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If a refrigerant is undergoing expansion, which of the following remains constant?
- a)Enthalpy
- b)Work done
- c)Internal energy
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
If a refrigerant is undergoing expansion, which of the following rema...
Expansion is an adiabatic process, and hence enthalpy remains constant. Since it expands, work is done, and since work is done, internal energy changes.
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If a refrigerant is undergoing expansion, which of the following rema...
Understanding Refrigerant Expansion
When a refrigerant undergoes expansion, it typically happens in a component called the expansion valve or nozzle. During this process, several thermodynamic properties change, and it's essential to identify which one remains constant.
Key Points on Expansion Process:
- Constant Enthalpy (Isenthalpic Process)
In many refrigeration cycles, particularly in ideal scenarios, the expansion process is considered isenthalpic. This means that the enthalpy of the refrigerant remains constant during the expansion. The refrigerant transitions from a high-pressure state to a low-pressure state, allowing it to absorb heat from the environment.
- Work Done
The work done during expansion is not constant. It varies depending on the pressure difference and the specific design of the expansion device. The refrigerant does work against the external pressure as it expands, which can lead to changes in energy.
- Internal Energy
The internal energy of the refrigerant does not remain constant during expansion. As the refrigerant expands, it does work on the surroundings, which typically results in a decrease in internal energy, particularly when it absorbs heat from the surroundings.
Conclusion:
In summary, among the options provided, enthalpy is the only property that remains constant during the expansion of a refrigerant in an ideal refrigeration cycle, making option 'A' the correct answer. This understanding is crucial for designing efficient refrigeration systems and predicting their behavior under different operating conditions.
When a refrigerant undergoes expansion, it typically happens in a component called the expansion valve or nozzle. During this process, several thermodynamic properties change, and it's essential to identify which one remains constant.
Key Points on Expansion Process:
- Constant Enthalpy (Isenthalpic Process)
In many refrigeration cycles, particularly in ideal scenarios, the expansion process is considered isenthalpic. This means that the enthalpy of the refrigerant remains constant during the expansion. The refrigerant transitions from a high-pressure state to a low-pressure state, allowing it to absorb heat from the environment.
- Work Done
The work done during expansion is not constant. It varies depending on the pressure difference and the specific design of the expansion device. The refrigerant does work against the external pressure as it expands, which can lead to changes in energy.
- Internal Energy
The internal energy of the refrigerant does not remain constant during expansion. As the refrigerant expands, it does work on the surroundings, which typically results in a decrease in internal energy, particularly when it absorbs heat from the surroundings.
Conclusion:
In summary, among the options provided, enthalpy is the only property that remains constant during the expansion of a refrigerant in an ideal refrigeration cycle, making option 'A' the correct answer. This understanding is crucial for designing efficient refrigeration systems and predicting their behavior under different operating conditions.
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If a refrigerant is undergoing expansion, which of the following remains constant?a)Enthalpyb)Work donec)Internal energyd)None of theseCorrect answer is option 'A'. Can you explain this answer?
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