Is a Closed, Adiabatic Device Feasible For Work With Steam?

It is not possible for the entropy of the steam to remain constant in an adiabatic process.In summary, the conversation discusses the concept of adiabatic devices and their ability to produce useful work by expanding steam. The term "adiabatic" implies no change in entropy due to heat transfer, leading to a discussion about using steam tables to determine if there is a change in entropy between two given states. It is concluded that the entropy cannot remain constant in an adiabatic process.
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Nah346
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0
2. A closed, adiabatic device claims to derive useful work by expanding 1 kg of steam from 500 C and 20 bar to 100 C and 1 bar. Do you believe this claim? Assume steam is a real fluid following the steam tables in Appendix A.III.
 
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  • #2


"Adiabatic"; what does that tell you about entropy change?
 
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"Adiabatic" indicates that there is No change in entropy due to heat transfer. Therefore that would eliminate the (SQ/T) and leave us with (S2-S2 = Sgen)
 
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Nah346 said:
"Adiabatic" indicates that there is No change in entropy due to heat transfer. Therefore that would eliminate the (SQ/T) and leave us with (S2-S2 = Sgen)

Yes, so go to your tables and find out if s has or has not changed between your two given states.
 
  • #5


I cannot provide a definitive answer without further information and experimentation. However, based on the given information, it is possible that a closed, adiabatic device could derive useful work with steam. The key factor would be the efficiency of the device in converting the expansion of the steam into useful work. Additionally, the properties of steam, such as its specific volume and enthalpy, would need to be accurately measured and accounted for in the calculations.

Furthermore, the feasibility of this claim would also depend on the design and construction of the device itself. The device would need to be well-insulated to ensure adiabatic conditions, and it would also need to be able to withstand the high temperatures and pressures involved in the expansion of the steam.

In conclusion, while it is possible that a closed, adiabatic device could derive useful work with steam, further investigation and experimentation would be needed to determine the feasibility of this claim.
 

FAQ: Is a Closed, Adiabatic Device Feasible For Work With Steam?

1. What is a closed, adiabatic device?

A closed, adiabatic device is a system that does not exchange heat or matter with its surroundings. This means that the energy inside the system remains constant and there is no transfer of heat between the system and its surroundings.

2. How is steam used in closed, adiabatic devices?

Steam is used in closed, adiabatic devices as a working fluid to drive mechanical processes. The steam enters the device at a high pressure and is expanded, doing work on the surrounding environment. As there is no heat exchange, the steam is then condensed back into liquid form and can be reused in the closed system.

3. What are the advantages of using a closed, adiabatic device for work with steam?

One advantage of using a closed, adiabatic device is that it is a more efficient way to harness the energy of steam. As there is no heat transfer, all of the energy in the steam is used to do work, resulting in a higher efficiency compared to open systems. Additionally, closed, adiabatic devices are more environmentally friendly as they do not release excess heat into the surroundings.

4. Are there any limitations to using a closed, adiabatic device for work with steam?

One limitation of using a closed, adiabatic device is that it requires a constant supply of steam to maintain its operation. This means that the device may need to be connected to a steam source and may not be suitable for all applications. Additionally, closed, adiabatic devices are more complex and may require more maintenance compared to open systems.

5. How is the feasibility of a closed, adiabatic device determined?

The feasibility of a closed, adiabatic device is determined by various factors such as the availability of a steam source, the type of work that needs to be done, and the cost and complexity of the device. A feasibility study would need to be conducted to assess these factors and determine if a closed, adiabatic device is a suitable and practical option for the specific application.

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