Which component would typically be found in a closed-loop cooling system?

In a closed-loop cooling system, the primary purpose of the expansion valve is to regulate the flow of refrigerant into the evaporator coil. By doing this, it enables the system to maintain the desired temperature and pressure levels necessary for efficient cooling. The expansion valve works by reducing the pressure of the refrigerant, which allows it to expand and absorb heat effectively in the evaporator. This component is crucial for the overall function of the cooling system as it directly impacts the performance and efficiency of heat exchange.

In contrast, other components listed serve different functions. An open fan is typically found in an open-loop system where air circulation is necessary, while a subcooler is an additional component that may be present in more complex cooling systems, not a standard part of every closed-loop system. An accumulator functions to store excess refrigerant and does not directly control the refrigerant flow like the expansion valve does. Thus, identifying the expansion valve as a key component in a closed-loop cooling system highlights its critical role in ensuring optimal system performance.