Beta Type Stirling Engine. Schmidt and Finite Physical Dimensions Thermodynamics Methods Faced to Experiments.

Area of Science:

• Thermodynamics
• Mechanical Engineering
• Energy Systems

Background:

• Stirling engines offer a promising alternative for energy conversion.
• Accurate thermodynamic modeling is crucial for optimizing Stirling engine design and performance.
• Existing models often require complex calculations or lack practical engineering parameters.

Purpose of the Study:

• To develop and validate two simplified analytical models for a beta-type Stirling engine cycle.
• To assess the ability of these models to predict engine behavior and energy losses.
• To express energy exchanges using practical engineering parameters for design applications.

Main Methods:

• Application of the Finite Physical Dimension Thermodynamics (FPDT) method.
• Development of a 0D model using the imperfectly regenerated Schmidt model.
• Experimental testing of a beta-type Stirling engine for validation.
• Kinematic-thermodynamic coupling for evaluating energy processes based on crankshaft angle.

Main Results:

• Both models successfully indicate Stirling engine behavior, accounting for heat exchanger irreversibility and imperfect regeneration.
• Energy loss contributions were determined and compared between the two models and experimental results.
• Theoretical predictions showed good agreement with experimental data, particularly regarding the effect of engine speed on power and efficiency.

Conclusions:

• Simplified thermodynamic models can effectively predict Stirling engine performance.
• The study highlights the importance of considering irreversibility and regeneration in Stirling engine analysis.
• Practical engineering parameters are crucial for translating theoretical models into real-world applications.