🔍 Key Concepts

• Economizer in a rotary chiller – what it does to the liquid refrigerant between the condenser and the evaporator • Motor cooling path – which refrigerant actually passes over/around the hermetic motor windings in this schematic • System efficiency – how removing flash gas or subcooling liquid affects evaporator performance

💭 Think About

• On the illustration, trace the refrigerant line leaving the condenser liquid line toward the economizer. Where does the refrigerant go next from the economizer – into the motor section, the evaporator, or an intermediate port on the compressor? • Compare the flow that clearly passes over the hermetic motor windings with the lines connected to the economizer. Do they match, or are they part of different circuits? • Think about what happens thermodynamically when some refrigerant is flashed off in an economizer: does that mainly provide a dedicated motor cooling medium, or does it change the condition of the liquid going to the evaporator?

✅ Before You Answer

• Verify from the diagram which component the economizer outlet is directly connected to – intermediate compressor port / evaporator vs. motor cooling jacket. • Confirm where the motor-winding cooling path is shown in the legend and piping colors, and whether it is labeled as coming from the economizer or from suction gas/another source. • Decide which statement matches the principal, system‑wide effect of flashing refrigerant to an intermediate pressure and sending colder liquid to the evaporator: local motor cooling or overall plant efficiency.