:35 PM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] I missed you guys and I feel like sharing
I've been too clueless to notice that I haven't gotten eQUEST-users messages since May. I blocked Rodrigo's vacation messages which we all got 500 of and everything else was blocked too...
So here's a random Tip-of-the-Day!
Create custom User-Defined Default Expressions that set system and/or zone defaults based on the occurrence number of the system.
Example:
Your project uses 12 systems - five PVAV systems, five PSZ systems, one HVSYS and one UVT, and the order you created them is PVAV-1, PVAV-2,...,PVAV-5, PSZ-1,...,PSZ-5, HVSYS, UVT
The corresponding occurrence numbers for these systems is 1,2,3,4,5,6,7,8,9,10,11,12.
Using the BDL function SymValue combined with LocalSym or ParentSym, you can create expressions such as this one, which assigns different zone cooling thermostat schedules based on the system the zone is assigned to:
COOL-TEMP-SCH =
{if (#SV(#PS())==1 .OR. #SV(#PS())==7) then
#SI("72F Cool Sch", "ZONE", "COOL-TEMP-SCH")
else if (#SV(#PS())>10) then unused
else #SI("74F Cool Sch", "ZONE", "COOL-TEMP-SCH")
endif
endif}
You could make the same assignments with a SWITCH statement:
COOL-TEMP-SCH =
{switch #SV(#PS())
case 1 : #SI("72F Cool Sch", "ZONE", "COOL-TEMP-SCH")
case 7 : #SI("72F Cool Sch", "ZONE", "COOL-TEMP-SCH")
case 11 : unused
case 12 : unused
default : #SI("74F Cool Sch", "ZONE", "COOL-TEMP-SCH")
endswitch}
You would use the BDL function LocalSym to assign SYSTEM keywords by system occurrence number. Since each system TYPE has its own keyword defaults, you would need to customize the expression for each system type, or copy the same expression into each of the system types you want to apply it to.
COOLING-EIR =
{switch #SV(#LS())
case 1 : 0.2945 $ PVAV-1
case 2 : 0.3051 $ PVAV-2
case 3 : 0.2945 $ PVAV-3
case 4 : 0.2945 $ PVAV-4
case 5 : 0.3051 $ PVAV-5
case 7 : 0.3283 $ PSZ-2
default : 0.2267 $ All other systems for which this expression is used
endswitch}
Regards,
~Bill
William Bishop, PE, BEMP, BEAP, CEM, LEED AP | Pathfinder Engineers & Architects LLP
Senior Energy Engineer
[cid:image012.jpg at 01D316AA.8A8D8C20] [cid:image013.jpg at 01D316AA.8A8D8C20]
134 South Fitzhugh Street Rochester, NY 14608
T: (585) 698-1956 F: (585) 325-6005
bbishop at pathfinder-ea.com<mailto:wbishop at pathfinder-ea.com> www.pathfinder-ea.com<http://www.pathfinder-ea.com/>
[http://png-5.findicons.com/files/icons/977/rrze/720/globe.png]Carbon Fee and Dividend - simple, effective, and market-based.
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