통신장비용 액냉형 열교환기의 성능실험에 관한 연구

In this study, liquid cooling heat exchangers for telecommunication equipment were designed and tested by varying heat density and operating conditions. The optimal design of liquid cooling heat exchanger was discussed. The liquid-cooling heat exchangers had twelve rectangular channels with different flow paths of 1, 2, 4, and 12. Silicon rubber heaters were used to control the heat load to the heat exchangers. Heat input ranged from 293 to 800W, and inlet temperatures of working fluid varied from 15 to 27℃. The local heat transfer coefficients defined by the mean temperature of the working fluid were compared with the increase of mass flow rate. The heat transfer coefficients were strongly affected by flow conditions. The enhancement factor which was defined as the ratio of heat transfer enhancement factor to pressure drop penalty factor was employed to estimate the performance of the heat exchangers. Even though the 4 path channel heat exchanger showed higher heat transfer coefficient than the 12 path channel heat exchanger, the enhancement factor of the 12 path channel heat exchanger was higher than the 4 path channel heat exchanger due to a lower pressure drop.