Chapter 6, Problem 6.38CU

Saturated water vapor at 300°F enters a compressor operating at steady state with a mass flow rate of 5 lb/s and is compressed adiabatically to 700 Ibf/in.? If the power input is 2150 hp, determine for the compressor: (a) the percent isentropic compressor efficiency and (b) the rate of entropy production, in hp/°R. Ignore kinetic and potential energy effects.

using rogers and mayhew's table please answer the question

3. A rigid cylinder containing 0.004 m³ of nitrogen at 1 bar and 300 K is heated reversibly until temperature becomes 400 K. Determine: (a) The heat supplied. (b) The entropy change.

A vessel of volume 0.04 m3 contains a mixture of saturated water and steam at a temperatureof 250°C. The mass of the liquid present is 9 kg. Find the pressure, mass, specific volume,enthalpy, entropy and internal energy.

Thermodynamics Two kg of water at 80°C are mixed adiabatically with 3 kg of water at 30°C in a constant pressure process of 1 atmosphere. Find the increase in the entropy of the total mass of water due to the mixing process (Cp of water = 4.187 kJ/kg-K).

Example 1 10 kg of gaseous CO2 contained in a closed system undergoes a reversible at a constant pressure. During this process 42 kJ of internal energy is decreased. Determine the work done during the process, y. Take: Cv= 600 J/kg k, Cp = 840 J/kg k %3D

Define Reversible and Irreversible Processes for entropy ?

Water vapor enters a valve at 0.7 bar, 360oC, and exits at 0.35 bar. If the water vapor undergoes a throttling process (means constant enthalpy & reduce pressure significantly), determine the rate of entropy production within the valve, in kJ/K per kg of water vapor flowing.

Data are provided for steady-state operation of an electric motor in figure below, where hA = 5 W/K.   Determine for the motor the rate of entropy production, in W/K.