Determine the heat transfer to the 300C thermal reservoir.

Question

A reversible heat engine operating between thermal reversible reservoir at 8000⁰C and 30⁰C drives a reversible refrigerator which refrigerates a space at 15⁰C and delivers heat to a thermal reservoir at 30⁰C. The heat input to the heat engine is 1900 kJ and there is a net work output from the combined plant (heat engine and refrigerator) of kJ. Determine the heat transfer to the 30⁰C thermal reservoir.