A piston-cylinder device contains 0.05 m3 of water at 200kPa and 25ºC

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SUMMARY

The discussion focuses on a thermodynamic problem involving a piston-cylinder device containing 0.05 m3 of water at an initial pressure of 200 kPa and temperature of 25ºC. As heat is added, the water evaporates and expands, reaching a volume of 0.2 m3 before the piston compresses a linear spring with a spring constant of 150 kN/m. The key objectives are to determine the final pressure and temperature, as well as the work done during the process, which is calculated to be 55 kJ. The process is also to be illustrated on a P-V diagram.

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b1977
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1. Homework Statement A piston-cylinder device contains 0.05 m3 of water at 200kPa and 25ºC. The cross sectional area of the piston is 0.25 m2. Heat is now transferred to the water, causing part of it to evaporate and expand. When the volume reaches 0.2 m3 the piston reaches a linear spring whose spring constant is 150kN/m. More heat is transferred to the water until the piston rises 30 cm more. Determine:
(i) The final pressure and temperature and
(ii) The work done during this process. Also, show the process on a P-V diagram.



Homework Equations

PV=MRT



The Attempt at a Solution

55 KJ
 
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b1977 said:

The Attempt at a Solution

55 KJ

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