[Equest-users] Fan modeling as per Appendix G

[Otto Schwieterman]

Mark, 

 

In order for eQUEST to calculate the EIR, you must enter the EER in the
wizard, then eQUEST will calculate the EIR in the detailed interface.
eQUEST will not calculate the EIR if you input the efficiency in the
detailed interface. 

 

After eQUEST calculates the new EIR, you must use the formula to
calculate the fan energy and enter the information into the detailed
interface.

 

Otto

 

From: Bishop, Bill [mailto:wbishop at pathfinder-ea.com] 
Sent: Tuesday, February 09, 2010 9:03 AM
To: mabiz at cox.net; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Fan modeling as per Appendix G

 

Mark,

 

In this context, "explicitly" means entering a non-zero value for fan
SUPPLY-STATIC or SUPPLY-KW/FLOW when using eQUEST. Most likely you will
be modeling the fan as continuous anyway (per G3.1.2.4) but even if you
model it as cycling you will need a non-zero fan power if you let eQUEST
calculate the EIR. eQUEST converts SEER and EER to EIR which has no fan
power, then adds fan power in the form of SUPPLY-STATIC. (Someone please
correct me if I'm wrong.)

 

Use the G3.1.2.9 equations for your baseline fan power. See attached for
reference. There is a lot of discussion in the archives (try "SEER EER
EIR") but none that I'd call definitive. I'm still trying to figure it
out.

 

Regards,

Bill

 

William Bishop, EIT, LEED(r) AP | Pathfinder Engineers & Architects LLP

Mechanical Engineer

 

134 South Fitzhugh Street
Rochester, NY 14608
T: (585) 325-6004 Ext. 114
F: (585) 325-6005

wbishop at pathfinder-ea.com

www.pathfinder-ea.com

P Please strive to live sustainably.         

________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of
mabiz at cox.net
Sent: Monday, February 08, 2010 7:08 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Fan modeling as per Appendix G

 

I could use an explanation of what ASHRAE App. G means by the word
"explicitly" in the context below?

 

> G3.3.2.4 Fan System Operation states:  "If the supply fan is modeled
as cycling and fan

> energy is included in the energy-efficiency rating of the equipment,
fan energy shall not be

> modeled explicitly."

> 

> I have a project with PSZ-HP packaged heat pump units SEER 13.0 in the
baseline design.  Does the statement above mean that I can't use the
equations in TABLE G3.1.2.9 Baseline Fan > Brake Horsepower when setting
up > HVAC system fans in the DD wizard screen 4 of 7?

 

> Any insights on this would be greatly appreciated.

> 

> Mark Beaudry

 


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