Flooded type water cooled screw chiller (MIC) MCAC-CTSM-2018-1
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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.
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