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Small-scale PHES DemonstrationBrittany Tom, Southwest Research Institute
Bringing the Brayton Battery to life:
Solving system integration and operation challenges
Total project cost: $2.5M
Length 27 mo.
Project Vision
The Concept: Pumped Heat Energy Storage (PHES)
Charge Mode: Heat Pump Discharge Mode: Heat Engine
Charge
Compressor
Charge
Turbine
Hot Heat
Exchanger
Cold Heat
Exchanger
Q
Q
Discharge
Compressor
Discharge
Turbine
Hot Heat
Exchanger
Cold Heat
Exchanger
Q
Q
Cold Source Tank
Hot Storage TankHot Source Tank
Cold Storage Tank Cold Source Tank
Hot Storage TankHot Source Tank
Cold Storage Tank
WorkinWorkout
1
The Team: Southwest Research Institute (SwRI)
▸ Independent, nonprofit applied research and development organization founded in 1947
– Nine technical divisions
– 2,800 staff
▸ Machinery Department
– 60 engineers/ technicians
– Design, Analysis and Testing
– Turbomachinery
– Thermodynamic cycle
– Fluid/Thermal Systems
– Rotordynamics
– Mechanical Systems (bearings, seals, etc.)
2
2.1 Miles
1.2
Mile
s
The Team: Machinery Department Test Facilities
3
Multiphase Machinery
Laboratory Turbomachinery Laboratory
Gas Turbine Laboratory
Recip
Compression
Laboratory
‣ Advance PHES from concept to a kW-scale system demonstration
– TRL 2 TRL 4
‣ Focus on system operation and integration
‣ Performance data gathered during testing to verify system model
– Scale to predict full scale performance (10 MWe, 10 hrs at rated power)
Project Overview
4
Procurement and Assembly
Design Phase
Commissioning and Test
9 months
9 months
9 months
• Develop steady state and
transient models
• Define control strategies
• Turbomachinery Design
• Balance of Plant Design
• Continue refining
system model
• Initial cost analysis on
full scale control
system
• Demonstrate system startup,
shutdown, mode change
• Demonstrate control of efficient
closed loop system
Challenges and Potential Partnerships
▸ System Operation
– First implementation may have unknown unknowns
– Closed cycle operation
• Startup, shutdown, mode switch, bootstrap
– Uncertain system design
▸ Control Strategy and Transient Model
– Optimizing design space for efficient operation
– Tuning the controls for optimized performance
▸ In discussions with potential project partners
5
RTE
RT
E
Charge PRCold Storage
Temp
Hot Storage
Temp
Charg
e P
RC
old
Sto
rage
Tem
p
Hot
Sto
rage
Tem
p