Energy Transfer by Work from Steam to Piston - 5kg Steam Expansion

In summary, a 5 kg steam undergoes an expansion process from state 1 to state 2 where there is a specific internal energy difference of 50.3 kJ/kg. During the process, there is heat transfer of 80 kJ to the steam and energy transfer by work of 18.5 kJ from a paddle wheel. The kinetic and potential energy of the steam remains unchanged. To determine the energy transfer by work from the steam to the piston during the process, the equation Q = u2 - u1 can be used.
  • #1
madahmad1
42
0
A 5 kg of steam contained within a piston-cylinder assembly undergoes an
expansion from state1, where the specific internal energy is u1 2709.9 kJ/kg,to state 2, where u2 2659.6 kJ/kg. During the process, thereis heat transfer to the steam with a magnitude of 80 kJ. Also, a paddle wheel transfers energy to the steam by work in theamount of 18.5 kJ. There is no significant change in the kinetic or potential energy of the steam. Determine the energytransfer by work from the
steam to the piston duringthe process, in kJ.

Anybody have an idea as to how this can be answered?
 
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  • #2
Please read the forum Guidelines. We can not help with textbook problems unless you show some effort first. Also, next time round, use the Homework & Coursework Forum near the top of the main page.
 
  • #3
Equation

u = uf + x(ug-uf) Q= u2-u1

Should i use this equation or which one?
 

1. How does energy transfer occur from steam to piston in a steam engine?

Energy transfer from steam to piston occurs through the process of work. The steam, which is under high pressure, expands and pushes against the piston, causing it to move. This movement of the piston is what transfers the energy from the steam to the piston.

2. What is the significance of using 5kg of steam in the expansion process?

The amount of steam used in the expansion process is important because it determines the amount of energy that can be transferred to the piston. Using 5kg of steam ensures that there is enough steam to produce a significant amount of work and power the engine.

3. Can the energy transfer by work from steam to piston be reversed?

Yes, the energy transfer by work from steam to piston can be reversed by using a condenser. The condenser cools and condenses the steam back into water, allowing it to be reused in the expansion process.

4. What factors affect the efficiency of energy transfer from steam to piston?

The efficiency of energy transfer from steam to piston can be affected by various factors such as the quality of the steam, the design of the engine, and the friction between the piston and the cylinder. Higher quality steam and a well-designed engine can result in more efficient energy transfer.

5. How does energy transfer from steam to piston contribute to the overall function of a steam engine?

The energy transfer from steam to piston is vital to the function of a steam engine. It is the primary process that drives the movement of the piston, which in turn powers the machinery connected to the engine. Without this energy transfer, the steam engine would not be able to perform its intended function.

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