Question 59Refrigeration/AC - QMED70% to pass
Rather than design an infinite variety of thermostatic expansion valve sizes to accommodate different capacities for heat removal, some manufacturers use a few standard valve body sizes in conjunction with what other feature?
AI Explanation
The correct answer is B) internal needle valve orifices of various sizes to accommodate different heat removal capacities.
Thermostatic expansion valves are used to control the flow of refrigerant into the evaporator based on the superheat of the refrigerant. Rather than having a different valve body size for each capacity, manufacturers use a few standard valve body sizes and incorporate different sized internal needle valve orifices. This allows them to accommodate a range of heat removal capacities without the need for an infinite variety of valve body sizes. The other options, such as adjustable superheat, flexible diaphragms, or internal equalizers, are not the primary method used by manufacturers to handle different capacities.
Related Questions
#57 Through which of the components shown in the illustration is flash gas formation a normal occurrence? Illustration GS-RA-25 #58 In refrigeration systems with multiple evaporators, the metering of refrigerant to each refrigerated space evaporator is accomplished by what device? #60 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 #61 In a refrigeration system, the bulb for the thermal expansion valve is always located where? #62 Which of the valves listed is normally closed when charging the refrigeration system through the high side?