Assessment of a Real Combined Cycle Power Plant with Supplementary Firing Based on Advanced Exergy/Exergoeconomic Methods

Numerical Simulation of Beta Type Stirling Engine Considering Heat and Power Losses In this paper, numerical solution of beta-type Stirling engine was presented considering its non-ideal regenerator. To this end, the second-order model including heat and power losses was used. Then, a numerical code was applied for calculating geometrical and physical optimum values of the engine. To confirm the obtained results, the physical and geometrical parameters of the GPU-3 engine were used. According to the obtained results, the values of heat and power losses in the engine were considerable. Based on the results, heat and power losses in the engine led to decreased power and efficiency by 50.1% and 22.7%, respectively. According to the results from the numerical code, the amounts of porosity, frequency, and length of the regenerator were suggested as less than 0.6, 40 to 50 Hz, and 18 to 22 mm, respectively. The results showed a material with high thermal capacity and low conductivity in the optimum physical and geometrical conditions of the engine.