Question 184Refrigeration/AC - Assistant Engineer70% to pass
Constant superheat is maintained at the evaporator coil outlet of a refrigeration system or unit by the action of what device?
AI Explanation
The correct answer is A) thermal expansion valve.
The thermal expansion valve is the device responsible for maintaining constant superheat at the evaporator coil outlet of a refrigeration system. It does this by automatically adjusting the flow of refrigerant into the evaporator coil based on the temperature and pressure conditions, ensuring that the refrigerant is completely evaporated before it enters the compressor.
The other options are incorrect because: B) the king valve is used to isolate the refrigerant system, C) the low-pressure cutout switch is a safety device that shuts off the compressor if the suction pressure drops too low, and D) the solenoid valve is used to control the flow of refrigerant, but does not specifically maintain superheat.
Related Questions
#182 Which of the following illustrated expansion valves is designed to maintain a constant evaporator pressure rather than a constant evaporator superheat? Illustration GS-RA-24 #183 Besides the evaporator pressure, the thermal expansion valve reacts directly to changes in what parameter? #185 Concerning the proper installation of the sensing bulb of a thermal expansion valve that is attached to the evaporator tail coil on a horizontal run, what statement is true? #186 In the multi-evaporator refrigeration system shown in the illustration, what is the proper name for the valve labeled "29"? Illustration GS-RA-12 #187 In refrigeration systems with multiple evaporators, the metering of refrigerant to each refrigerated space evaporator is accomplished by what device?