What is necessary to prevent fractionation of a blended refrigerant?

To prevent fractionation of a blended refrigerant, it is essential to charge the refrigerant as a blended liquid. Fractionation occurs when the components of a refrigerant blend separate due to variations in vapor pressures and boiling points during the phase change process. When a blended refrigerant is charged as a liquid, it ensures that all components are present in their proper ratios, maintaining the intended performance characteristics and efficiency of the refrigerant.

Charging the refrigerant in its liquid state allows for the equal mixing of the various components within the blend, preventing the lighter components from vaporizing and escaping while the heavier components remain. This preserves the integrity of the blend and ensures that the system operates effectively.

In contrast, charging as a gas or solid would not provide proper mixing of the components in the blend, which could lead to performance issues and inefficiency in the refrigeration system. Charging it as an aerosol, while it may disperse the refrigerant, does not maintain the crucial blend ratio necessary for optimal performance. Thus, charging as a blended liquid is the best practice to prevent fractionation.