23
LEGEND NOTES:
1. Direct interpolation is permissible. Do not extrapolate.
2. The following formulas may be used:
COOLING CAPACITIES (1 STAGE-COOLING) 3 TONS (cont)
582J*04G (3 TONS) - UNIT WITH PERFECT HUMIDITY SYSTEM IN HOT GAS REHEAT MODE
TEMP (F) AIR ENT
CONDENSER (Edb)
AIR ENTERING EVAPORATOR - Ewb (F)
75 Dry Bulb
62.5 Wet Bulb
(50%Relative)
75 Dry Bulb
64 Wet Bulb
(56% Relative)
75 Dry Bulb
65.3 Wet Bulb
(60% Relative)
Air Entering Evaporator - cfm
900 1200 1500 900 1200 1500 900 1200 1500
80
TC 12.26 13.13 13.65 13.53 14.48 15.00 14.73 15.63 16.20
SHC 1.76 3.87 6.09 0.75 2.48 4.33 -0.06 1.30 2.81
kW 1.92 1.93 1.94 1.96 1.98 2.00 2.00 2.01 2.02
75
TC 14.64 15.64 16.30 15.84 16.73 17.32 16.80 17.38 17.91
SHC 3.87 6.09 8.38 2.88 4.59 6.29 2.03 3.14 4.39
kW 1.87 1.88 1.88 1.89 1.90 1.91 1.91 1.92 1.93
70
TC 16.72 17.62 18.01 17.42 18.17 18.62 18.02 18.69 18.87
SHC 5.89 7.85 9.40 4.65 6.08 7.35 3.71 5.09 5.59
kW 1.78 1.80 1.82 1.81 1.83 1.84 1.82 1.82 1.86
60
TC 17.43 18.50 18.28 18.09 19.03 19.41 18.32 18.29 19.33
SHC 7.75 10.06 9.51 7.08 8.34 9.60 6.29 6.94 7.88
kW 1.66 1.62 1.70 1.67 1.69 1.68 1.69 1.70 1.71
50
TC 17.82 18.59 19.72 18.31 19.73 20.26 18.76 20.21 20.73
SHC 6.40 7.99 10.05 4.79 6.71 7.97 3.40 5.11 6.16
kW 1.98 2.03 1.94 2.01 1.94 1.97 2.03 1.96 1.99
40
TC 17.70 19.38 19.85 19.10 20.30 20.34 19.53 20.76 21.26
SHC 6.30 8.74 10.17 5.54 7.26 8.05 4.13 5.64 6.67
kW 2.07 1.95 1.99 1.93 1.91 2.02 1.96 1.94 1.97
Edb — Entering dry-bulb
Ewb — Entering wet-bulb
kW — Compressor motor power input
Ldb — Leaving dry-bulb
Lwb — Leaving wet-bulb
SHC — Sensible capacity (1000 Btuh) gross
TC — Total capacity (1000 Btuh) gross
t
ldb
= Wet-bulb temperature corresponding to enthalpy of air leaving evapora-
tor coil (h
lwb
)
Where h
ewb
= Enthalpy of air entering evaporator coil
t
ldb
=t
edb
– sensible capacity (Btuh)
1.10 x cfm
h
lwb
=h
ewb
– total capacity (Btuh)
4.5 x cfm
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