Chapter 7, Problem 7.61P

P.1 ((Application on Reversible process at Constant V and P) Air at 1 bar and 298.15 K (25 °C) is compressed to 5 bar and 298.15 K by two different mechanically reversible processes as follows: (a) Cooling at constant pressure followed by heating at constant volume. (b) Heating at constant volume followed by cooling at constant pressure. Calculate the heat and work requirements, AU, and AH of the air of each path. The following heat capacities for air may be assumed independent of temperature; C, = 20.78 and Cp 29.10 J/mole K. Assume also for air that PV/T is a constant, regardless of the changes it undergoes. At 298.15 K and 1 bar the molar volume of air is 0.02479 m/mole.

Question 17 23 m³/hr of air at 600 kPa, 330 K enters a well-insulated, horizontal pipe having a diameter of 1.2 cm and exits at 120 kPa. Assume steady state and use the ideal gas model for the air. Also assume constant specific heat, c = 1.007 kJ/kg-K for air at 330K. Determine the mass flow rate, in kg/s, and the exit velocity, in m/s. Step 1 Determine the mass flow rate, in kg/s. m₁ = kg/s Step 2 Determine the exit velocity, in m/s. V₂ = > m/s

Refrigerant 134a enters an insulated diffuser as a saturated vapor at 60°F with a velocity of 1200 ft/s. The inlet area is 1.4 in?. At the exit, the pressure is 400 lby/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. Step 1 Determine the mass flow rate, in Ib/s. i Ib/s.

Find the change in entropy when 15 liters of a near ideal gas, argon, at 23°C and 925 mmHg pressure(absolute) are heated in an autoclave to 730°C.A. 2.73 cal/KB. 3.12 cal/KC. 3.55 cal/KD. 4.22 cal/K

The O2 input conditions to a nozzle, which operates in steady state, are 60 bar, 300 K and 1 m/s. The gas expands isentropically at 30 bar. Determine the output speed in m/s. Assume that oxygen is described by the Peng-Robinson equation

Step by step solution please I only have 1 attempt thank you.

Twenty m³/hr of air at 600 kPa, 330 K enters a well-insulated, horizontal pipe having a diameter of 1.2 cm and exits at 120 kPa. Assume steady state and use the ideal gas model for the air. Also assume constant specific heat, cp = 1.007 kJ/kg-K for air at 330 K. Determine the mass flow rate, in kg/s, and the exit velocity, in m/s. Step 1 Your Answer Determine the mass flow rate, in kg/s. mi = Step 2 Correct Answer (Used) 0.0352 * Your answer is incorrect. kg/s Determine the exit velocity, in m/s.

4.1 1 kg of steam at 20 bar, dryness fraction 0.9, is heated reversibly at constant pressure to a temperature of 300°C. Calculate the heat supplied, and the change of entropy, and show the process on a T-s diagram, indicating the area which represents the heat flow. (415 kJ/kg; 0.8173 kJ/kg K) 4.2 Steam at 0.05 bar, 100°C is to be condensed completely by a reversible constant pressure process. Calculate the heat rejected per kilogram of steam, and the change of specific entropy. Sketch the process on a T-s diagram and shade in the area which represents the heat flow. (2550 kJ/kg; 8.292 kJ/kg K) 4.3 0.05 kg of steam at 10 bar, dryness fraction 0.84, is heated reversibly in a rigid vessel until the pressure is 20 bar. Calculate the change of entropy and the heat supplied. Show the area which represents the heat supplied on a T-s diagram. (0.0704 kJ/kg K; 36.85 kJ) 4.4 A rigid cylinder containing 0.006 m' of nitrogen (molar mass 28 kg/kmol) at 1.04 bar, 15°C, is heated reversibly until…

Air enters a compressor operating at steady state at 14 Ibf/in?, 60°F, with a volumetric flow rate of 6400 ft/min. The compression occurs in two stages, with each stage being a polytropic process with n= 1.27. The air is cooled to 80°F between the stages by an intercooler operating at 45 Ibf/in?. Air exits the compressor at 150 Ibf/in?. Step 1 Determine the magnitude of the total power required by the compressor, in Btu/min. W. i Btu/min