Given 0.603MW electrical power supplied to a boiler when the temperature of the entering water is 20 C and the exiting temperature is 89 C. The flow of.the pressured water is 2 Kg/s. There is a negligible pressure drop through this boiler and it operates at a constant pressure of 3 bars. The specific heat is c = 4,370 J/(Kg K).  a) Calculate the total rate of entropy production b) Calculate the total rate of exergy destruction (W). The dead state temperature is 293.2 K and pressure is 1 bar. c) Calculate the mass flowrate of fuel (natural gas, CH4) required to heat the water flow to the conditions of the problem if the electrical heating device is replaced with a gas fired boiler. The high heating value (HHV) of the fuel is 50.02 MJ/kg.

From the turbine the heat loss per kg of steam flow rate is 5 kW. Find the power developed in kW by the steam turbine per kg of steam flow rate?

Problem 3): Steam flows through an adiabatic turbine at a 10 kg/s steady rate, entering the turbine at 4 MPa, 500°C, and 70 m/s. The steam leaves the turbine at 30 kPa, 40 m/s and with an enthalpy of 2438 kJ/kg. Calculate: a) The phase and specific volume of the steam at the turbine exit. b) The power generated by the turbine. c) The cross-sectional area at the turbine exit. d) The rate of entropy change of the steam during this process.

Steam expands from 9.0 MPa and 4500C to saturated vapor @75 kPa through an adiabatic turbine. If the mass flow rate is 20 kg/s, how much power will be generated (in MW)? 22.7 B) 25.3 11.9 D 7.95

1. Assume 1 kg of steam expand isentropically from 2 MPa and 360°C to 0.040 MPa. Find: a) work for non-flow b) work for steady flow If the steam expands to same exhaust pressure and at 100°C, find: c) actual work for non-flow system

Isentropic efficiency of a turbine. If the process between the inlet state and the exit pressure.

Air is used as the working fluid in a turbine. At the inlet, the air is at 1100 K, 1050 kPa. It is flowing at a rate of 10 kg/s, having a velocity of 30 m/s. At the outlet, the air is 500 K, 98.61 kPa, and flowing at 45 m/s. Assuming that the specific heat of the air is constant (at the average temperature) during the process, what is the power output of the turbine in MW? MW (CC) BY-NO-SA Niel Crews, 2013

Nitrogen at a flow rate of 0.1 kg / s enters a heat exchanger at a temperature of 450 K and 320 It comes out at K temperature. The other fluid of the heat exchanger is water, it enters at 20 ° C and leaves at 35 ° C. a) Calculate the flow of water. b) Calculate the entropy generation in this heat exchanger. (Take the average specific heating heat for nitrogen as 1.042 kJ / kgK.)