Why is refrigerant vapor reintroduced to the chiller before liquid refrigerant?

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The choice that states refrigerant vapor is reintroduced to the chiller before liquid refrigerant is correct because liquid refrigerant in a deep vacuum can indeed boil and freeze water. If liquid refrigerant were introduced into a vacuum system, it can undergo rapid phase change, potentially leading to freezing moisture within the system. This is problematic as it can cause blockages, inefficiencies, or damage to components.

Introducing vapor first helps in stabilizing the system and preventing these issues by allowing the vapor to mix with the low-pressure conditions within the chiller before any liquid refrigerant is introduced. This process aids in ensuring that the refrigerant is handled properly and that the system operates smoothly, minimizing risks associated with freezing.

While ensuring energy efficiency, preventing system overload, and maintaining optimal pressure are important operational considerations for chillers, they do not directly address the specific hazards posed by introducing liquid refrigerant into a vacuum system, which is primarily handled by ensuring vapor is reintroduced first.

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