19
PERFORMANCE DATA
*At75°F(24°C) entering dry bulb---Tennessee Valley Authority (TVA) rating condition s; all others at 80°F(27°C) dry bulb.
LEGEND
BF— Bypass Factor
edb— Entering Dry ---Bulb
Ewb— Entering Wet---Bulb
kW — Total Unit Power Input
SHC— Sensible Heat Capacity (1000 Btuh)
TC — Total Capacity ( 1000 Btuh) (net)
rh—Relative Humidity
COOLING NOTES:
1. Ratings are net; they account for the effects of the evaporator---fan motor power and heat.
2. Direct interpolation is permissible. Do not extrapolate.
3. The following formulas may be used:
Sensible capacity
(Btuh)
1.10 x cfm
t
ldb =
t
edb
---
Wet---bulb temperature corresponding to enthalpy
air l eaving evaporator coil (
h
lwb)
t
lwb =
total capacity (Btuh)
4.5 x cfm
h
lwb =
h
e w b ---
Where:
h
ewb = Enthalpy of air en tering evaporator coil
4. T he S HC is based on 80_F (26.6_C) edb temperature of air entering
evaporator coil. Below 80_F (26.6_C) edb, subtract (corr factor x cfm) from
SHC.
Above 80_F (26.6_ C) edb, add (corr factor x cfm) to SHC.
Correction Factor = 1.10 x (1 + BF) x (edb --- 80).
5. Integrated capacity is maximum (instantaneous) capacity less the effect
of f r ost on the outdoor coil an d the h eat required to defrost it.
574D-- -- A
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