圧縮比・熱源温度比・作動ガス比熱比によるエントロピ生成の特性

抄録

The author made clear in the previous report that the minimization of entropy generation can be used to optimize Stirling engine parameters. In this report the effects of compression ratio, temperature ratio of heat source and sink and specific heat ratio of working gas on entropy generation are examined. In addition to these parameters engine speed and heater/cooler capacity are changed to obtain entropy generation due to heat transfer, mixing of gas with different temperatures and flow resistance. Entropy generation was evaluated in values of that per net work at the maximum power against engine speed. It has a minimum when heater/cooler capacity and compression ratio are changed. The compression ratio where entropy generation per net work takes the minimum increases with temperature ratio with different slope.The range of compression ratio where entropy generation per net work is not so large as the minimum is wide when the temperature ratio is large and specific heat ratio is small.