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Our company produces excess heat energy from the hot forging
process. What input temeratures are required to enable a Stirling
engine to be able to produce a reasonable amount of energy? Is there
any table or refernace material on this topic?

Rick,

1000 to 1400 degrees F. would provide enough efficiency to make a heat recovery cost effective (reasonable payback time).

This is based on the Carnnot equasion. (Google it for more).

Rick