Chapter 7, Problem 7.67P

4. An evaporator has R-410A at -20°C and quality 80% flowing in. The exit flow is saturated vapor at -20°C. a. Consider the heating to be a reversible process and find the specific heat transfer from the entropy balance. (Answer: 48.7 kJ/kg) b. If the heat source was at -10°C and the inlet and outlet streams still have the same properties as in a), calculate the specific entropy generation? (Answer: 7.33 J/(kg K))

A condenser (heat exchanger) brings 1 kg/s water flow at 10 kPa quality 95% to saturated liquid at 10 kPa. The cooling is done by lake water at 20 degree Celsius that returns to the lake at 30 degree Celsius. For an insulated condenser, find the flow rate of cooling water.

How much entropy is transferred if 200 W of thermal energy are transferred to a heat sink at 300K?

A steam with a quality of 49%, enters an adiabatic nozzle at 3.5 MPa and leaves at 0.4 MPa and 140 oC with a flow of 7 m/s. Find the entrance velocity, in m/s.

A steam turbine has an inlet of 4 kg/s water at 1000 kPa, 400 oC and velocity of 77 m/s. The exit is at 100 kPa, 150 oC and very low velocity. Find the specific work and the power produced.

A compressor receives R-410A as saturated vapor R-410A at 400 kPa and brings it to 2000 kPa, 60°C. Then a cooler brings it to saturated liquid at 2000 kPa (see Fig. below). Find the specific compressor work and the specific heat transfer in the cooler? A eccoi = Compressor Compressor section Cooler section

2. 1 kg/s steam enters the turbine at 2.5MPa and 500C while leaving at 10kPa with 89% quality. The pump exit condition is at 2.5 MPa and 50C. Find the turbine work output and heat added in the boiler in kW. (20 points)

Please be very detailed

steam at 11 MPa has a specific volume of 0.0196 m^3/kg , find the temperature, the enthalpy, and the internal energy.