[Equest-users] U-Values

Peter Hillermann e190984026 at exchange.1and1.com
Wed Jun 9 10:03:42 PDT 2010


Thank you Nick, and sometimes it pays to be the nerd. I see Bill Gates
smiling everyday.

 

From: Nick Caton [mailto:ncaton at smithboucher.com] 
Sent: Wednesday, June 09, 2010 12:58 PM
To: Peter Hillermann; Pasha Korber-Gonzalez
Cc: equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] U-Values

 

I feel like such a nerd.

 

Off the top of my head:

1.5 is the figure for interior lighting of retail, whole building method

0.5 is the figure for tradable car lot surface, exterior lighting

 

~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: Peter Hillermann [mailto:e190984026 at exchange.1and1.com] 
Sent: Wednesday, June 09, 2010 11:50 AM
To: 'Pasha Korber-Gonzalez'
Cc: Nick Caton; equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] U-Values

 

Pasha,

 

You are absolutely correct. When I started this journey I was trying to use
"common sense design," which turns out not to be as common sense as one
would think.

 

As a side note for the project I'm working on does anyone know the ASHRAE
watt/ft2 count for a car dealership? Is it the 1.5 or 0.9, I hear it all
kinds of ways and I'd like to get some other opinions.

 

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: Pasha Korber-Gonzalez [mailto:pasha.pkconsulting at gmail.com] 
Sent: Wednesday, June 09, 2010 12:38 PM
To: Peter Hillermann
Cc: Nick Caton; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] U-Values

 

Peter et al,

 

Nick said what I was going to say!  I'm guessing at this point that your
climate is fairly warm (i.e. Georgia climate) and that the increased insul
is like Nick stated (over-insulating) for the cooling aspect of your model.

 

I had a project once on a college campus in Canada where the design team did
such a good job at thier ECM design stratagies that they over-designed the
building and moved the building characteristics from being a heating
dominated cimate building to being cooing dominated.  We (as the sim team)
made the recommendations that they actually remove thier ventilation heat
recovery systems (completely) and lessen the "thightness" of the envelope
design so that the building could experience some losses through the skin
and balance out the energy use of the building operations.  This was the
first time I've had to recommend to "scale back" on the design strategies.
(FYI-the HVAC was tied to a geothermal loop that needed to have more
balanced energy use for it's proper operation.  With too much cooling to the
ground the geothermal system was becoming unbalanced.  For the real
simulation-techies, we then integrated our simulations with TRNSYS to
replicate the increasing ground temps that would be resultant if the
building energy was not better balanced in the design to work with the
geothermal system & well field.)

 

Just like for so many of us when this light bulb goes on we can really see
the value of energy simulation for aiding design choices and this is when
energy modeling is actually FUN!  :)

 

pasha

On Wed, Jun 9, 2010 at 10:19 AM, Peter Hillermann
<e190984026 at exchange.1and1.com> wrote:

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 <http://westallarchitects.com/> 

 

 

 

 

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

 

 

 

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 @  <http://www.smithboucher.com/>
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 <http://westallarchitects.com/> 

 

 


_______________________________________________
Equest-users mailing list
http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
To unsubscribe from this mailing list send  a blank message to
EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20100609/65b014ac/attachment-0002.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 1459 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20100609/65b014ac/attachment-0004.jpeg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 3222 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20100609/65b014ac/attachment-0005.jpeg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/gif
Size: 2436 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20100609/65b014ac/attachment-0002.gif>


More information about the Equest-users mailing list