chilled water storage
chilled water storage
(OP)
Has anyone installed a chilled water storage tank (not ice storage) for the purposes of having enough chilled water to keep a server room active in case of chiller shut down? If so, how did you deal with the problem of mixing the stored chilled water with the new warmer water? Does anyone know of any companies (USA) that produce chilled water storage tanks that will serve my purpose?
Thanks in advance
Thanks in advance





RE: chilled water storage
The return water to the tank was through a grid of nozzles above the normal fill line. This prevented the return from simply plunging to the bottom of the tank, and mixing up the water. The suction for the chilled water pump was similarly distributed. The key was to keep the water stratified in themal layers, as much as possible. It worked well.
RE: chilled water storage
RE: chilled water storage
RE: chilled water storage
Thermal storage systems may be a better option than this system.
If your load is not much, you can plan for a standby DX system.
RE: chilled water storage
The other option would be to install dual cooling coils in the AHU - one, a chilled water coil and second one, a DX coil with a matching DX condensing unit.
During power shut downs or when the large chiller is down, the DX unit can be run on DG set.
HVAC68
RE: chilled water storage
A circular shape is advisable as it has lesser surface area than a rectangular tank
Check out the following link to understand more about pipe diffuser design:
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ASHRAE also has published a good paper on chilled water storage system design
RE: chilled water storage
Around here, they tended to be welded steel with insulation. Whether they are worthwhile depends partly on the application- the cost per gallon goes up as the size decreases.
RE: chilled water storage
RE: chilled water storage
RE: chilled water storage
RE: chilled water storage
RE: chilled water storage
I just looked up an old campus job, we had two RC tanks at over 1MM gallons each for 25,000 RThrs.