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An evaporator which is one of important components of the automobile air conditioning system has been developed on the view point of increasing heat transfer coefficient and decreasing fluid pressure loss. To employ new configuration of refrigerant side heat transfer tube surface could improve heat transfer coefficient by 2.6 times of smooth surface heat transfer coefficient. A distribution adjustment pipe and optimized arrangement of heat transfer tubes were applied to achieve uniform refrigerant flow distribution. We tried to minimize the increase of refrigerant side pressure caused by employing turbulizers inside the heat transfer tubes. We studied on thermo-fluidic behavior experimentally and developed new high performance evaporator.

The prediction method on flow and thermal performance in the cooling unit of automobile air conditioning systems was investigated. The two- and three-dimensional flow in the model unit based on the actual cooling unit was numerically solved by the modified FLIC (Fluid In Cell) method. The effect of the air flow maldistribution on the thermal performance of the evaporator was predicted by using the air flow distribution calculated about the model unit. Some experiments were performed to confirm the above numerical procedures. It is shown that both predicted results are in good agreement with the measured data.