モデル実験による放熱性能評価の研究

抄録

In this study of a cooling fin, which is a key component of a heat exchanger, we examined the geometric factors that affect radiation performance. It is diffcult to evaluate heat radiation directly. Heat radiation occurs due to the temperature difference between the cooling fin and the ambient air, and the ambient air temperature around a cooling fin is greatly affected by wind velocity. It was therefore thought that heat radiation could be evaluated by using the wind velocity and the temperature difference between the cooling fin and the ambient air as parameters. Since heat is radiated from the fin surface, another evaluation was carried out simultaneously using wind velocity and the heat transfer coefficient with surface area taken into consideration. A linear evaluation was considered applicable in both cases, so the evaluations were performed by use of the zero-point proportional S/N ratio, and the results were used to carry out parameter designs. Evaluation by use of the heat transfer coefficient gave better reproducibility of the gain than did evaluation by use of the temperature difference, and indicated geometric factors affecting radiation performance. This led to the conclusion that to evaluate radiation performance, it is necessary to use the heat transfer coefficient and consider the surface area of the fin where heat exchange occurs.