Overview

Ice energy storage systems have been in existence for many years. Although many early applications involved systems installed in dairies, churches, and theatres, most current applications are used for continuous comfort cooling. The purpose of a ice energy storage system is to create thermal energy and store it for use at another time.

There are several types of ice energy storage systems in use today. These systems can be either the full or partial storage type. In the typical full ice storage system, the refrigeration system (chillers) generates ice at night when electrical utility rates are typically lowest (off-peak). During the day, when utility rates are higher (on-peak), the ice is then melted to provide cooling to the building. In the partial thermal storage system, a reduced size chiller or refrigeration system operates in conjunction with the ice storage to meet the peak loads. There are several types of partial ice storage systems whose application is dependent on building loads, system equipment and energy costs. However, many partial ice storage systems are used to “shave off” peak energy demands to reduce operating costs.

eVAST, with Fluematic Engineering Pte Ltd, designs and builds ice storage systems with field constructed ice tanks. The purpose of the system is to build ice on the tubes of the coil (thermal energy) at night when utility rates are cheaper and save this stored energy for later cooling use during the day when utility rates are higher. Ice storage systems save (as much as 50% of) operating and installed costs while providing improved system efficiency and reliability. These systems can be used in a variety of applications such as hospitals, hotels, sports arenas, office buildings and district cooling projects.

Link: Electrical Tariff

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