Heat Loss Calculation Application: Excellent when determining heat loss of a building as a whole.
This calculation will help determine a boiler size for a home.
This is to be used as an estimation. A detailed heat loss should be provided before a new boiler is installed.
Heating multipliers (H.M.) BTU/Hr based on 60 degrees F Temperature Difference (T.D.)
Procedure
- Measure the total length of all outside walls for the house. Calculate gross wall area by multiplying total length by height of the walls.
- Measure the window and door area. Select proper H.M.
- Record Net Wall Area=(gross wall area minus door and window area) select proper H.M.
- Measure the ceiling area and select H.M.
- Measure floor area and select H.M. ( H.M. of 4 used over unheated basement )
- Multiply Floor area by ceiling height to obtain volume of home and select proper air change factor: 1.61 for Loose House – 1.07 for Average House – .81 for Tight House.
Windows/Doors | H.M. | Wall | H.M. | Ceiling | H.M. | Floor | H.M. | Infiltration | H.M. |
---|---|---|---|---|---|---|---|---|---|
Single | 67 | No Insulation | 15 | 3 Inches | 5 | No Insulation | 4 | 1 ½ Air Change | 1.61 |
Single Insulated | 41 | 2 Inches | 6 | 6 Inches | 4 | Overhang 3” | 5 | 1 Air Change | 1.07 |
Storm | 34 | 4 Inches | 5 | 9 Inches | 3 | Overhang 6” | 5 | ¾ Air Change | 0.81 |
Double Insulated | 30 | 6 Inches | 4 | 10 Inches | 2 | Overhang 9” | 2 |
Windows/Doors | H.M. |
---|---|
Single | 67 |
Single Insulated | 41 |
Storm | 34 |
Double Insulated | 30 |
Wall | H.M. |
No Insulation | 15 |
2 Inches | 6 |
4 Inches | 5 |
6 Inches | 4 |
Ceiling | H.M. |
3 Inches | 5 |
6 Inches | 4 |
9 Inches | 3 |
10 Inches | 2 |
Floor | H.M. |
No Insulation | 4 |
Overhang 3” | 5 |
Overhang 6” | 5 |
Overhang 9” | 2 |
Infiltration | H.M. |
1 ½ Air Change | 1.61 |
1 Air Change | 1.07 |
¾ Air Change | 0.81 |
Total Room/Building | ||
---|---|---|
Length | = | |
Width | = | |
Height | = | |
Windows/Doors | ||
Total Area (ft2) | = | |
|
Total Room/Building | Area (feet2) | H.M. (BTU/Hr.) | |
---|---|---|---|
1. Windows & Doors | X | ||
2. Net Walls | X | ||
3. Ceiling | X | ||
4. Floor | X | ||
5. Infiltration | X | ||
|
Based On | Area (feet2) | H.M. (BTU/Hr.) | Heat Loss | |||
---|---|---|---|---|---|---|
1. Windows & Doors | X | = | ||||
2. Net Walls | X | = | ||||
3. Ceiling | X | = | ||||
4. Floor | X | = | ||||
5. Infiltration | X | = | ||||
Total Heat Loss for 60° F Temp. Diff. | = | |||||
Total Heat Loss for 70° F Temp. Diff. | = | |||||
Total Heat Loss for 80° F Temp. Diff. | = | |||||
Total Heat Loss for 90° F Temp. Diff. | = | |||||
Total Heat Loss for 100° F Temp. Diff. | = | |||||