THERMAL ENERGY STORAGE SYSTEM

1Stratified Water Storage Tank

This is our most popular type of Thermal Energy Storage System. In a naturally stratified chilled-water storage tank, cold and warm volumes of water are stored together without a physical barrier. A stable density gradient prevents the mixing of the two volumes. The proper design of diffusers is able to maintain the stable and reduced gradient during the complete operation of the tank.

Typically, there will be a 0.4 to 0.6m thick thermocline (a region with vertical temperature and density gradients) making a separation between the cold and the hot water. In discharging mode, cold water is withdrawn from the bottom diffuser and warm water returns to the top of the tank. Regarding the charging mode, cold water is introduced from the bottom diffuser and warm water is withdrawn from the top of the tank.

2Ice Thermal Energy Storage Tank

Ice TES Tank uses the latent heat of fusion of water to store cooling. Thermal energy is stored in ice at the freezing point of water (0 ºC), via a heat transfer fluid at temperatures that range from -9 to -3 ºC.

Depending on the ice thermal storage technology selected, the chillers shall be selected accordingly. The heat transfer fluid for ice-making may be a refrigerant or a secondary anti-freeze coolant, such as glycol. The low storage temperature of ice also provides the ability to produce lower temperature air for cooling.

The main Ice Storage technologies: Ice harvester, internal melt-on-coil, and external melt-on-coil and encapsulated ice.