The methods of thermodynamic calculation which I’m going to talk about in this article may seem simple & easy but if you dont pay attention to them , the engine may not work properly or not work at all in a way that some parts of engine would prevent it to run.
power & displacer piston
the ratio of dimensions of the two piston can be calculated from the simple thermodynamic instruction in a way that the basic principle of calculating is that the gas is moved in volume of dicplacer cylinder itself wich we call it effective volume dicplacer cylinder.
This volume of gas is expanded and is entered in power cylinder and push it back. In some cases which the power cylinder volume is half of dicplacer cylinder volume, effective volume is equal to multiplication of cross section of dicplacer cylinder to the course of dicplacer piston.
The volume of the power cylinder(the multiplication of its cross section to its course) can be calculated from simple thermodynamic instructions and having the information of temperature diffrence of cold and hot resevoir . for example for an engine which its temeratures are 55°c & 255 °c for ideal gas ,61% expansion happens which means if power cylinder volume designed more than 61% of dicplacer cylinder volume because of gage pressure negative work will generate in engine wich will bring the engine in trouble while expanding.
But if it becomes less than 61% the power of engine becomes more.and you must pay attention that if this ratio be very lower than 61% ,the engine would become lazy and engine revolvement will become less.
Some maps and picture of simple gama stirling engine
stirling solar generator 
hasan said,
May 22, 2010 @ 11:22 am
how lubricate displacer