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1. Question 4-7 from Thermodynamics ed. 7: A piston- cylinder device initially contains 0.07 m' of...
A piston-cylinder device initially contains 0.07 m3 of nitrogen gas at 130 kPa and 120 degrees...
A piston-cylinder device initially contains 0.07 m3 of nitrogen gas at 130 kPa and 120 degrees celcius. The nitrogen is now expanded polytropically to a state of 100 kPa and 100 degrees celcius. Determine the boundary work done during this process. Step by step solutions with basic explanations
(6). (12 points) A piston-cylinder device contains 0.25 kg of air initially at 1.8 MPa and...
(6). (12 points) A piston-cylinder device contains 0.25 kg of
air initially at 1.8 MPa and 360 °C. The air is first expanded
isothermally to 400 kPa, then compressed polytropically, with a
polytropic exponent of 1.2 to the initial pressure, and finally
compressed at the constant pressure to the initial state. Pease
find: (a) (3p) The boundary work for the isothermal expansion
process. (b) (3p) The boundary work for the polytropic compression
process. (c) (3p)The boundary work for the constant...
A piston-cylinder device contains 1.15 kg of air initially at 2441 kPa and 379 oC. The...
A piston-cylinder device contains 1.15 kg of air initially at 2441 kPa and 379 oC. The air is first expanded isothermally to 470 kPa, then compressed polytropically with a polytropic exponent of 1.7 to the initial pressure, and finally compressed at the constant pressure to the initial state. Determine the net work of the cycle Net work kJ A pistoo-cylinder deuice contains 0.45 kg ofair ity at 2°us kPa and 318 c. The air is first expanded iiethermally to 465kfe,...
(20 points) A piston cylinder device contains 3kg of nitrogen initially at 250k Pa and 50C....
(20 points) A piston cylinder device contains 3kg of nitrogen initially at 250k Pa and 50C. The nitrogen is now compressed slowly in a polytropic process during which PV1.3= constant until the volume is reduced by one half. Determine the work done and the heat transfer for this process. Use R=0.298kJ/kgK and c = 0.744k.J/kgK
A piston cylinder device contains air with a volume of 0.05 m3 at 25oC and 100...
A piston cylinder device contains air with a volume of 0.05 m3 at 25oC and 100 kPa pressure. The gas is now compressed to a final temperature of 95oC at 250 kPa. This compression is polytropic and follows PVn=constant. a. Determine how much boundary work was added to the gas [in kJ] b. How much heat was added or removed from this system during this process? [in kJ]
Problem 2 A spring-loaded piston-cylinder device contains 1 kg of carbon dioxide that is initially at...
Problem 2 A spring-loaded piston-cylinder device contains 1 kg of carbon dioxide that is initially at 100 kPa and 25°C (State 1). Heat is added until the gas reaches 800°C, at which point the pressure is 300 kPa (State 2) (a) Determine the boundary work (kJ) done by the CO2. Assume the spring is linear. (b) Determine the amount of heat transfer (kJ) into the CO2. Data for CO2: R = 0.1889 kJ/(kg K), Cpo = 0.846 kJ/(kg K), Cvo...
(10 ponts) A piston-cylinder that has a piston initially resting on top of a set of...
(10 ponts) A piston-cylinder that has a piston initially resting on top of a set of stops initially contains 0.35 kg of hellum gas at 100 kPa and 16.8 C. A pressure of 171 kPa is required to lift the piston off the stops. Helium a) At what temperature will the piston begin to move? b) How much heat must be added before the piston starts to rise? c) If the volume of the gas inside the cylinder increases by...
4). A piston cylinder device whose piston is resting on a set of stops contains 2kg...
4). A piston cylinder device whose piston is resting on a set of stops contains 2kg of Helium initially at 27°C and 100 kPa. The mass of the piston plus the atmospheric pressure effects is such that 500 kPa of gas pressure is required to raise it. Determine how much heat must be transferred to the helium to start raising? For He: R 2.0769 J/kg K C,-3.1156 kJkgK C,-5.1926 kJkg.K
3. A piston-cylinder device initially contains 3 kg saturated liquid water at 500 kPa. Now heat...
3. A piston-cylinder device initially contains 3 kg saturated liquid water at 500 kPa. Now heat is transferred to the water until the cylinder contains saturated vapor only. Determine water m = 3 kg p = 500 kPa a) The initial and final volume of the cylinder, b) The boundary work of the piston, and c) The heat added to the system
Problem 7-173- A piston–cylinder device contains air that undergoes a reversible thermodynamic cycle. Initially, air is...
Problem 7-173- A piston–cylinder device contains air that undergoes a reversible thermodynamic cycle. Initially, air is at 400 kPa and 300 K with a volume of 0.3 m3. Air is first expanded isothermally to 150 kPa, then compressed adiabatically to the initial pressure, and finally compressed at the constant pressure to the initial state. Accounting for the variation of specific heats with temperature, determine the work and heat transfer for each process.
(6). (12 points) A piston-cylinder device contains 0.25 kg of
air initially at 1.8 MPa and 360 °C. The air is first expanded
isothermally to 400 kPa, then compressed polytropically, with a
polytropic exponent of 1.2 to the initial pressure, and finally
compressed at the constant pressure to the initial state. Pease
find: (a) (3p) The boundary work for the isothermal expansion
process. (b) (3p) The boundary work for the polytropic compression
process. (c) (3p)The boundary work for the constant...
A piston-cylinder device contains 1.15 kg of air initially at 2441 kPa and 379 oC. The air is first expanded isothermally to 470 kPa, then compressed polytropically with a polytropic exponent of 1.7 to the initial pressure, and finally compressed at the constant pressure to the initial state. Determine the net work of the cycle Net work kJ A pistoo-cylinder deuice contains 0.45 kg ofair ity at 2°us kPa and 318 c. The air is first expanded iiethermally to 465kfe,...
(20 points) A piston cylinder device contains 3kg of nitrogen initially at 250k Pa and 50C. The nitrogen is now compressed slowly in a polytropic process during which PV1.3= constant until the volume is reduced by one half. Determine the work done and the heat transfer for this process. Use R=0.298kJ/kgK and c = 0.744k.J/kgK
Problem 2 A spring-loaded piston-cylinder device contains 1 kg of carbon dioxide that is initially at 100 kPa and 25°C (State 1). Heat is added until the gas reaches 800°C, at which point the pressure is 300 kPa (State 2) (a) Determine the boundary work (kJ) done by the CO2. Assume the spring is linear. (b) Determine the amount of heat transfer (kJ) into the CO2. Data for CO2: R = 0.1889 kJ/(kg K), Cpo = 0.846 kJ/(kg K), Cvo...
(10 ponts) A piston-cylinder that has a piston initially resting on top of a set of stops initially contains 0.35 kg of hellum gas at 100 kPa and 16.8 C. A pressure of 171 kPa is required to lift the piston off the stops. Helium a) At what temperature will the piston begin to move? b) How much heat must be added before the piston starts to rise? c) If the volume of the gas inside the cylinder increases by...
4). A piston cylinder device whose piston is resting on a set of stops contains 2kg of Helium initially at 27°C and 100 kPa. The mass of the piston plus the atmospheric pressure effects is such that 500 kPa of gas pressure is required to raise it. Determine how much heat must be transferred to the helium to start raising? For He: R 2.0769 J/kg K C,-3.1156 kJkgK C,-5.1926 kJkg.K
3. A piston-cylinder device initially contains 3 kg saturated liquid water at 500 kPa. Now heat is transferred to the water until the cylinder contains saturated vapor only. Determine water m = 3 kg p = 500 kPa a) The initial and final volume of the cylinder, b) The boundary work of the piston, and c) The heat added to the system
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