Ben Welter - Friday, August 14, 2015
U.S. patent application 20150226500 (assignee Siemens AG, Munich):
"A cogeneration power plant and a method for operating a cogeneration power plant are provided, with a working medium being additionally cooled by a suitable heat pump between an outlet of a thermal heating device and an inlet of a power generator of the cogeneration process. The thermal power obtained in this manner is again available for heating purposes within the heat cycle. ... Advantageously, the thermal storage unit is a thermal storage unit with a phase-change medium. Such a thermal storage unit with a phase-change medium allows relatively large quantities of thermal energy to be stored in a relatively small volume."