Q7) A piston/cylinder arrangement, contains air at 250 kPa, 300°C. The 50-kg piston has a diameter of 0.1 m and initially pushes against the stops. The atmosphere is at 100 kPa and 20°C. The cylinder now cools as heat is transferred to the ambient. 25 cm a. At what temperature does the piston begin to move down? b. How far has the piston dropped when the temperature reaches ambient?

Q7) A piston/cylinder arrangement, contains air at 250 kPa, 300°C. The 50-kg piston has a diameter of 0.1 m and initially pushes against the stops. The atmosphere is at 100 kPa and 20°C. The cylinder now cools as heat is transferred to the ambient. 25 cm a. At what temperature does the piston begin to move down? b. How far has the piston dropped when the temperature reaches ambient?

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter2: Matter And Energy

Section: Chapter Questions

Problem 30RQ: A gas is compressed inside a compressor's cylinder. When the piston is at its bottom dead center,...

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Po Q7) A piston/cylinder arrangement, contains air at 250 kPa, 300°C. The 50-kg piston has a diameter of 0.1 m and initially pushes against the stops. The atmosphere is at 100 kPa and 20°C. The cylinder now cools as heat is transferred to the ambient. Alr 25 cm a. At what temperature does the piston begin to move down? b. How far has the piston dropped when the temperature reaches ambient?
Q2: A piston/cylinder initially contains air at 150 kPa, 400°C. The setup is allowed to cool to the ambient temperature of 20°C. a. Draw the process on P-V diagram ? b. What is the final pressure in the cylinder? c. What is the specific work done by the air during this process? Assume V₂= 0.5 V₁, R=0.287 KJ/kg.K ark)
M 1::YY docs.google.com/forms الشعبة * Q A piston'cylinder arrangement, contains oxygen at 200 kPa, 350°C. The 40-kg piston has a diameter of 0.2 m and initially pushes against the stops. The atmosphere is at 100 kPa and 20C. The cylinder now cools as heat is transferred to the ambient. a. At what temperature does the piston begin to move down? b. How far has the piston dropped when the temperature reaches ambient? e. Draw P-v diagram II
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Q/ A piston'cylinder arrangement, contains CO2 at 200 kPa. 350°C. The 40-kg piston has a diameter of 0.2 m and initially pushes against the stops. The atmosphere is at 100 kPa and 20°C. The cylinder now cools as heat is transferred to the ambient. a. At what temperature does the piston begin to move down? b. How far has the piston dropped when the temperature reaches ambient? c. Draw P-v diagram CO 20 on
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20. A tank contains 5kg of an ideal gas at 8atm and 60°C. A valve is opened and the mass of the gas is allowed to escape. If the final pressure in the tank is 3.4atm. What is the final temperature in the tank? a. -131.5613°C b. -119.0681°C c. -118.7652°C d. -114.9056°C
Refrigerant-134a is in an insulated canister with temperature 25 C. There is a partition in the canister so the refrigerant is a saturated liquid and takes up 1/100 of the volume of the canister. The rest of the volume is evacuated. When the canister is activated by squeezing (no work done activating) the partition breaks and the refrigerant fills the total volume. Final pressure is 100 kPa. a.) What are two assumptions needed for the problem? What properties are needed to solve part b.) and c.) b.) What is the change in specific enthalpy within the canister? c.) What is the final quality of the refrigerant within the canister?
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A piston/cylinder arrangement initially contains air at 150 kPa, 400°C. The setup is allowed to cool to the ambient temperature of 20°C. a. Is the piston resting on the stops in the final state? What is the final pressure in the cylinder? b. What is the specific work done by the air during this process?
A frictionless piston-cylinder device encloses 0.226 kg of saturated water-vapour mixture which is initially 10% by mass in liquid. The initial pressure is 1.035 MPa. The fluid is now heated until it all becomes saturated vapour. a. Find the work done during the process. Now, suppose that there is a stop in the cylinder that limits the piston to stop at the top when the volume is 0.0424 m'. b. Find the quality of the mixture when the piston just reached the stop, i.e. when the fluid volume is at 0.0424 m³.
3. In a hot water heating system, water heated to 95°C and then is pumped at the rate of 4 L/min through a radiator where it is cooled to 35°C. If the water arives at the radiator at a temperature of 85°C, how much heat in kJ does the radiator release each hour?