FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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A substance of mass 3.4 kg is inside a piston-cylinder assembly with an initial volume
of 0.31 m³, initial pressure of 2.4 bar, and initial temperature of 52°C. The substance
undergoes an isobaric expansion process until the volume is 0.82 m3. What is the
work transfer? Express the answer in kJ.
Two lbs of water vapor in a piston-cylinder assembly expands at a constant pressure of 250 lbf/in² from a saturated vapor state to a
volume of 7.08 ft³.
Determine the initial and final temperatures, in °F, and the work for the process, in Btu.
A closed system of constant volume experiences a temperature rise of 20°C when a certain process occurs. The heat transferred in the process is 18 kJ. The specific heat at constant volume for the pure substance comprising the system is 1.2 kJ/kg°C, and the system contains 2 kg of this substance. Determine the change in internal energy and the work done.The specific heat at constant pressure of one kg fluid undergoing a non-flow constant pressure process is given in kJ/kg ° C by where T is in °C. The pressure during the process is maintained at 2 bar and volume changes from 1 m3to 1.8 m3and temperature changes from 50°C to 450°C. Determine:(i) Heat added (ii) Work done (iii) Change in internal energy(ii) (iv) Change in enthalpy
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- Saturated liquid water contained in a closed, rigid tank is cooled to a final state where the temperature is 500C and the masses of saturated vapor and liquid present are 0.06 and 900 kg, respectively. Determine the heat transfer for the process, in kJ.arrow_forwardWater vapor contained in a piston–cylinder assembly undergoes an isothermal expansion at 299°C from a pressure of 6.4 bar to a pressure of 2.9 bar. Evaluate the work, in kJ/kg.arrow_forwardTwo lbs of water vapor in a piston-cylinder assembly expands at a constant pressure of 350 lb/in² from a saturated vapor state to a volume of 7.08 ft³. Determine the initial and final temperatures, in °F, and the work for the process, in Btu. Step 1 * Your answer is incorrect. Determine the initial temperature, in °F. T₁=₁ 322 Hint Save for Later °F Attempts: 1 of 4 used Submit Answerarrow_forward
- A gas contained within a simple piston-cylinder assembly with a fixed piston mass, initially at a volume of 0.3 m³, undergoes a quasi-equilibrium expansion at 1 bar to a final volume of 1 m³, while being slowly heated through the base. The change in internal energy of the gas is 0.85 kJ. The piston and cylinder walls are fabricated from heat-resistant materials for thermal insulation, and the piston moves smoothly in the cylinder without friction. By taking the gas as the system, (a) find the moving boundary work (W₁ = ₁² PdV) done by the gas, in kJ, and (b) the heat transfer between the system and its surroundings, in kJ.arrow_forwardTwo kg of Refrigerant 134a undergoes a polytropic process in a piston–cylinder assembly from an initial state of saturated vapor at 2 bars to a final state of 12 bars and 80°C. Determine the work transfer for the process, in kJ.arrow_forwardA cylinder with a moveable piston holds 0.48 lbm of hydrogen initially with a volume of 1.49 ft^3 temperature of 1281 °F. Then the volume is expanded to 3 ft^3 while the gas pressure remains contant. Determine the work in BTU.arrow_forward
- Nitrogen in a rigid vessel is cooled by rejecting 100 kJ/kg of heat. Determine the internal energy change of the nitrogen, in kJ/kg.arrow_forwardParvinbhaiarrow_forwardA piston-cylinder device contains 2 kg of water which is initially a saturated liquid at 300 ∘ C. It undergoes three processes to form a cycle. The first process is constant volume, the second is constant pressure at 2 bar and the third is a polytropic process where Pv 1.1 = constant. If you can calculate the heat transfer and work (both in kJ ) for each process. Is the device a heat engine or a refrigerator? Answer Table Description Work transfer for first process (kJ) Heat transfer for first process (kJ) Work transfer for second process (kJ) Heat transfer for second process (kJ) Work transfer for third process (kJ) Heat transfer for third process (kJ) Heat engine (1) or refrigerator (2) Value Value Thank youarrow_forward
- A 2 kg of steam occupying 0.3 m at 15 bar is expanded according to the law pvl3 = constant to a pressure of %3D 1.5 bar. The work done during the expansion will bearrow_forwardTwo kg of refrigerant R134a, initially at P₁ = 1 MPa, u₁ = 312.70 kJ/kg, is contained within a well-sealed copper tank. A paddle wheel is fitted into the tank to transfer energy to the refrigerant at constant rate of 0.1 kW. The refrigerant loses heat to its surroundings at a rate K-t2, in kW, where K is a constant, in kW per minute squared, and t is time, in minutes. After 10 minutes of stirring, the refrigerant is at p2 = 0.6 MPa and u₂ = 231.05 kJ/kg. No overall changes in kinetic and potential energy occur. (a) For the refrigerant, determine the work and heat transfer, each in kJ. (b) Determine the value of the constant K appearing in the given heat transfer relation, in kW/min².arrow_forwardThermodynamics A Piston-Cylinder system initially contains R-134a refrigerant at a temperature of 2.8 bar and 40 C, and its initial volume is 0.1 m3. First, heat is transferred to the system by keeping the piston constant and this process is continued until the pressure is 3.2 bar. the process is maintained by allowing the volume to change. At the end of this process, the temperature reaches 50C. Assuming the state changes as if balanced, calculate the following: a)He amount of heat transferred during constant pressure operation b)Show the state changes on the P-v diagram.arrow_forward
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