先进环路热管技术

Loop heat pipes were first investigated and patented in the USSR in 1974 by Maydanik et al . The patent for LHPs was filed in the USA in 1985（俄罗斯科学家）.
1mm 厚环路热管
UCAS 专利超薄环路热管
其它应用
• • • • 太阳能热利用环路热管 太 能热利 路热管； 笔记本微型环路热管； 飞行器可变加速度负载下的LHP; 以上为在研项目。
主要参考文献
• • • J Li et t al, l P Performance f Investigation I ti ti of f a Compact C t Loop L H Heat t Pi Pipe with ith P Parallel ll l Condensers, Experimental Thermal and Fluid Science, Vol.62, pp.40-51, 2015. J Li et al, A Loop-heat-pipe Heat Sink with Parallel Condensers for High-power Integrated LED Chips Chips, Applied Thermal Engineering, Vol.56, Vol 56 pp pp.18-26, 18-26 2013 2013. J Li et al, A Compact Loop Heat Pipe for High Power Chip Cooling, IEEE Transactions on Components, Packaging and Manufacturing Technology, Vol.1, No.4, , pp.519-527, pp , 2011. J Li et al, 3D Heat Transfer Analysis in a Loop Heat Pipe Evaporator with a Fully Saturated Wick, International Journal of Heat and Mass Transfer, Vol.54, pp.564-574, 2011. J Li et al, Experimental Studies on a High Performance Compact Loop Heat Pipe with a Square Flat Evaporator, Applied Thermal Engineering, Vol.30, pp.741-752,2010. Ji Li et al, Experimental study on heat transfer capability of a miniature loop heat pipe, i IMECE2016 IMECE2016-66566, 66566 Proceedings P di of f the th ASME 2016 International I t ti lM Mechanical h i l Engineering Congress and Exposition, November 11-17, 2016, Phoenix, Arizona, USA. Ji Li et al al, An ultra-thin ultra thin miniature loop heat pipe cooler for mobile electronics, Applied Thermal Engineering, 2016 (in press).
先进环路热管技术简介 L Loop H t Pipe Heat Pi
李骥 先进热管理技术实验室 中国科学院大学工学院
大纲
• 环路热管原理； • 基础研究； 基础研究 • 应用。 应用
以下内容皆为中国科学院大学所有，未经允许，不得转载转发仿制。
环路热管原理
– – – –
Condenser Vapor Line Liquid Line Evaporator
100W, 总热阻0.3 K/W， 散热器重量1.2kg
双冷凝器LED 环路热管自然对流散热器 0.6kg 6mm管路
Air Natural Convection
Power Electronics LHP 1000W-2000W 4组120风扇 6mm管路
系统热阻
移动电子设备
• • • • 智能手机 智能 机； 平板电脑； 超薄笔记本； 等
Applications应用
• • • • • • Desktop CPU台式机; All-In-One All In One CPU一体机 体机; LED照明; Power Electronics电力电子; 移动电子设备； et al
Desktop p LHP 90风扇，4mm管路
15CF M
不同散热技术之间优缺点比较
• • • 金属散热器
Pros: cheap; highest reliability Cons: heavy; high thermal resiatance
普通热管散热器
Pros: lower thermal resistance;reliable C Cons: C Complicated; li t d not t flexible fl ibl
30CF M
Spec.: 350W, 总热阻0.17 K/W at 30CFM
All-in-one All in one LHP 双Blower, 4mm管路
Spec.: 300W 总热阻0.24 300W, 0 Biblioteka Baidu4 K/W at 10CFM
（9.75CFM 9 75CFM）
LED LHP环路热管自然对流散热器 6mm管路
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Thanks for your attention!
结论：环路热管具有高热流密度、高负载、 低热阻的系统性能，可靠性与普通热管相同。
基础研究
Evaporator Structure
Sintered Wick
An unique LHP Evaporator
Visualization of Evaporation
Condenser Effectiveness
微结构液冷散热器
Pros: highest thermal capacity; lowest thermal resistance C Cons: expensive; i complicated; li t d not t reliable; li bl
• 环路热管散热器
Pros: ( (i) ) very y high g capacity p y comparable p to liquid q cooling; g; (ii) ( ) efficient operation at any orientation in the gravity field; (iii) a very low system thermal resistance; (iv) flexibility in packaging; (v) high heat transfer loads over considerable distance; (vi) very useful f l to t manage hot h t spots t as a vapor chamber; h b (vii) ( ii) very reliable; li bl (viii) economic. Cons: for low power, thermal resistance is not quite low.
IR Temperature Measurement
Condenser St t Structure
Test Bench
yyyy/mm/dd Owner
测试结果
R Tcase Tamb Q
测试条件 条件：120mm Fan 3200RPM
系统热阻
理论与实验的比较
在国际上，该蒸发器之热阻-热流密度关系处于领先水平。