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
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Calculate the enthalpy change of air, in kJ/kg, if the state
changed from 99 kPa and...
5. Determine the change in the entropy of air, in kJ/kg-K, as it undergoes a change...
5. Determine the change in the entropy of air, in kJ/kg-K, as it undergoes a change of state from 100 kPa and 20 C to 600 kPa and 300C using the equation of state P(V-a) -RT where a 0.01 m/kg, and compare the result to the value obtained by using the ideal gas equation of state.
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...
0.20 kg of air at pressure of 113 kPa occupies 0.18 m3 and from this condition...
0.20 kg of air at pressure of 113 kPa occupies 0.18 m3 and from this condition it is compressed to 1237 kPa accordingly to the law P*(V)1.28 = constant. Determine change of internal energy of the air in kJ, Cp=1.005 kJ/kg K Cv=0.718kJ/kg K R=0.287 kJ/kg K
A 2.2-m3 rigid tank initially contains air at 100 kPa and 22°C. The tank is connected...
A 2.2-m3 rigid tank initially contains air at 100 kPa and 22°C. The tank is connected to a supply line through a valve. Air is flowing in the supply line at 600 kPa and 22°C. The valve is opened, and air is allowed to enter the tank until the pressure in the tank reaches the line pressure, at which point the valve is closed. A thermometer placed in the tank indicates that the air temperature at the final state is...
100 kg/hr of air is compressed from 110 kPa and 255 K (where it has an...
100 kg/hr of air is compressed from 110 kPa and 255 K (where it has an enthalpy of 489 kJ/kg) to 1000 kPa and 278 K (where it has an enthalpy of 509 kJ/kg). The exit velocity of the air from the compressor is 60 m/s. The inlet velocity is very small and can be neglected. The process is adiabatic and there is no change in height during the process. a) Label all known information on the diagram. State if...
7. An industrial turbine process requires a steady 0.5 kg/s of air at 200 kPa. This air is to be the exhaust from a...
7. An industrial turbine process requires a steady 0.5 kg/s of air at 200 kPa. This air is to be the exhaust from a specially designed turbine with inlet state 400 kPa, 400 K. The heat transfer could be obtained from a source at 500 K if necessary. This process may be assumed to be reversible and the changes in kinetic and potential energy are negligible. Air is an ideal gas, with constant specific heats, using Table A.S (a) Which...
Moist air is at 80F (26.67C) dry-bulb, 0.0150 lb-w/lb-da (0.0150 kg-w/kg-da) humidity ratio, pressure of 14.696...
Moist air is at 80F (26.67C) dry-bulb, 0.0150 lb-w/lb-da (0.0150 kg-w/kg-da) humidity ratio, pressure of 14.696 psia (101.35 kPa). Determine the dew-point temperature, relative humidity, volume in cu ft/lb-da (cu meters/kg-da), and enthalpy in Btu/lb-da (kJ/kg-da) using the moist air property tables and the ideal gas equations. What error is incurred using the ideal gas approach? Compare these results with the psychrometric charts (available in ASHRAE Fundamentals)
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...
7. Steam leaves an industrial boiler at 827.4kPa and 171.6°C (hf = 727.25 kJ/kg, hfg =...
7. Steam leaves an industrial boiler at 827.4kPa and 171.6°C (hf = 727.25 kJ/kg, hfg = 2043.2 kJ/kg ). A portion of the steam is passed through a throttling calorimeter and is exhausted to the atmosphere when the calorimeter pressure is 101.4 kPa and a temperature of 115.6°C (h= 2707.6 kJ/kg ). How much moisture does the steam leaving the boiler contain ? 8. During the polytropic process of an ideal gas, the state changes from 138 kPa and 5°C...
Calculate the change in enthalpy as 1 Kg of nitrogen is heated from 1000 K to...
Calculate the change in enthalpy as 1 Kg of nitrogen is heated from 1000 K to 1500 K, assuming the nitrogen is an ideal gas at a constant pressure. The temperature-dependent specific heat of nitrogen is: Cp = 39.06 - 512.79T^-1.5 + 1072.7T^-2 - 820.4T^-3, Cp is in kJ /kmole· K, and T is in K. a) 600 kJ b) 700 kJ c) 900 kJ d) 800 kJ e) 1000 kJ
5. Determine the change in the entropy of air, in kJ/kg-K, as it undergoes a change of state from 100 kPa and 20 C to 600 kPa and 300C using the equation of state P(V-a) -RT where a 0.01 m/kg, and compare the result to the value obtained by using the ideal gas equation of state.
A 2.2-m3 rigid tank initially contains air at 100 kPa and 22°C. The tank is connected to a supply line through a valve. Air is flowing in the supply line at 600 kPa and 22°C. The valve is opened, and air is allowed to enter the tank until the pressure in the tank reaches the line pressure, at which point the valve is closed. A thermometer placed in the tank indicates that the air temperature at the final state is...
7. An industrial turbine process requires a steady 0.5 kg/s of air at 200 kPa. This air is to be the exhaust from a specially designed turbine with inlet state 400 kPa, 400 K. The heat transfer could be obtained from a source at 500 K if necessary. This process may be assumed to be reversible and the changes in kinetic and potential energy are negligible. Air is an ideal gas, with constant specific heats, using Table A.S (a) Which...
7. Steam leaves an industrial boiler at 827.4kPa and 171.6°C (hf = 727.25 kJ/kg, hfg = 2043.2 kJ/kg ). A portion of the steam is passed through a throttling calorimeter and is exhausted to the atmosphere when the calorimeter pressure is 101.4 kPa and a temperature of 115.6°C (h= 2707.6 kJ/kg ). How much moisture does the steam leaving the boiler contain ? 8. During the polytropic process of an ideal gas, the state changes from 138 kPa and 5°C...
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