Our dynamic ice storage system -"The Jiyu Sekkei " -utilizes the more cost-effective nocturnal electricity tariff to manufacture sherbet-like ice to stock up a storage tank during the night. Use of this ice for air conditioning and cooling during the day can cut back on energy costs.

Ice Storage Tank

"Trans-pet" closed system icemaker

Ice Storage Tank

Supercooling Heat Excahnger

This system is made up of a chiller, a "Trans-pet" closed system ice-maker, a supercooling heat exchanger, an ice storage tank and some pumps. The water in the storage tank is pumped into the heat exchanger and super-cooled to - 2 degree C by brine supplied from the chiller. The supercooled water flows into the Trans-pet. A two-phase fluid mixture of water and ice (ice-slurry) is produced in the Trans-pet as the phase changes from supercooled water to ice. The ice-slurry is then stored in the ice storage tank. All these operations take place in a closed system without exposure to the atmosphere. Therefore, the ice slurry produced by the Trans-pet can easily be transported to the storage tank wherever the tank is installed. Moreover this system can enhance the coefficient of performance (COP) of the chiller at ice-making through the use of a plate-type heat exchanger as the supercooling heat exchanger that has a high heat-transfer performance. The supercooling heat exchanger and the ice-making device have a maximum ice-making capacity of 1,800 kW. Therefore, this system can be used as a heat source for district heating and cooling plants.

Ice storage system "The Jiyu-Sekkei"

When supercooled water flows into the Trans-pet, the ice-nuclei generator is activated and ice slurry is produced. The ice- packing factor (IPF) of ice produced from supercooled water of - 2 degree C is only 2.5% by weight. The pressure loss of ice-slurry piping is the same as that of ice-excluding chilled-water piping.

Ice-making state in "Trans-pet" -the closed ice-maker