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Two kg of air as an ideal gas with constant properties expands inside a piston-cylinder device...
5. Air expands isothermally constant temperature) in a closed, piston-cylinder device. The original state is given...
5. Air expands isothermally constant temperature) in a closed, piston-cylinder device. The original state is given by pı = 20 MPa, T = 1000 K. the process continues until the pressure drops to 2 MPa. The original volume of the air is V1 = 1 m². Determine the following: a. the mass of the air in the system, in kg. b. the final density of the air, in kg/m". Remember, Rair = 0.287 kJ/kg-K c. the final volume of the...
An insulated piston-cylinder device contains 0.1m3 of air (ideal gas) at 400 kPa and 25℃. A...
An insulated piston-cylinder device contains 0.1m3 of air (ideal gas) at 400 kPa and 25℃. A paddle wheel within the cylinder is rotated until 15 kJ of work is done on the air while the pressure is held constant. Assuming the kinetic and potential energies are negligible and the gas constant and specific heat of air are ? = 0.287 kJ kg∙K and ?? = 1.005 kJ kg∙K . Tasks: ( a ) Determine the mass of air inside the...
An air-standard cycle is executed within a closed piston–cylinder system, and it consists of the following...
An air-standard cycle is
executed within a closed piston–cylinder system, and it consists of
the following three processes: 1–2 V = Constant heat addition from
100 kPa and 30°C to 850 kPa 2–3 Isothermal expansion until V3 =
8.5V2 3–1 P = Constant heat rejection to the initial state Assume
air has constant properties with cv = 0.718 kJ/kg·K, cp = 1.005
kJ/kg·K, R = 0.287 kJ/kg·K, and k = 1.4.
Required information An air-standard cycle is executed within a...
Consider a piston cylinder process in air (as an ideal gas with constant specific heats) which...
Consider a piston cylinder process in air (as an ideal gas with constant specific heats) which goes from state 1 at 1 atm, 300 K to state 2 at: 3 atm and 400K. (use k=1.4, Cp = 1.005 kJ/(kg K), Cv=0.718 kJ/(kg K), R= 0.287 kJ/(kg K)) (these are the same conditions as question 4). What must the heat transfer be (in kJ/kg), if the process takes place without entropy generation and it can be assumed the temperature at system...
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.
Air is contained in a piston cylinder device that has a resistance heater inside. The atmosphere...
Air is contained in a piston cylinder device that has a
resistance heater inside. The atmosphere exerts a pressure of 100
kpa on the piston of which it has a mass of 45 kg and a transverse
area of 0.9 m². An electric current passes through the resistance
of the air volume slowly increases by 0.45 m³ while the pressure
remains constant. The mass of the air is 0.27 kg and its specific
internal energy increases 42 kJ / kg,...
The following cycle occurs in a piston-cylinder arrangement. Assume air to be an ideal gas with...
The following cycle occurs in a piston-cylinder arrangement. Assume air to be an ideal gas with constant specific heats. The volumetric compression ratio is 8:1. The efficiency of the Carnot cycle operating between the same limits as this Otto cycle is most nearly 7 3 2 4 air Otto cycle Thigh = 1200°C plow = 100 kPa Rair-0.287 kJ/kg K O (A) 42% (B) 46% O (C) 56% ?(D) 80%
Check my work 6 10 A piston-cylinder device contains 0.63 kg of nitrogen gas at 140...
Check my work 6 10 A piston-cylinder device contains 0.63 kg of nitrogen gas at 140 kPa and 37°C. The gas is now compressed slowly in a polytropic process during which PV1.3 = constant. The process ends when the volume is reduced by one-half. Determine the entropy change of nitrogen during this process. The gas constant of nitrogen is R = 0.2968 kJ/kg.K. The constant volume specific heat of nitrogen at room temperature is cy" 0.743 kJ/kg.K. (Round the final...
2. A piston-cylinder device maintain a constant pressure of 800 kPa while containing 20 kg of...
2. A piston-cylinder device maintain a constant pressure of 800 kPa while containing 20 kg of saturated water vapor. The system is heated with a resistance heater for 10 min at a current of 8 A at the standard wall voltage of 120 V. In that time, 3.2 kJ of heat is lost through the walls. What is the temperature at the heated state? 3 5-18E Hydrogen is contained in a piston-cylinder device at 14.7 psia and 15 ft. At...
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,...
5. Air expands isothermally constant temperature) in a closed, piston-cylinder device. The original state is given by pı = 20 MPa, T = 1000 K. the process continues until the pressure drops to 2 MPa. The original volume of the air is V1 = 1 m². Determine the following: a. the mass of the air in the system, in kg. b. the final density of the air, in kg/m". Remember, Rair = 0.287 kJ/kg-K c. the final volume of the...
An air-standard cycle is
executed within a closed piston–cylinder system, and it consists of
the following three processes: 1–2 V = Constant heat addition from
100 kPa and 30°C to 850 kPa 2–3 Isothermal expansion until V3 =
8.5V2 3–1 P = Constant heat rejection to the initial state Assume
air has constant properties with cv = 0.718 kJ/kg·K, cp = 1.005
kJ/kg·K, R = 0.287 kJ/kg·K, and k = 1.4.
Required information An air-standard cycle is executed within a...
Consider a piston cylinder process in air (as an ideal gas with constant specific heats) which goes from state 1 at 1 atm, 300 K to state 2 at: 3 atm and 400K. (use k=1.4, Cp = 1.005 kJ/(kg K), Cv=0.718 kJ/(kg K), R= 0.287 kJ/(kg K)) (these are the same conditions as question 4). What must the heat transfer be (in kJ/kg), if the process takes place without entropy generation and it can be assumed the temperature at system...
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.
Air is contained in a piston cylinder device that has a
resistance heater inside. The atmosphere exerts a pressure of 100
kpa on the piston of which it has a mass of 45 kg and a transverse
area of 0.9 m². An electric current passes through the resistance
of the air volume slowly increases by 0.45 m³ while the pressure
remains constant. The mass of the air is 0.27 kg and its specific
internal energy increases 42 kJ / kg,...
The following cycle occurs in a piston-cylinder arrangement. Assume air to be an ideal gas with constant specific heats. The volumetric compression ratio is 8:1. The efficiency of the Carnot cycle operating between the same limits as this Otto cycle is most nearly 7 3 2 4 air Otto cycle Thigh = 1200°C plow = 100 kPa Rair-0.287 kJ/kg K O (A) 42% (B) 46% O (C) 56% ?(D) 80%
Check my work 6 10 A piston-cylinder device contains 0.63 kg of nitrogen gas at 140 kPa and 37°C. The gas is now compressed slowly in a polytropic process during which PV1.3 = constant. The process ends when the volume is reduced by one-half. Determine the entropy change of nitrogen during this process. The gas constant of nitrogen is R = 0.2968 kJ/kg.K. The constant volume specific heat of nitrogen at room temperature is cy" 0.743 kJ/kg.K. (Round the final...
2. A piston-cylinder device maintain a constant pressure of 800 kPa while containing 20 kg of saturated water vapor. The system is heated with a resistance heater for 10 min at a current of 8 A at the standard wall voltage of 120 V. In that time, 3.2 kJ of heat is lost through the walls. What is the temperature at the heated state? 3 5-18E Hydrogen is contained in a piston-cylinder device at 14.7 psia and 15 ft. At...
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,...
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