how do u calculate the airconditioning cooling capacity of a room?

Answer 1

Well it’s not too difficult….

You measure the room LxBxH (length x breadth or width x height) is ??? m³

Example:
The room is 6 meters length x 5 meters width and 2,5 meter height = 75 m³

So, your airco-system should be able to manage a space of 75 m³.
But the difficulty is for what purpose?

- In the house, bedroom, etc…
- Computer room

Short said: are there any other systems in that room which will generate heat…. If so, you should consider that as well… and therefore it becomes a minimum of 75 m³

And how quick the system should be cooling the room…..

Are there any exits, how often they are used….

Answer 2

Cooling Capacity

Answer 3

See: http://www.eere.energy.gov/consumer/your_home/space_heating_cooling/index.cfm/mytopic=12420


Sizing and Selecting a Room Air Conditioner

The required cooling capacity for a room air conditioner depends on the size of the room being cooled: Room air conditioners generally have cooling capacities that range from 5,500 Btu per hour to 14,000 Btu per hour. A common rating term for air conditioning size is the "ton," which is 12,000 Btu per hour.

Proper sizing is very important for efficient air conditioning. A bigger unit is not necessarily better because a unit that is too large will not cool an area uniformly. A small unit running for an extended period operates more efficiently and is more effective at dehumidifying than a large unit that cycles on and off too frequently.

Based on size alone, an air conditioner generally needs 20 Btu for each square foot of living space. Other important factors to consider when selecting an air conditioner are room height, local climate, shading, and window size.

Verify that your home's electrical system can meet the unit's power requirements. Room units operate on 115-volt or 230-volt circuits. The standard household receptacle is a connection for a 115-volt branch circuit. Large room units rated at 115 volts may require a dedicated circuit and room units rated at 230 volts may require a special circuit.

If you are mounting your air conditioner near the corner of a room, look for a unit that can direct its airflow in the desired direction for your room layout. If you need to mount the air conditioner at the narrow end of a long room, then look for a fan control known as "Power Thrust" or "Super Thrust" that sends the cooled air farther into the room.

Other features to look for:

A filter that slides out easily for regular cleaning
Logically arranged controls
A digital readout for the thermostat setting, and
A built-in timer.

Answer 4

In addition to the first answer, he gave you good info for the sensible loads. For an airconditioning system, there is also a latent load, which comes from people and from any outside air being used. Some appliances generate a latent load, coffee pots, showers, etc.

This latent loads needs to be calculated so you can pick the correct air conditioning system to use. Latent load is related to the amount of water vapor in the air.

Answer 5

The detailed procedure is available in ASHRE handbook. The steps are
find heat input from each electrical/ other equipment within room.
find heat loss from the room thru walls/roof.
findhuman occupancy contibuting body heat and humidity.
find fresh supply air requirement and heat input thru it.
sum up all this for the sensible heatload of the room.