Mitsubishi Electric GUG-01SL-E, Техническое руководство

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57
CHAPTER
9
Model selection and capacity calculation
STEP3-3. Selection of DX-coil unit by supply air temperature
In this step3-3, the outline graph of the average supply air temperature during SA temperature control operation is shown.
Following graph is just an example based on some theoretical conditions.
It might be different from the actual operation.
How to read the graph
A
ir
te
m
pe
ra
tu
re
[˚CD
B
]
Outdoor air temperature[˚CDB] / 50%RH
5
10
15
20
25
30
10 15 20 25 30 35 40
Design OA temperature: 30˚C
The cross point of “Design set point” and
“Design OA temp.” is in the gray area.
→
SA temp. can be “set point ±3˚C ”.
Design set point: 21˚C
5
10
15
20
25
30
10 15 20 25 30 35 40
A
ir
te
m
pe
ra
tu
re
[˚CD
B
]
Outdoor air temperature[˚CDB] / 50%RH
If the cross point of “Design set point” and
“Design OA temp.” is out the gray area,
SA temp. cannot be controlled well due to
“too-low or too-high” cooling capacity.