Question 61Refrigeration & AC - QMED

The correct answer is D) at the evaporator coil outlet. The thermal expansion valve bulb is located at the evaporator coil outlet because this is the point where the temperature of the refrigerant leaving the evaporator coil needs to be monitored. The thermal expansion valve regulates the flow of refrigerant into the evaporator based on the temperature and pressure at the evaporator outlet, in order to maintain the proper superheat and ensure efficient operation of the refrigeration system. The other options are incorrect because the thermal expansion valve bulb needs to be positioned to sense the temperature of the refrigerant at the evaporator outlet, not at the inlet, middle, or beginning of the evaporator coils.