Chapter 6, Problem 6.76P

Water vapors at 40 bar enters a pipe fitting (adapter) with a velocity of 169 m/s and exits thefitting at 10 bar and 572°F. If the temperature at the inlet is 1004°F., calculate the exit velocity.The system is assumed to be at steady state.

Refrigerant 134a enters an insulated diffuser as a saturated vapor at 120°F with a velocity of 1200 ft/s. The inlet area is 1.4 in?. At the exit, the pressure is 400 Ibf/in? and the velocity is negligible. The diffuser operates at steady state and potential energy effects can be neglected. Determine the mass flow rate, in Ib/s, and the exit temperature, in °F.

Q1: An air receiver contains air at 16 bar and 42°C. A valve is opened and some air is allowed to blow out to atmosphere. The pressure of the air in the receiver drops rapidly to 12 bar when the valve is then closed. Assuming that the mass in the receiver undergoes a reversible adiabatic process, calculate the initial and final mass of air if you know that the amount of air which has left the receiver is 18.04 kgs.

Water contained in a closed, rigid tank, initially at 100 lbę/in?, 800°F, is cooled to a final state where the pressure is 40 Ib;/in?. Determine the quality at the final state and the change in specific entropy, in Btu/lb•°R, for the process.

T-4

= 71°C with v₁ = 0.201 m³/kg. The gas v1 A piston-cylinder assembly holds 1.2 kg of air initially at T₁ undergoes a process as an ideal gas and reaches a final state at T2 = 149° C with v2 = Determine the change in entropy AS in kJ/K. Assume c = 0.72 kJ/kg. K. 0.725 m³/kg. (a) AS = Ex: 0.888 kJ/K (b) Is the process adiabatic? Pick (c) What is the direction of heat transfer? Pick Air

Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 24°C and exits at 1.0 bar. The refrigerant undergoes a throttling process. Determine the temperature, in °C, and the quality of the refrigerant at the exit of the expansion valve. a. Determine the temperature of the refrigerant at the exit, in °C. b. Determine the quality of the refrigerant at the exit of the expansion valve. th pi=10 bar T₁=24°C 2. Expansion valve -p2=1.0 bar

Argon gas flows through a well-insulated nozzle at steady state. The temperature and velocity at the inlet are 550°R and 150 ft/s, respectively. At the exit, the temperature is 480°R and the pressure is 40 lb/in?. The area of the exit is 0.0085 ft². Use the ideal gas model with k-1.67, and neglect potential energy effects. Determine the velocity at the exit, in ft/s, and the mass flow rate, in lb/s. Step 1 Your answer is correct Determine the velocity at the exit, in ft/s. V₂- 677.088 Hint Step 2 ft/s Determine the mass flow rate, in lb/s, through the nozzle. m = i lb/s Attempts: 2 of 4 used

An ideal gas undergoes a process from state 1 ( the properties are T₁ = 300 K, p₁ = 100 kPa) to state 2 (the properties are T₂ = 600 K, p₂ = 500 kPa). The specific heats of the ideal gas are: c = 1 kJ/kg-K and c = 0.7 kJ/kg-K.. The change in specific entropy of the ideal gas to two decimal places)from state 1 to state 2 (in kJ/kg-K) is......