[Bldg-sim] FW: Approach to Modeling a Central Energy Plant

[Keith Swartz]

Seth,

 

Keep in mind that the model for the baseline building requires heating
and cooling for conditioned spaces. The boiler room itself may qualify
as a semi-heated space, which will change the cooling requirement. Take
a look at Appendix G of ASHRAE 90.1-2004 for details.

 

The huge process load will definitely make it hard to reduce the overall
energy consumption. You may be able to limit the process load in the
model to 25% of the overall load. Take a close look at the LEED-NC
Reference Guide. Good luck!

 

Sincerely,

Keith Swartz, PE, LEED(r) AP

Energy Center of Wisconsin

455 Science Drive

Suite 200

Madison, WI 53711

 

Phone: 608-238-8276 ext. 123

Fax:     608-238-0523

www.ecw.org <http://www.ecw.org/> 

The Energy Center of Wisconsin is an independent, nonprofit organization
that seeks solutions to energy challenges.

________________________________

From: Seth P. Spangler [mailto:sspangle at rmf.com] 
Sent: Tuesday, May 06, 2008 2:39 PM
To: BLDG-SIM at ONEBUILDING.ORG
Subject: [Bldg-sim] Approach to Modeling a Central Energy Plant

 

Hello All,

 

I recently received a request to model a large boiler plant. The plant
is actually a major renovation, so major the project is going for
LEED-NC. Before I start gathering materials for the model I want to make
sure I have the correct approach in place.

 

The overwhelming majority of the plant is mechanical space that is not
conditioned - just mechanically ventilated.

 

Approximately 200 SF (auxiliary office space) of the building is heated
and cooled.

 

My understanding is that I will need to model the whole building with
the mechanical portion being served by ventilation fans and the
auxiliary spaces served by heating/cooling systems. The boilers will be
metered as process loads and all other mechanical equipment will act the
same as in a "standard" energy model. I am concerned about meeting and
exceeding the two point requirement for EA credit 1.

 

Is this the correct approach? If you have any tips or tricks from
previously modeled CEPs please share.

 

Thanks in advance.

 

Seth Spangler, LEED(r) AP 

Design Engineer

 

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