Is it a real project(create real device) or is it a homework problem?

Theoretically, the efficiency for carnot cycle only depends on temperature T1, T2.
Do you know about [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=23.0]carnot cycle[/url]? You should be able to find it in standard thermodynamic text-book.