Diseño y construcción de un motor Stirling didáctico acoplado a un generador, y evaluación de la eficiencia energética del sistema

Abstract

The developed Stirling motor let visualize the thermodynamic cycle, also generate electricity and through real time data acquisition system, get a complete energy evaluation. Experimental and simulation phases are conjugated for all elements in a modular design which considers: geometry, closed system, work fluid and operation temperatures. Pressure, volume and torque versus angular position are thermodynamic diagrams which let determine the dimensions of the model for construction purposes. More important elements such as piston, camera and inertia mass are dimensioned. The motor is constructed and a generator is coupled to it. The data acquisition system let determine the motor real performance parameters, its efficiencies and the energy and exergy diagrams. The developed laboratory practice manual guides in the use of the equipment. The main characteristics of the motor are: fuel – alcohol, work fluid – air, temperatures from 50 OC to 250 OC, frequency – 350 rpm, net power – 1.6 watts, thermal efficiencies – 38.3% (ideal), - 27% (simulated) and – 17.9% (real), and the second law efficiency – 46.7%. So that, the thermodynamic impossibility of getting certain limits are confirmed.