🔍 Key Concepts

• Vapor-compression refrigeration cycle and what happens to pressure and temperature at each stage • Difference between compression (work added) and expansion/throttling (pressure drop without work) • Where the refrigerant experiences a sudden pressure drop versus more gradual heat transfer

💭 Think About

• Trace the refrigerant through the system in the correct order and note what happens to its pressure and temperature at each component • Ask yourself: in which components does the refrigerant mostly change phase at nearly constant temperature, and in which does it have a sudden temperature change? • Eliminate any component where you know the refrigerant temperature mainly goes up rather than down

✅ Before You Answer

• Identify which listed component is associated with heat absorption inside the box and which with heat rejection to ambient air • Recall which component’s main job is storage of liquid rather than changing temperature or phase significantly • Verify which component in a standard HFC-134a system is responsible for the largest single temperature drop of the refrigerant as it flows through the system