Question 16Refrigeration/AC - Assistant Engineer70% to pass
Vapor bubbles present in the liquid upon arrival to the thermal expansion valve in a refrigeration system may cause erosion of the expansion valve's needle and seat. This, in turn, could cause what condition?
AI Explanation
The correct answer is C) TXV hunting.
Vapor bubbles in the liquid arriving at the thermal expansion valve (TXV) can cause the valve to hunt, or rapidly open and close, due to the eroded needle and seat. This erratic behavior of the TXV disrupts the proper control of refrigerant flow, leading to unstable superheat and temperature fluctuations in the system.
The other options are incorrect because: A) Freezing shut would restrict refrigerant flow, B) Freezing open would allow too much refrigerant to pass, and D) Overheating would not be a direct result of the eroded TXV valve.
Related Questions
#14 Sea water or low temperature central fresh water is typically provided to a ship's stores refrigeration plant for what purpose? #15 Zinc plates commonly found in refrigeration systems and used as sacrificial anodes are located where? #17 Moisture entering a typical refrigeration system will most likely produce what effect? #18 A small obstruction at the thermostatic expansion valve inlet will result in which of the following conditions? #19 An obstructed expansion valve may be indicated by an incompletely cooled evaporator and what other symptom?