Which factor does NOT affect the performance of a refrigeration system?

The performance of a refrigeration system is influenced by several critical factors, but the color of the compressor does not play a role in how effectively the system operates.

Refrigerant type significantly impacts the system's efficiency, pressure, and overall ability to absorb and reject heat. Different refrigerants have varying thermodynamic properties, which affect the system's cooling capacity and energy consumption.

Ambient temperature plays a crucial role as well. The temperature of the environment where the refrigeration system operates affects its ability to reject heat. Higher ambient temperatures can lead to decreased efficiency because the system must work harder to cool down the refrigerant.

Indoor humidity levels also affect the performance of the system. High humidity can increase the load on the refrigeration system because moisture must be removed from the air, adding to the overall cooling demand.

In contrast, the color of a compressor does not have any bearing on its functionality or the refrigeration cycle itself. While color may have some aesthetic or branding relevance, it has no impact on thermal dynamics, pressure management, or any other operational parameters of the refrigeration system. Thus, this factor is the correct choice as it does not influence performance.