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Design & installation Guide For McQuay MDS Multi System
Selection
CHAPTER
3
3.1 Load Calculation
3.1.1 Planning and Cooperation
McQuay recommends you to estimate and plan the following before engineering.
Based on the air conditioning area function, calculate cooling/heating load (depending on the
temperature,humidity, and ventilation).
Query related meteorologic information, especially the sun light, wind direction in winter and
summer, the ambient cooling/heating sources, and other external factors that may affect the
running of the units. Then decide the place and azimuth to place the units based on the
environmental factors favoring the normal running of the units. For the outdoor meteorologic
parameters of each city in China, see
Annex 1 Outdoor meteorologic parameters of major
cities in China . However, the description about selection in this manual is only for your
reference; for actual engineering, please consult with a professional design institute or related
construction unit in this area.
Develop the project schedule, plan the installation space of the unit, and adjust the engineering
associated with the constructional engineering and inside finishing.
Through field survey, ascertain the size of the entrance for the air conditioner, the weight
capacity of the place to put or hang the equipment, the range of the auxiliary engineering, and
the location of the power supply.
Check and verify the calculated of the design. Confirm and determine the model and specifications
of the unit.
3.1.2 Cooling Load Calculation
The cooling load of the air conditioning area is determined by the real-time maximum cooling
load or accumulated calculated cooling load of each room based on the area, storey height,
and usage of the room serviced. It also includes the additional cooling load caused by the
ventilator blower, the exhauster, and the air pipe system. In actual engineering, the total
cooling load is calculated as follows:
Q
total
= F
1
q
1
+ F
2
q
2
+ + F
n
q
n
Where,
F
1
-----The air conditioning area of each calculated unit (Unit: m
2
.)
q
1
-----The cooling load per unit area of each calculated unit (Unit: W/m
2
).
Annex 2 (1) lists the estimated indexes and design parameters of the air conditioner cooling
load of different buildings for your reference.
3.1.3 Heating Load Calculation
The heating load of the air conditioning system is closely related with the heat insulation
performance of the walls, doors and windows, and roof. It is also affected by the penetration of
cool wind from outdoors, open frequency of the outside door, and the use of the indoor
appliances. It is calculated basically in the same way as the cooling load. If the heating load per
unit area of the building q
F
is known (see Annex 2), the heating load of the building is as follows:
Q = Fq
F
Where,
F -----The construction area (Unit: m
2
)
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