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Flooded type water cooled screw chiller (MIC)
MCAC-CTSM-2018-1
24
System minimum water volume
A set water volume is necessary for stable operation. It is often necessary to add a buffer water tank to
the circuit to achieve the required volume. The tank must be internally baffled to ensure the liquid (water
or brine ) is properly mixed. Water tank volume is larger than the whole system water volume at least
10%.
Refer to the examples below.
How to calculate minimum volume in pipeline system:
W=QgT/CP
▽
t
W
— Minimum water volume
(
kg
);
Qg
— Total cooling/heating capacity of the terminal
(
kW
);
T
— Thermal stability time requirement
,
Take
(
8
~
10
)
×60s
;
CP
— Water specific heat at constant pressure
,
4.187kj/
(
kg·
℃
);
▽
t
— Water temperature fluctuation required value
,
take 5
℃
.
For system, Qg is calculated according to the lowest load so that it operates stably.
It can be also calculated according to 0.5Q(50%). T takes 8 minutes, the shortest time that the unit run
for..
That is 480 s. Cp=4.18kj/kg,
▽
t =5
℃
According to the above formula, the result is as follows:
W=0.5Q*480/
(
4.18*5
)
=11.48Qkg
Note:
The above formula is only for reference. Different dimensions can be adopted to suit for different
condition.