Net Cooling Capacities - Bryant 588A Manual

588A060 (5 TONS)
Indoor
Coil Air
Capacity
Ewb
(Btuh x 1000)
Cfm BF
(F)
Total
72 69.4
1750 0.03 67 62.0
62 55.0
72 70.5
2000 0.04 67 63.1
62 56.3
72 71.3
2250 0.05 67 63.9
62 58.2
LEGEND
BF — Bypass Factor
Edb — Entering Dry-Bulb
Ewb — Entering Wet-Bulb
Ldb — Leaving Dry-Bulb
Lwb — Leaving Wet-Bulb
SHC — Sensible Heat Capacity (1000 Btuh)
NOTES:
1. Ratings are net; they account for the effects of the indoor-fan motor
power and heat.
2. Direct interpolation is permissible. Do not extrapolate.
3. The following formulas may be used:
sensible capacity (Btuh x 1000)
t = t –
ldb edb
1.10 x cfm
NET COOLING CAPACITIES (cont)
Outdoor Coil Entering-Air Temperature (F)
85
Capacity
Total
(Btuh x 1000)
System
kW
Sensible Total
34.2 6.53 66.2
43.7 6.33 58.8
52.4 6.14 51.8
35.8 6.70 67.3
46.7 6.50 59.5
56.1 6.32 53.6
37.4 6.88 68.1
49.5 6.67 60.2
58.1 6.52 55.6
95
Capacity
Total
(Btuh x 1000)
System
kW
Sensible Total
33.2 7.05 62.9
42.4 6.82 55.1
51.0 6.62 48.7
34.8 7.22 63.9
45.3 7.00 56.0
53.5 6.83 51.0
36.3 7.39 64.5
48.2 7.17 56.7
55.6 7.03 53.0
t = Wet-bulb temperature corresponding to enthalpy of air
lwb
leaving indoor coil (h
h = h –
lwb ewb
Where: h
ewb
4. 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.
Correction Factor = 1.10 x (1 – BF) x (edb – 80).
16
105
Capacity
Total
(Btuh x 1000)
System
kW
Sensible Total
32.1 7.60 59.5
41.1 7.37 52.0
48.7 7.17 45.8
33.7 7.78 60.5
44.0 7.54 52.8
50.9 7.39 48.5
35.3 7.95 60.8
46.9 7.71 53.4
52.8 7.59 50.4
)
lwb
total capacity (Btuh x 1000)
4.5 x cfm
= Enthalpy of air entering indoor coil
115
Total
System
kW
Sensible
30.9 8.19
40.0 7.94
45.8 7.77
32.6 8.36
42.8 8.12
48.4 7.98
34.1 8.53
45.6 8.29
50.3 8.18