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Performance analysis of energy conversion via caloric effects in first-order ferroic phase transformations
1Aerospace Engineering and Mechanics, University of Minnesota, 110 Union Street SE, 107 Akerman Hall, Minneapolis, Minnesota, USA. ytsong@umn.edu.
Physical Chemistry Chemical Physics : PCCP
|May 20, 2014
Summary
This study models ferroic refrigerators and generators using phase transformations for direct heat-to-electricity conversion. Optimized cycles show efficiency approaching Carnot limits, with criteria for material and temperature selection.
Area of Science:
- Thermodynamics
- Materials Science
- Energy Conversion
Background:
- Ferroic materials exhibit phase transformations with unique properties.
- Novel methods for direct heat-to-electricity conversion are crucial for energy efficiency.
Purpose of the Study:
- To develop a finite-time thermodynamic model for ferroic refrigerators and generators.
- To evaluate a new heat-to-electricity conversion method based on martensitic phase transformation.
- To derive formulas for efficiency and power output and introduce a figure of merit.
Main Methods:
- Finite-time thermodynamic modeling of ferroic phase transformations.
- Derivation of efficiency and power output formulas.
- Optimization of thermodynamic cycles for maximum power output.
Main Results:
- The Clausius-Clapeyron coefficient significantly impacts efficiency.
- A dimensionless figure of merit is introduced, approaching Carnot efficiency at infinity.
- Optimized cycles yield matching criteria for materials and working temperatures.
Conclusions:
- The developed model provides a framework for understanding and optimizing ferroic energy conversion.
- The derived criteria facilitate the selection of optimal materials and working conditions.
- This research advances the field of direct heat-to-electricity conversion using phase transformations.
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