[Bldg-sim] boiler curves - HIR-FPLR

[James V. Dirkes II, PE]

Dear Cramer,
 
20 - 25 years ago I was re-writing the ASEAM code, and did some digging for
DOE boiler part load curves.  More recently, I've used them in Energy Plus
and have shown below the values I use.  No original documentation here, but
this might help...
 

 
Also,  I've recently done some analysis of existing building boiler
performance and it seems that the following is true:

*	Older "high mass" / high water volume boilers (think firetube
boilers and the like) tend to have a pretty darn flat efficiency curve
*	Newer "low mass" / low water volume boilers show dramatically lower
efficiency at part loads, similar to the DOE curve above.

If I were modeling an older system or a new system with high water volume
and good turndown, I'd probably use a constant efficiency "curve".  Other
boilers would get a curve that resulted in low part load efficiencies.

The Building Performance Team
James V. Dirkes II, P.E., LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653

 

 


  _____  

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Cramer
Silkworth
Sent: Monday, August 10, 2009 5:11 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] boiler curves - HIR-FPLR


Hi All,

I'm looking for some typical/default PLR efficiency curves for a boiler for
a LEED model. I'm using trnsys for the model, but I've been digging through
the DOE-2 documentation to try to find a typical default curve to use. I've
traced it to the "HIR-FPLR" keyword, but can't figure out where this curve
is actually described. Can anyone point me to where I can find the actual
equation?

Thanks,
Cramer

-- 
J. Cramer Silkworth
Transsolar Climate Engineering
Technical consulting for energy efficiency and environmental quality in
buildings.
134 Spring Street, Suite 601
New York, NY 10012
212-219-2255
silkworth at transsolar.com 

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