For both method [A] and [B], the return water temperature for the multiple chillers will not be the
same due to mixing. This will cause inefficiencies and energy wastages to the chiller operation.
3) Common Tank System
This method is for an open system.
CHILLERS
to load
Tank
return from load
As seen from the diagram, each chiller and secondary pump forms its own individual pipe
circuit. There is no cross flow among each of them. This has been achieved with the
common tank which acts as a buffer storage tank.
Therefore, there is no need of check valves. Normal globe valves will suffice to ensure
proper water flow through each chiller.
Usually, the tank is at a higher elevated position, to allow gravity feed of water to the chillers
and pumps.
This method is most expansive to install due to the additional piping and tank required for
the system.
Please refer to Page 14 for cautions during installation and operation.
Section 2 Page 20
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