[Bldg-sim] Baseline case pressure drop credit calculation

Duggin, Cory Cory.Duggin at tlc-eng.com
Mon Mar 9 14:21:39 PDT 2015

Yes, you only get to take the pressure drop adjustment for baseline systems serving spaces that are served by the MAU in your proposed.  I have even been asked to only apply the PD to the amount of airflow the system with the filter supplies, but this was in a situation where the amount of return air very high in comparison.

Cory Duggin, PE, LEED AP BD+C
Associate/Energy Engineer
TLC Engineering for Architecture


From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Jones, Christopher
Sent: Monday, March 09, 2015 4:14 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Baseline case pressure drop credit calculation

A question about pressure drop credit calculation:
Table lists the pressure drop adjustment values.  My example is a zonal system (fan coils, heat pumps, etc.).  Outdoor air is ducted from an ERV make-up air system to each zonal system.  The make-up air system has a heat recovery device and a MERV 13 filter.  Does one take credit for the devices on the make-up air system when calculating the baseline fan power for the respective systems?

As only a fraction of the supply flow of the zonal systems comes from the make-up air system, it seems inappropriate to take credit for devices on the make-up air system?

Christopher Jones, P.Eng.
Tel: 416.644.4226 • Toll Free: 1.888.425.7255 x 527

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