ICE CHILLER® from Baltimore Air Coil
Internal Melt
BAC's modular ICE CHILLER® Thermal Storage Unit can operate in any of five distinct operating modes. These modes of operation provide the flexibility required by building operators to meet their daily HVAC cooling requirements.
The HVAC control is programmed to energize the applicable mode of operation based on a time schedule matching electrical use of facility and utility rate schedule.
ICE BUILD - In this operating mode, ice is built by circulating a 25% solution (by weight) of inhibited ethylene/propylene glycol through the coils contained in the ICE CHILLER® Thermal Storage Unit. For a typical 10-hour build time, the supply glycol temperature is never lower than 22°F(-5.5°C). For build times less than 10 hours, the minimum glycol temperature will be lower than 22°F (-5.5°C) at the end of the build cycle.
ICE BUILD WITH COOLING - When cooling loads exist during the ice build period, some of the cold glycol used to build ice is diverted to the cooling load to provide the required cooling. The amount of glycol diverted is determined by the building loop set point temperature. BAC recommends that this mode of operation be applied on systems using primary/secondary pumping. This reduces the possibility of damaging the cooling coil or heat exchanger by pumping cold glycol, lower than 32°F (1°C), to this equipment.
COOLING - ICE ONLY - In this operating mode, the chiller is off. The warm return glycol solution is cooled to the desired set point temperature by melting ice stored in the modular ICE CHILLER® Thermal Storage Unit.
COOLING - CHILLER ONLY - In this operating mode, the chiller supplies all the building cooling requirements. Glycol flow is diverted around the thermal storage equipment to allow the cold supply glycol to flow directly to the cooling load. Temperature set points are maintained by the chiller.
COOLING - ICE WITH CHILLER - In this operating mode, cooling is provided by the combined operation of the chiller and thermal storage equipment. The glycol chiller pre-cools the warm return glycol. The partially cooled glycol solution passes through the ICE CHILLER® Thermal Storage Unit where it is cooled by the ice to the design temperature.
Modular Tanks The rectangular design of BAC's Modular ICE CHILLER® Thermal Storage Unit maximizes the ton-hours per ft2 of available plan area. The 7'-10" (2.4 m) wide units are designed so that they can be installed through interior double-door openings. Units are designed to be installed either indoors or outdoors.
Modular Coils
BAC ICE CHILLER® Thermal Storage Coils can go in a variety of customer-supplied tanks. Concrete, steel, rectangular, round, triangular, above ground, or below ground, we have put coils into it.
ICE CHILLER® Thermal Storage Coils are constructed of continuous 1.05 in (26.7 mm) O.D. all prime surface serpentine steel tubing, with no intermediate butt welds. The coils are assembled in a structural steel frame designed to support the weight of the coil stack with a full ice build. After fabrication, the coils are tested for leaks using 375 psig (2,600 kPa) air pressure under water for a minimum of fifteen (15) minutes, then hot-dip galvanized for corrosion protection.
Individual coils are factory-assembled into modules of two (2) coils. Necessary support steel and lifting lugs are provided on the modules to allow for lifting into and final positioning within the storage tank.
BAC can provide in-depth knowledge on the design and operation of for ice on your air-conditioning, process cooling or district cooling systems. With thousands of successful installations worldwide, BAC is a global leader in the application of ice thermal storage.
