Calculator
How to use the Calculator
Step one: Print out this calculator.
Step two: Measure the area to be air conditioned / heated, including windows, doors etc and what direction they face.
Step three: Write the measured value into the appropriate line of column A
Step four: Multiply the value in column A by the most appropriate multiplying factor in column B and write your answer in the Cooling load column.
Step five: Add up the totals in the Cooling load column to get the Sensible cooling load (W)
Step six: Multiply the sensible cooling load x 1.3 to get the required thermal cooling capacity.
Step seven: Select a heat pump to match or better the required thermal cooling capacity.
Room Air Conditioner Heat Load Estimator | ||||||
| Heat Source |
(A) Floor area m2 |
(B) Multiplying factor W/m2 |
Cooling Load (A) x (B) Watt | |||
|
Area of Windows |
Exposed to Sun | Fully shaded | ||||
|
No awnings No Curtains No Blinds |
No awnings or curtains or blinds |
Awnings curtains blinds |
||||
| South | 120 | 95 | 65 | 60 | ||
| South East | 380 | 260 | 130 | 60 | ||
| East | 430 | 300 | 145 | 60 | ||
| North East | 370 | 260 | 130 | 60 | ||
| North | 270 | 190 | 100 | 60 | ||
| North West | 370 | 260 | 130 | 60 | ||
| West | 430 | 300 | 145 | 60 | ||
| South West | 380 | 260 | 130 | 60 | ||
|
Outside wall area less glass |
Exposed to the sun |
Brick, brick veneer, weather board, fibro |
35 |
|||
| 40 | ||||||
|
Not exposed |
Brick, brick veneer, weather board, fibro | 15 | ||||
| 15 | ||||||
|
Internal wall area |
8 |
|||||
| Ceiling area | Uninsulated 50 |
Insulated 8 |
||||
|
Suspended floor area |
Uncarpeted 12 |
Carpeted 6 |
||||
| Door area | Closed when not in use |
100 |
||||
| People | Sitting or sleeping |
120 W/person |
||||
| Active | 250 W/person | |||||
|
Lights Appliances |
Power / lights |
20 W/m2 |
||||
| Sensible Cooling Loat (Watt) | ||||||
| Required thermal cooling capacity = Sensible cooling load x 1.3 | ||||||
|
Cooling Load Check Figures (watts/m2 floor area) | |||
| Apartments | 120 | Food Store | 160 |
| Banks | 175 | Hotel Room | 120 |
| Hairdressers | 215 | Library | 150 |
| Cafateria | 350 | Mall | 135 |
| Classroom | 95 | Medical Off | 185 |
| Clothing Store | 165 | Office Gen | 170 |
| Computer Room | 480 | Office | 100 |
| Conference Room | 275 | Restaurant | 330 |
| Dept Store | 150 | Theatre | 280 |
Disclaimer
The above calculator is to be used as a guide only. We strongly recommend that you contact a qualified installer to carry out a heat load calculation and offer you a free, no obligation quotation before proceeding. Please note there are many variables that could affect the results of a heat load calculation, your qualified installer will be able to advise you of these variables.