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6. 1
FUNCTIONING LIMITS
Twc
60
Tc
65
55
60
50
55
45
50
40
45
35
40
30
35
30
25
25
20
-6
-4
-2
6.2
DESIGN DATA
7. 1
COOLING CAPACITY AND
ABSORBED POWER
The cooling capacity produced and the
electrical power absorbed in conditions
different to nominal conditions are
obtained by multipling the nominal values
(Pf, Pa) by the respective corrective
co-efficients (Cf, Ca).
The following diagram allows to
obtain the correct co-efficients to be
used for chillers in cooling mode; in
correspondence of each curve the
temperature of the water exiting the
condenser is stated, to which reference
is made (∆t=5°C is assumed).
KEY:
Cf =
Corrective co-efficiency of the
cooling capacity
Ca =
Corrective co-efficiency of the
absorbed power
NOTE:
FOR ∆T DIFFERENT TO 5°C
At the evaporator Tab.7.3 is used to
obtain the corrective powers of the
cooling capacity and power absorbed.
In order to consider dirtying of the
heat exchangers, relative dirtying
factors are used.
CRITERIA OF CHOICE
6
1
2
0
2
4
6
8
10
Twe
°C
Maximum acceptable pressure
Maximum acceptable temperature
Minimum acceptable temperature
CORRECTIVE CO-EFFICIENTS
7
Ca
Cf
Functioning with glycoled water
1
2
Standard functioning
NOTE
Heat exchanger output temperature
Twe
with (evaporator) functioning
Heat exchanger output temperature
Twc
with (condenser) functioning
Tc
Condensation temperature
The functioning limits diagram is relative
to a ∆t of 5 °C on the evaporator and
on the condenser (for the units with
condenser).
12
14
16
bar
°C
°C
Temperature of the water produced (∆t=5°C)
H i g h p r e s s u r e
Low pressure side
side
28
22
120
52
-10
-16
11
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