Improvement of Heat Exchanger Performance of Air Conditioner by Using Dimple Tube

摘要

High heat exchanger performance in air conditioners is very important to comfortable living and energy saving. We studied the refrigerant performance in a car heat exchanger with projections (dimples) on its inner walls. Experimental and analytical results showed that an elliptical dimple is optimum in heat transfer coefficient in for all types of dimple. Heat transfer coefficient of tubes with elliptical dimples is as twice that of an extruded tube. For a condenser with dimples, heat transfer increased 15percent compared to a current condenser. Comparing an evaporator with dimple tubes and a current evaporator, heat exchange was the same however a weight of the evaporator with dimple tubes was 10percent less than the current one. This evaporator is applied in a car.