自動車用熱交換器の内部凍結に関する基礎研究

抄録

Recently, the fuel consumption of automobiles has been reduced, and the demand for turbochargers has increased. A heat exchanger called an intercooler is used with this equipment. The problem is that the intercooler may be destroyed by the condensation and solidification of the steam in the compressed air when using it in a low temperature environment. Previous studies have conducted frosting and defrosting experiments on fin-and-tube heat exchangers. However, there are few studies on frost formation in the internal channel, and the frost formation process is not clearly known. The purpose of this research is to reproduce the frosting phenomenon on the fins installed inside the flow path and to understand the frost formation phenomenon in more detail by visualizing the frost formation process. We conducted an experiment using two types of fins and investigated the effect of the fin shape on the frost formation phenomenon. In the experiment, we measured temperature, humidity, flow rate, and flow path differential pressure, and calculated heat transfer rate to understand the frost phenomenon. As a result of the experiment, in the triangular fin, water droplets were likely to stay between the fins, and the flow path was clogged earlier.