[Equest-users] U-Values

[Peter Hillermann]

To my friends on the list,

 

Those explanations have made perfect sense. Nick this too is the reason I am
absolutely enjoying it. I was just telling my boss how your perception of
design changes when you introduce what could actually be going on. I love
the analogy Nick posted about trapping heat in the summer. It makes perfect
sense because the more you insulate a building the better it is at NOT
transmitting heat energy. So you put 1 piece of storefront on your building
that introduces radiant heat to your floor and you're cooking the inside or
like you said one piece of equipment generating enough heat and it won't let
it escape.

 

Thanks Nick light bulb just went off.

 

Thanks,

 

PETER HILLERMANN

 

peterh at westallarchitects.com

 

westall

architects

3404 pierce drive

chamblee, georgia 30341

 

o 770.458.4113

f  770.458.5352

c 678.898.2936

 

westallarchitects.com

e-signatureUSGBC-Logo

 

 

 

From: Nick Caton [mailto:ncaton at smithboucher.com] 
Sent: Wednesday, June 09, 2010 12:03 PM
To: Peter Hillermann; equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] U-Values

 

Peter,

 

This is the exact reason I've come to really enjoy energy modeling.  Anytime
you get results that you don't expect, whether your preconceptions are right
or wrong, you're bound to learn something - sometime profound!

 

You must make the call on whether this makes sense ultimately, but there are
probably reasonable explanations for what you're seeing.  It would help us
help you if you shared more, like what climate the building is in, what
systems you're using. etc.  You will want to come up with explanations, then
investigate the model results to see if that syncs with the behavior
modeled.

 

As a start: R-27 is a high wall value - Note that walls/roofs can be both
over- and under-insulated.  Likely, you're seeing gas savings from losing
less heat in the winter and thus having less heating load, while
simultaneously trapping heat inside your building during the cooling months,
increasing your cooling equipment loads.  Hard to make more specific guesses
without more information.

 

Sidenote - take care that you're not skewing results by wiping out the
effects of wall studs when comparing a new baseline insulation value (Re:
Table A9.2.B, 90.1-2004/2007).

 

~Nick

 

cid:489575314 at 22072009-0ABB

 

NICK CATON, E.I.T.

PROJECT ENGINEER

25501 west valley parkway

olathe ks 66061

direct 913 344.0036

fax 913 345.0617

Check out our new web-site @ www.smithboucher.com 

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Peter
Hillermann
Sent: Wednesday, June 09, 2010 10:48 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] U-Values

 

To All,

 

I seem to be having some issues with my baseline design and my first
parametric run. (I am working in detail mode with INP file) When I make my
baseline wall value R-13 and change it in my run to R-27 my heating (MBTU)
load goes down by 4% however my electric rate (kWh) goes up 1%. I don't
really understand because I thought both would have gone down. Am I doing
something wrong?

 

Thanks,

 

PETER HILLERMANN

 

peterh at westallarchitects.com

 

westall

architects

3404 pierce drive

chamblee, georgia 30341

 

o 770.458.4113

f  770.458.5352

c 678.898.2936

 

westallarchitects.com

e-signatureUSGBC-Logo

 

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