Water Chillers and Ice Banks

Chilling is critical to many businesses whether for staff comfort, temperature control or process cooling. Our range of industrial and commercial chiller solutions have been developed to deliver reliable and low life cycle cost cooling.

DC-System analyzes the clients need for chilling, and based on the load profile, the capacity of existing equipment, if any, the need for future expansion and the cost of electrical power, we suggest the most economical solution.

Water chillers are widely used in large commercial buildings as they require a substantial amount of cooling and because the chillers are cost effective and there is a reduced hazard by not having refrigerant piped all over the building. Fundamentally, the function of the chilled water system is to transport the chilled water from the chiller to the load terminals and back to the chiller to maintain space comfort.

Water chiller types include reciprocating, centrifugal, screw and absorption chillers. Reciprocating water chillers use piston-type, positive displacement compressors found in small and medium capacity systems. Centrifugal chillers are the most commonly used in commercial water chillers, and they are found in medium and large capacity systems. Absorption chillers, found in large capacity systems, use water as a refrigerant and steam to cause a water and lithium bromide solution to separate.

Ice Bank technology is a form of thermal energy storage. The principal application is the production of ice, chilled water, or eutectic solution at off-peak hours – typically at night – which is then used to cool environments during the day.

High peak summertime loads drive the capital expenditures of the electricity generation industry. A kilowatt-hour of electricity consumed at night is produced at a much lower marginal cost and utilities have begun to pass these lower costs to consumers by way of Real Time Pricing Rates, making thermal energy storage with ice banks a good investment.

The most widely used form of ice bank technology is in large buildings or campus-wide air conditioning and chilled water systems. Air conditioning systems, especially in commercial buildings, are the most significant contributors to the peak of electrical loads seen on hot summer days. In this application, a relatively standard chiller is run at night to produce a pile of ice. Water is then circulated through the pile during the day to produce chilled water that would normally be the daytime output of the chillers.