Mitsubishi Electric PUHY-P250YHM-A Data Book page 43

(2-3) Calculating the Load and Selecting a Model
Calculate the temperature difference by setting the outdoor temperature; then, calculate hourly loads.
The chart shows the result of a calculation, supposing that the system reaches its highest load at 12 o'clock.
Outdoor temperatures in this example Summer : 32˚CDB relative humidity 60%
1 Load (in the summer with air-conditioning)
< Sensible Heat > SH
Computer
Lighting
Number of people in the room
Infiltration draft
Outer wall (heat transmission)
Windows (radiation)
Windows (heat transmission)
Inner wall(heat transmission)
Outside air
< Latent Heat > LH
Infiltration draft
Number of people in the room
Outside air
2 Necessary Air Circulation
26800
V =
0.336 ✕ (24 -18)
3 Model Selection
PUHY-P250YHM-A ✕ 2, PFD-P500VM-E type
Indoor ˚CDB 24˚C / Indoor ˚CWB 17˚C
Capacity of the Moment 54.3kW SHF = 0.92
Capacity of Sensible Heat 54.3 ✕ 0.92 = 49.9/kW
Standard Air-Flow Volume: 320m
Winter : -2˚CDB relative humidity 42%
1,800W
✕
5 persons 64 (U)
✕
3
(0.2 times/h) 39.6m 0.336
✕ ✕
2
8.5m 3.6 8
✕ ✕
2
13.5m 0.65 188
✕ ✕
13.5 5.93 8
✕ ✕
61.6 2.05 4
✕ ✕
3
125m 0.336 8
✕ ✕
39.6 834 0.0117
✕
5 persons 82
✕ ✕
3
125m 834 0.0117
÷ 60 = 221m
3 /min
outdoor ˚CDB 32˚C
/min can be accommodated with PUHY-P250YHM-A ✕ 2 and PFD-P500VM-E.
3
39
20.9 kW
1.8 kW
0.32 kW
✕
8 0.11 kW
0.25 kW
1.91 kW
0.64 kW
0.5 kW
0.34 kW
26.8 kW
Total
0.39 kW
0.41 kW
1.22 kW
2.0 kW
Total
Total load is 28.8kW