8. (6 %) Write and explain the expression of energy balance, entropy balance and exergy balance for a closed system.

5. (6%) Consider a thermal energy reservoir at 1227*C that can supply heat at a rate of 150,000 kJ/h to an engine. Determine the maximum output power (in kW unit) of the engine, assuming an ambient temperature of 25C. Will higher temperature of heat source increase the maximum power?