1. Acoustic Refrigeration
Isaac Lockman

2. Foundation Thermoacoustic Refrigeration Alternative
Replaces Compressor with a loud speaker
Substitutes conventional refrigerants for inert gases (i.e. helium)
Figure 1: Conventional Refrigeration Cycle
Acoustic Refrigeration - Isaac Lockman

3. Operation Increase Pressure raise Temperature
Diffusion of heat to or from stacks: Thermal Penetration
Standing Wave: Pressure in phase with Displacement
Figure 2: Acoustic Refrigeration Cycle
Acoustic Refrigeration - Isaac Lockman

4. Acoustic Refrigeration - Isaac Lockman
Application
Existing
NASA
Preserve blood and urine samples
U.S. Navy
Cool radar electronics onboard warships
Potential
Marine Vehicles
Replace Noisy Generators
Satellite Sensors
Super-Fast Computers
Acoustic Refrigeration - Isaac Lockman

5. Figure 3: Penn State Thermoacoustic Refrigerator
Acoustic Refrigeration - Isaac Lockman

6. Motivation One moving part Applicable to existing Systems
Yields 30% Carnot Cycle Efficiency
Applicable to existing Systems
Minimal Maintenance
No CFC’s or HFC’s
Less Energy Wasted
Regenerative
Figure 4: Car Stereo Cooler
Acoustic Refrigeration - Isaac Lockman

7. Acoustic Refrigeration - Isaac Lockman
References
Acoustic Refrigeration - Isaac Lockman

8. Acoustic Refrigeration - Isaac Lockman
Q & A
Acoustic Refrigeration - Isaac Lockman