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23 71 16

Chilled-Water Thermal Storage

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MasterFormat Division 23 71 16: Chilled-Water Thermal Storage

MasterFormat Division 23 71 16 covers the requirements for chilled-water thermal energy storage systems. These systems play a crucial role in optimizing building energy efficiency by shifting cooling loads from peak to off-peak hours. This article delves into the details of chilled-water thermal storage, exploring its definition, functionality, applications, installation best practices, and leading manufacturers.

What is Chilled-Water Thermal Storage?

Chilled-water thermal storage is a technology that utilizes water's high heat capacity to store thermal energy. It involves chilling water during periods of low energy demand, typically at night, and then using this chilled water to cool buildings during peak demand periods, such as hot afternoons.

How Does Chilled-Water Thermal Storage Work?

A chilled-water thermal storage system usually comprises the following components:

  • Storage Tank: A well-insulated tank that holds the chilled water.
  • Chiller: Cools the water, typically during off-peak hours.
  • Pumps: Circulate the chilled water between the storage tank and the building's cooling system.
  • Heat Exchangers: Transfer thermal energy between the chilled water loop and the building's cooling distribution system.
  • Controls: Manage the charging and discharging cycles of the storage system based on energy tariffs and building cooling needs.

During off-peak hours, the chiller cools the water and stores it in the insulated tank. When cooling demand rises, the chilled water is pumped from the tank to the heat exchangers, where it absorbs heat from the building's cooling water loop. This chilled water then cools the building, reducing the load on the chiller during peak hours.

Where is Chilled-Water Thermal Storage Commonly Used?

Chilled-water thermal storage systems are advantageous in various building types, including:

  • Commercial offices
  • Hotels
  • Hospitals
  • Universities
  • Data centers
  • Industrial facilities with high cooling loads

They are particularly beneficial in areas with high peak electricity demand charges and where nighttime electricity rates are lower.

What are Installation Best Practices for Chilled-Water Thermal Storage?

Proper installation is crucial for optimal performance and longevity of a chilled-water thermal storage system. Key best practices include:

  • Proper Sizing: Accurate system sizing based on building load calculations and energy consumption patterns is essential.
  • Tank Insulation: High-quality insulation for the storage tank minimizes heat loss and ensures maximum energy savings.
  • Pump Selection: Selecting energy-efficient pumps optimized for flow rates and head pressure requirements enhances system efficiency.
  • Control System Integration: Seamless integration of the storage system controls with the building automation system is critical for efficient operation and energy management.
  • Commissioning: Thorough testing and commissioning verify system performance and identify any potential issues early on.

What are the Top Manufacturers for Chilled-Water Thermal Storage?

Several reputable manufacturers specialize in chilled-water thermal storage systems. Some of the industry leaders include:

  • EVAPCO, Inc.
  • CALMAC
  • Baltimore Aircoil Company (BAC)
  • VIKING COOLING
  • Johnson Controls

These manufacturers offer various solutions, including different tank sizes, chiller types, and control system options.

Conclusion

Chilled-water thermal storage systems offer a proven and effective solution for optimizing building energy efficiency and reducing operating costs. By shifting cooling loads to off-peak hours, these systems capitalize on lower electricity rates and minimize peak demand charges. When considering a chilled-water thermal storage system, prioritize proper system design, high-quality components, and adherence to installation best practices. Consult with experienced engineers and reputable manufacturers to ensure optimal system performance and long-term energy savings.

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