🔍 Key Concepts

• Typical refrigeration cycle flow: compressor → condenser → ? → evaporator → compressor • Purpose of an economizer in a two‑stage centrifugal system • Function of an expansion valve versus a heat exchanger/evaporator

💭 Think About

• Look at the drawing and identify which component receives high‑pressure liquid straight from the condenser outlet line • Ask yourself: in a two‑stage centrifugal system, where is flash gas separated out before the liquid is throttled to the evaporator? • Which of the labeled components is acting as a storage/separation vessel rather than a throttling device or heat exchanger?

✅ Before You Answer

• Trace the line from the condenser outlet in the illustration and see exactly which numbered component it connects to first • Confirm which option (A–D) is the component that separates liquid and flash gas before feeding the evaporator in a two‑stage system • Make sure you are not confusing the throttling device (valve/orifice) with the intermediate vessel that the condenser liquid goes to first