Friedrich 2008 Heating Load Form Friedrich Room Unit Heat Pumps, WINDOWS & DOORS Area, sq. ft

HEATING LOAD FORM

FRIEDRICH ROOM UNIT HEAT PUMPS

WALLS: (Linear Feet)	BTU/HR PER
	°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.

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