System Operation

Basic System Operation
Full Storage or Partial Storage
The following is only one possible arrangement of system components to illustrate basic concepts. These diagrams include single atmospheric storage tanks. As shown in project photos, nearly any tank arrangement is possible.
Cryogel Ice Balls

Cryogel Ice Balls are 4 inch (103mm) diameter spheres constructed of high performance polyethylene and filled with water to form ice for cool energy storage.   Ice Balls are placed in storage tanks and are charged (frozen) and discharged (melted) by means of circulating a glycol based heat transfer fluid around the balls.

Ice Ball Dimples Allow for Expansion

As water inside the Ice Ball freezes to form ice, the 16 preformed dimples flex out to allow for expansion. Without the dimples, the life of the balls would be diminished due to stretching and stressing of the plastic walls. Patents in the U.S. and other countries protect Cryogel technology.

Charge – Ice Building

During the charge mode (usually during off-peak hours at night), glycol is circulated around the Ice Balls in a storage tank and then out to a chiller where it is cooled to temperatures low enough to make ice.

Discharge – Ice Melting

During the discharge mode, the same glycol solution is circulated around the Ice Balls in the storage tank. Ice Balls cool the glycol solution that is then pumped to the load to provide air conditioning or process cooling.


During the standby Mode, the chillers may be used to cool the building directly without using ice. During this time, ice storage may be conserved for later periods of high demand or periods of high electrical rates.

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