AIR-CONDITIONING COOLING LOAD ESTIMATION

1. "Rule of Thumb" Method

This method is simple to understand and use. However, it only provides a rough guideline on theestimation of cooling load requirement for the conventional window or split air-conditioningsystem.

2. Procedures

The procedures are as follows:

a) Determine the function of the room (assuming there is no over-crowding of occupants and / orheat generating equipments).

b) Measure the floor area (A) of the room in either in square feet or square meter (a standardheight of about 8.5 feet or 2.65 meter between the floor and false ceiling shall be assumed for theroom).

c) Depending on whether you are using the imperial ( square feet ) or metric ( square meter )system of measurement, decide on which Factor (F) to use from either Table X or Table Y asshown below:

Table X ( Using Imperial system of measurement )

Function / Purpose Of Room Factor (F) in Btu/Hr per Square

Feet

Remarks

Room without small heat generatingmachines (such as work stations,photocopying machines, etc) and is notexposed to strong solar heat.

55 to 60 -

Room without small heat generatingmachines and is exposed to strong solarheat.

70 to 80 -

Room with small heat generating machinesand is not exposed to strong solar heat.

60 to 70 -

Room with small heat generating machinesand is exposed to strong solar heat.

80 to 90 -

Room with larger heat machines* and isexposed to strong solar heat.

Subjective. Plsecheck with qualifiedpersonnel.

*Necessaryto obtainmachinesheat output

Table Y ( Using Metric system of measurement )

Function / Purpose Of Room Factor (F) in Btu/Hr per Square

Metre

Remarks

Room without small heat generatingmachines (such as work stations,photocopying machines, etc) and is notexposed to strong solar heat.

592.02 to 645.83 -

Room without small heat generatingmachines and is exposed to strong solarheat.

753.47 to 861.11 -

Room with small heat generating machinesand is not exposed to strong solar heat.

645.83 to 753.47 -

Room with small heat generating machinesand is exposed to strong solar heat.

861.11 to 968.75 -

Room with larger heat machines* and isexposed to strong solar heat.

Subjective. Plsecheck with qualifiedpersonnel.

*Necessaryto obtainmachinesheat output

d) Multiply (A) by (F) to get the estimated air-conditioning cooling load requirement.

3. Worked Example

For example 1 - Using imperial system of measurement:

Assume that the room is to be occupied, used with some small heat generating equipments andis not exposed to strong solar heat.

Assume that the measured floor area (A) is about 200 square feet.

As can be seen from the factor (F) of Table X, the factor ranges from 60 to 70. Assume that thefactor of 60 Btu / Hr per square feet is selected by the user.

Therefore, the estimated air-conditioning cooling load requirement works out to be about:

= (A) x (F)

= 200 x 60

= 12,000 Btu / Hr

For example 2 - Using metric system of measurement:

Assume that the room is to be occupied, used with some small heat generating equipments andis not exposed to strong solar heat.

Assume that the measured floor area (A) is about 18.58 square metre.

As can be seen from the factor (F) of Table Y, the factor ranges from 645.83 to 753.47. Assumethat the factor of 645.83 Btu / Hr per square metre is selected by the user.

Therefore, the estimated air-conditioning cooling load requirement works out to be about:

= (A) x (F)

= 18.58 X 645.83

= 12,000 Btu / Hr

( Do Your quick calculation Online ! )

The Air-conditioning Cooling Load Estimation

Enter Floor Area And Factor Below:

A= Area

F= Factor

Get factor from Table X if area is in square feet.Get factor from Table Y if area is in square meter.

Get Cooling Load (Btu/Hr) .

Reset

Disclaimer

Please be informed that the above information and data pertaining to the estimation of air-conditioning cooling load requirement serve as rough guidelines for general information purposeonly. A detailed estimation of the heat load based on an accurate survey of the space to be air-conditioned must follow.

By making such information and data available, the WITS Team "Harmony" (hereafter called the"Providers") are not giving or purporting to give or representing or holding themselves out asgiving professional advice. The onus rests entirely with the User(s) or anyone else to seekrelevant professional advice before making any such decision leading to the purchase of an air-conditioning system.

While effort has been made to obtain information and data from sources believed to be reliable,the Providers cannot and do not make any representation or warranty as to the accuracy,completeness or timeliness of such information and data.

The Providers and its affiliates will accept no liability or responsibility for any loss suffered orinconvenience experienced by the User(s) or anyone else arising out of the use of or reliance onsuch information and data. By making use of such information and data, the User(s) or anyoneelse shall be deemed to have indemnified the Providers and its affiliates against such liability orresponsibility.