CALMAC® Ice Bank® Energy Storage Tank Model C

The second-generation Model C Thermal Energy Storage tank also features a 100 percent welded polyethylene heat exchanger and improved reliability, virtually eliminating maintenance. The tank is available with pressure ratings up to 125 psi.

There are any number of control strategies that can be utilized to take advantage of the benefits of thermal energy storage. However, there are two basic approaches that define the common limits of system design. Electric rates and building usage will determine which control strategies are best for the project.

• Full Storage A chiller sized large enough to charge enough energy storage can shift the entire load to off-peak periods.
• Partial Storage The chiller works in conjunction with the CALMAC energy storage tanks during on-peak periods to manage the building’s cooling load. During off-peak hours, the chiller charges the tanks for use during the next day’s on peak cooling period.

A secondary fluid is needed that can operate and flow at temperatures low enough to freeze water. An ethylene-based or propylene-based glycol solutions is recommended. A premixed solution of an industrial heat transfer solution that is specially formulated for low viscosity and superior heat-transfer properties should be used. Industrial based HTF’s contain a multi-component corrosion-inhibitor system that can be maintained and provide a long useful life.

You can maintain your CALMAC tanks and the energy storage system by using a maintenance process similar to that used for conventional cooling.

• Perform chiller maintenance as required.
  
• Ensure the controls are operating properly and in sync with the utility rates.
  
• Check the health of the glycol fluid annually.
  
• Check the water level in the tanks.
  
• Add biocide as needed to eliminate algae growth.