Research on Heat Dissipation Performance and Long-term Reliability of the Flapping Wing Cooling Technology Applied to the 5G Communications Equipment

2021 ◽  
Author(s):  
Yanhua Guo ◽  
Xianming Zhang ◽  
Daiyan Lan ◽  
Yue Zhu
Keyword(s):  
Heat Dissipation ◽  
Flapping Wing ◽  
Cooling Technology

Experimental Study on Natural Convection From Vertical Cylinders With Branched Fins

2013 ◽  
Author(s):  
Kuen Tae Park ◽  
Byeongdong Kang ◽  
Hyun Jung Kim ◽  
Dong-Kwon Kim
Keyword(s):  
Natural Convection ◽  
Heat Dissipation ◽  
Electronic Devices ◽  
Heat Sinks ◽  
Electronic Systems ◽  
Electronic Components ◽  
Cooling Systems ◽  
Cooling Technology ◽  
Vertical Cylinders

Advances in semiconductor technology and trends in slim and light electronic systems have led to a significant increase in heat dissipation density of the electronic devices. Therefore, effective cooling technology is essential for reliable operation of electronic components. Among various cooling systems, natural convection heat sinks have been proven to be appropriate because of their inherent simplicity, reliability, and low long-term cost. The present study is focused on natural convective heat transfer from the cylindrical heat sink. Especially, the branched fins, which are motivated by the branched design of nature shown in trees and lungs, are used. The heating power and surface temperature are measured for various types of branched fins and numbers of fins. The result showed that the branched fin dissipates 20% more heat compared to the normal plate fins. Therefore, heat sinks with branched fins have a potential as a next-generation cooling device.

Bio-inspired Passive Skin Cooling for Handheld Microelectronics Devices

2012 ◽  
Vol 134 (1) ◽  
Author(s):  
Zhi Huang ◽  
Xinsheng Zhang ◽  
Ming Zhou ◽  
Xiaoding Xu ◽  
Xianzheng Zhang ◽  
...  
Keyword(s):  
Heat Dissipation ◽  
Handheld Devices ◽  
Solution Temperature ◽  
Passive Cooling ◽  
Temperature Sensitive ◽  
Operation System ◽  
Critical Solution Temperature ◽  
Handheld Device ◽  
Skin Cooling ◽  
Cooling Technology

Increasing functionality demands more heat dissipation from the skin of handheld devices. The maximum amount of heat that can be dissipated passively, prescribed by the natural convection and blackbody radiation theories, is becoming the bottleneck. In this letter, we propose a novel bio-inspirited technique that may overcome this passive cooling limit. It is made possible by using a biomimetic skin capable of perspiration on demand. The key component of the biomimetic skin is a thin layer of temperature sensitive hydro gel (TSHG). The TSHG layer can sweat the skin with moisture when the skin temperature is higher than the TSHG’s lower critical solution temperature (LCST), and thus boost the heat dissipation rate through evaporation. The TSHG layer can absorb moisture at low temperature to replenish. With this novel passive cooling technology, a handheld device can have nearly four times more power beyond the traditional passive cooling limit, and may be powerful enough to run a desktop operation system like a full functional personal computer.

Design and Application of Innovative 3DVC in AI Server System

2021 ◽  
Author(s):  
Xianguang Tan ◽  
Yongzhan He ◽  
Bin Liu ◽  
Jiang Yu ◽  
Ahuja Nishi ◽  
...  
Keyword(s):  
Artificial Intelligence ◽  
Cloud Computing ◽  
Power Consumption ◽  
Heat Dissipation ◽  
Air Cooling ◽  
Computing Power ◽  
Advanced Phase ◽  
Cooling Technology ◽  
Saving Effect ◽  
Server System

Abstract With the accelerated application of cloud computing and artificial intelligence, the computing power and power consumption of chips are greatly enhanced, which brings severe challenges to heat dissipation. Based on this, Baidu has adopted advanced phase change cooling technology and successfully developed an innovative 3dvc air cooling scheme for AI server system. This paper introduces the design, test and verification of the innovative scheme in detail. The results show that the scheme can reduce the GPU temperature by more than 5 °C compared with the traditional heat pipe cooling scheme, save 30%+ of the fan power consumption, and achieve good cooling and energy saving effect.

scholarly journals Wearable thermoelectrics for personalized thermoregulation

2019 ◽  
Vol 5 (5) ◽  
pp. eaaw0536 ◽  
Author(s):  
Sahngki Hong ◽  
Yue Gu ◽  
Joon Kyo Seo ◽  
Joseph Wang ◽  
Ping Liu ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Lower Energy ◽  
Coefficient Of Performance ◽  
Entire Space ◽  
Human Comfort ◽  
Cooling Performance ◽  
Cooling Technology ◽  
High Flexibility ◽  
Novel Design

Thermoregulation has substantial implications for energy consumption and human comfort and health. However, cooling technology has remained largely unchanged for more than a century and still relies on cooling the entire space regardless of the number of occupants. Personalized thermoregulation by thermoelectric devices (TEDs) can markedly reduce the cooling volume and meet individual cooling needs but has yet to be realized because of the lack of flexible TEDs with sustainable high cooling performance. Here, we demonstrate a wearable TED that can deliver more than 10°C cooling effect with a high coefficient of performance (COP > 1.5). Our TED is the first to achieve long-term active cooling with high flexibility, due to a novel design of double elastomer layers and high-ZT rigid TE pillars. Thermoregulation based on these devices may enable a shift from centralized cooling toward personalized cooling with the benefits of substantially lower energy consumption and improved human comfort.

Long-Term Evolution of SCD-1 Satellite Temperatures Based on Comparative Analysis of Telemetric Data Measured in Orbit

2016 ◽  
Vol 138 (7) ◽  
Author(s):  
Andreia F. S. Genaro ◽  
Ezio C. Garcia ◽  
Issamu Muraoka ◽  
Kevin E. de Conde
Keyword(s):  
Mathematical Model ◽  
Thermal Behavior ◽  
Heat Dissipation ◽  
Solar Spectrum ◽  
Temperature Sensitive ◽  
Term Evolution ◽  
Optimization Routine ◽  
Experimental Values ◽  
The Mathematical Model

This paper presents results of the research investigation regarding the causes for temperature variation of the SCD-1 (data-collection satellite) by analyzing its thermal behavior evolution throughout 13 years in orbit. SCD-1, the first satellite designed and built in Brazil, was launched in 1993 and is still in operation. A mathematical model has been developed to simulate thermal behavior of SCD-1 in orbit, which was used as a working tool during project design phase, and is presented here. Temperatures of SCD-1 in orbit have been monitored and recorded in the Control and Tracking Center (São José dos Campos, SP, Brazil) since its launch. An analysis carried out at the mission’s beginning showed that all the temperatures were within the ranges predicted in model. Over the years, the battery, which is the most temperature-sensitive equipment in the satellite, had an increase in temperature approaching upper limit. A method has been developed to investigate the causes of this upswing in which an optimization routine linked to the mathematical model corrects a selected set of parameters in order to adjust the theoretical temperature values to the experimental values. By means of this methodology, data from SCD-1 were analyzed from 1995 to 2005 period and it was concluded that the rise in temperature was caused by an increase in internal battery heat dissipation and absorptivity in solar spectrum of some of the external satellite shielding, both consequences of a long-term degradation.

Biomimetic Passive Skin Cooling for High-End Handheld Devices

2009 ◽  
Author(s):  
Xinsheng Zhang ◽  
Ming Zhou ◽  
Zhi Huang ◽  
Xiaoding Xu ◽  
Xianzheng Zhang ◽  
...  
Keyword(s):  
Heat Dissipation ◽  
Handheld Devices ◽  
Solution Temperature ◽  
Passive Cooling ◽  
Temperature Sensitive ◽  
Operation System ◽  
Critical Solution Temperature ◽  
Handheld Device ◽  
Skin Cooling ◽  
Cooling Technology

Increasing functionality demands more heat dissipation from the skin of handheld microelectronics devices. The maximum amount of heat that can be dissipated passively, prescribed by the natural convection and blackbody radiation theories, is becoming the bottleneck. In this paper, we propose a novel technique that may overcome this passive cooling limit. It is made possible by using a biomimetic skin capable of perspiration on demand. The key component of the biomimetic skin is a thin layer of temperature sensitive hydro gel (TSHG). The TSHG layer can sweat the skin with moisture when the skin temperature is higher than the TSHG’s lower critical solution temperature (LCST), and thus boost the heat dissipation rate through evaporation. The TSHG layer can be refilled by absorbing the moisture in air when the device batteries are being recharged. A generic practice of this novel cooling technique with preliminary analysis and experimental results is presented. With this novel passive cooling technology, a handheld device can be powered 2–4.8 times higher, and may be powerful enough to run a desktop operation system like a personal computer.

Dynamic Loads and Strength Requirements for Flapping Wing

2007 ◽  
Vol 348-349 ◽  
pp. 945-948 ◽  
Author(s):  
Peter Dabnichki ◽  
Marco La Mantia
Keyword(s):  
Wind Tunnel ◽  
Computer Program ◽  
Potential Flow ◽  
Hybrid Vehicle ◽  
Flapping Wing ◽  
Dynamic Loads ◽  
Experimental Simulation ◽  
Current Analysis ◽  
Harmonic Motion

The study is part of a wider biomimetic investigation focusing on flapping wing in water - penguin wing. The long-term aim is to design a hybrid vehicle capable of flying in fluids with very different densities. The paper analyses the dynamic loads on an oscillating wing used for obtaining the trust generated throughout harmonic motion. The strength requirements for such wing have not been analysed up to now and this study is to be followed shortly by experimental simulation in a wind-tunnel. The acting forces in the current analysis were obtained through a potential flow based panel method computer program.

Development of Air Cooled Combustor for Mitsubishi G Class Gas Turbine

2010 ◽  
Author(s):  
Keizo Tsukagoshi ◽  
Hisato Arimura ◽  
Katsunori Tanaka ◽  
Koichi Nishida ◽  
Testu Konishi ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Combined Cycle ◽  
Inlet Temperature ◽  
Air Cooling ◽  
Turbine Inlet Temperature ◽  
Steam Cooling ◽  
Cooling Technology ◽  
Verification Test

Mitsubishi Heavy Industries (MHI) pioneered the introduction of steam cooling technology for gas turbines with the introduction of the M501G in 1997. To date, 62 Mitsubishi G units have been sold making this series the largest steam cooled fleet in the market. The turbine inlet temperature (TIT) for this gas turbine is 1500 deg. C. The original M501G has been upgraded for air cooling applications. This upgraded version is called as M501GAC (G Air Cooled). Several Dry Low NOx (DLN) and cooling technologies from existing F and G series were applied to the upgraded M501GAC. The new GAC combustor was installed in the in-house verification Combined Cycle Power Plant, called T-Point, and verification tests of the combustor were conducted from November 2008. The air cooled M501GAC combustor demonstrated less than 15ppm NOx operation, stable combustor dynamics at all load levels, and high combustor ignition reliability making it suitable for daily start and stop operation at T-Point. Long term verification test is currently under way.

scholarly journals Application of Evaporative Cooling Technology in Transformer for Mine Tunnels

Processes ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 875
Author(s):  
Hualin Shi ◽  
Bin Xiong ◽  
Xiangrong Liu ◽  
Kangjie Huang ◽  
Xinhua Cai ◽  
...  
Keyword(s):  
Life Cycle Cost ◽  
Heat Dissipation ◽  
Short Circuit ◽  
Evaporative Cooling ◽  
Three Dimensional ◽  
Economic Benefits ◽  
High Loss ◽  
Ventilation Condition ◽  
Environmental Requirements ◽  
Cooling Technology

The traditional dry-type mine transformer has some disadvantages, such as incomplete fire prevention, large volume, high loss and not enough environmental protection. Based on evaporative cooling technology, this paper proposes a scheme of mine transformer using fluorocarbon as coolant which can truly realize the incombustible transformer scheme and meet the strict environmental requirements. The transformer adopts three-dimensional wound core structure to reduce the loss and improve the anti-short-circuit ability. The volume of transformer is greatly reduced due to the efficient heat dissipation ability of evaporative cooling technology. The scheme of plate fin heat exchanger is more suitable for the ventilation condition of the mine. The filling technology is used to reduce the amount of expensive coolant. Through the life cycle cost analysis, evaporative cooling transformer has better economic benefits than traditional mine transformer, but also has better safety benefits. A prototype is manufactured and tested, and the results show that the prototype meets the requirements of IEC standard temperature rise limit and achieves the expected requirements.

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