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13RLC-PRC006-EN
The chiller capacity tables cover the
most frequently encountered leaving
liquid temperatures. The tables reflect a
10°F/5.6°C temperature drop through the
evaporator. For other temperature drops,
apply the appropriate Performance Data
Adjustment Factors from Table A-1. For
chilled brine selections, contact your
local Trane sales engineer. To select a
Trane air-cooled Series R
™
chiller, the
following information is required:
1
Design load in tons of refrigeration
2
Design chilled water temperature drop
3
Design leaving chilled water temperature
4
Design ambient temperature
Evaporator flow rates can be determined
by using the following formulas:
GPM = (Tons x 24) / Temperature Drop
(Degrees F)
OR
L/S = (kW (Capacity) x .239) /
Temperature Drop (Degrees C)
NOTE: Flow rates must fall within the
limits specified in Tables G-1 and G-2 (for
GPM or for l/s).
Selection
Procedure
Selection Example
Given:
Required System Load = 140 Tons
Leaving Chilled Water Temperature
(LCWT) = 44°F Chilled Water
Temperature Drop = 10°F Design
Ambient Temperature = 95°F
Evaporator Fouling Factor = 0.0001
1
To calculate the required chilled water
flow rate we use the formula given
below:
GPM = (140 Tons x 24) / 10°F = 336 GPM
2
From Table P-1 (RTAC performance
data), an RTAC 140 standard at the given
conditions will produce 140.8 tons with
compressor power input of 158.5 kW
and a unit EER of 9.7.
3
To determine the evaporator pressure
drop use the flow rate (GPM) and
pressure drop chart on page 16. Entering
the curve at 336 gpm, the pressure drop
for a nominal 140 standard evaporator is
16 feet.
Minimum Leaving Chilled Water
Temperature Setpoint
The minimum leaving chilled water
temperature setpoint for water is 40°F.
For those applications requiring lower
setpoints, a glycol solution must be
used. Contact the local Trane sales
engineer for additional information.