Question 173Refrigeration & AC - Assistant Engineer

70% to pass

In a refrigeration system, the bulb for the thermal expansion valve is always located where?

Ain the middle of the evaporator coils

Bat the evaporator coil inlet

Cat the evaporator coil outlet

Dat the beginning of the bottom row of the evaporator coils

AI Explanation

The correct answer is C) at the evaporator coil outlet. The thermal expansion valve (TXV) bulb is located at the evaporator coil outlet because this is the point where the refrigerant exits the evaporator. The TXV bulb senses the temperature of the refrigerant leaving the evaporator and adjusts the valve opening to maintain the proper superheat, which is critical for the efficient operation of the refrigeration system. The other options are incorrect because: A) the middle of the evaporator coils is not the optimal location for the TXV bulb, B) the inlet of the evaporator is not the best place to sense the refrigerant temperature, and D) the bottom row of the evaporator is not the proper location for the TXV bulb.

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Official Resources

46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center

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