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

Glenn Haynes glenn.haynes at rlw.com
Fri Dec 19 09:44:54 PST 2008



If your building is in Columbus, you will have relatively mild cooling
seasons.  If you request hourly output for your baseline and retrofit
runs and subtract to obtain hourly "savings", you will find that when
the outside temperature is well below the indoor temperature, you will
see negative "savings" due to the reduction in "free cooling" through
the roof system.  If these negative "savings" more than offset the
positive savings, you will obtain a net negative "savings" overall.





From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Cyrus
Sent: Friday, December 19, 2008 10:34 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Increase in roof insulation increases cooling


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?




                  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



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