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5. Determine the change in the entropy of air, in kJ/kg-K, as it undergoes a change...
Calculate the enthalpy change of air, in kJ/kg, if the state changed from 99 kPa and...
Calculate the enthalpy change of air, in kJ/kg, if the state changed from 99 kPa and 35oC to 801 kPa and 419 oC using the equation of state P(v - a) = RT where a = 0.0098 m3/kg, and compare the result to the value obtained by using the ideal gas equation of state. (5 marks
Air in an insulated piston-cylinder assembly undergoes a compression process from 100 kPa, 300 K to...
Air in an insulated piston-cylinder assembly undergoes a compression process from 100 kPa, 300 K to a second state at 600 K and 1 MPa. How much entropy is produced, in kJ/kgK? You can assume that the air is modeled as an ideal gas. Rair 0.287 kJ/kgK
uestion l [use R= 0.287 kJ/kg K, c,-1.0035 kJ/kg K1 a) Air flowing at a rate...
uestion l [use R= 0.287 kJ/kg K, c,-1.0035 kJ/kg K1 a) Air flowing at a rate of 1.6 kg/min is compressed by a 5 kW compressor under steady-state conditions, from 100 kPa and 17°C to 600 kPa and 167°C. During this process, some heat transfer takes place between the compressor and the surrounding medium at 17°C. Determine the rate of entropy change of air during this process, stating clearly any assumptions. (5 Marks)
1)(Hint: Cp=1.005 kJ/kg-K, Cv=0.718 kJ/kg-K, R=0.287 kJ/kg-K). An air-tight room contains 80 kg of air, and...
1)(Hint: Cp=1.005 kJ/kg-K, Cv=0.718 kJ/kg-K, R=0.287 kJ/kg-K). An air-tight room contains 80 kg of air, and a 2-kW baseboard electric resistance heater in the room is turned on and kept on for 15 min. The temperature rise of air at the end of 15 min is 2)An example of when it is appropriate to model a substance as an ideal gas is when a. The pressure and temperature are close to the critcal point b. The pressure and temperature are...
A frictionless piston-cylinder device contains 0.2 kg of air at 100 kPa and 27°C. The air...
A frictionless piston-cylinder device contains 0.2 kg of air at 100 kPa and 27°C. The air is now compressed slowly according to the relation P Vk = constant, where k = 1.4, until it reaches a final temperature of 77°C. Sketch the P-V diagram of the process with respect to the relevant constant temperature lines, and indicate the work done on this diagram. Using the basic definition of boundary work done determine the boundary work done during the process [-7.18...
6.50 m A closed, rigid tank contains 5 kg of air initially at 300 K, 1...
6.50 m A closed, rigid tank contains 5 kg of air initially at 300 K, 1 bar. As illustrated in Fig. P6.50, the tank is in contact with a thermal reservoir at 600 K and heat transfer occurs at the boundary where the temperature is 600 K. A stirring rod transfers 600 kJ of energy to the air. The final temperature is 600 K. The air can be modeled as an ideal gas with cy = 0.733 kJ/kg . K...
6.) A closed, rigid tank contains 5 kg of air initially at 300 K, 1 bar....
6.) A closed, rigid tank contains 5 kg of air initially at 300 K, 1 bar. The diagram below shows a tank in contact with a thermal reservoir at 600 K and heat transfer occurs at the boundary where the temperature is 600 K. A stirring rod transfers 600 kJ of energy to the air. The final temperature is 600 K. The air can be modeled as an ideal gas with c 0.733 k.J/kg K and kinetic and potential energy...
Nitrogen in a piston cylinder device occupies 0.5 m3 at 100 kPa and 20 °C. It undergoes a compres...
Nitrogen in a piston cylinder device occupies 0.5 m3 at 100 kPa and 20 °C. It undergoes a compression process (during which PV1.30-constant) to a final state where the temperature is 200 °C. The specific heats are assumed to be constant while Tsur - 15 C a) Prove that the gas, at state 1, can be treated as an ideal gas. b) Find the pressure and volume at state 2 c) Find the heat transfer, in kJ. d) Find the...
2. (5 Points) 3-kg of air (an ideal gas) is heated in a piston-cylinder device from...
2. (5 Points) 3-kg of air (an ideal gas) is heated in a piston-cylinder device from 17°C to 117°C at a constant pressure of 100 kPa. Determine the entropy change in kJ/K, assuming: a. Constant specific heat. b. Variable specific heat.
5. (a)Consider adiabatic compression of 2 kg of air in a piston-cylinder assembly from 1 bar...
5. (a)Consider adiabatic compression of 2 kg of air in a piston-cylinder assembly from 1 bar and 330 K (State 1) to 14 bar and 700 K (State 2). Air can be considered an ideal gas at these conditions and molecular weight of air is 28.97 kg/kmol. Find the entropy of air in State 1 and State 2. Using the entropy balance equation for a closed system calculate the entropy generation (kJ/K) during the compression process. (b) If entropy decreases...
Air in an insulated piston-cylinder assembly undergoes a compression process from 100 kPa, 300 K to a second state at 600 K and 1 MPa. How much entropy is produced, in kJ/kgK? You can assume that the air is modeled as an ideal gas. Rair 0.287 kJ/kgK
uestion l [use R= 0.287 kJ/kg K, c,-1.0035 kJ/kg K1 a) Air flowing at a rate of 1.6 kg/min is compressed by a 5 kW compressor under steady-state conditions, from 100 kPa and 17°C to 600 kPa and 167°C. During this process, some heat transfer takes place between the compressor and the surrounding medium at 17°C. Determine the rate of entropy change of air during this process, stating clearly any assumptions. (5 Marks)
6.50 m A closed, rigid tank contains 5 kg of air initially at 300 K, 1 bar. As illustrated in Fig. P6.50, the tank is in contact with a thermal reservoir at 600 K and heat transfer occurs at the boundary where the temperature is 600 K. A stirring rod transfers 600 kJ of energy to the air. The final temperature is 600 K. The air can be modeled as an ideal gas with cy = 0.733 kJ/kg . K...
6.) A closed, rigid tank contains 5 kg of air initially at 300 K, 1 bar. The diagram below shows a tank in contact with a thermal reservoir at 600 K and heat transfer occurs at the boundary where the temperature is 600 K. A stirring rod transfers 600 kJ of energy to the air. The final temperature is 600 K. The air can be modeled as an ideal gas with c 0.733 k.J/kg K and kinetic and potential energy...
Nitrogen in a piston cylinder device occupies 0.5 m3 at 100 kPa and 20 °C. It undergoes a compression process (during which PV1.30-constant) to a final state where the temperature is 200 °C. The specific heats are assumed to be constant while Tsur - 15 C a) Prove that the gas, at state 1, can be treated as an ideal gas. b) Find the pressure and volume at state 2 c) Find the heat transfer, in kJ. d) Find the...
2. (5 Points) 3-kg of air (an ideal gas) is heated in a piston-cylinder device from 17°C to 117°C at a constant pressure of 100 kPa. Determine the entropy change in kJ/K, assuming: a. Constant specific heat. b. Variable specific heat.
5. (a)Consider adiabatic compression of 2 kg of air in a piston-cylinder assembly from 1 bar and 330 K (State 1) to 14 bar and 700 K (State 2). Air can be considered an ideal gas at these conditions and molecular weight of air is 28.97 kg/kmol. Find the entropy of air in State 1 and State 2. Using the entropy balance equation for a closed system calculate the entropy generation (kJ/K) during the compression process. (b) If entropy decreases...
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