Chapter 8, Problem 8.93P

During an isentropic process of 3 lb/sec of air, the temperature increases from 50 deg F to 290 deg F. Find the work for a nonflow process.

A refrigerator compressor receives R-134a at a rate of 0.08 kg/s at -10 C, 150 kPa and delivers it at 1000 kPa, , 50 C. The input power to the compressor is 3.5 kW. The compressor is cooled with atmospheric air coming in at 25 C and leaving at 32 C. Determine the mass flow rate of airTake the air as an ideal gas with constant specific heat Cpair . That ish4-h3 = Cpair (T4-T3)

A piston/cylinder receives (control mass system) R-134a at 300 kPa and compresses it in a process where the entropy does not change. to a state of 1000 kPa, 60° C. Find the initial temperature, AND THE CHANGE IN INTERNAL ENERGY.

A steam turbine has an inlet of 3 kg/s water at 1200 kPa and 350°C with a velocity of 15 m/s. The exit is at 100 kPa, 150°C and very low velocity. Find the specific work and the power produced.

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.

There are required 2000 kW of compressor power to handle air adiabaticallyfrom 1 atmosphere, 27 oC, to 305 kPaa. The initial air velocity is 20 m/s and the finalvelocity is 85 m/s. a) If the compression is isentropic, find the compressor capacity, inm3/s. b) If the compression process is irreversible adiabatic to a temperature of 160 oC,with the capacity found in c), determine the compressor power input, in Hp.

A compressor has R-134a entering at 10°C, 100 kPa and exiting as a saturated vapor. It is given that this particular compressor also involves heat loss (i.e., this compressor, in a non-typical fashion, has a non- zero q; i.e., you cannot neglect q for this compressor). If the compressor operates in a reversible isothermal manner, find the specific heat transfer and specific work.

Refrigerant R-410a inters a refrigerator compressor at a pressure of 150 kPa, -10 c° and leaves at 1200 kPa, 50 c° with mass flow rate of 3 kg/s. the compressor is water cooled and the heat loss to the water Qloss is 20 kW. Determine the compressor input work W.. Note: Neglect potential and kinetic energy in your calculations. 1 2 CN Compressor cool

I do not understand the chapter in general. May you please explain why you completed each step as you have. Thank you.