19
PERFORMANCE DATA (CONT)
*At75°F(24°C) entering dry bulb---Tennessee Valley Authority (TVA) rating conditions; all others at 80°Fdrybulb.
LEGEND
BF— Bypass Factor
edb— Entering Dry ---Bulb
Ewb— Entering Wet---Bulb
kW — Total Unit Power Input
SHC— S ensible Heat Capacity (1000 Btuh)
TC — Total C a pacity (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 entering evaporator coil
4. The SHC 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 (e db + 80).
5. Integrated capacity is maximum (instantaneous) capacity less the effect
of fr ost on the outdoor coil and th e heat r equired to defrost it.
577C-- --A
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