THERMAL ENERGY STORAGE

THERMAL
ENERGY
STORAGE
Benefits & Applications – Why Owners Love TES
hermal nergy torage (
)
• Financial Benefits
• Benefits & Applications
• TES & the Electric Grid
THERMAL ENERGY STORAGE with
Chilled Water District Cooling Systems
TES provides daily dispatch-able electrons
Commercial / Industrial TES Systems
• ICE STORAGE
– Energy in an ice phase
– Relatively small
footprint, ideal for
urban applications
• CHILLED WATER
– Energy in the chilled
water phase
– Economical in larger
applications
Significant Financial Benefits
1. Energy Cost Savings - using electrons
wisely
2. Cost Avoidance - when expanding the
campus
3. Insurance - no downtime of mission critical
processes
1. Energy Costs Savings
• Shift electric load from peak periods to off-peak periods
• Reduces energy use by taking advantage of cooler
ambient conditions at nighttime and running chillers at
their optimum conditions
LOAD PROFILE WITHOUT TES
LOAD PROFILE WITH TES
It doesn’t matter if the campus is in a
regulated or de-regulated utility area
1. Typical Energy Cost Savings Application
• Rate Based Savings
– Regulated Utility Area
• TOU Demand rate component, and/or
• TOU Usage rate component
– De-regulated Utility Area
• Variable rates change on an hourly basis but historical
trends indicate that rates spike up during peak afternoon
periods when the electric grid is stressed
• Negotiate better rates with a TES tank
• Avoid hidden costs like the Mean Coincident Peak (MCP)
Orlando, FL – UCF TES Project
• Scope of Work:
– New 3.0 MG TES Tank
– New CHW pumps, piping
and controls
– Chilled water control strategy
that takes advantage of offpeak electric rates
Orlando, FL - UCF
• Project Performance:
– Estimated energy cost
savings of over $700,000
annually
– Rebate from the utility
company of $637,000
1. Example Applications of Energy Cost Savings
> College Campuses
Healthcare <
> Government Municipalities
Airports <
> Private Industry
2. Cost Avoidance – When Expanding
• District Cooling Systems
A. Serving campuses
B. Serving Natural Gas (NG) power plants
2. a) Costs Less to Expand the Capacity
• Instead of adding more
mechanical & electrical
equipment such as
chillers, pumps,
condensing equipment
• Utilize the excess cooling
capacity of the existing
equipment, and add a TES
system
Example Applications of Costs Avoidance when Expanding the
Cooling Capacity
> College Campuses
Healthcare <
> Government Municipalities
Airports <
> Private Industry
2. b) Cost Avoidance – Power Plants
Natural Gas Power Plant
2. b) Cost Avoidance at Power Plants
NG power plant that utilizes Turbine Inlet Cooling & a TES
system; increases power output, lowers parasitic electric
load during peak, and provides grid reliability.
Combustion Turbine
Jacksboro, TX – NG Power Plant
• Scope of Work:
– New 6.0 MG TES tank coupled with
– New 14,500-ton modular CHW plant
with cooling coils
• Project Performance:
– Reduced inlet combustion air temp
to 50°F on peak summer days
– Increased power generation
capacity by a net 110 MW
Example Applications of Cost Avoidance and Expanding Power Output at NG Power Plants
Escondido, CA – SDG&E <
> New Canton, VA – Domain
Cleburne, TX - Brazos Electric <
3. Insurance – No Downtime of Cooling Supply for Mission Critical
Facilities
When the chillers go down unexpectedly, chilled water
needs to continue to flow to prevent processes from
overheating.
Example Applications of Insurance – No Downtime for Mission
Critical Facilities
> High Tech Manufacturing
Data Centers <
Some Other Benefits of TES
• Redundancy of stored Chilled Water for
those unexpected outages
• Tank can be dual purpose; fire protection
or condenser water back-up
• Reduce daytime noise on campus
• Reduce air emissions at the source
• Improved grid reliability
Storage – The Future and with Renewables
• The value of storage continues to grow:
– HVAC loads drive demand, widening the
gap between peak and base load demand
– Time-of-day differentials grow in marginal
heat rates, emissions, and value of
electricity
– Intermittent power generation from
renewable energy sources (like wind
power) grows, but is sometimes out of
phase with electric demand
• TES is proven, economical energy
storage that play a key role in electric
power systems now and in the future.
GUY FRANKENFIELD, P.E.
Office (972) 823-3300
Mobile (214) 755-4610
Email [email protected]