[Equest-users] User Expression for Infiltration Neutral Zone Height

[Bishop, Bill]

Hi Melissa,
Try this expression for NEUTRAL-ZONE-HT:

switch (#SV(#L("INF-METHOD")))
   case 0 :   unused
   case 1 :   unused
   case 2 :   NPL-(#P("Z")+#P("FLOOR-HEIGHT")/2)
   case 3 :   unused
   case 4 :   unused
  default :   unused
endswitch

Calculate the neutral pressure level for your building and replace "NPL" in the expression with the calculated value.

Regards,
~Bill

William Bishop, PE, BEMP, BEAP, CEM, LEED AP
Senior Energy Engineer

[Pathfinder-EA-logo-2]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/>
134 South Fitzhugh Street
Rochester, NY 14608               [cid:image008.png at 01D5FC51.3BD960B0]         Ask me why Carbon Fee & Dividend may be right for you.

From: Equest-users <equest-users-bounces at lists.onebuilding.org> On Behalf Of Melissa Crowe via Equest-users
Sent: Tuesday, March 17, 2020 10:13 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] User Expression for Infiltration Neutral Zone Height

Hi All

Help please, I am struggling with User Expression that calculates the Neutral Zone Height for high rise infiltration. It's something like:

((Parent("Z")-0)+Local("Height")/2)*-1+(BH/2 - BG)

Where:
BH = Building Height
BG = Total of Below Grade FL to FL Height

Also the default expression includes  a switch statement.  I don't thin I need a switch statement, so how is it formatted?

[cid:image009.png at 01D5FC51.3BD960B0]

Thank you

[cid:image010.png at 01D5FC51.3BD960B0]
Melissa Crowe, LEED AP, BEMP
Senior Mechanical/Energy Engineer

[cid:image011.jpg at 01D5FC51.3BD960B0]

Boston Office
161 Worcester Road
Suite 305
Framingham, MA 01701
508-647-9200 ext. 1225
www.cmta.com<http://www.cmta.com/>
Follow us on Facebook<http://www.facebook.com/home.php#!/pages/CMTA-Consulting-Engineers/173253492360>, Twitter<https://twitter.com/CMTAEngineers> and LinkedIn<https://www.linkedin.com/company/cmta-inc.?trk=biz-companies-cym>

We've moved!  Our new location is noted above - please update your records.
Look for an invitation to our Open House event to showcase the new space in the coming months.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20200317/efdfcfa1/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image004.jpg
Type: image/jpeg
Size: 9336 bytes
Desc: image004.jpg
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20200317/efdfcfa1/attachment-0006.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image008.png
Type: image/png
Size: 1554 bytes
Desc: image008.png
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20200317/efdfcfa1/attachment-0006.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image009.png
Type: image/png
Size: 10024 bytes
Desc: image009.png
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20200317/efdfcfa1/attachment-0007.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image010.png
Type: image/png
Size: 36344 bytes
Desc: image010.png
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20200317/efdfcfa1/attachment-0008.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image011.jpg
Type: image/jpeg
Size: 2311 bytes
Desc: image011.jpg
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20200317/efdfcfa1/attachment-0007.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image002.jpg
Type: image/jpeg
Size: 1903 bytes
Desc: image002.jpg
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20200317/efdfcfa1/attachment-0008.jpg>