A method for evaluating the heat rejection efficiency in a Lunar power plant consisting of a free-piston Stirling engine (FPSE)Sergey Smirnov, Mikhail Sinkevich, Yuri Antipov and Hassan KhalifeE3S Web Conf., 313 (2021) 07001DOI: https://doi.org/10.1051/e3sconf/202131307001