2a3 rugel ice storage innovations
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Ice Thermal Storage
Innovations
for District Cooling
Ice Thermal Storage
Innovations
for District Cooling
Gary Rugel
Vice President, International
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Ice Thermal Storage InnovationsIce Thermal Storage Innovations
External Melt (Direct Contact) Ice Coils
Product
Application
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Review Advantages of Ice Thermal StorageReview Advantages of Ice Thermal Storage
Reduced capital costs
Only ~85-90% of chillers and heat rejectionequipment plus associated electrical distribution
equipment is required
Efficient use of daytime energy
Increased flexibility to adapt to changing utility
structures and requirements
Reduces need for new power plants by lowering
peak electric load profile and better utilizing existing
electrical generation and distribution infrastructure
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Ice Storage Product InnovationIce Storage Product Innovation
External Melt (Direct Contact) Ice Coils
Elliptical TubeRound Tube Elliptical Tube
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Ice Storage Product InnovationIce Storage Product Innovation
Ice Coils with Elliptical Tubes
Less wasted space
Better ice packing factor (IPF)
External Melt (Direct Contact) Ice Coils
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Ice Storage Application InnovationIce Storage Application Innovation
Entergy Solutions
Houston, Texas
IDEA Member
Plant constructed in 1998
Expanded in 2008
25,000 TR peak capacity
88,000 ton-hours ice storage
1C chilled water supply
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Entergy Solutions Houston
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Entergy Houston 2008 Capacity Upgrade
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Entergy Houston 2008 Capacity Upgrade
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Entergy Houston 2008 Capacity Upgrade
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Entergy Houston 2008 Capacity Upgrade
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Entergy Houston 2008 Capacity Upgrade
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Key Advantages of Ice Thermal StorageKey Advantages of Ice Thermal Storage
Reduced thermal energy storage space
Colder supply water temperatures
Increased operational flexibility
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Key Advantages of Ice Thermal StorageKey Advantages of Ice Thermal Storage
Reduced thermal energy storage space
Ice Storage requires 1/4 to 1/6 of the space ofchilled water storage
41.4 kW-Hr/m
(1 Ton-Hr/3 ft)
Ice storage insensitive to system T
Lower real estate costs
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55m
55m
18m
H
55m D x 16m H
IceSto
rage
15mx
45m
12mH
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Key Advantages of Ice Thermal StorageKey Advantages of Ice Thermal Storage
Colder supply water temperatures
Smaller distribution pumps and piping
Reduced pumping power
Allows for economical building isolation (indirect
interface) with smaller heat exchangers
Super high-rise building temperature cascade for
pressure isolation
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External Melt (Direct Contact) Ice CoilsExternal Melt (Direct Contact) Ice Coils
1C CW Supply
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Colder Supply Water TemperaturesColder Supply Water Temperatures
CW Supply Temp. CW Flow* Difference
5C (41.0F) 7530 m/h (33170 gpm) Base
4C (39.2F) 6700 m/h (29480 gpm) -11%
3C (37.4F) 6030 m/h (26530 gpm) -20%
2C (35.6F) 5480 m/h (24120 gpm) -27%
1C (33.8F) 5020 m/h (22110 gpm) -33%
*13C (55.4F) CW Return Temp.
70 mW (19,900 Ton) Peak Load
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Key Advantages of Ice Thermal StorageKey Advantages of Ice Thermal Storage
Colder supply water temperatures
Smaller distribution pumps and piping
Reduced pumping power
Allows for economical building isolation (indirect
interface) with smaller heat exchangers
Allows for reduced air handler fan kW
Lower supply air temperature and increasesupply air T by 2C
13C/25C to 11C/25C
Saves 27% fan kW
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Key Advantages of Ice Thermal StorageKey Advantages of Ice Thermal Storage
Increased operational flexibility
Discharge very quickly
As fast as 1 to 2 hours
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External Melt (Direct Contact) Ice CoilsExternal Melt (Direct Contact) Ice Coils
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Key Advantages of Ice Thermal StorageKey Advantages of Ice Thermal Storage
Increased operational flexibility
Discharge very quickly
As fast as 1 to 2 hours
Following power interruptions, ice storage can
recover loop temperatures in minutes versus hours
Series arrangement
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External Melt Piping SchematicExternal Melt Piping Schematic
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Key Advantages of Ice Thermal StorageKey Advantages of Ice Thermal Storage
Summary
Reduced capital costs
Colder supply water temperatures
Increased operational flexibility
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THANK YOU!THANK YOU!