Central air-conditioning system design

- Sep 16, 2020-

Air conditioning load calculation

Air conditioning load calculation provides a basis for the reasonable selection of air conditioning terminal processing equipment and the determination of the capacity of cold and heat source equipment. Air conditioning load calculation includes summer cooling load calculation and winter heat load calculation. At the stage of scheme design, load estimation index can be used for load calculation. In the construction drawing design stage, according to the requirements of the specification, the load calculation of each air-conditioned room shall be carried out item by item and hour by hour.

When determining the air-conditioning load, for houses and other rooms that are dominated by the envelope structure load, the intermittent load additional coefficient 1.10-1.20 should be considered. At the same time, the load caused by temperature difference heat transfer when the adjacent room has no air conditioning should also be considered.


When determining the total load of the air-conditioning system, full consideration should be given to the particularity of residential use. A house is mainly composed of a bedroom, a living room, a dining room, a kitchen, and a bathroom. The kitchen and bathroom are generally not equipped with air conditioning, and the probability of opening an account for the bedroom, living room and dining room at the same time is very small. Therefore, the simultaneous use coefficient is relatively low, and generally can be selected from 0.5 to 0.7.


The fresh air load should also be considered when calculating the load. The air conditioning system without the introduction of fresh air is not a complete household central air conditioning system.