Experiment
Setup
An aluminum stock radiator was tested with a 2.5 L Subaru engine at idle conditions. The coolant used in the radiator was pure water. The inlet and outlet temperatures for both the water and the air were measured using a thermocouple. For the water, a probe can be inserted in the tube right before the fluid enters the radiator and right after it exits. The inlet temperature of air will be assumed to equal the ambient. A probe was placed approximately five inches from the fan on the back side of the radiator to measure the outlet air temperature. In addition, the flow rate of the air across the radiator was measured using an air flow meter. Lastly, the flow rate through the radiator was measured by attaching a rotameter just before the coolant enters the radiator.