Stirlingengineforum.com

what is the temperature that can operate a stirling engine with 43kW?
is the RPM varies directly with the temperature of the flame?

Thanks

It depends on the material the hot end is made of, but 304 stainless steel will go up to 870*C, the flame temperature would be a good bit greater than that. 446 stainless 1100*C, 2111HTR 1150*C, A-286 alloy 982*C, Super Inconel 718 704.4*C, this is used in the hot end of gas turbine engines. Ian S C

in what tempereture that the stirling engine can operate? at maximum output and in minimum output?

You'll have to get in contact with a comercial Stirling Engine manufacturer. It's an international market, so the manufacturer may well be on the other side of the world,so shipping and other costs will have to be taken into account. I would budget for anything up to $100,000, they may have to build one specially for you, it could be more. You might be better off with an oil fired boiler, and a steam engine, maybe a turbine. Ian S C

It 'clear that the power output is proportional to the difference of temperature between the hot and cold site. The cold temperature can not be below ambient one.
The hot site temp. depends on the heat strength of materials, materials of good quality can reach 800 to 900 ° C.
It 's also clear that the power is not beared only on the temperature, but also by the flow of heat (heat quantity=enthalpy) administered, and the physical characteristics of the engine (displacement, exchange surfaces, architecture of the engine).
Then make a direct association between temperature and power does not make much sense.

Of course, in the case of maximum temperatures are considered special nickel alloys, very expensive, or ceramic materials of high-tech, very heat conducting, or in some cases very isolating, but mechanically very efficient.
These are very sophisticated technologies that normally only large industries have faced, covering with patents, with often divergent solutions. For reasons of cost the most extreme solutions may be are discarded.

Theoretically you could work a Stirling engine with a difference of temperatures of a few tens of degrees Celsius, but experience has taught that this is extremely difficult (if you want to achieve significant power), plus the difference decreases as the engine must be large (for adequate power) in such a case, however, the friction becomes dominant, and the powers collapse