Which component is used to reduce noise from gas pulsation in hermetic refrigeration units and may be located on both the intake and exhaust of the compressor?

• A. Expansion valves
• B. Filters
• C. Mufflers
• D. Dampers

Answer: (C)

Noise reduction from gas pulsations in hermetic refrigeration units is addressed by using mufflers. Reciprocating compressors create rapid pressure changes as gas moves in and out, producing pulsations and noise. A muffler provides a path for the gas while interrupting and absorbing the sound waves, using internal chambers, baffles, or absorbing material to dissipate acoustic energy. Placing mufflers on both the intake and exhaust helps mute noise from both directions, giving quieter overall operation. Expansion valves regulate refrigerant flow but don’t attenuate sound; filters remove particles and don’t affect pulsation noise; dampers can lessen vibration or flow surges but aren’t designed to specifically quiet the compressor’s pulsating gas.