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冷却系统占地面积更小、功率密度更高 - China Medical Device Manufacturer
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Fri, January 19th, 2018

2009 秋季刊 » 技术新知
冷却系统占地面积更小、功率密度更高

两相冷却系统的安装组件包括三列铜质微型通道和硅片。

受热过度一直是困扰电子设备的问题,而冷却部件不仅会占用设备内部的空间,还会增加能耗。派克汉尼芬(Parker Hannifin)公司的高级热力系统业务部(美国印第安纳州,New Haven www.powerelectronicscooling.com)开发出一种两相冷却系统,据称可以提供相当于其它冷却设备两倍的功率密度,而其占地面积仅为其它产品的一半。

派克汉尼芬公司气候和工业控制部业务开发专员Dale Thompson解释说,这款两相冷却系统根据蒸发潜热原理制成,他说:“这种冷却流程一般用于冷冻和空调技术,不是什么新科学。我们运用这方面的知识,将该技术用于全新的应用领域。”

与硅片相连的热传导组件称为冷板,由一系列微型通道组成。可蒸发的电解质或绝缘性液体流经系统,汽化变为气体。液体以泡沫状两相混合物的形态经冷板离开微型通道。冷却流程无需流经通道的液体吸收热量——这个流程称为显热。这些液体通过蒸发潜热由液态变为气态,约可比单相系统多吸收两至四倍的热量。

Thompson表示传统冷却系统利用依靠显热传导的原理,他说:“尽管这种解决方案的确可行,但捕获热量时需要使用更多的水或冷却器,以便在水和设备之间形成较大热容量。”这样就会产生一些问题,他对此补充道,“由于能达到的液体体积存在实际限制,因此设计工程师希望得到的效果和热封套中的实际散热效果之间存在着微妙的平衡。”

Thompson预计大量医疗器械和组件可以通过派克汉尼芬公司的冷却系统获益,包括用于肿瘤治疗的直线加速器、激光系统、图像处理器、电子显微镜、放大器、电源和X射线管件。他解释说:“医疗器械中的电子元件不仅复杂而且昂贵,同时漏水会对其造成严重破坏。”使用电解液的好处是不会与这些元件发生反应;在环境压力下,这些电解液会变成气体,因而不会对元件造成损坏。此外,两相系统是一种类似于冷冻器的密封组件,因此无需维护。Thompson还补充说,由于能有效捕获并传输热量,因此采用这种冷却系统的MRI或CAT系统可能无需冷却器。


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