18
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.
50TFQ008 (7
1
/
2
TONS)
Temp (F)
Outdoor
Entering Air
(Edb)
Indoor Entering Air — Cfm/BF
2250/0.04
3000/0.06
3200/0.08
3750/0.11
Indoor Entering Air — Ewb (F)
72
67
62
72
67
62
72
67
62
72
67
62
75
TC
109.8
101.4
92.2
116.2
107.0
98.0
117.6
108.8
100.2
118.8
110.4
102.4
SHC
44.2
57.4
69.4
49.6
66.0
82.0
51.8
69.8
87.0
54.0
74.0
92.0
kW
6.66
6.44
6.18
6.86
6.60
6.36
6.92
6.66
6.42
6.94
6.70
6.48
85
TC
105.2
96.4
87.0
111.4
102.2
92.6
113.0
104.0
95.0
114.6
105.8
97.6
SHC
42.8
55.6
67.6
48.4
65.0
80.0
50.8
69.0
84.4
53.4
73.8
88.8
kW
7.20
6.94
6.64
7.42
7.14
6.82
7.48
7.20
6.90
7.54
7.28
7.00
95
TC
100.6
91.0
82.0
105.6
96.2
87.4
107.2
98.0
89.8
108.6
99.6
92.8
SHC
41.6
54.0
65.8
47.0
63.2
77.8
49.4
67.4
81.4
52.0
72.2
84.6
kW
7.78
7.42
7.08
7.96
7.62
7.30
8.00
7.70
7.40
8.06
7.76
7.50
105
TC
94.8
85.4
76.8
99.8
90.2
82.2
101.4
91.6
85.0
103.2
93.2
88.0
SHC
40.0
52.2
63.8
45.6
61.6
74.6
48.2
65.8
77.6
51.2
70.4
80.4
kW
8.26
7.88
7.50
8.48
8.10
7.76
8.56
8.18
7.88
8.64
8.24
8.02
115
TC
88.8
79.9
71.4
93.4
84.0
77.6
94.8
85.4
80.0
96.0
86.6
83.0
SHC
38.4
50.4
61.6
44.2
59.8
70.6
46.6
64.0
73.2
49.4
68.6
75.8
kW
8.76
8.32
7.90
8.98
8.54
8.22
9.04
8.62
8.36
9.10
8.70
8.50
125
TC
82.6
73.8
65.8
86.6
77.4
74.4
88.0
78.8
75.0
89.2
80.0
77.6
SHC
36.8
48.6
59.2
42.2
57.8
66.2
45.2
62.0
68.6
48.2
66.6
71.0
kW
9.20
8.74
8.30
9.44
8.96
8.68
9.52
9.02
8.82
9.60
9.12
8.98
50TFQ009 (8
1
/
2
TONS)
Temp (F)
Outdoor
Entering Air
(Edb)
Indoor Entering Air — Cfm/BF
2400/0.06
3200/0.09
3600/0.11
4000/0.14
Indoor Entering Air — Ewb (F)
72
67
62
72
67
62
72
67
62
72
67
62
75
TC
111.4
102.3
91.0
115.7
108.2
97.6
117.0
110.1
100.4
118.1
111.6
102.5
SHC
51.8
64.3
75.3
54.9
71.9
87.6
55.8
74.9
92.5
56.7
77.1
96.4
kW
8.64
8.48
8.23
9.32
9.18
8.95
9.73
9.61
9.30
10.19
10.12
9.72
85
TC
108.8
97.4
86.1
113.7
104.2
92.9
115.2
106.6
94.8
116.6
108.3
98.0
SHC
50.9
62.3
73.2
54.7
70.9
85.1
55.7
74.3
89.3
56.7
77.2
92.2
kW
9.27
9.09
8.76
9.98
9.79
9.40
10.40
10.24
9.83
10.88
10.74
10.20
95
TC
104.5
92.7
81.2
110.4
98.8
87.7
112.0
101.3
90.8
113.2
103.1
93.8
SHC
49.3
60.2
70.9
53.7
68.7
82.4
55.1
72.6
86.3
56.2
75.7
88.2
kW
9.90
9.56
9.22
10.64
10.39
9.88
11.07
10.86
10.25
11.55
11.36
10.67
105
TC
98.8
87.8
75.9
105.5
93.4
83.0
107.4
95.4
86.5
108.9
97.1
89.5
SHC
47.1
58.3
68.1
52.2
66.5
79.0
53.7
69.9
82.2
55.1
72.9
83.9
kW
10.37
10.08
9.70
11.26
10.90
10.33
11.71
11.34
10.73
12.20
11.82
11.24
115
TC
93.8
82.4
71.1
98.7
87.9
78.6
100.8
89.8
82.1
102.9
91.3
85.3
SHC
45.3
56.0
65.9
49.5
64.5
75.5
51.3
68.0
77.9
53.0
71.0
79.6
kW
10.99
10.56
10.13
11.72
11.39
10.79
12.16
11.86
11.24
12.76
12.38
11.76
125
TC
88.4
77.2
66.7
93.1
82.2
74.5
94.9
83.9
77.9
96.2
85.3
80.8
SHC
43.4
54.1
63.1
47.7
62.3
71.4
49.2
65.8
73.7
50.4
68.8
75.2
kW
11.52
11.03
10.56
12.33
11.87
11.30
12.78
12.33
11.75
13.29
12.81
12.27
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
Performance data (cont)
