Question 132Refrigeration/AC - 1st Asst/Chief70% to pass
In a refrigeration system, the pressure within the power element of a thermostatic expansion valve depends directly upon what factor?
AI Explanation
The correct answer is C) temperature of the evaporator coil outlet.
The pressure within the power element of a thermostatic expansion valve depends directly on the temperature of the refrigerant leaving the evaporator coil. This is because the power element contains a fluid that expands and contracts in response to changes in temperature, which in turn controls the opening of the valve to maintain the desired superheat at the evaporator outlet.
The other options are incorrect because they do not directly determine the pressure in the power element. The compressor suction pressure (A) and the temperature in the box (B) can influence the operation of the thermostatic expansion valve, but they do not directly affect the pressure within the power element. The heat transferred from the saturated liquid in the evaporator (D) affects the evaporator coil temperature, but it is the resulting temperature at the evaporator outlet that determines the pressure in the power element.
Related Questions
#130 In refrigeration systems with multiple evaporators, the metering of refrigerant to each refrigerated space evaporator is accomplished by what device? #131 When a refrigeration compressor is in the 'off' cycle, the thermal expansion valve will react in what way? #133 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 #134 The thermostatic expansion valve in a refrigeration system further opens when the diaphragm flexes downward. With all other conditions being the same, what single condition causes this? #135 In the illustrated refrigeration system, what is the proper name for the component labeled "A"? Illustration GS-RA-12