Refrigeration System Components Flashcards

In an ammonia system, what is the primary function of the high-pressure receiver?

Answer: Store liquid refrigerant and absorb fluctuations in system charge

The high-pressure receiver stores condensed liquid and buffers charge changes as load varies.

Which compressor type uses two meshing helical rotors to compress refrigerant vapor?

Answer: Rotary screw compressor

A rotary screw compressor traps and compresses gas between intermeshing male and female rotors.

What device on a screw compressor is used to vary capacity by changing the effective length of the rotors?

Answer: Slide valve

The slide valve moves to recirculate gas back to suction, reducing the effective compression length and capacity.

In an evaporative condenser, how is heat primarily rejected from the refrigerant?

Answer: By evaporation of water sprayed over the coil while air is drawn through

Evaporative condensers reject heat mainly through the latent heat of water evaporating off the coil surface.

What is the purpose of an oil separator installed in the compressor discharge line?

Answer: Remove oil from discharge gas and return it to the compressor

The oil separator captures oil carried over in discharge gas so it does not foul condensers and evaporators.

Which component protects a compressor from liquid slugging by separating liquid from returning suction vapor?

Answer: Suction accumulator or low-pressure receiver

Accumulators and low-pressure receivers trap liquid so only vapor reaches the compressor suction.

What does a thermostatic expansion valve (TXV) control?

Answer: Superheat at the evaporator outlet

A TXV meters refrigerant flow to maintain a set superheat at the evaporator outlet using a sensing bulb.