Refrigerant 22 undergoes a constant-pressure process within a piston-cylinder assembly from saturated vapor at 5.0 bar to a final temperature of 30°C. Kinetic and potential energy effects are negligible. Evaluate the work and the heat transfer, each in kJ per kg of refrigerant.

Refrigerant 22 undergoes a constant-pressure process within a piston-cylinder assembly from saturated vapor at 5.0 bar to a final temperature of 30°C. Kinetic and potential energy effects are negligible. Evaluate the work and the heat transfer, each in kJ per kg of refrigerant.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Refrigerant 22 undergoes a constant-pressure process within a piston–cylinder assembly from saturated vapor at 5.0 bar to a final temperature of 30°C. Kinetic and potential energy effects are negligible.Evaluate the work and the heat transfer, each in kJ per kg of refrigerant.
An ideal gas contained in a piston-and-cylinder device undergoes a thermodynamic cycle made up of three quasi-equilibrium processes. Step 1-2: Adiabatic compression from 330 K and 9.35 atm to 12.58 atm Step 2-3: Isobaric cooling Step 3-1: Isothermal expansion c.) Calculate Q, W, ΔU and ΔH, in J/mole, for each step in the process and for the entire cycle. Assume that CP = (5/2) R. d.) Is this cycle a power cycle or a refrigeration cycle? Explain. Calculate the thermal efficiency or COP of the cycle, whichever is appropriate.
for steam, the specific ideal gas constant = 461.5 J/kg K A closed system is comprised of pure water substance initially at a temperature of 500 oC and a pressure of 20 MPa (state 1). The system undergoes an isochoric process whereby its pressure drops to 0.1 Mpa (state 2). Sketch the process on a Temperature-specific entropy plot, showing the lines of constant pressure which pass through steps 1 and 2.
Q1) Steam at 7 bar and dryness fraction 0.9 expands in a cylinder behind a piston isothermally and reversibly to a pressure of 1.5 bar. Calculate the change of internal energy (u2-u1) and the change of enthalpy (h2-h1) per kg of steam. (Answer: 217.5 kJ/kg and 245.7 kJ/kg ) Note : I don't understand how to interpolate to find u2(internal energy) and h2(enthalpy) . I have found u1= 2385.3 and h2= 2557.3 by using wet vapours formula and read values from saturated side.
for steam, the specific ideal gas constant = 461.5 J/kg K A closed system is comprised of pure water substance initially at a temperature of 500 oC and a pressure of 20 MPa (state 1). The system undergoes an isochoric process whereby its pressure drops to 0.1 Mpa (state 2). Evaluate the specific entropy, specific volume and temperature of the system at state 2.
Refrigerant 134a at p1 = 30 lbf/in2, T1 = 40oF enters a compressor operating at steady state with a mass flow rate of 325 lb/h and exits as saturated vapor at p2 = 160 lbf/in2. Heat transfer occurs from the compressor to its surroundings, which are at T0 = 40oF. Changes in kinetic and potential energy can be ignored. The power input to the compressor is 3.25 hp. Determine the heat transfer rate for the compressor, in Btu/hr, and the entropy production rate for the compressor, in Btu/hr·oR.
Three-tenths kmol of carbon monoxide (CO) in a piston– cylinder assembly undergoes a process from p1 = 150 kPa, T1 = 300 K to p2 = 500 kPa, T2 = 420 K. For the process, W = -300 kJ.Employing the ideal gas model, determine:(a) the heat transfer, in kJ.(b) the change in entropy, in kJ/K.
1.5 kg of water is in saturated liquid state at 2 bar (vf = 0.001061 m3/kg, uf = 504.0 kJ/kg, hf = 505 kJ/kg). Heat is added in a constant pressure process till the temperature of water reaches 400°C (v = 1.5493 m3/kg, u = 2967.0 kJ/kg, h = 3277.0 kJ/kg).Marks(i) Draw the pv diagram(ii) Estimate The heat added (in kJ) in the process
A quantity of a certain perfect gas is compressed from an initial state of 0.085 m3 , 1 bar to a final state of 0.034 m3 , 3.9 bar. The specific heat at constant volume is 0.724 kJ/kg K, and the specific heat at constant pressure is 1.020 kJ/kg K. The observed temperature is 146 K. Determine the specific gas constant, R, The mass of the gas present, and the increase of internal energy of the gas.
One kilogram of air, initially at 5 bar, 350 K, and 3 kg of carbon dioxide (CO2), initially at 2 bar, 450 K, are confined to opposite sides of a rigid, well-insulated container. The partition is free to move and allows conduction from one gas to the other without energy storage in the partition itself. The air and carbon dioxide each behave as ideal gases. Determine the final equilibrium temperature, in K, and the final pressure, in bar, assuming constant specific heats.
A piston cylinder device with stops as shown contains water initially at 25 oC and 100 kPa “State 1”. Heat is then added, and piston moves till it hits the stops where cylinder contains two phase mixture with quality x2 = 0.616 “State 2”. Heating continues until final Pressure is 300 kPa “State 3”. 1) What is the final specific volume (m3/kg)? 1.2217 Not listed 1.1202 1.0440 0.9864 1.0551 2) What is the boundary work (kJ/kg)? 122.07 98.54 Not listed 104.30 116.85 111.92 3) What is the final Temperature (oC)? 457.1 371.1 441.6 408.0 Not listed 522.6
Oxygen gas initially at 355 K and 1.50 bar undergoes the following cyclic processes in a closed system:Step 1: Adiabatic compression to 7.50 barStep 2: Addition of 13 240.0 J/mol of heat to raise the temperature at constant pressureStep 3: Adiabatic expansion to 1.50 barStep 4: Isobaric cooling back to original state.Determine ΔU, ΔH, Q and W for each step, and for the overall reversible process. Express all answers in kJ/mol and up to decimal places