HOW TO CHOOSE AIR CONDITIONER

The air conditioner is a rather complicated unit, so it is not enough just to come to the store or hypermarket and, on the advice of the sales assistant, buy the unit that you liked the most.

A / C power

Air conditioners have different power and in the international system it is measured in BTU (British Thermal Unit). This is due to the emergence of the first air conditioners in the United States. But in our country everything is calculated in kW, so in BTU power is defined as: 5000 BTU, 7000 BTU, 9000 BTU, 12000 BTU, etc., or just five, seven, twelfth, which corresponds to about 1.7 kW, 2.0 kW, 2.6 kW, 3.5 kW, etc.

When buying an air conditioner in a non-specialized shop, the seller will ask you only the floor space in which the air conditioner will be located and will boldly advise, for example, “9000 BTU will be enough for your area”. From the point of view of the seller, he will be right! Indeed, in BTU there are averaged areas of the premises, which correspond to the power, but as a specialist he will make a grave mistake and show ignorance of the principle of operation of refrigeration equipment.

How to choose the necessary conditioner for power

All rooms are different in layout, in terms of location relative to the environment, the number of people; by the type of activity of people; by the appearance of all the instruments in the room; lighting and so on. All of the above gives off heat, which the air conditioner must handle, therefore, it is only necessary to determine the power of the necessary air conditioner individually for each room. This will help you with ease, our experts, who accurately determine the required power conditioner.

Installing  an air conditioner …

Air conditioning service …

Approximate calculation of the required power Q:

Q = Q1 + Q2 + Q3 + … Qn

Where: Q1 – inflows of heat from the window, walls, floor and ceiling.

Q1 = S * h * q / 1000

Where:

S – area of ​​the room (m²);

h – room height (m);

q – coefficient equal to 30 – 40 W / m³;

q = 30 for a shaded room;

q = 35 with medium illumination;

q = 40 for rooms in which a lot of sunlight falls.

If direct sunlight comes into the room, then there should be light curtains or blinds on the windows.

Q2 – the sum of the influx of heat from people.

Inflow heat from an adult:

0.1 kW – at rest;

0.13 kW – with light movement;

0.2 kW – during exercise.

Q3 – the sum of the inflows of heat from household appliances.

Heat inflows from household appliances:

0.3 kW – from the computer;

0.2 kW – from the TV.

For other devices, we can assume that they emit 30% of the maximum power consumption in the form of heat (that is, it is assumed that the average power consumption is 30% of the maximum).

The required power Q must correspond to the power of the air conditioner from -5% to + 15%.