SIS Air Solar Heater
Retscreen Performance Estimate
Radiative Conductive
Total
Compared to
Heat
Heat
Heat
Single Pane
Indoor
Window Construction
Loss
Loss
Loss
Heat Loss
Glass
(Btu/hr/ft2) (Btu/hr/ft2) (Btu/hr/ft2)
Reduction
Temp(°F)
Single Pane
Clear
35
21
56
----
26
Double-Pane
Clear
21
13
34
39%
44
Double-Pane
Low-E
5
15
20
41%
54
Double-Pane
Low-E Argon
2
16
18
47%
56
Triple-Pane
Low-E
2
11
13
62%
59
Triple-Pane
Low-E Argon
1
11
12
65%
60
In house windows, the U factor is the rate of heat loss, through the glass of the window, from inside the house to the outside. The heat
loss rate depends on the difference between the temperature inside the room and outside the house. Double glazing, Low E, some tints,
reduce the heat loss through the window.
The SIS Solar Air Heater, mounted inside the room, behind the window glass, reverses this heat loss, collects the solar heat coming
through the glass, and heats the air in the room. Ordinary single glazing works best with a Solar Air Heater.
IMPORTANT
The SIS Consumer Model is designed for interior use, inside a single pane south-facing
window, and not for outdoor applications.
Double pane, Low-E, Triple Pane, all reduce the amount of solar heat that enters the
window. The efficiency of the interior air solar heater will decrease, compared the single
pane windows.
The SIS Consumer Solar Air Heater, mounted inside the room, behind the window glass, reverses
this heat loss, collects the solar heat coming through the glass, and heats the air in the room.
Issue 1-3-2013
Summary of Contents for SIS C25M 1848
Page 6: ......
