[Equest-users] ASHRAE 90.1-2007 G2.4

[Otto Schwieterman]

I have never modeled a building that used solar panels and I have a LEED
question regarding this topic.

 

Can you include the utility cost savings of solar panels if you are
selling the energy instead of using it?

 

Thanks,

 

Otto

 

From: Alan Crittendon [mailto:alanc at dwcei.com] 
Sent: Thursday, December 02, 2010 2:34 PM
To: 'eQuest'
Subject: [Equest-users] ASHRAE 90.1-2007 G2.4

 

I've asked a variation of this before, but I am still totally confused
by section G2.4 in 90.1-2007.  I've asked earlier about whether Solar
panels can be used to calculate the % efficiency difference between the
baseline and proposed.  I was pointed to pg 274 of green building design
where it plainly says "model systems directly in the proposed design
energy model".  OK. Understood.  But I am still bothered by G2.4.  It
SEEMS to say the exact opposite but I can't make sense of it.  I've read
the user manual explanation and it doesn't help me out at all.

 

The bldg will have solar panels generating about $20k worth of money a
year.  ALL of it sold back to the electric company at 220% more than
they are charged per kwh.  So it makes more sense to sell the energy he
makes than to use it.  I've attached the two ES-D reports. Using the
solar panel money I am at 64% more efficient.  Without them I am at 35%.


 

I know this assumes my models are accurate but can anybody help me make
sense of this?

 

Alan Crittendon, PE, LEED AP
DW Collier Engineering, Inc.

 


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