[Bldg-sim] boiler curves - HIR-FPLR

[Kingsley, Michael L.]

I have a question directly related to this, especially given James'
comment regarding high vs low mass boilers.  Has anyone changed the
START-UP-TIME or STANDBY-TIME for boilers from the DOE-2 default values?
If so can you also share the basis you used to arrive at the numbers?  I
know that these are not simple numbers to arrive at; I'm just interested
in what others might have done or related comments.  

 

Michael L Kingsley

 

________________________________

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of James V.
Dirkes II, PE
Sent: Monday, August 10, 2009 7:03 PM
To: 'Cramer Silkworth'; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] boiler curves - HIR-FPLR

 

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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