19
COOLING CAPACITIES (cont)
LEGEND
NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
t
lwb
= Wet-bulb temperature corresponding to enthalpy of air leav-
ing indoor coil (h
lwb
)
Where: h
ewb
= Enthalpy of air entering evaporator coil
3. The SHC is based on 80 F edb temperature of air entering indoor
coil.
Below 80 F edb, subtract (corr factor x cfm) from SHC.
Above 80 F edb, add (corr factor x cfm) to SHC.
50TFQ012 (10 TONS)
Temp (F)
Outdoor
Entering Air
(Edb)
Indoor Entering Air — Cfm/BF
2800/0.11
3750/0.16
4100/0.18
4700/0.21
Indoor Entering Air — Ewb (F)
72
67
62
72
67
62
72
67
62
72
67
62
75
TC
127.4
120.4
110.6
134.2
126.2
116.2
135.6
127.4
117.8
137.0
129.0
120.6
SHC
60.0
76.4
91.0
66.2
86.0
104.4
67.8
89.0
108.8
70.2
93.4
115.6
kW
8.30
8.18
7.88
8.54
8.34
8.04
8.60
8.36
8.10
8.64
8.38
8.20
85
TC
124.6
116.2
106.4
131.0
122.0
112.4
132.4
123.6
114.0
133.8
126.0
116.4
SHC
59.2
74.6
89.4
65.4
84.8
103.6
67.4
88.4
107.4
70.0
94.2
112.8
kW
9.24
9.04
8.74
9.50
9.24
8.98
9.54
9.28
9.02
9.60
9.36
9.08
95
TC
121.8
112.0
102.2
126.2
117.4
107.4
127.8
119.0
109.4
130.0
121.2
112.6
SHC
58.4
73.2
87.4
63.8
83.4
101.0
66.0
87.2
104.8
69.6
93.4
110.2
kW
10.34
10.04
9.66
10.46
10.18
9.90
10.52
10.26
9.96
10.62
10.36
10.08
105
TC
116.9
107.2
97.6
122.4
112.4
102.8
123.6
113.8
105.0
124.6
115.6
108.4
SHC
56.6
71.4
85.4
63.0
82.0
98.4
65.0
85.8
101.8
67.8
91.4
106.2
kW
11.38
11.08
10.66
11.64
11.28
10.90
11.68
11.32
11.00
11.68
11.38
11.16
115
TC
112.0
102.0
92.8
116.6
107.0
98.0
118.0
108.2
100.2
120.0
110.0
103.8
SHC
55.0
69.6
83.2
61.2
80.2
95.2
63.6
84.2
98.0
67.4
90.2
101.8
kW
12.58
12.18
11.74
12.78
11.42
12.00
12.84
12.48
12.12
12.96
12.56
12.30
125
TC
106.4
96.8
87.8
110.4
101.2
93.6
111.6
102.2
95.8
113.6
103.8
99.0
SHC
53.2
67.4
80.8
59.2
78.4
91.4
61.4
82.2
94.0
65.4
88.0
97.2
kW
13.84
13.36
12.90
13.96
13.62
13.22
14.02
13.68
13.34
14.14
13.76
13.54
BF
—
Bypass Factor
Edb —
Entering Dry-Bulb
Ewb —
Entering Wet-Bulb
kW
—
Compressor Motor Power Input
Ldb —
Leaving Dry-Bulb
Lwb —
Leaving Wet-Bulb
SHC —
Sensible Heat Capacity (1000 Btuh) Gross
TC
—
Total Capacity (1000 Btuh) Gross
t
ldb
= t
edb
–
sensible capacity (Btuh)
1.10 x cfm
h
lwb
= h
ewb
–
total capacity (Btuh)
4.5 x cfm
