Chapter 7, Problem 7.37P

Assuming the ideal gas model for the air and ignoring heat transfer, determine the temperature, in °R, and pressure, in lbf/in.2, at the exit.

7.36 At steady state, hot gaseous products of combustion from a gas turbine cool from 3000°F to 250°F as they flow through a pipe. Owing to negligible fluid friction, the flow occurs at nearly constant pressure. Applying the ideal gas model with ₂ = 0.3 Btu/lb/ºR, determine the exergy transfer accompanying heat transfer from the gas, in Btu per lb of gas flowing. Let T. = 80°F and ignore the effects of motion and gravity. -568.43

Determine the change in exergy in kJ for each of the following processes in the system with 1 kg of steam at 20 bar and 240 °C initially. a) In case the system is heated to double its volume at constant pressure. b) In case of expansion by doubling the system volume isothermally. dead state; T0=20 °C, P0=1 bar

Determine the exergy, in Btu, of one pound mass of: a) saturated liquid Refrigerant 134a at -5°F b) saturated vapor Refrigerant 134a at 140°F c) Refrigerant 134a at 60°F, 20lbf/in.2 d) Refrigerant 134a at 60°F, 10lbf/in.2 In each case, consider a fixed mass at rest and zero elevation relative to an exergy refernce environment for which To=60°F, Po=15 lbf/in.2

Air enters a diffuser operating at steady state at 750°R, 15 lbf/in.2, with a velocity of 600 ft/s, and exits with a velocity of 60 ft/s. The ratio of the exit area to the inlet area is 10.Assuming the ideal gas model for the air and ignoring heat transfer, determine the temperature, in °R, and pressure, in lbf/in.2, at the exit.

X Your answer is incorrect. Steam enters a well-insulated turbine operating at steady state at 4 MPa with a specific enthalpy of 3015.4 kJ/kg and a velocity of 10 m/s. The steam expands to the turbine exit where the pressure is 0.07 MPa, specific enthalpy is 2431.7 kJ/kg, and the velocity is 90 m/s. The mass flow rate is 11.95 kg/s. Neglecting potential energy effects, determine the power developed by the turbine, in kW. 3004.4 kW

Refrigerant 134a enters a well-insulated nozzle at 200 lbf/in.?, 140°F, with a velocity of 120 ft/s and exits at 10 lbf/in.? with a velocity of 1500 ft/s. For steady-state operation, and neglecting potential energy effects, determine the temperature, in °F, and the quality of the refrigerant at the exit. T = i °F X2 =

Which of the following statements best describes the 2nd law of thermodynamics? The total entropy of a a reservoir must stay the same or increase. The change in internal energy for an ideal gas is given as A U=mc _▲T. V Heat energy will always be transferred from a hotter object to a colder object. Around a complete cycle, the net heat and net work additions must sum to zero. O A reversible cyclic engine can convert all the heat input it receives into useful work output.

Need Help going through the process on how to solve this problem. May accidentally be asking this a second time, because the first time I asked it, it didn't show as a pending problem. Steam expands adiabatically through a turbine at steady state. The entering stream is at 750 lbf/in^2, 750°F, and the exiting stream is a saturated vapor at 10 lbf/in^2. Kinetic and potential energy effects are negligible. a. How much work per lb of flow does the turbine produce, in Btu/lbm? b. If the turbine produces 3000 kW of output power, determine the mass flow rate of steam in kg/s. c. If this process were isentropic, the existing stream would no longer be a saturated vapor. Determine the final quality of steam in that case. d. Determine the isentropic turbine efficiency.