Chapter 7, Problem 7.84P

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one kg of air is compressed in a cylinder according to the law PV^1.3= constant. If intital temperature is 100°C amd compression ratio is 15, find the work done and change in entropy of air.

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.

where do thet get the enthropy valvue for S2?

If the mass flow rate for air is 5 Kg/s .and air compressor takes in air at 200 kPa, 290 K and delivers it at 1.2 MPa, 600 K to a constant-pressure cooler, which it exits at 300 K. Take cp= 1.005 find 1- temperature exit for compressor is A- 290 K       B- 600 K       C - 300 K 2- work specific compressor is A- ( -211.55)       B- ( -311.55)       C- ( -411.55) 3- Specific heat transfer in the cooler is A- 301.5       B- 310.5       C- 320.5 4- Power the compressor is A- 1575.75       B- 1585.75       C- 1895.75

A two stage compressor receives 0.35 kg/s of air at 100 kPa and 269 K and delivers it at 5000 kPa. For minimum work and perfect intercooling find the amount of cooling water in the intercooler for 8oC water change of temperature.

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.)

A flow of 3 kg/s of superheated steam at 300 kPa and 300°C is mixed with liquid water at 300 kPa and 90°C so that the output is a flow of saturated steam at 300 kPa. Assume the mixing chamber is insulated, find the flow rate of liquid water needed for the process.

Thermodynamics sketch and label the turbine. Sketch and label the process on a T-s diagram also mentions all numbers on the process please. Thanks 7.56 A steam turbine has an inlet of 2 kg/s water at 1000 kPa, 400°C with velocity of 15 m/s. The exit is at 100 kPa, 150°C and very low velocity. Find the power produced and the rate of entropy generation.