论文部分内容阅读
任何电子器件冷却的热电路都是由3个最基本的热阻组成的:结-壳热阻Rj-c;壳-散热器热阻Rc-s和散热器至周围介质的热阻Rs-a。为降低这些热阻的临界值,许多工程师费尽心血。文章讨论采用热管有助于降低热阻Rs-a至最小值。散热器至周围介质的热阻是由传导、对流/辐射和被加热的冷却介质形成的3个热阻组成的。典型的风冷散热器中,空气温升的热阻是通风量的直接函数,对流热阻是散热表面积的函数,传导热阻是散热器材料的热导率和几何尺寸的函数。热管能把传导损耗降至最小值,它允许加大散热表面,而且使给定风速下的流量最大,从而有效降低散热器的3个主热阻。文章讨论了能降低风冷散热器热阻的热管。
The thermal circuit for any electronic component cooling is made up of three basic thermal resistances: junction-case thermal resistance Rj-c; case-heatsink thermal resistance Rc-s and the heat sink’s resistance to the surrounding medium Rs-a . To reduce the critical value of these thermal resistance, many engineers work hard. The article discusses using heat pipes to help reduce the thermal resistance Rs-a to a minimum. The thermal resistance of the heat sink to the surrounding medium consists of three thermal resistances formed by conduction, convection / radiation and the heated cooling medium. In a typical air-cooled heatsink, the thermal resistance of the air temperature rise is a direct function of the amount of airflow and the convective thermal resistance is a function of the heat sink surface area as a function of the thermal conductivity and geometry of the heat sink material. The heat pipe minimizes conduction losses, allowing larger heat dissipation surfaces and maximizing flow at a given wind speed, effectively reducing the 3 main thermal resistances of the heatsink. The article discusses heat pipes that reduce the thermal resistance of air-cooled radiators.