Question

Which one of the following \( p{-}h \) plots represents the ideal vapour compression cycle with intercooling? Here, \( p \) and \( h \) denote pressure and specific enthalpy respectively.

• A.
• B.
• C.
• D.

Hint:

To identify intercooling in a vapor compression cycle, look for a reduction in enthalpy at constant pressure between two compression stages in the \( p \)-\( h \) diagram.

Answer 1

The Correct Option is D

Step 1: Understand the concept of a vapor compression cycle with intercooling.
In an ideal vapor compression cycle with intercooling: 1. The refrigerant undergoes two-stage compression with an intercooler between the stages.
2. Intercooling reduces the temperature and enthalpy of the refrigerant between the first and second compression stages, improving efficiency and reducing work input.
3. This process appears as a reduction in specific enthalpy at constant pressure in the \( p \)-\( h \) diagram.
Step 2: Analyze the given options.
Option (A): Incorrect, as it does not show intercooling; it depicts a single-stage compression cycle.
Option (B): Incorrect, as it represents a simple vapor compression cycle without any intercooling.
Option (C): Incorrect, as it incorrectly depicts the two-stage process without a clear representation of intercooling.
Option (D): Correct, as it accurately represents a two-stage vapor compression cycle with intercooling, showing a reduction in enthalpy during the intercooling stage.
Conclusion: The \( p \)-\( h \) plot representing the ideal vapor compression cycle with intercooling is \( \text{(D)} \).