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46 C120-H007-05EN
CHAPTER 4 Air Conditioning
4.4.2 Example of cooling capacity calculations for room air
conditioning
Examples of cooling capacity calculations for an air conditioner, flow rate 135 m
3
/min
(4770 ft
3
/min), running in a room air conditioning setup are given below.
The following values have been determined with respect to the rated capacity of 167.4
MJ/h (158,700 Btu/h):
z The cooling capacity is 145.6 MJ/h (138,000 Btu/h), 87% of the capacity rating.
z The sensible heat capacity is 124.4 MJ/h (117,900 Btu/h), 74% of the capacity
rating.
Figure 4.7 shows typical air conditioner characteristics, and Figure 4.8 shows the air
condition in a psychrometric chart.
Figure 4.7 Typical air conditioner characteristics
Figure 4.8 Air condition in a psychrometric chart (for a typical air conditioner)
Table 4.6 summarizes procedures that can be used to calculate the cooling capacities
of a typical air conditioner from its characteristics and psychrometric chart.