Calculating split AC unit capacity | DamaTajhiz HVAC Group

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Cooling and Ventilation Equipment
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As you know, split air conditioners are widely used cooling and heating equipment that can work all year. There are many important things to consider when choosing and buying a split air conditioner, the most important of which is determining the appropriate capacity for each room and lobby.

The air conditioner's capacity is the cooling (and heating) power of the unit, measured in Btu/hr units; the higher the number of BTUs, the greater the capacity of the air conditioner and split. The capacity of air conditioners and splits depends on many parameters, such as

The size of the room
The local weather conditions (temperate, hot and dry, hot and humid)
The location of the unit in the dwelling floors (middle floors and under the roof)
The type of use of the building (residential, office and commercial)
The materials and insulation used in the building
The angle of sunlight about surrounding windows and walls
The number and area of windows to the West, South, and East
How many people need to live in the space, and how do they need to move about

If you need advice on calculating the appropriate air conditioners and splits capacity, contact the air conditioning experts at DamaTajhiz HVAC Group. Stay with us to explain how to calculate the capacity of air conditioners and splits.

Accurate and optimized calculation of cooling capacity

The most critical factor in determining the capacity of air conditioners and split air conditioners is the desired size of the room; for this reason, the basis for calculating the capacity of split air conditioners is the desired size. For temperate climates (Tehran, Rasht, Babol, Sari, Karaj, Mashhad, Isfahan, Kermanshah, Shiraz, Beirut, Sulaymaniyah, Erbil, Mosul, Aleppo, Mazar Sharif, Kabul, Latakia, Kirkuk, and so on), the capacity of the split air conditioner should be based on the size of the room. In central apartment units), a capacity of 400 to 600 btu/hr per square meter is required. For example, a split with a capacity of 9000 btu/hr will be a good choice for a 12-metre room on the middle floors of the apartment.

In moderate weather conditions and the cities mentioned above, on the top floors where the roof is located, due to the direct solar radiation, more capacity is taken into account (about 10 to 15 %), and the capacity is 600 to 800 Btu/h. For example, in a 12 m room (on the top floor), a gas or split air conditioning unit with a capacity of 9000 Btu/h is suitable.

In areas with a hot and dry climate, such as the cities of Yazd, Kerman, Zahedan, Zabul, Medina, Karbala, Najaf, etc., per square meter of area (for the medium class), the capacity is 500 to 700 BTU/hr and in a hot and humid climate (sharji) such as the cities of Ahvaz, Bandar Abbas, Abadan, Bushehr, Kish, Basra, Dubai, Doha, Kuwait, Muscat, Karachi, Sharjah, Jeddah, Baghdad, Riyadh, Damascus, Sanaa, Mecca and so on. The capacity for each square meter (in the middle floors) is 600 to 800 Btu/hr.

The table for calculating the capacity of air conditioners according to the following size has been prepared to facilitate the approximate calculation of the capacity of air conditioners and splits in moderate weather conditions:

Capacity of the split AC unit or ducted split (BTU)	Size of infrastructure for the floor under the roof	Infrastructure sizes for other floors
9000	Up to 12 square metres	Up to 15 square metres
12000	Up to 17 square metres	Up to 22 square metres
18000	Up to 25 square metres	Up to 35 square metres
24000	Up to 34 square metres	Up to 45 square metres
32000	Up to 45 square metres	Up to 64 square metres
45000 ایستاده	Up to 55 square metres	Up to 75 square metres
60000 ایستاده	Up to 75 square metres	Up to 100 square metres
90000 ایستاده	Up to 110 square metres	Up to 150 square metres

Note: In areas with hot and humid weather (Sharji) and where there is a possibility of the condenser surface rotting near the air, it is recommended to use Bluefin or Goldfin condensers; in this way, the Bluefin and Goldfin coating acts as an impermeable insulation and increases the unit's life.

It should be noted that some designers believe that using this feature will reduce heat exchange and efficiency (by 5-10%).

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Final Speech

In this article, we have tried to calculate or approximate the capacity of A/C units and splits in different weather conditions of the cities mentioned in the above three groups.

If you're interested in viewing and comparing different types of gas and split air conditioning units of other brands and capacities and finding out the latest prices, please visit the website of DamaTajhiz HVAC Group (the first and most reliable DamaTajhiz HVAC Group in the field of building installation equipment and all air conditioning units since 2013, with three valid business permits). For more information, please call +98 21 88822550 during office hours. The air conditioning experts of DamaTajhiz HVAC Group will advise you.

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