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This study is the continuation of our study published in reference 1 concerning the cooling radiator performance on the vehicle. In addition to the last paper, two main parameters will be shown: the air velocity through the A/C condenser and its heat performance. They will be studied and presented, particularly,: The influence of the cooling radiator (geometry and performance), The influence of size and position of A/C condenser to the cooling radiator, The influence of the electric fan (size, power and performance, fan on or fan off), The influence of fan shroud (without fan shroud, with full fan shroud or with partial fan shroud), The influence of vehicle (pressure coefficient, grill, size of air inlet, under-hood, size of under-hood air outlet, etc).

This study shows the measurement and calculation of exhaust heat exchange coefficient in a pipe of internal combustion engine. A specific exhaust-air heat exchanger has been installed on the exhaust line of engine. The Nusselt-Reynolds correlation has been developed and compared to the steady state conditions. The Convective Augmentation Factor (CAF) is approximately 2 at low Reynolds number and 1 at high Reynolds number. The EGR cooler and the exhaust-coolant heat exchanger for improving the passenger compartment heating have been shown.

A radiator on a component wind tunnel will not perform as in the engine compartment due to the many mitigating factors: the water pump, the fan power, and other vehicle components like the grill, air inlet cross sectional area, bumper position, ram air, pressure coefficient at the front end and at the air outlet of underhood. A simple engine cooling system simulation model has been modeled allowing to predict the influence of each component listed above. The calculation results have been compared to the wind tunnel test results on seven different vehicles.