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

[Melissa Crowe]

Bless you ~Bill!

Melissa Crowe, LEED AP, BEMP
508-647-9200 ext. 1225



From: Bishop, Bill <bbishop at pathfinder-ea.com>
Sent: Tuesday, March 17, 2020 11:50 AM
To: Melissa Crowe <MCrowe at cmta.com>
Cc: equest-users at lists.onebuilding.org
Subject: RE: User Expression for Infiltration Neutral Zone Height


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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

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From: Equest-users <equest-users-bounces at lists.onebuilding.org<mailto: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<mailto: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:image005.png at 01D5FC55.36631320]

Thank you

[cid:image006.png at 01D5FC55.36631320]
Melissa Crowe, LEED AP, BEMP
Senior Mechanical/Energy Engineer

[cid:image007.jpg at 01D5FC55.36631320]

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Suite 305
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