•The specific enthalpy of steam enters and leaves a steam turbine are 2915kJ/kg and 2355kJ/kg. Heat loss of the turbine is about 8kJ/kg. Kinetic energy and potential energy can be neglected.

Find the work done by 1 kg of steam. •A heat exchanger works at 1 atm pressure and power of 2.0×106W, temperature of cold water enters the heat exchanger is 15°C as secondary side coolant. Find the minimum flow rate of coolant if the maximum outlet temperature is limited to 25°C.