[Equest-users] Interior Blind Savings

[Dana Troy]

Josh,

 

There is a previous discussion on interior blinds in the archives: 
http://lists.onebuilding.org/htdig.cgi/bldg-sim-onebuilding.org/2007-Jun
e/005640.html

 

As for the savings, $25 per year seems about right. Interior blinds do
not stop the solar radiation from entering the space even though the
occupants might feel cooler with the blinds drawn.

 

When the blinds are down, the occupant does not have the sun shining
directly on them, which makes them feel cooler than if the blinds were
up with the sun shining on them. However, when the blinds are down, the
sun is still heating up the air space between the blinds and the glass.
That air then eventually mixes with the air in the space, which still
needs to be cooled. eQUEST does not take into consideration that the hot
air near the windows might take a while to get to a thermostat across
the room.

 

We had a family residence that had tinted plastic blinds on the inside
of their floor to ceiling south facing windows. In the summers, the room
would get to 90+ even with the blinds drawn. We installed exterior
blinds about 2 to 3 feet from the windows and the temperature never got
above 80.

 

Hope this helps.


Dana Troy

Energy Analyst 

LEED(r) Accredited Professional

  <http://www.glumac.com/> 

________________________________

320 SW Washington, Suite 200
Portland, OR 97204-2640
T.  503.227.5280  F. 503.274.7674

D. 503.345.6286

dtroy at glumac.com

Thinking. Inside the building.
www.glumac.com 

  

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Josh
Doherty
Sent: Thursday, January 15, 2009 8:31 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Interior Blind Savings

 

Hello,

I am using eQUEST to determine the potential savings associated with
using interior blinds in a 2-story 1000 square foot lobby area with
floor to ceiling windows on two exterior sides.  The model behaves like
I would expect.  The results indicate the blind open and closed
schedules play a very important role in the savings.  This is especially
true in such a climate where there are cold winters (solar gain into the
interior space is beneficial) and hot summers (solar gain into the
interior space is not desired).  However, the best case savings I can
achieve is around $25.00/year.  I had expected to save more money using
the blinds.  Has anybody else played around with blinds in eQUEST?  Did
you find any significant savings?

 

Josh Doherty

DC Engineering

123 W. Spruce Street

Missoula, MT 59802

Phone: (406) 829-8828   Ext. 121

Fax:  (406) 829-8829

jdoherty at dcengineering.net

 

 

 

 

 

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