🔍 Key Concepts

• Subcooling in a refrigeration system and how it affects flash gas formation in the liquid line • What a condenser actually does versus what a liquid–suction heat exchanger does • Relationship between liquid line temperature, saturation temperature, and percent of liquid that flashes to vapor at the expansion device

💭 Think About

• For each method (I and II), ask: does this directly lower the temperature of the liquid refrigerant below its saturation temperature at the condensing pressure? • Think about what happens when warm liquid refrigerant passes through the expansion valve: how does more or less subcooling affect the amount of flash gas formed? • Consider whether simply having a properly sized condenser guarantees subcooling, or whether an additional component is specifically used to create extra subcooling.

✅ Before You Answer

• Verify which component is specifically designed to increase liquid subcooling under normal operating conditions • Check whether proper sizing of the condenser always means the liquid leaving is subcooled, or if it can still be at saturation temperature • Confirm what a liquid line to suction line heat interchanger does to the liquid line temperature and the suction gas temperature