🔍 Key Concepts

• Evaporator flow control methods in marine refrigeration • Difference between direct expansion and flooded (float-controlled) systems • How superheat control with a TXV affects evaporator performance

💭 Think About

• Think about which method gives the best balance of simplicity, reliability, and automatic control for typical shipboard cargo and provision plants. • Consider where low side and high side float controls are normally used: are they more common in large flooded systems or small/medium direct expansion systems? • Ask yourself which option is most often seen with common TXV-controlled evaporators used on ships.

✅ Before You Answer

• Identify which options describe direct expansion vs flooded/float type systems. • Confirm which type of system most shipboard provision and HVAC plants actually use day-to-day. • Verify which control method directly maintains constant superheat at the evaporator outlet as its primary function.