02-03-2013, 02:18 PM
COOLING EFFECT USING SOUND WAVES
COOLING EFFECT.pptx (Size: 337.45 KB / Downloads: 136)
MAIN COMPONENTS
Speaker
Gas
Tube
Stack
Heat Exchangers
STACK: The most important part of a thermoacoustic device is the stack. The stack consists of a large number of closely spaced surfaces that are aligned parallel to the to the resonator tube. The purpose of the stack is to provide a medium for heat transfer as the sound wave oscillates through the resonator tube.
RESONATING TUBE: The standing sound wave is produced in a resonating tube.
HEAT EXCHANGER: Both ends of the stack is connected to heat exchangers, thus coupling the stack to a heat source or heat sink, the transfer of heat would be more efficient.
WORKING
Stack contains gas parcels
Standing wave carries the parcel left and right
Temperature changes due to gas oscillations in the stack
Left parcel rejects heat to the stack
Right parcel absorbs heat from the stack
ADVANTAGES
No moving parts hence Mechanically Simple
Environmentally friendly-Harmful Refrigerants
Use of simple materials
Saves energy
Economic potential
Large range of working temperatures
No sliding seals or lubrication
CONCLUSION
Thermoacoustic refrigerators use sound waves to generate cooling and also they use inert gases that are friendly to the environment.
The effectiveness of thermoacoustic refrigeration for electronic devices, low cost, high efficiency cooling devices have broad applications in commercial industries and households.
Thermoacoustic refrigerators use acoustic waves to transfer heat.