Chapter 6, Problem 6.117P

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Air at 1bar, 290K enters a compressor operating at steady state and is compressed adiabatically to 3bar. The isentropic compressor efficiency is 80%. ignore kinetic and potential energy effects. Air can be modeled as ideal gas and k can be chosen as 1.4, determine for the compressor (a) the power input, in kJ/kg of air flowing. 134.26 (b) the amount of entropy produced, in kJ/kg-K of air flowing. 0.06564

Air with a mass flow rate of 3 kg/s enters a horizontal nozzle operating at steady state at 400 K, 300 kPa, and velocity of 2.5 m/s. At the exit, the temperature is 250 K and the velocity is 400 m/s. Using the ideal gas model for air with constant cp = 1.011 kJ/kg · K, determine a. the area at the inlet, in m2. b. the heat transfer between the nozzle at its surroundings, in kW. Specify whether the heat transfer is to or from the air.

6.72 WP Figure P6.72 shows data for a portion of the ducting in a ventilation system operating at steady state. The ducts are well in- sulated and the pressure is very nearly 1 atm throughout. Assuming the ideal gas model for air with c, = 0.24 Btu/lb · °R, and ignoring kinetic and potential energy effects, determine (a) the temperature of the air at the exit, in °F, (b) the exit diameter, in ft, and (c) the rate of entropy production within the duct, in Btu/min· °R. %3D D = 4 ft V = 400 f/min T = 80°F page2 3 V= 400 ft/min T3 = ? D3 = ? Insulation = 2000 ft/min (AV)2 V2 = 600 f/min T2 = 40°F

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Refrigerant 134a enters an insulated diffuser as a saturated vapor at 80 deg F with a velocity of 800 ft/s. The inlet area is 1.4 in^2. At the exit, the pressure is 400 lbf/in2 and the velocity is negligible. The diffuser operates at steady state and potential energy effects can be neglected. Determine the mass flow rate, in lb/s, and the exit temperature, in deg F.

A turbine operating under steady-flow conditions receives steam at the following state; pssure,100 bar; specific internal energy 2773 kJ/kg, velocity 30 m/s. the state of steam leaving the turbine is as follow: pressure 1 bar, specific internal energy 2450 kJ/kg, velocity 90 m/s. Heat is rejected to the surroundings at the rate of 0.25 kW and the rate of steam flow through the turbine is 0.4 kg/s calculate the power developed by the .turbine

A well-insulated turbine operating at steady state develops 30 MW of power for a steam flow rate of 50 kg/s. The steam enters at 25 bar with a velocity of 61 m/s and exits as saturated vapor at 0.06 bar with a velocity of 130 m/s. Neglecting potential energy effects, determine the inlet temperature, in °c. T1 = i °C

Thermodynamics, please show all work thank you.