Calculate air conditioning capacity

Calculate air conditioning capacity

Choosing an air conditioning system means choosing how much power you need. Especially if you have a fixed air conditioning system installed, this is important. You do not want a device with too little capacity for the room you want to climate. Also a device with a too high capacity is not pleasant, because of the draft that arises (not counting the higher costs). A good company in refrigeration technology can advise you, but you can also easily calculate the required power yourself.

Calculate air conditioning capacity
A system that has too little capacity will soon disappoint and a system with too much overcapacity is also not convenient. You just want a comfortable living or workplace. Using the simple formula below you can calculate in 3 steps how much 'aircopower' you need.

Step 1: the content of the room to be cooled
Calculate the contents of the room in cubic meters (length x width x height). For example: your room is 6 meters long, 4 meters wide and 2.5 meters high. The calculation then becomes 6 x 4 x 2.5 = 60 m3.

Step 2: the multiplication factor
Depending on the characteristics of the room, you use a multiplication factor of 30, 40 or 50. 30 stands for spaces that are well insulated and have few windows. There are also few heat sources here. This is the space that remains reasonably cool in the summer. 40 stands for areas that are less well insulated, that have many windows or where you use a lot of equipment such as printers and computers. You use the highest factor (50) for attic floors, rooms with flat or sloping roofs or rooms with lots of windows and lots of equipment. When in doubt choose the best for the highest factor.

Step 3: multiply the content with the factor
Now take the number from step 1 and multiply it with the chosen factor from step 2. For example: 60 m3 multiplied by a factor 40 (an average warm space) will be 2400 Watt or 2.4 kW. To cool this space properly, you need an air conditioning system with a capacity of 2.4 kW. The rule of thumb is that you need 30 to 50 watts of cooling capacity per cubic meter of space.

Cooling capacity in BTU
In addition to the cooling capacity in kW's, you also sometimes encounter the term BTU. This stands for 'British Thermal Units'. 1 Watt equals 3,4121 BTU. So 2000 watts of cooling capacity is the same as more than 6800 BTU. Many BTUs are so tasty (and this unit of measurement is therefore mainly used in mobile air conditioners), but in practice not so much. 1 BTU corresponds to the amount of heat required to raise 1 British pound (0.45 kg) of water 1 degree Fahrenheit (0.56 ° C) in temperature.

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