Decision on quantity of the unit that are needed

1.Calculation based on theory

first of all, it is required to work out the cooling capacity, humidifying amount, airflow volume that are needed for the specified space according to the normal air –conditioner cooling capacity calculation formula, Then figure out the quantity and models of AIR-CONDITIONER needed for this specified space according to each air-conditioner's maximum cooling capacity, Putting together all these chosen air-conditioner's maximum cooling capacity, the total, in general, should be 10% higher than the designed cooling capacity required for the specified space.

2. Calculation based on experience

a. Definition or room ventilation times: room ventilation times = total airflow distribution volume(m³ /h)(room size(m² )x height between air outlet and ground(m).

b. Normal environment requires ventilation times to be around 25 to 30 tomes/h

c. Some public places thronged with people usually require ventilation times to be around 30 to 40 times/h

d. Production workshops with heat producing and dispensing equipments require ventilation times to be more than 40 to 50 times/h

e. Ventilation times in hot and wet places should be increased, and in hot but dry places should be decreased according, The quantity air-conditioner needed should be more than room cubic x designed ventilation times x airflow distribution volume of each unit.

Decision on installation location for outdoor unit:

a. if condition allows, please install the unit, as possible as you can, in the leading airflow direction of the environment that needs temperature lowering.

b. In general, the unit should be installed in the middle part of the building, trying to make the distribution duct to be as short as possible.

c. the unit can be installed on the wall, in the roof, or outside on the ground, in whatever the place, the surrounding of installation location should be with clean and fresh air, with good ventilation situation, The unit should not be installed in the location like lavatory, kitchen room, where there is stink or some other peculiar smells coming out, if there are not enough windows or doors, discharge machine should be especially installed to make sure the air discharge volume to reach than 80-90% of the airflow distribution volume.

d. At the installation location, it is required that the installation brackets should be strong enough to support the total weight of outdoor unit, distribution duct and the installation people.