A combination of a heat engine driving a heat pump (see Fig. P7.86) takes waste energy at

Question:

A combination of a heat engine driving a heat pump (see Fig. P7.86) takes waste energy at 50°C as a source Qw1 to the heat engine rejecting heat at 30°C. The remainder Qw2 goes into the heat pump that delivers a QH at 150°C. If the total waste energy is 5 MW find the rate of energy delivered at the high temperature.