21
COOLING CAPACITIES — ENGLISH (cont)
LEGEND AND NOTES FOR COOLING CAPACITY TABLES — ENGLISH
LEGEND
NOTES:
1. Ratings are gross, and do not account for the effects of the evaporator-fan
motor power and heat.
2. Direct interpolation is permissible. Do not extrapolate.
3. SHC is based on 80 F db temperature of air entering the unit. At any
other temperature, correct the SHC read from the table of cooling capaci-
ties as follows:
Corrected SHC
Btuh
=SHC+[1.10x(1–BF)x(F
db
–80)xcfm]
Observe the rule of sign. Above 80 F, SHC correction will be positive; add
it to SHC. Below 80 F, SHC correction will be negative; subtract it from
SHC.
4. Formulas:
Leaving wet bulb = wet bulb temperature corresponding to enthalpy of air
leaving coil (h
lwb
).
Where h
ewb
is enthalpy of air entering evaporator coil (kJ/kg).
50TFF012 (8.3 TONS)
Temp (F)
Air Entering
Condenser
(Edb)
Air Entering Evaporator — Cfm/BF
2500/0.093200/0.105 3800/0.12 4000/0.13
Air Entering Evaporator — Ewb (F)
62 6772626772626772626772
75
TC 95.1 108.3 116.7 104.5 112.8 121.4 106.2 114.9 124.4 107.0 115.8 124.2
SHC 77.4 64.2 77.2 87.6 70.1 82.0 101.9 74.6 84.7 95.0 75.9 32.4
kW 7.39 7.69 7.83 7.55 7.74 8.00 7.5 7.81 8.10 7.56 7.84 8.10
85
TC 88.9 102.3 112.0 98.5 108.3 116.9 101.8 110.3 119.2 102.7 110.8 119.0
SHC 79.9 69.3 55.1 93.5 77.7 60.0 100.3 83.4 63.7 102.2 85.1 64.4
kW 7.91 8.24 8.42 8.08 8.34 8.60 8.10 8.39 8.69 8.15 8.41 8.67
95
TC 81.8 94.7 107.2 91.2 102.5 110.9 96.8 104.4 113.7 98.0 105.0 114.2
SHC 76.4 66.2 53.8 89.5 76.0 58.1 96.7 82.1 61.4 98.0 83.9 63.2
kW 8.64 8.94 8.85 8.77 9.08 8.96 8.8 9.15 9.03 8.91 9.17 4.60
105
TC 74.2 86.4 101.8 83.4 95.2 105.3 89.7 98.2 107.6 91.3 98.7 108.0
SHC 72.1 62.8 51.8 83.4 73.4 56.9 89.7 80.5 60.8 91.3 82.6 61.7
kW 9.06 9.42 9.74 9.26 9.56 9.88 9.4 9.65 9.96 9.48 9.66 9.98
115
TC 67.4 77.2 94.2 75.6 83.8 99.0 81.3 87.4 100.6 82.8 88.4 101.0
SHC 67.3 59.1 49.5 75.6 68.9 55.1 81.2 76.3 59.0 82.7 78.7 60.1
kW 9.71 10.04 10.42 9.97 10.19 10.59 10.1 10.28 10.66 10.19 10.31 10.68
125
TC 63.2 69.2 84.4 68.5 71.8 88.8 73.1 75.0 92.3 74.2 76.0 93.0
SHC 63.2 56.0 46.0 68.5 64.3 51.9 73.0 70.9 56.9 74.2 73.0 58.4
kW 10.37 10.68 11.09 10.69 10.85 11.27 10.9 10.95 11.37 10.93 10.97 11.41
50TFF014 (10.2 TONS)
Temp (F)
Air Entering
Condenser
(Edb)
Air Entering Evaporator — Cfm/BF
3150/0.13 4200/0.17 5100/0.21
Air Entering Evaporator — Ewb (F)
62 6772626772626772
75
TC 125.1 137.3 147.5 133.0 143.5 154.1 135.1 145.6 156.1
SHC 107.5 90.6 71.7 125.8 101.9 78.7 134.0 109.7 83.1
kW 9.48 9.60 9.69 9.58 9.67 9.79 9.59 9.69 9.83
85
TC 115.4 129.6 140.9 124.4 135.9 147.3 128.9 138.6 149.9
SHC 103.1 87.7 69.8 120.8 99.8 77.0 128.3 108.6 82.1
kW 10.15 10.33 10.49 10.29 10.43 10.61 10.34 10.48 10.66
95
TC 105.5 122.0 134.4 115.8 128.2 140.4 122.7 131.5 143.6
SHC 98.9 84.8 67.8 115.7 97.8 75.3 122.7 107.6 81.2
kW 10.83 11.06 11.30 11.01 11.20 11.41 11.11 11.27 11.47
105
TC 94.1 112.2 126.9 106.5 118.9 132.4 115.2 122.6 135.8
SHC 92.7 81.2 65.3 106.5 94.8 73.2 115.2 105.6 79.4
kW 11.54 11.83 12.10 11.76 11.98 12.22 11.92 12.06 12.31
115
TC 86.9 100.4 117.9 96.5 105.3 123.7 104.6 109.2 126.2
SHC 86.8 76.4 62.5 96.5 89.8 70.5 104.6 100.4 77.2
kW 12.26 12.55 12.91 12.58 12.74 13.07 12.73 12.83 13.14
125
TC 79.9 88.5 108.8 86.4 91.7 115.0 94.1 96.0 116.5
SHC 79.9 71.7 59.6 86.3 84.8 67.8 99.1 94.6 74.8
kW 13.00 13.29 13.72 13.40 13.49 13.91 13.55 13.62 13.96
BF — Bypass Factor
Edb — Entering Dry Bulb Temperature (F)
Ewb — Entering Wet Bulb Temperature (F)
kW — Compressor Motor Power Input
SHC — Sensible Heat Capacity (1000 Btuh)
TC — Total Capacity (1000 Btuh)
F
ldb
=F
edb
–
SHC
Btuh
1.09 x cfm
h
lwb
=h
ewb
–
TC
Btuh
4.50 x cfm
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