Steam flowing at a mass flow rate of 1500 kg/h, a pressure of 20 bar (abs) and 3
ID: 536755 • Letter: S
Question
Steam flowing at a mass flow rate of 1500 kg/h, a pressure of 20 bar (abs) and 350 oC is fed to a turbine that operates adiabatically and at steady state. The steam leaves the turbine at 1 bar (abs) and 150 oC and is then cooled in a heat exchanger to a saturated liquid. How much heat is removed in the heat exchanger? Steam flowing at a mass flow rate of 1500 kg/h, a pressure of 20 bar (abs) and 350 oC is fed to a turbine that operates adiabatically and at steady state. The steam leaves the turbine at 1 bar (abs) and 150 oC and is then cooled in a heat exchanger to a saturated liquid. How much heat is removed in the heat exchanger?Explanation / Answer
at 1 bar, the saturation temperature of steam is 100 deg.c. Hence steam leaving the turbine is superheated
at 1 bar and 150 deg.c, enthalpy of super heated steam = 2776.81 Kj/kg ( from steam table)
enthalpy of saturated liquid leaving the heat exchanged= 417.32 Kj/kg ( from steam table)
heat removed in the heat exchanger= enthalpy change in the evaporator= 2776.81-417.32 =2359.49 Kj/kg