Convenient Formulas For Air Conditioning Capacities; Table 4.8 Convenient Formulas For Air Conditioner Capacity - Fujitsu M10 Series Installation Planning Manual

CHAPTER 4 Air Conditioning
Table 4.7 Examples of underfloor-ventilation air conditioner cooling capacity
calculations (2/2)
Item
Enthalpy of the air
coming out of the air
conditioner
Air conditioner sensible
heat cooling capacity
(when calculated on the
basis of sensible heat
enthalpy difference)
4.4.4

Convenient formulas for air conditioning capacities

Table 4.8
computer room. Because a proportion of the thermal load comes from sensible heat,
the capacity and number of air conditioners required can be determined by calculating
the flow rate requirement relating to sensible heat. Actual air conditioning design
should allow for air conditioner characteristics, building thermal load calculations,
etc.

Table 4.8 Convenient formulas for air conditioner capacity

Air conditioning setup
Room air conditioning
Underfloor ventilation
50
Calculated value
i =39.3 kJ/kg
5
(16.9 Btu/lb)
95.9 MJ/h(90900 Btu/h) at a flow
rate of 220 m /min (7770ft
3
lists convenient formulas for the capacity of air conditioners installed in a
3
Flow rate (m /min)
3
Flow rate (ft /min)
Flow rate (m /min)
Flow rate (ft /min)
Determine the enthalpy at 18C (64.4°F)
and 65% RH from the air-line diagram.
(i - i
1
3 =6.1(kJ/kg)  220 (m
/min)
 60 (min/h) / 0.84 (m
=2.6(Btu/lb)  ft
60 (min/h) / 13.5 ft
Flow rate calculation formula
Thermal load (kJ/h)
. .
=
1.0/0.84 (24 C-11 C) 0.9 60
Thermal load (Btu/h)
. .
=
0.24/13.5 (75.2 F-52 F) 0.9 60
. .
3
=
1. 0/0 .8 4 (2 4 C-1 8 C) 60
. .
3
=
0. 24 /13 . 5 (75 . 2 F- 64 . 4 F) 60
Calculation method
)  Flow rate/Specific volume
5
/min)
3
/kg)
3
3
/min)
3
/lb)
Thermal load (kJ/h)
Thermal load (Btu/h)
C120-H007-08EN