Question

During the compression process of a vapor compression refrigeration system:

• A. Specific enthalpy before and after the compression is the same
• B. Internal energy before and after the compression is the same
• C. Temperature before compression and after the compression is the same
• D. Specific entropy before and after the compression is the same

Hint:

In an ideal compression process, the entropy of the refrigerant remains constant. However, due to inefficiencies in real systems, entropy will generally increase.

Answer 1

The Correct Option is D

Step 1: Understand the compression process in refrigeration systems.
In a vapor compression refrigeration system, the compression process is often modeled as an isentropic process, meaning that the entropy remains constant. This is the ideal case, and in real systems, some increase in entropy may occur due to irreversibilities.
Step 2: Characteristics of compression.
During the ideal compression process, the specific entropy before and after the compression remains unchanged. This is because the process is assumed to be adiabatic and reversible (isentropic).