7
3-5. FRESH AIR INTAKE AMOUNT & STATIC PRESSURE CHARACTERISTICS
Q
0
B
A
C
1
Curve in the
graphs
Duct characteristics
at site
Q
A
EC
2
Q
Qa
AD
3
Q…Designed amount of fresh air intake
<CMM(CFM)>
A…Static pressure loss of fresh air
intake duct system with airflow
amount Q
<Pa(in.W.G.x10
-2
)>
B…Forced static pressure at air con-
ditioner inlet with airflow amount Q
<Pa(in.W.G.x10
-2
)>
C…Static pressure of booster fan with
airflow amount Q <Pa(in.W.G.x10
-2
)>
D…Static pressure loss increase amount
of fresh air intake duct system for
airflow amount Q <Pa(in.W.G.x10
-2
)>
E…Static pressure of indoor unit with
airflow amount Q <Pa(in.W.G.x10
-2
)>
Qa…Estimated amount of fresh air
intake without D
<CMM(CFM)>
How to read curves
PCFY-P15NKMU-E.TH
PCFY-P15NKMU-ER1.TH
PCFY-P24NKMU-E.TH
PCFY-P24NKMU-ER1.TH
■
■
PCFY-P30, 36NKMU-E.TH
PCFY-P30, 36NKMU-ER1.TH
■
50(20)
0
-50(-20)
-100(-40)
-150(-60)
-200(-80)
-250(-100)
-300(-120)
Static pressure[Pa(in.W.G.×10
ˉ
²]
Airflow rate
0 1 2 3 4
[CMM]
[CFM]
50
100
50(20)
0
-50(-20)
-100(-40)
-150(-60)
-200(-80)
-250(-100)
-300(-120)
Static pressure[Pa(in.W.G.×10
ˉ
²]
Airflow rate
0 1 2 3 4
[CMM]
[CFM]
50
100
50(20)
0
-50(-20)
-100(-40)
-150(-60)
-200(-80)
-250(-100)
-300(-120)
Static pressure[Pa(in.W.G.×10
ˉ
²]
Airflow rate
0 1 2 3 4
[CMM]
[CFM]
50
100
OCH500A
