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78 TRG-TRC016-EN
notes
period three
System Variations
Application Outside the Operating Range of the Chiller
Some process-load applications involve either temperatures or flow rates that
are outside the capabilities of any chiller. This may include high return-water
temperatures, high or low fluid flow rates, or high or low system ∆Ts. By using
special piping arrangements, a standard chiller can still be used to satisfy the
requirements of the process load.
Figure 86 shows a system in which the water flow requirement of the process
load is below the minimum flow rate for a chiller with the required capacity.
The system is designed like a primary-secondary system, but the production
loop has a higher design flow rate than the distribution loop. This allows the
water flow rate and ∆T through the chiller to be within the acceptable limits,
while the water flow rate and ∆T through the process meet its requirements.
Alternatively, in a smaller system with a single chiller, a single pump on the
chiller side of the bypass and a diverting valve to maintain the proper flow
through the process load can achieve the same result.
Application Outside Range of Chiller
air
air
-
-
cooled
cooled
chiller
chiller
240
240
gpm
gpm
at 45°F
at 45°F
[15 L/s at 7.2°C]
[15 L/s at 7.2°C]
80
80
gpm
gpm
at 45°F
at 45°F
[5 L/s at 7.2°C]
[5 L/s at 7.2°C]
1
6
0
1
6
0
g
p
m
g
p
m
a
t
4
5
°
F
a
t
4
5
°
F
[
1
0
L
/
s
a
t
7
.
2
°
C
]
[
1
0
L
/
s
a
t
7
.
2
°
C
]
process load
process load
240
240
gpm
gpm
at 56.7°F
at 56.7°F
[15 L/s at 13.7°C]
[15 L/s at 13.7°C]
80
80
gpm
gpm
at 80°F
at 80°F
[5 L/s at 26.7°C]
[5 L/s at 26.7°C]
Figure 86