Refrigeration Systems & Components Flashcards

What is the primary function of a receiver in a refrigeration system?

Answer: Store liquid refrigerant after the condenser

A receiver stores liquid refrigerant downstream of the condenser to ensure a steady supply to the metering device.

Which type of compressor uses a rotating eccentric to compress refrigerant without inlet/outlet valves?

Answer: Scroll compressor

Scroll compressors use two interleaved spiral scrolls to compress refrigerant continuously without the need for suction or discharge valves.

What happens to refrigerant subcooling when liquid line length increases significantly?

Answer: Subcooling decreases due to heat gain

Longer liquid lines expose refrigerant to more ambient heat, reducing subcooling and risking flash gas formation before the metering device.

A refrigeration system uses a flooded evaporator. What distinguishes it from a dry-expansion evaporator?

Answer: Refrigerant fills the entire evaporator with liquid

In a flooded evaporator, the entire heat exchanger is filled with liquid refrigerant, maximizing heat transfer surface contact.

What is the purpose of a suction accumulator in a refrigeration system?

Answer: Prevent liquid refrigerant from entering the compressor

A suction accumulator catches liquid slugs before the compressor, protecting it from hydraulic damage.

In a two-stage refrigeration system, what is the purpose of the intercooler?

Answer: Cool discharge gas between compression stages

The intercooler removes heat from the refrigerant between the first and second compression stages, improving efficiency and reducing discharge temperature.

Which refrigerant circuit component is most responsible for controlling system capacity in a variable-speed system?

Answer: Variable-frequency drive on the compressor motor

A variable-frequency drive (VFD) modulates compressor speed, directly controlling refrigerant mass flow and system capacity.