What is this type of cooling system called?

• A. An Open loop system
• B. A Direct expansion system
• C. A Closed loop system
• D. A Sealed air cooling

Answer: (C)

It’s about whether the coolant stays inside a closed, recirculating loop. In a closed loop cooling system, the fluid is confined to a single circuit and kept moving by a pump, absorbing heat from the source, passing through a heat exchanger (like a radiator), releasing heat to the surroundings, and returning to start the cycle again. Because the loop is sealed, coolant isn’t drawn from or discharged into the environment, which prevents loss and contamination and allows steady, controllable cooling.

This is different from an open loop setup, where the coolant would interact with the outside environment or require replenishment and isn’t kept in a single, closed circuit. Direct expansion refers to a refrigeration method where the refrigerant itself expands in the evaporator to absorb heat, not a liquid cooling loop. Sealed air cooling uses air as the cooling medium rather than circulating liquid, so there isn’t a liquid loop at all.

So, the system described is best described as a closed loop system.