Chapter 7, Problem 7.48P

Consider 4.8 pounds per minute of water vapor at 100 lbf/in2, 500oF, and a velocity of 100 ft/s entering a nozzle operating at steady state and expanding adiabatically to the exit, where the pressure is 40 lbf/in2. The isentropic nozzle efficiency is 90.0%.  Determine the velocity of the steam at the exit, in ft/s, and the rate of entropy production, in Btu/min·oR.

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.

Refrigerant 22 is enters a compressor operating at steady state as saturated vapor at 10 bar and compressed adiabatically in an internally reversible process to 16 bar. Ignoring kinetic and potential energy effects, determine the required mass flow rate of refrigerant, in kg/s, if the compressor power input is 6 kW. Show this compression process on a T-s diagram.

0.2 m³ of air at 4 bar and 130 °C is contained in a system. A reversible isothermally expansion takes place till the pressure falls to 1.02 bar. The gas is then heated at constant pressure till Temperature is 144 °C. Calculate: (i) Pressure, Temperature and volume of each state. (ii) The work done. (iii) The net heat supplied. Take cp = 1 kJ/kg K, cv = 0.714 kJ/kg K.

At steady state, air at 148 kPa, 52°C and a mass flow rate of 0.48 kg/s enters an insulated duct having differing inlet and exit cross-sectional areas. At the duct exit, the pressure of the air is 117 kPa, the velocity is 297.09 m/s,the temperature is 82.25°C, and the cross-sectional area is 2 × 10-3 m2. Assuming the ideal gas model, determine the velocity of the air at the inlet, in m/s.

Air is compressed adiabatically in a piston-cylinder assembly from 1 bar, 300 K to 6 bar, 600 K. The air can be modeled as an ideal gas and kinetic and potential energy effects are negligible. Determine the amount of entropy produced, in kJ/K per kg of air, for the compression. What is the minimum theoretical work input, in kJ per kg of air, for an adiabatic compression from the given initial state to a final pressure of 6 bar? Note that work is positive into the compressor. Part A Determine the amount of entropy produced, in kJ/K per kg of air, for the compression. o/m = i kJ/K

A 340 L tank contains steam, initially at 400°C, 3 bar. A valve is opened for 20 seconds and steam flows out of the tank at a constant mass flow rate of 0.005 kg/s. During steam removal, a heater maintains the temperature within the tank constant. Determine final mass remaining in the tank, in kg, and the final pressure in the tank, in bar. Step 1 Determine final mass remaining in the tank, in kg. m₂ = 0.2297 kg Step 2 Determine the final pressure in the tank, in bar. P2= 2.111 x bar

Current Attempt in Progress Water vapor enters a turbine operating at steady state at 500°C, 40 bar, with a velocity of 200 m/s, and expands adiabatically to the exit, where it is saturated vapor at 0.8 bar, with a velocity of 150 m/s and a volumetric flow rate of 15 m³/s. Determine the power developed by the turbine, in kW. Wy eTextbook and Media Save for Later kW A Attempts: unlimited Submit Answer

THERMODYNAMICS - Conservation of Mass UPLOAD AND EXPLAIN COMPLETE SOLUTION. Consider steam that enters a turbine at 70 bar, 530oC with a velocity of 64 m/s. The turbine is operating at steady state conditions and the steam leaves the turbine as a dry saturated vapor at 10 bar. The inlet diameter of the turbine is 0.45 m and the outlet diameter is 3.6 m. Determine the mass flow rate of steam through the turbine.