B244 Liquid Cooling Performance of LSI Packages in Narrow Channel

2006 ◽  
Vol 2006 (0) ◽  
pp. 283-284
Author(s):  
Hitoshi Matsushima ◽  
Hiroshi Fukuda
Keyword(s):  
Narrow Channel ◽  
Liquid Cooling ◽  
Cooling Performance

Enhancement of Central Processing Unit Liquid Cooling Performance Using Hexagonal Boron Nitride Nanofluids

2019 ◽  
Vol 11 (3) ◽  
Author(s):  
Özgür Atik ◽  
Hakan Ertürk
Keyword(s):  
Boron Nitride ◽  
Closed Loop ◽  
Performance Enhancement ◽  
Hexagonal Boron Nitride ◽  
Processing Unit ◽  
Pumping Power ◽  
Liquid Cooling ◽  
Particle Volume ◽  
Cooling Performance ◽  
Central Processing

Cooling performance enhancement of computer liquid cooling (LC) systems using hexagonal boron nitride (hBN)–water nanofluids is investigated experimentally. Particle volume fractions of 0.1–2% are considered at constant flow rates varying from 0.3 to 2 L/min for two different cold plates (CPs), with and without fins. A commercial closed-loop LC system is also tested to examine performance of hBN–water nanofluids at constant pumping power. It was observed that the thermal performance can be improved by using hBN nanofluids, and higher improvements are achieved for systems with limited convection rates.

scholarly journals Liquid Cooling System for CPU by Electroconjugate Fluid

2014 ◽  
Vol 6 ◽  
pp. 126301 ◽  
Author(s):  
Yasuo Sakurai ◽  
Takeshi Nakada ◽  
Kazuya Edamura
Keyword(s):  
Heat Source ◽  
Personal Computer ◽  
Simple Structure ◽  
Cooling System ◽  
Jet Flow ◽  
Liquid Cooling ◽  
Remarkable Property ◽  
Cooling Performance ◽  
Basic Characteristics ◽  
Liquid Cooling System

The dissipated power of CPU for personal computer has been increased because the performance of personal computer becomes higher. Therefore, a liquid cooling system has been employed in some personal computers in order to improve their cooling performance. Electroconjugate fluid (ECF) is one of the functional fluids. ECF has a remarkable property that a strong jet flow is generated between electrodes when a high voltage is applied to ECF through the electrodes. By using this strong jet flow, an ECF-pump with simple structure, no sliding portion, no noise, and no vibration seems to be able to be developed. And then, by the use of the ECF-pump, a new liquid cooling system by ECF seems to be realized. In this study, to realize this system, an ECF-pump is proposed and fabricated to investigate the basic characteristics of the ECF-pump experimentally. Next, by utilizing the ECF-pump, a model of a liquid cooling system by ECF is manufactured and some experiments are carried out to investigate the performance of this system. As a result, by using this system, the temperature of heat source of 50 W is kept at 60°C or less. In general, CPU is usually used at this temperature or less.

scholarly journals Optimization of Thermal Management System with Water and Phase Change Material Cooling for Li-Ion Battery Pack

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5312
Author(s):  
Quanyi Li ◽  
Jong-Rae Cho ◽  
Jianguang Zhai
Keyword(s):  
Service Life ◽  
Thermal Management ◽  
Flow Rate ◽  
Battery Pack ◽  
Liquid Cooling ◽  
Cooling Performance ◽  
Cooling Pipe ◽  
Thermal Management System ◽  
Battery Packs ◽  
Change Material

The cooling structure of a battery pack and coupled liquid cooling and phase change material (PCM) were designed in a thermal management system to enhance the cooling performance and extend the service life of lithium-ion battery packs. Numerical simulations were conducted based on the finite volume method. This study focuses on factors such as the layout of the terminal, flow rate of the coolant, different sections of the cooling pipe, position of the cooling pipe, and coupled liquid cooling, and investigates their influences on the operating temperature. The results show that a reasonable terminal layout can reduce heat generation inside the batteries. The appropriate flow rate and position of the cooling pipe effectively reduced the maximum temperature and minimized energy consumption. Then, the PCM was placed between the adjacent batteries near the outlet to enhance the uniformity of the battery pack. The temperature difference was reduced to near 5 K. This study provides a clear direction for improving the cooling performance and extending the service life of battery packs.

scholarly journals Analysis of Heat Dissipation and Preheating Module for Vehicle Lithium Iron Phosphate Battery

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6196
Author(s):  
Shuwen Zhou ◽  
Yuemin Zhao ◽  
Shangyuan Gao
Keyword(s):  
Ambient Temperature ◽  
Lithium Iron Phosphate ◽  
Great Influence ◽  
Iron Phosphate ◽  
Structure Design ◽  
Simulation Software ◽  
Battery Pack ◽  
Bottom Plate ◽  
Liquid Cooling ◽  
Cooling Performance

The ambient temperature has a great influence on the discharge and charging performance of a lithium battery, which may cause thermal runaway of the battery pack in extreme cases. In terms of the poor cooling effect caused by only using the cooling bottom plate for liquid cooling and the fact that the battery pack needs to be preheated before it can be used normally, a new cooling structure design was carried out, and a variety of cooling schemes and preheating schemes were proposed for analysis and comparison. The Star ccm+ simulation software was used to analyze and study their liquid cooling performance and preheating performance under different conditions. The best cooling scheme and preheating scheme were obtained by comparing the results of the simulation analysis. The simulation results show that the cooling performance of the cooling scheme using two vertical cooling plates and one cooling bottom plate is the best, and the preheating performance is best when the preheating liquid is used with a certain temperature flow through the preheating pipe of the battery pack for a period of time, and then the battery pack is discharged until the battery pack temperature reaches the working temperature range. The research results have reference value for the control of the ambient temperature of a vehicle lithium iron phosphate battery.

Single Phase Liquid Cooling of High Heat Flux Devices with Local Hotspot in a Micro-Gap with Non-Uniform Fin Array

2020 ◽  
Author(s):  
Yuanchen Hu ◽  
Tom Sarvey ◽  
Muhannad Bakir ◽  
Yogendra Joshi
Keyword(s):  
Heat Flux ◽  
Thermal Performance ◽  
Single Phase ◽  
Heat Fluxes ◽  
Thermal Design ◽  
Liquid Cooling ◽  
Cooling Performance ◽  
Pin Fin ◽  
Phase Liquid ◽  
Pin Fin Array

Abstract Single-phase liquid cooling in micro-channels and micro-gaps has been successfully demonstrated for heat fluxes of ~1 kW/cm2 for silicon chips with maximum temperature below 100 °C. However, effectively managing localized hotspots in heterogeneous integration, which refers to the integration of various components that achieve multiple functionalities, entails further thermal challenges. To address these, we use a non-uniform pin-fin array. Single-phase liquid-cooling performance of four silicon test chips, thermal design vehicles (TDVs), each with a non-uniform pin-fin array, are experimentally examined. We evaluate multiple combinations of hotspot and background heat fluxes using four background heaters aligned upstream to downstream, and one additional hotspot heater located in the center. We examine the thermal performance of cylindrical fin-enhanced TDVs and hydrofoil fin-enhanced TDVs, both with two designs: one with increased fin density around the hotspot only, and another with increased fin density spanning the entire width of the channel. The resulting heat flux ratio of the localized hotspot to background heaters varies from 1 to 5. TDVs with spanwise increased hydrofoil fin density (spanwise hydrofoil) exhibit the best thermal performance with 6%-14% lower hotspot temperature than others. TDVs with spanwise increased cylindrical fin (cylindrical spanwise) maintain a balance between hotspot cooling performance and pressure drops. In general, as the temperature of the hotspot remains around 70? with a heat flux of 625 W/cm2, the non-uniform fin-enhanced micro-gaps appears to be a promising hotspot thermal management approach.

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