Transcript www.indowwindows.com

Mean Radiant Room
Temperature
Indow and Energy Savings
•
Indow inserts have a dramatic effect
on energy loss in the home or
building by air sealing the window
opening, and increasing the R-Value
of the window opening. This
eliminates draft, convective loops,
and provides direct cost savings.
•
Indow inserts generally outperform
estimated savings in practical
application due in large part to the
effect that they have on mean radiant
room temperature.
What is Mean Radiant Room
Temperature?
• There are many surface
temperatures in a room the ceiling, the floor, the
windows. Mean radiant
room temperature is the
average of all these
temperatures.
Thermosta
Window
34º
t
68º
Person
91º
Floor
50º
Mean Radiant Temp =
51º
Why is that important?
• A person loses their body heat
to colder surfaces in the room
and ends up feeling cold. So
bringing that mean radiant
room temperature up is the key
to increasing comfort.
Window
Thermosta
34º
t
68º
Person
91º
Floor
50º
Mean Radiant Temp =
51 º
When you install an Indow insert…
• You increase the surface
temperature of the window
because you are doubling its R
value.
• The mean radiant room
temperature is increased even
though the other surface
temperatures have stayed
consistent. This means we lose
less body heat in the room, and
stay comfortable without turning
up the thermostat or putting on
a sweater.
Window
68º
Thermosta
t
68º
Happy
Cat
Person
91º
Floor
50º
Mean Radiant Temp =
62 º
Pilot test with Portland State
University
• Prime example of how Indow
inserts make an impact on a
customers home and wallet.
• 4 pilot homes in Portland over a
year, modeled an 11% energy
savings
Actual energy savings almost
20%!
• Out performed modelling software by twice due
to the fact that the customer was not turning up
the thermostat as much because they were not
losing their body heat to cold glass windows.