Enhancement of the thermoacoustic effect
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Solution Overview
Problem
Existing thermoacoustic devices face challenges such as low power density requiring high pressures, energy losses due to non-linear phenomena, and inefficient heat exchange, which hinder widespread commercial adoption and efficiency.
Innovation Solution
Incorporating phase-changing components into the gas mixture within thermoacoustic systems to enhance energy density and efficiency, utilizing methods like open cell absorptive stacks, corrugated channels, and direct heat and mass transfer through working fluids to manage liquid replenishment and improve heat exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If gas is pressurized above 30 bars to achieve useful power output, then power density is improved, but sealing and safety challenges worsen
Solution Approach 1:
The patent changes the thermodynamic parameters of the working fluid by introducing phase-changing components (water, alcohol, acetone) into the helium gas mixture. This allows the system to operate at lower pressures (below 30 bars) while maintaining useful power output, as the phase change processes provide additional energy transfer mechanisms that enhance the thermoacoustic effect.
Solution Approach 2:
The working fluid is formulated as a composite mixture containing helium (inert gas) combined with phase-changing components (water, alcohol, acetone). This composite fluid leverages both the acoustic properties of helium and the latent heat transfer capabilities of the phase-changing substances, enabling efficient energy conversion at reduced pressures and eliminating the need for high-pressure containment systems.
2Power
If non-linear phenomena occur at high amplitudes, then acoustic energy conversion is enhanced, but energy losses increase
Solution Approach 1:
The patent exploits phase transitions (vaporization and condensation) of the added components as a mechanism to manage non-linear acoustic phenomena. During high-amplitude oscillations, the phase-changing substances absorb excess energy during vaporization and release it during condensation, effectively damping non-linear effects and reducing energy losses while maintaining strong acoustic coupling.
3Power
If heat exchange surfaces maximize heat transfer, then power output is improved, but hindrance to oscillating gas flow increases
Solution Approach 1:
The patent changes the thermal and acoustic parameters of the working fluid through phase-changing components, which fundamentally alter the heat transfer mechanism. Instead of relying solely on conductive heat exchange through solid surfaces, the system utilizes latent heat transfer during phase changes, which occurs throughout the bulk fluid and is less sensitive to surface geometry, thereby reducing flow resistance while maintaining high power output.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed methods enable operation at lower pressures and temperatures, increase energy density, and introduce mixture separation capabilities, significantly improving the performance and efficiency of thermoacoustic devices.
Implementation Method 1
Incorporating phase-changing components into the gas mixture within thermoacoustic systems to enhance energy density and efficiency
Implementation Method 2
direct heat and mass transfer through working fluids to manage liquid replenishment and improve heat exchange
Implementation Method 3
direct heat and mass transfer through working fluids
Implementation Method 4
Thermoacoustics—When interacting with a liquid or solid structure, oscillating gas flows (i.e., sound waves) can carry a net time-averaged flux of heat and mass
Implementation Method 5
direct heat and mass transfer through working fluids
Implementation Method 6
oscillating gas flows (i.e., sound waves) can carry a net time-averaged flux of heat and mass
Data Source
AI summary
A thermoacoustic device that includes a resonator, wherein the resonator includes a stack. During operation, a cold zone of the stack is configured to receive at least one fluid from a hot zone of the stack; wherein a temperature of the hot zone exceeds a temperature of the cold zone. The thermoacoustic device also includes a conveyor for conveying at least some of the at least one fluid from the cold zone of the stack to the hot zone of the stack.