In refrigeration, what does compression refer to?

• A. Decreasing the pressure of a refrigerant
• B. Heating the refrigerant before it enters the evaporator
• C. Increasing the pressure of the refrigerant
• D. Condensing vapour into liquid

Answer: (C)

In refrigeration, compression is a crucial process that involves increasing the pressure of the refrigerant. During this phase, the refrigerant gas is drawn into the compressor, where its volume is reduced, and its pressure is raised significantly. This increase in pressure raises the temperature of the refrigerant as well, preparing it for the next stage of its cycle, which is typically the condensation phase.

Understanding this process is vital because the efficiency and effectiveness of the refrigeration system directly depend on how well the refrigerant is compressed. The ability of the compressor to maintain proper pressure is essential for ensuring that the refrigerant can absorb heat from the environment in the evaporator and subsequently release it during condensation.

The other options describe different processes related to refrigeration but do not accurately reflect what compression entails. Decreasing the pressure of a refrigerant refers instead to the expansion process, heating the refrigerant would typically occur in the evaporator phase, and condensing vapor into liquid specifically describes the phase transition that occurs in the condenser, not the compression itself.