A gas undergoes a process from state 1, where p1 = 60 lbf/in.2, v1 = 6.0...
A gas undergoes a process from state 1, where p1 = 60 lbf/in.2, v1 = 6.0 ft3/lb, to state 2 where p2 = 85.1 lbf/in.2, according to pv1.3 = constant. The relationship between pressure, specific volume, and internal energy is u = (0.2651)pv - 95.436 where p is in lbf/in.2, v is in ft3/lb, and u is in Btu/lb. The mass of gas is 10 lb. Neglecting kinetic and potential energy effects, determine the heat transfer, in Btu. Entry field with incorrect answer now contains modified data Btu
Homework Answers
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A gas undergoes a process from state 1, where p1 = 60 lbf/in.2,
v1 = 6.0...
A gas undergoes a process in a piston–cylinder assembly during which the pressure-specific volume relation is...
A gas undergoes a process in a piston–cylinder assembly during which the pressure-specific volume relation is pv1.1 = constant. The mass of the gas is 0.4 lb and the following data are known: p1 = 160 lbf/in.2, V1 = 1 ft3, and p2 = 390 lbf/in.2 During the process, heat transfer from the gas is 2.1 Btu. Kinetic and potential energy effects are negligible. Determine the change in specific internal energy of the gas, in Btu/lb.
Problem # 2 135 Points Polytropic Processes A piston-cylinder undergoes a constant pressure expansion process followed...
Problem # 2 135 Points Polytropic Processes A piston-cylinder undergoes a constant pressure expansion process followed by an adiabatic compression. The adiabatic compression can be modeled as a polytropic process PVn constant with a volume exponent n 1.4. At state 1 the pressure of the system is P1 60 psi, the volume is Vi 8.868 ft3 and the internal energy U 1630.6 BTU. The work output during the constant pressure process is W2-75.2 BTU and the heat transfer input for...
Problem 4.029 Air expands through a turbine operating at steady state. At the inlet, P1 =...
Problem 4.029 Air expands through a turbine operating at steady state. At the inlet, P1 = 150 lbf/in.2, T1 = 1400ºR, and at the exit, P2 = 14.8 lbf/in., T2 = 700°R. The mass flow rate of air entering the turbine is 5 lb/s, and 65,000 Btu/h of energy is rejected by heat transfer. Neglecting kinetic and potential energy effects, determine the power developed, in hp. hp We = the tolerance is +/-2%
A cylinder-piston sistem contains CO2. The sistem experiments an initial expansion where P1 = 20 lbf...
A cylinder-piston sistem contains CO2. The sistem experiments an initial expansion where P1 = 20 lbf / in2 and V1 = 0.50 ft3 till the final state where P2= 5 lbf / in2 and V2= 2.50 ft3. The relation between pressure and volumen during the process is P = A + BV, where A and B are constants. a) For the CO2, evaluate the work done on ft / lbf and Btu b) Calculate the values of A and B...
Argon is contained within a piston-cylinder assembly with initial state of V1 25 ft3 significant change...
Argon is contained within a piston-cylinder assembly with initial state of V1 25 ft3 significant change in kinetic or potential energy, undergoes a thermodynamic cycle consisting of three processes as follows: Process 1-2: Adiabatic expansion with P aV + c, where c- 15 in Hg, a constant, and V2 40 ft3 p1 70 in Hg, and with no Process 2-3: Compression with pV-constant, U2 U3. Process 3-1: Constant-volume with AU-0.5 BTU 1. For process 1-2, find the constant a (with...
At steady state, 1.8 lb/s of hot gaseous products of combustion cool from p1 = 18.0...
At steady state, 1.8 lb/s of hot gaseous products of combustion cool from p1 = 18.0 lbf/in2, T1 = 2400°F to p2 = 16.0 lbf/in2, T2 = 260°F as they flow through a pipe. Heat transfer from the gas occurs at a boundary temperature of Tb = 230°F. Use the ideal gas model with Cp = 0.25 Btu/lb.°R and an average molecular weight, M = 27.5 lb/lbmol. Let To = 60°F and ignore the effects of motion and gravity. Determine...
Ammonia is contained in a piston-cylinder assembly. The ammonia undergoes a reversible, isobaric process from an...
Ammonia is contained in a piston-cylinder assembly. The ammonia undergoes a reversible, isobaric process from an initial pressure of 30 lbf/in2 and volume of 4 ft3/lb to a final temperature of 70° F. The mass of ammonia is 0.35 lb. Determine the amount of work done on the ammonia in Btu, the amount of heat transfer to the ammonia in Btu, and the temperature at which the heat transfer occurs in °F. Assume that the heat transfer occurs at a...
Propane is compressed from an initial state with a pressure of 100 lbf/in2 and a quality...
Propane is compressed from an initial state with a pressure of 100 lbf/in2 and a quality of 0.40 to a final saturated liquid state with a temperature is 50°F. Is it possible for this process to occur adiabatically? Justify your answer. Air is contained in a rigid, well-insulated container of volume 3 m3. The air undergoes a process from an initial state with a pressure of 200 kPa and temperature of 300 K. During the process, the air receives 720...
A piston-cylinder assembly contains 0.7 lb of propane. The propane expands from an initial state where...
A piston-cylinder assembly contains 0.7 lb of propane. The propane expands from an initial state where p1 = 60 lbf/in.and T1 = 90°F to a final state where P2 = 10 lbf/in. During the process, the pressure and specific volume are related by pr2 = constant. Determine the energy transfer by work, in Btu. W = Btu the tolerance is +/-2%
A gas contained within a pistoncylinder assembly undergoes two processes, A and B, between the same...
A gas contained within a pistoncylinder assembly undergoes two processes, A and B, between the same end states, 1 and 2, where p1 = 10 bar, V1 = 0.1m3 , U1 = 400kJ and p2 = 1 bar, V2 = 1.0m3 , U2 = 200kJ: (a) Process A: Process from 1 to 2 during which the pressure volume relation is pV = constant. (b) Process B: Constant-volume process from state 1 to a pressure of 2 bar, followed by a...
Problem # 2 135 Points Polytropic Processes A piston-cylinder undergoes a constant pressure expansion process followed by an adiabatic compression. The adiabatic compression can be modeled as a polytropic process PVn constant with a volume exponent n 1.4. At state 1 the pressure of the system is P1 60 psi, the volume is Vi 8.868 ft3 and the internal energy U 1630.6 BTU. The work output during the constant pressure process is W2-75.2 BTU and the heat transfer input for...
Problem 4.029 Air expands through a turbine operating at steady state. At the inlet, P1 = 150 lbf/in.2, T1 = 1400ºR, and at the exit, P2 = 14.8 lbf/in., T2 = 700°R. The mass flow rate of air entering the turbine is 5 lb/s, and 65,000 Btu/h of energy is rejected by heat transfer. Neglecting kinetic and potential energy effects, determine the power developed, in hp. hp We = the tolerance is +/-2%
Argon is contained within a piston-cylinder assembly with initial state of V1 25 ft3 significant change in kinetic or potential energy, undergoes a thermodynamic cycle consisting of three processes as follows: Process 1-2: Adiabatic expansion with P aV + c, where c- 15 in Hg, a constant, and V2 40 ft3 p1 70 in Hg, and with no Process 2-3: Compression with pV-constant, U2 U3. Process 3-1: Constant-volume with AU-0.5 BTU 1. For process 1-2, find the constant a (with...
A piston-cylinder assembly contains 0.7 lb of propane. The propane expands from an initial state where p1 = 60 lbf/in.and T1 = 90°F to a final state where P2 = 10 lbf/in. During the process, the pressure and specific volume are related by pr2 = constant. Determine the energy transfer by work, in Btu. W = Btu the tolerance is +/-2%
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