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Ice Thermal Storage

What is Ice Storage?
Ice Storage is the process of using a chiller or refrigeration plant to build ice during off-peak hours to serve part or the entire on-peak cooling requirement.

Advantages of Ice Thermal Storage

  • Reduced equipment costs
  • Reduced energy and operating costs
  • Colder supply water temperature

Advantages of Ice Thermal Storage

• Reduced equipment costs

  • Only 60% of chillers and heat rejection equipment required
  • Requires only 1/4 to 1/6 of the space required for chilled water storage (3Ft3 /Ton-Hour)
  • Requires less chiller plant plan area than instantaneous chiller systems

• Ice Thermal Storage Uses Less Energy

  • During daytime, chillers operate at higher supply temperatures and greater efficiency when piped upstream of the ice storage
  • At night, chillers operate when ambient temperatures are lower
  • Pump and fan energy can be less when colder system supply temperatures are used

Typical Schematic System

Ice Thermal Storage

Reduces Operating Costs

  • Reduces air conditioning kW demand by approximately 40%
  • Reduces air conditioning kWh by up to approximately 15%
  • Reduces electric utility costs
  • Large percentage of energy usage is at night
  • Daytime energy costs 2 to 5 times more than night time energy

Advantages of Cold Supply Water Temperature

  • Smaller distribution pumps and piping
  • Reduced pumping power
  • Allows for economical building isolation (indirect interface) with smaller heat exchangers
  • Provides better dehumidification and indoor air quality(IAQ) 78°F (25.5°C) at 40% RH is more comfortable than 76°F (24.4°C) at 50% RH
  • Cold air distribution

Application for Ice Storage Projects

  • Commercial A/C and industrial
  • Schools
  • Hospitals
  • Office buildings
  • Internet data centers
  • Hotels
  • Airports
  • Sports venues
  • Manufacturing plants
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