Automatic vehicle radiation performance variables
Abstract
Most vehicles rely on water to get rid of excess combustion heat as the water transfers the engine heat and remove it to the outside as it passes through a radiator installed in front of the engine. The radiator consists of a top and bottom reservoir connected to each other by finned metal pipes. The heat passes from the water to the pipe walls and related fins. The heat then passes through the air passing through the pipes as the vehicle moves.
The radiator of the vehicle (water cooler) is a cross flow heat exchanger; both fluids (water and air) are unmixed.
In this study, the effect of changing the water flow rate and the overall heat transfer coefficient during radiator on the surface of the external radiator surface and on the radiator performance, i.e., its effect on the rate of heat removed from the water and on the temperature of air exit from the radiator was studied. It was found that when radiator water flow rate increased from 0.03 kg/s to 0.07 kg/s , the radiator surface area increased from 0.82 m2 to 2.35 m2 and the air exit temperature from radiator increased from 312 K to 327 K. The rate of heat removed from water increased from 8839 W to 20624 W when the overall heat transfer coefficient value is 200 W/m2.K.
The results also show that when the overall heat transfer coefficient increases from 200 W/m2.K to 400 W/m2.K, the rate of heat removed from water increases from 14731.5 W to 18519.6 W. The air exit temperature of the radiator increases from 319.5 K to 324.5 K when the water flow rate during radiator is 0.05 kg/s.
