[Equest-users] Increase in roof insulation increases cooling load.

[Vestal, Alan]

Improving only wall insulation I would expect only a 1-2% increase in
overall energy savings at best.  It is the other building you speak of
running equest prior getting 8-10% savings by just improving wall
insulation that I would be skeptical of.

 

 

Alan Vestal, PE, LEED(r) AP
Sr. Project Engineer, Mechanical

karpinski
ENGINEERING
8720 Orion Place, Ste 120
Columbus, OH  43240
P  614.430.9820
F  614.430.9825
E  avestal at karpinskieng.com <mailto:gavestal at karpinskieng.com> 
W www.karpinskieng.com <blocked::http://www.karpinskieng.com/> 

Celebrating 25 years!

________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Cyrus
Grimes
Sent: Friday, December 19, 2008 11:15 AM
To: Eric O'Neill
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Increase in roof insulation increases
cooling load.

 

This is a school and 70% of the rooms have about 25 kids. I was
skeptical at first I guess I will concede. I just don't have the
confidence in Equest yet. I guess I can play around with the insulation
and fin the preferred insulative value for the roof, do you suppose such
a prediction would be valid?

 

               Cyrus Grimes, LEED(r) AP               .     

                    Mechanical Engineer

Phone (614) 443-1178 ext. 274

 

From: Eric O'Neill [mailto:elo at MichaelsEngineering.com] 
Sent: Friday, December 19, 2008 11:03 AM
To: Cyrus Grimes
Cc: equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] Increase in roof insulation increases
cooling load.

 

Cyrus,

 

Depending on your internal gains, the increased levels of roofing
insulation may make it more difficult for the system to reject the heat.
I generally find this response when modeling auditoriums or rooms with
high levels of internal gains. The system ends up working overtime to
displace the heat that would normally have escaped after the internal
loads subsided and/or ambient conditions cooled off. For instance, on a
45 degree day, the building might break even with a high internal gain
and low roof insulation, but with the higher roof insulation, the
internal gains dominate and cooling is required. It really depends on
the scenario, but without more information, I can only say that it's
plausible. 

 

Eric 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Cyrus
Grimes
Sent: Friday, December 19, 2008 9:34 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Increase in roof insulation increases cooling
load.

 

In a parametric run the roofing insulation was increased from U= 0.063
to U=0.033. by increasing the thickness of the "Insul Bd 2in (HF-B3)" of
the built up roof from 0.28 to 0.64.

 

In my results the HVAC cooling load increased by 4% and my heating load
decreased by 4%. Overall the net change was -1% energy savings.

 

Is this reasonable?

 Any suggestions?

 

thanks

 

                  Cyrus Grimes, LEED(r) AP               .     

                    Mechanical Engineer

 

Corporate Office

1108 City Park Avenue, 3rd Floor

Columbus, Ohio 43206

 

Phone (614) 443-1178 ext. 274

Fax: (614) 443-1594

e-mail: cgrimes at dynamix-ltd.com

 

 www.dynamix-ltd.com

P Please consider the environment before printing this e-mail note

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20081219/4b17b847/attachment-0001.htm>