Question 121Refrigeration/AC - 1st Asst/Chief70% to pass
In a refrigeration system, the bulb for the thermal expansion valve is always located where?
AI Explanation
The correct answer is A) 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 leaves the evaporator. The TXV bulb senses the temperature of the refrigerant at this point 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 the TXV bulb is not located in the middle of the evaporator coils (B), at the evaporator coil inlet (C), or at the beginning of the bottom row of the evaporator coils (D). These locations would not allow the TXV bulb to accurately sense the temperature of the refrigerant leaving the evaporator.
Related Questions
#119 A typical shipboard domestic multi-box refrigeration system operates with one compressor and condenser. What is the purpose of the sensing line connected to the thermal bulb at the evaporator coil outlet? #120 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? #122 Besides the evaporator pressure, the thermal expansion valve reacts directly to changes in what parameter? #123 In a vapor compression type refrigeration cycle, the refrigerant temperature decreases the most when passing through which system component? #124 Which of the statements listed is applicable to the thermostatic expansion valve shown in the illustration? Illustration GS-RA-07