Thinner Thermal Solution Module by Combination of Thin Heat Pipe and Piezo Fan

2011 ◽  
Author(s):  
Ahmad Jalilvand ◽  
Masataka Mochizuki ◽  
Yuji Saito ◽  
Yoji Kawahara ◽  
Vijit Wuttijumnong ◽  
...  
Keyword(s):  
Heat Pipe ◽  
Performance Test ◽  
Acoustic Noise ◽  
Test Results ◽  
Cooling Device ◽  
Heat Spreader ◽  
Cooling Fan ◽  
Thermal Solution ◽  
New Type ◽  
Cooling Module

A high-density and slim-type packaging technology in a notebook PC or a handheld PC has been developed as the importance of portability is increased more and more recently. The heat generated in small-sized electronic units should be dissipated effectively for operational stability during system lifetime. Considering the technical trend for miniaturized packaging of components, which requires very limited space, installed in the system; it is inevitable to develop and apply a micro-cooling device. In the present study, a very thin cooling device which operates on the basis of piezoelectricity has been introduced. First, the operation principal of Piezo fan is explained and then this new type of Piezo fan is introduced. Performance test results on thin laptop thermal solution module combined with this new Piezo fan is investigated. The original thermal solution module was composed of thin heat spreader (1 mm thick) and thin heat pipe (less than 2 mm) with finned heat sink at the condenser cooled by mini cooling fan (brushless mini fan). The mini fan is replaced by this new type of much thinner Piezo fan and then performance is studied and the results are compared with thin cooling module when cooled by mini cooling fan. In addition, this work consists of various developments that have been conducted to improve the performance of this Piezo fan that includes enhancement of cooling performance and reduction of acoustic noise.

Thermal Performance of Integrated Plate Heat Pipe With a Heat Spreader

2000 ◽  
Vol 123 (3) ◽  
pp. 189-195 ◽  
Author(s):  
Koichiro Take ◽  
Ralph L. Webb
Keyword(s):  
Heat Pipe ◽  
Thermal Contact ◽  
Heat Pipes ◽  
Passive Cooling ◽  
Test Results ◽  
Air Flow Rate ◽  
Heat Spreader ◽  
Plate Heat ◽  
Cooling Method ◽  
Notebook Computers

The air flow rate available for cooling of notebook computers is very limited. Thus, notebook computer manufacturers desire a “passive” cooling method. Heat pipes are typically used to transport the heat from the CPU to a forced convection, air-cooled condenser. This paper describes a passive, keyboard sized aluminum Integrated Plate Heat Pipe (IP-HP) that has been developed for notebook computers. Analysis was performed to estimate the several thermal resistances in the heat pipe, including the effect of the vapor pressure drop. The modified design using a heat spreader at the evaporator significantly reduces the heat pipe resistance. Further work was done to evaluate the thermal contact resistance at the IP-HP/CPU interface. Test results show that the IP-HP can reject 18 W while maintaining the CPU 65°C above ambient temperature.

LOOP HEAT PIPE FOR SPACECRAFT THERMAL CONTROL: THERMO VACUUM PERFORMANCE TEST RESULTS

2018 ◽  
Author(s):  
Jasvanth V S ◽  
Srikanth T ◽  
Abhijit A. Adoni ◽  
Jaikumar V ◽  
Amrit Ambirajan
Keyword(s):  
Heat Pipe ◽  
Performance Test ◽  
Thermal Control ◽  
Loop Heat Pipe ◽  
Test Results ◽  
Spacecraft Thermal Control

Visualization of oil spill at sea surface based on texture projection

2017 ◽  
Vol 08 (02) ◽  
pp. 1750060
Author(s):  
Changjun Zou ◽  
Yong Yin ◽  
Xiuwen Liu ◽  
Haijiang Li
Keyword(s):  
Oil Spill ◽  
Performance Test ◽  
Sea Surface ◽  
Dynamic Visualization ◽  
Test Results ◽  
Validity And Reliability ◽  
Smoothing Filter ◽  
New Type ◽  
Smooth Convergence ◽  
Drilling System

In view of the merits and demerits of current oil spill visualization methods, the paper involves a study on a new type of visualization approach targeting oil spill at sea. To be specific, the visualization of sea oil spill is implemented with the adoption of texture projection method. The texture projection-induced jaggedly edge is displayed in the performance test results. Under the circumstance, Gauss smoothing filter is introduced to secure the smooth convergence of texture edge and thus bring forth satisfactory dynamic visualization effect. Already, this means has already been successfully applied to the Oil Spill Emergency 3D Drilling System, which evidenced the validity and reliability of the new method.

Research on Speed Control Model with Temperature in Hydraulically-Driven Cooling Fan

2013 ◽  
Vol 850-851 ◽  
pp. 350-354
Author(s):  
Yang Wu ◽  
Si Cheng Qin ◽  
Xue Lin Zhang ◽  
Xin Feng ◽  
Bin Bin Chen
Keyword(s):  
Heat Dissipation ◽  
Performance Test ◽  
Static Pressure ◽  
Cooling Power ◽  
Cooling Fan ◽  
Cooling Module ◽  
Fan Speed ◽  
And Performance ◽  
Dissipation Power ◽  
The Mathematical Model

In order to obtain excellent cooling module, it is necessary to make air flow flowing into the radiator vary with ambient temperature. Cooling fan speed must vary with cooling power continuously. In this paper, the relation was obtained between fan speed and flow, static pressure, torque, power based on calculation and performance test data related to cooling fan. The mathematical model between fan speed and heat dissipation power in cooling module was deduced. Driving characteristics of cooling fan were analyzed.

Experimental and Numerical Studies of the Thermal Hinge in a Notebook Computer

2003 ◽  
Author(s):  
Tarek Jamal-Eddine ◽  
Lawrence Mok
Keyword(s):  
Numerical Model ◽  
Heat Pipe ◽  
Thermal Performance ◽  
Acoustic Noise ◽  
Liquid Crystal Display ◽  
Thermal Contact ◽  
Metal Plate ◽  
Heat Spreader ◽  
Notebook Computer ◽  
Rotational Part

The power of semiconductor chips, especially the CPU chip used in the notebook computer, is increasing nowadays while the size of the computer box is decreasing. To cope with this ever-increasing heat load within the notebook computer, many design engineers tend to use bigger heat sinks and fans. However, these approaches add weight, acoustic noise, and power consumption to the computer, none of which is desirable. A method of transferring heat from a CPU chip to the backside of the liquid-crystal display (LCD) and letting heat dissipate into the surroundings has been explored before. This is sometimes called the thermal hinge method since heat is transferred across the hinge of a notebook computer. In this paper, the structure of a new thermal hinge and its thermal performance will be revealed. This new thermal hinge has two main parts: one is the base, which is stationary and which has a heat pipe connected to a metal plate on top of a CPU chip, and the other is the rotational part, which is mounted on the LCD cover with a heat pipe connected to a heat spreader. The base is supported by a set of springs to ensure that the base is always in good thermal contact with the rotational part of the hinge. This spring-loaded thermal hinge using an aluminum heat spreader on a plastic LCD cover was built and tested and the results were compared with a numerical model that was constructed using a commercially available CFD code. The results from the experiments and numerical modeling agree reasonably well. Because of this, the numerical model has been used to optimize the hinge structure. The effects of the size, thickness, and materials of the heat spreader as well as the materials of the LCD cover on the hinge thermal performance have been studied and will be discussed.

Analysis on Characteristics of Heavy Vehicle Electrical Cooling Fan with CFD and Motor Test Results

2011 ◽  
Vol 110-116 ◽  
pp. 4684-4690
Author(s):  
Joo Han Kim ◽  
In Soung Jung ◽  
Nahmkeon Hur ◽  
Wook Kim
Keyword(s):  
Boundary Condition ◽  
Performance Test ◽  
Fuel Efficiency ◽  
Design Stage ◽  
Heavy Vehicle ◽  
Test Results ◽  
Rotating Speed ◽  
Cooling Fan ◽  
Motor Test ◽  
Cfd Method

Heavy vehicle cooling fan is seen as one of the main means of vehicular fuel efficiency reduction. This is becoming a major factor in city noise, and the necessity of electromagnetic technical development is very great. CFD method could replace experiment for development of heavy vehicle cooling fan, but it cannot be applicable to some of real design stage because of limitation that rotating speed must be set as boundary condition. In this article, we developed a new algorithm in which we are able to determine both static pressure and rotating speed through setting up the only voltage as a boundary condition with motor performance test results

NUMERICAL AND EXPERIMENTAL INVESTIGATION ON A NEW TYPE ELECTRICAL HEAT STORAGE BASED ON FLAT MICRO HEAT PIPE

2018 ◽  
Author(s):  
Zeyu Wang ◽  
Yanhua Diao ◽  
Yaohua Zhao ◽  
Chuanqi Chen ◽  
Lin Liang ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Heat Pipe ◽  
Heat Storage ◽  
Micro Heat Pipe ◽  
New Type

Flight test results for a high-capacity single-groove heat pipe

1992 ◽  
Author(s):  
J. AMBROSE ◽  
H. HOLMES ◽  
R. CIMA ◽  
M. KAPOLNEK
Keyword(s):  
Heat Pipe ◽  
High Capacity ◽  
Flight Test ◽  
Test Results

PENGARUH MODEL PEMBELAJARAN KELILING KELOMPOK (ROUND CLUB) TERHADAP KETERAMPILAN MENULIS LAPORAN PERJALANAN SISWA KELAS V SDN 01 NAGARI BUKIK SIKUMPA

2020 ◽  
Author(s):  
Wirda Linda
Keyword(s):  
Standard Deviation ◽  
Performance Test ◽  
Writing Skills ◽  
Learning Model ◽  
Homogeneity Test ◽  
Test Results ◽  
Class V ◽  
Average Value ◽  
Normality Test ◽  
Lecture Method

This research is motivated by the low desire of students in writing travel reports. The lack of students' knowledge of the report concept, the lack of students' knowledge of the 5W + 1H report points of good and correct language, the lack of students' knowledge of the spatial, time and topic pattern and not yet reached KKM 75. The method used by the teacher has not been interesting, lecture method. The purpose of this study is to describe the skills of writing travel reports by using Round Club learning model which is viewed from the aspect of understanding the report concept, the use of 5W +1H report points, the spatial, time, and topic pattern.The population of this study is the students of class V Lessons Year 2017/2018 which amounted to 2 classes with the number 80. The sample of research as much as two classes taken by the sample of propotional.Class V.1 as experimental class and class V.2 as control class. The research instrument used is performance test. Provide an assessment by specifying the subject of the 5W + 1H report, as well as the spatial, time and topic pattern. Data were analyzed by 't' test by first testing normality, homogeneity, and hypothesis testing.The results showed that the average control class 68 with more than enough qualifications with standard deviation 16.96. 83 experimental class with good qualification and standard deviation of 15.42 and there is a significant influence on the result of writing skill of class V SDN 01 Nagari Bukik SikumpaSubdistrict, Lima Puluh Kota. This is evidenced by the average value of writing skills in the experiment class higher than the average value in the control class. Normality test results indicate that the two sample classes of  Lo  values in the control class -0.2141 are smaller than the normal 0.190 Lt distributed. Homogeneity test results that the variation of this study is homogeneous at a real level of 0.05, because Ftable 2.16 > Fhitung 1.21 and the results of data analysis then obtained = 2.78 > 1.70 t table, so H0 rejected and H1 accepted. It can be concluded that there is Influence. Using  Learning  Model of Student Group Writing  Skills Travel Report of students of class V SDN 01 Nagari Bukik Sikumpa Subdistrict, Kabupaten Lima Puluh Kota.KeyWords: model pembelajaran round club, menulis laporan perjalanan.

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