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Refrigeration equipment

Why should install exhaust fans for air-conditioned rooms?

Air-conditioned rooms are usually enclosed rooms, the presence of people and objects giving rise to factors that pollute the air such as dirt, moisture, mold, especially the inhalation of air. Humans increase the concentration of CO2 in the room. The concentration of CO2 in the fresh air is about 0.04%, the increase in CO2 concentration above 0.15% will affect the nervous system, causing fatigue, drowsiness, higher concentrations will cause danger to the child. people in that space. So installing exhaust fans to remove the polluted air and replenish clean air is essential in air-conditioned rooms.

Sources of air pollution in the room

Human breathing, cigarette smoke, odors and dead cells released by the body

Dirt, odors, mold, bacteria arise from the walls and from other objects in the room

Electrical appliances create CO sources that are more toxic than CO2 …

Pollutants that are dissolved or suspended in the air inhaled daily by humans will have negative effects on health.

How to remove polluting air

To remove polluted air, we can suck the air out of the room or supply clean air into the room.

In civil, people often use exhaust fans to suck air out of the room, fresh outside air will automatically flow into the room through the gaps of the room. This method is simple, inexpensive, but the quality of the inlet air is not high, because the source of the outside air cannot be controlled. This only deals with the fresh air supply and removes the polluted air from within but can bring in dust and other sources of pollution from the outside. Good intake air quality depends on the air quality at the room openings.

The best way is to use a fan system to blow fresh air from the outside and a fan to suck the polluted air out or let the polluted air automatically escape through the openings. This method controls the quality of the incoming air well because it is possible to choose the location to take fresh air and filter out dust, but it will be more costly and requires a professional person to do it.

How much air pollution should be disposed of?

The disposal of polluted air will reduce the cold room and the air conditioner has to work more, causing electricity consumption. So how much air should be sucked out is reasonable? The answer is: depending on the purpose of the room and the intensity of human activity in it, there will be corresponding parameters.

According to the design standards of ventilation, for spaces such as family rooms, offices, hotels (non-smoking), the ventilation coefficient (*) can be 18-20m3 / h / person. This means that 18-20m3 of air will be enough for a person to stay in a comfortable, enclosed room for 1 hour.

(*) Ventilation means supplying air in and releasing air out. For other spaces, users should contact specialized units for assistance, as ventilation is a complex area requiring in-depth experience and knowledge, this HUNGTRI article only covers Simple civil application.

For example: a bedroom with 2 people, the amount of air that needs ventilation is: 2 * 20 = 40m3 / h.

Choosing the method of exhausting or blowing in is depending on the economic needs of each person, but should choose a fan with a flow equivalent to the calculated value above. Choosing too big fan will make the room lose cold and spend more electricity to run the air conditioner, choosing too small fan will not handle the requirement to remove polluted air.

Common types of exhaust fans

On the market today, there are quite a few types of ventilation fans and industrial of famous brands such as Panasonic, Daikin, Wington, Onchyo … these fans all have flow parameters for each product, users Just choose the right fan with the calculated parameters.

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