[Bldg-sim] ASHRAE 90.1 fan power limitation calculation question

[Maria Karpman]

Here is an abstract from 90.1 User’s Manual that answers your question:

 

Pressure Drop Adjustment Devices

This section provides a description of the

types of devices that quality for additional

fan power. …

 

………

Return and/or exhaust airflow control devices.

Some types of spaces such as laboratories,

test rooms, or operating rooms require

that an airflow control device be provided

at both the supply air delivery point and at

the exhaust. The exhaust airflow control

device is typically modulated to maintain a

negative or positive space pressure relative

to surrounding spaces. An additional

pressure drop and associated brake

horsepower adjustment is permitted when

this type of device is installed. The credit

may be taken when some spaces served by

an air handler have exhaust airflow devices

and other spaces do not. However, the

credit is taken only for the CFM of air that

is delivered to spaces with a qualifying

exhaust air flow device.

 

-- 

Maria Karpman LEED AP, BEMP, CEM

________________

Karpman Consulting

 <http://www.karpmanconsulting.net/> www.karpmanconsulting.net 

Phone 860.430.1909 

41C New London Turnpike

Glastonbury, CT 06033

 

From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Jones, Christopher
Sent: Wednesday, July 29, 2015 6:06 PM
To: bldg-sim at onebuilding.org
Subject: [Bldg-sim] ASHRAE 90.1 fan power limitation calculation question

 

For the baseline fan power limitation, the pressure drop allowances are defined.  I am a bit fuzzy on the definition of "Return/Exhaust Control Devices".  A system with a return fan and OA economizer typically has dampers to control the flow of the OA, return/exhaust air streams.  Would these dampers qualify as a Return/Exhaust Control Device?

 

cid:image003.png at 01D09C46.E75BA0D0

Christopher Jones, P.Eng. 
Senior Engineer

 

WSP Canada Inc.

2300 Yonge Street, Suite 2300

Toronto, ON M4P 1E4
T +1 416-644-4226

F +1 416-487-9766

C +1 416-697-0065

 

www.wspgroup.com <http://www.wspgroup.com/>  

 

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