Answered

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Which characteristic determines when a system must be charged by superheat?

A. The metering device is a TXV
B. The metering device is a fixed-orifice
C. The system is equipped with a sight glass
D. The system uses an azeotropic refrigerant

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Final answer:

The necessity of superheat in a refrigeration system is determined by the type of metering device used.


Explanation:

Superheating in a refrigeration system is determined by the type of metering device used. When a system has a TXV metering device, superheating is crucial to ensure proper refrigerant flow and system efficiency. On the other hand, if the system has a fixed-orifice metering device, superheating is not necessary as the device itself regulates the refrigerant flow.


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