[Bldg-sim] Unusual Result

Glenn Mercurio glenmerc at sonic.net
Fri Sep 24 15:07:52 PDT 2010


Hi Jaigath,

With such high internal loads, your building may be losing more heat through
the windows with the higher U-value of 0.7 and thus cause for less cooling
as less heat is built up within the building.

Glenn Mercurio

Energy Analyst, LEED AP

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Jaigath
Chandraprakash
Sent: Friday, September 24, 2010 2:59 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Unusual Result

 

The project I am working on is an office building that operates 20 hrs per
day with most of the loads occuring at night and low occupancy on daytime.
It is a cooled by a DX roof unit and has a very high internal load. No
heating equipment is required because the building is in Climate 1. I was
surprised that when I changed my window U-value from 0.3 to 0.7 I got less
cooling consumption. I always thought that getting low u-value will give me
less coling consumption. Can somebody tell me why I am getting less cooling
when I use a higher window U-value?

 

Thanks,

 

Jaigath

 

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