At steady state, a device receives a stream of saturated water vapor at 210 degrees C and discharges a condensate stream at 20 degrees C, 0.1 MPa while delivering energy by heat transfer at 300 degrees C. The only other energy transfer involves heat transfer at 20 degrees C. Kinetic and potential energy changes are negligible. What is the MAXIMUM theoretical amount of energy, in kJ per kg of steam enterind, that could be delivered at 300 degrees C?