二重管式熱交換器の伝熱高効率化に関する研究

抄録

In 1997, Since Kyoto Protocol was adopted, developed countries in the world started regulate the emission of Greenhouse Gas. In 1999, the goal of fuel consumption was set in Japan. In addition, in recent years in japan, about 20 percent of the Greenhouse Gas emissions are transportation centered on automobiles. Among them, since the car air conditioner operates using the engine power, fuel consumption of about 9 percent on average per year is carried out. So, from the viewpoint of protecting the global environment, inner heat exchanger which is part of the car air conditioner is demanded high efficiency. In order to realize this, in our university laboratory, we are studying about rib which is laid on the wall of heat exchanger for the purpose of promotion of stirring action of inner flow and increase of the heating area. Since the difference of structure of rib cause the change of flow structure in the inner tube, it is important to compare the flow structure and consider the most appropriate structure of rib. As the way to do it, numerical analysis is effective because it is possible to evaluate the performance at a low cost. So in this study, we conducted fluid analysis in the single tube which has rib structure and compared thermal efficiency.