The main task of climate technology is cooling, therefore, when buying equipment, it is necessary to focus primarily on this indicator. To ensure high-quality cooling, it is necessary to take into account the relationship between the power of the air conditioner and the area of the room.
Power consumption or cooling of the air conditioner?
These indicators must be distinguished when selecting an air conditioner according to the area of the room. The cooling rate is always higher than the power consumption. So, with a consumption of 0.7 kW, the air conditioner cools the area with a power of 2 kW. this difference is explained by the principle of operation of the air conditioner.
Calculation of the cooling capacity of the room
To calculate this indicator for choosing an air conditioner from the area of the room is simple, expressed in kilowatts:
Q = Q1 + Q2 + Q3
Q1 - heat penetrating from all planes in the room is calculated by the formula:
S * h * q / 1000,
hereS – room area in square meters,h – ceiling height in metersq – a special coefficient, selected based on the illumination of the room from 30 to 40. The maximum value is used for rooms with large windows facing south. Minimum - for dark shady rooms.
Q2 - heat coming from people: 0.1 kW at rest, 0.13 kW at minimum load, 0.2 kW during physical work.
Q3 - heat coming from the equipment: computer - 0.3 kW, TV - 0.2 kW. To calculate the heat gain from other types of equipment, it is necessary to multiply the maximum power by 0.3.
When selecting an air conditioner according to the room area, it should be taken into account that its cooling capacity can be 5% less or 15% more than the final Q value.
Such a calculation is correct only for halls with an area of not more than 70 square meters. meters located in standardly insulated buildings. If it is necessary to select the power of the air conditioner and the area of the premises of an industrial enterprise, large public building or non-capital building, specialists should do it.
Calculation of heat gain from vents
According to the above calculations, the equipment should work with closed doors and windows.
The manufacturer will certainly warn about this in the instruction manual. But the operation of the ventilation system does not violate the function of the climate equipment. This is explained by the fact that, knowing the power of ventilation equipment, it is possible to accurately determine the air flow per unit time and take it into account when choosing an air conditioner from the area of the room.
But no engineer will be able to calculate the amount of air entering the room through an open window or window in different weather conditions. It is possible to provide yourself with fresh air without turning off the air conditioner.
To do this, open the window, and close all doors and windows. The flow of air from the street will be negligible. But the duration of ventilation should not be long.
Fans of frequent airing can be recommended to increase the estimated cooling capacity by another 1 \ 4 - 1 \ 5. It should be noted that with such an operation, the amount of electricity consumed increases by 10 - 13%
