Refrigeration compressors: What is the pressure at the outlet of a refrigerant compressor commonly called?

Introduction / Context:
Correct terminology helps technicians interpret gauges and troubleshoot systems. Compressor ports are commonly referred to as suction (inlet) and discharge (outlet) sides.

Given Data / Assumptions:

• Vapour-compression refrigeration cycle.
• Compressor increases refrigerant pressure and temperature.
• Outlet feeds the condenser.

Concept / Approach:
The compressor outlet is the high-pressure side that delivers hot, superheated vapour to the condenser. Its pressure is therefore called discharge pressure. Conversely, the inlet is the low-pressure suction side connected to the evaporator.

Step-by-Step Solution:

Verification / Alternative check:
Most gauge sets have a high-side (discharge) and low-side (suction) connection, reflecting this terminology.

Why Other Options Are Wrong:

Suction pressure: inlet side only.Critical pressure: thermodynamic property of a fluid, not a line pressure.Back pressure: often refers to downstream resistance in other contexts; in refrigeration it is not the standard name for compressor outlet.

Common Pitfalls:
Confusing absolute vs gauge readings; discharge pressure is typically discussed as gauge pressure referenced to ambient.

Final Answer:

Discharge pressure