Calculate the capacity of Ducted Split | DamaTajhiz HVAC Group

Ducted split or channel ducted split is one of the cooling and heating equipment widely used in residential and office units. Before choosing a Ducted Split, it is necessary to check, among other things, the cooling and heating capacity of the unit, the ventilation volume of the Ducted Split and the single-phase or three-phase electricity required by the unit.

If the capacity of the Ducted Split is chosen lower than necessary, in addition to insufficient cooling and heating, the appliance will have to work harder, putting pressure on the appliance's compressor and reducing its lifespan; if the capacity of the Ducted Split is chosen higher than necessary, in addition to higher electricity consumption and its cost, the compressor will be damaged due to the increased number of times the appliance is switched on and off. Therefore, choosing a Ducted Split with a suitable capacity is one of the basic requirements when purchasing this unit; stay with us to check how to calculate the cooling capacity of the Ducted Split together.

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Capacity and factors of influence of the ducted split

The cooling and heating capacity of the Ducted split represents the cooling and heating capacity of the unit, expressed in Btu/hr. In some cases, the cooling capacity of Ducted splits is expressed in tonnes of cooling, where each tonne of cooling is equivalent to 12000 Btu/hr.

In general, the capacity of Ducted split systems depends on the following parameters:

• The size of the room requirement
• The height of the floor to the ceiling
• The climatic conditions of the region (temperate, hot and dry, Sharjah)
• The flow coefficient of the city (e.g. Tehran has a flow coefficient of 400)
• The location of the unit on the residential floors (in the middle and on the top floor)
• The use of the building (residential, office and commercial)
• The materials used to construct and insulate the building
• The number and size of windows facing the sun
• The angle of sunlight to surrounding windows and walls
• How many people live in the building and how they move around

How to calculate the Ducted split capacity accurately and optimally

When considering the exact calculation of the Ducted split power, the parameters mentioned above are effective in its calculation (in manual formulae or software performed by mechanical designers). However, if we want to quickly and approximately estimate and calculate the required Ducted split capacity, we will proceed as follows:

For moderate weather conditions, the Ducted split cooling capacity in the middle floors of the building is assumed to be about 400 Btu/hr per square metre of building area in Tehran, Karaj, Rasht, Babol, Sari, Mashhad, Isfahan, Shiraz, Kermanshah, Sulaymaniyah, Kirkuk, Latakia, Erbil, Mosul, Aleppo, Mazar-e-Sharif, Kabul, and other similar cities.

For a quick calculation and approximate estimation of the Ducted split capacity, the table below has been prepared. It should be noted that the conditions considered in this table are based on Tehran weather conditions and residential use with a floor-to-ceiling height of 2.8 metres. In addition, these calculations do not take into account the number of occupants, the presence of a glass building with direct exposure to the sun, and the presence of heat-generating electrical appliances; therefore, the calculations in this table are approximate.

Contact the air conditioning experts at DamaTajhiz HVAC Group for a more accurate calculation of the capacity of your Ducted Split.

NOTE: For every 100 to 120 square metres of space, it is better to have one Ducted split. Therefore, if the area is larger than 120 square metres (for example, 200 square metres), two Ducted splits will be required. In addition to optimal energy consumption and better temperature control due to better zoning, a reduction in production noise is also achieved (as the capacity of the Ducted split increases and the airflow is greater, the number of fans and therefore the production noise also rise).

Furthermore, Ducted splits have the possibility of providing heating, usually with the addition of a hot water coil before or after the air intake of the unit, supplying hot water to the heating coil via a package or a centralised motor room.

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Final Speech

We have attempted to calculate or approximate the Ducted split capacity required for residential and office units in this article. We hope that the material presented in this article was useful and practical for you.

You can see and compare types of Ducted splits of different brands and capacities and find current prices on the international website of Demataheez (the first and most trustworthy specialist in building equipment and all air conditioning devices since 2013 with 3 valid business permits). For additional information and calculation of the exact capacity of Ducted splits, you can contact us during office hours at +98 21 88822550 and you will be advised by air conditioning experts of the Demataheez specialist group.

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