How to choose an air conditioner by performance

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To select the necessary air conditioners, it is necessary to calculate the heat surplus of the premises, which includes the generated heat from solar radiation, lighting, people, office equipment, etc..

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We determine for each room:

a) The heat surplus of the room Q1, depending on the volume, is calculated by the formula:

Q1 = V * q
V = S * h

where S is the area of ​​the room (m2), h is the height (m)
q = 30 W (if there is no sun in the room); 35 W (average); 40 W (if large glazing on the sunny side).

b) We calculate the excess heat from the office equipment located in the room – Q2.

On average, 300 W is taken for 1 computer, or approximately 30% of the equipment power consumption.

c) Excessive heat from people in the room – Q3:

1 person – 100 W (for office space); 100-300 W (for restaurants, premises where people are engaged in manual labor).

Qtot. = Q1 + Q2 + Q3

We select one or several air conditioners that add up to the same or somewhat greater cooling capacity.

Example:

Initial data: office space – 54 m2; room height – 3 m; number of people – 9 people; 3 – computer:

Q1 = 54 * 3 * 35 = 5670 W
Q2 = 3 * 300 = 900 W
Q3 = 9 * 100 = 900 W

Q total od. = 7470 W

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