الفهرس | Only 14 pages are availabe for public view |
Abstract The use of internally-finned tubes in the cooler and heater design of Stirling engines is investigated in this thesis A brief description of Stirling engines and their types and applications are summarized showing their advantages and disadvantages . A number of different commercial tubes and another tube designed and manufactured by the author were tested to determine their heat transfer and fanning friction characteristics . One of the commercial tubes was chosen to be used in the design of the cooler and heater of a 140 kw Gamma Stirling engine after the correlations describing its characteristics had been found. It was found that one of such tube can replace 40 plain tubes having 4 mm. inside diameter for the same dead volume, the same pressure drop and the same heat transfer . The theoretical work was undertaken to analyze the engine cycle assuming two ideal cases, namely, the isothermal analysis and the adiabatic analysis. The second order analysis was also applied to the case study engine to get more realistic results and for the optimization of the dimensions and working conditions The fmal proposed design of the engine is also given and recommendations for future work are suggested |