Chapter 6, Problem 6.142EP

2.A piston cylinder arrangement contains steam at 10MPaa saturated liquid. Heat was transferred isothermally so that the pressure reaches 2MPaa. а. Find the final temperature of the steam. b. Find the change of entropy in kJ/kg if there is no entropy production.

Refrigerant 134a, to the evaporator of a refrigeration machine at 160 kPa pressure enters as a saturated liquid-vapor mixture, It receives 180 kJ of heat in an environment kept at -5 ° C then comes out as saturated steam at the same pressure. a) calculate the The entropy change of the refrigerant. b) calculate the entropy change of the cooled palace  c) Calculate the total entropy change for this process.

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1.A rotary compressor receives 6m3/min of gas (R=410 J/kg-K, k=1.67) at 105 kPaa, 26.85°C and delivers it at 630 kPaa; changes of potential and kinetic energies are negligible. Find the work in kJ/min if the process is a) isentropic, b) isothermal c)polytropic with n=1.4

A factory generates compressed air from 100 kPa, 17°C by compression to 800 kPa, 500 K, after which it cools in a constant pressure cooler to 300 K, (see Fig. P4.36). Find the specific compressor work and the specific heat transfer in the cooler. 1 2 3 Compressor -w. Compressor section Cooler section

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Number 3

A piston cylinder containes 0.1 kg air at 100 kpa, 126.85 C which goes through a polytropic compression process with n=1.3 to a pressure of 300 kpa. How much work has the air done in the process? I 8 13 !!

3. An adiabatic compressor takes argon from 100 kPa, 300 K to 2000 kPa. The compressor efficiency is 80%. (a) Find the outlet temperature (K) and the work (kJ/kg) (b) Find the entropy generation (kJ/kg-K)