Which type of compressor is known for using displacement to compress refrigerants?

The correct answer is that all of the mentioned types of compressors utilize displacement to compress refrigerants. Displacement is the primary principle by which these compressors function, as it involves reducing the volume of refrigerant within a chamber to increase its pressure.

Rotary compressors usually achieve this by using cylindrical rollers or vanes to compress the refrigerant in a rotating motion. This compact and efficient approach allows for relatively smooth operation and is commonly used in applications where space is limited.

Scroll compressors compress refrigerants with two spiral-shaped elements. As these two spirals move in relation to each other, the refrigerant gets trapped in the pockets formed between them and is gradually compressed until it reaches the discharge pressure. This design is known for its quiet operation and high efficiency.

Reciprocating compressors operate on the principle of a piston that moves back and forth in a cylinder, drawing in refrigerant vapor, compressing it during the piston’s stroke, and then discharging the high-pressure vapor. This type is versatile and is widely used in various refrigeration and air conditioning applications.

Since all of these compressor types rely on the idea of displacing refrigerant to create pressure, it is accurate to state that they all fit the description provided in the question.