83
HEATING LOAD FORM
FRIEDRICH ROOM UNIT HEAT PUMPS
BTU/HR
PER
WALLS:
(Linear Feet)
°F TEMP. DIFFERENCE
2” Insulation
Lin. Ft. x 1.6
Average
Lin. Ft. x 2.6
WINDOWS & DOORS
(Area, sq. ft.)
Single Glass:
Sq. Ft. x 1.13
Double Glass:
Sq. Ft. x 0.61
INFILTRATION - WINDOWS & DOORS: AVG.
Lin. Ft. x 1.0
Loose
Lin.
Ft.
x
2.0
CEILING
: (Area, Sq. Ft.)
Insulated (6”)
Sq. Ft. x 0.07
Insulated (2”)
Sq. Ft. x 0.10
Built-up Roof (2” insulated
Sq. Ft. x 0.10
Built-up Roof (1/2” insulated)
Sq. Ft. x 0.20
No Insulation
Sq. Ft. x 0.33
FLOOR:
(Area, Sq. Ft.)
Above Vented Crawl space
Insulated (1:)
Sq. Ft. x 0.20
Uninsulated
Sq.
Ft.
x
0.50
* Slab on Ground
Lin. Ft. x 1.70
1” Perimeter insulation
Lin. Ft. x 1.00
* Based on Linear Feet of outside wall
TOTAL HEAT LOSS PER °F BTU/HR/°F
Multiply total BTU/HR/°F X 30 and plot on the graph below at 40°F. Draw a straight line from
the 70 base point thru the point plotted at 40°F. The intersection of this heat loss line with the
unit capacity line represents the winter design heating load.
