scholarly journals DESAIN PASSIVE COOLING MENGGUNAKAN PERFORATED ALUMINUM PLATE PADA FOTOVOLTAIK MONOKRISTALLIN

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Armin As Sofijan
Keyword(s):  
Free Convection ◽  
Heat Sink ◽  
Force Convection ◽  
Aluminum Plate ◽  
Passive Cooling ◽  
Active Cooling ◽  
Cooling Fan

Konversi energi Matahari menjadi energi listrik menggunakam Photovoltaic Monocrystallin modul merupakan pembangkit listrik alternatip yang bebas polusi dan ramah lingkungan. Indonesia merupakan daerah subtropis yang kaya akan cahaya Matahari, merupakan bahan baku utama PV. Proses konversi energi pada PV sangat dipengaruhi oleh peningkatan temperatur yang melebihi ambang batas, akan menyebabkan penurunan efisiensi PV. Peningkatan efisiensi PV ini sudah banyak dilakukan peneliti dari berbagai negara, penelitian yang terdahulu lebih banyak menggunakan methoda force convection ( konveksi paksa ) atau active cooling dengan menambahkan cooling fan, spray water, heat sink yang membutuhkan energi tambahan, permasalahan yang timbul bagaimana meningkatkan efisiensi fotovoltaik tanpa menambahkan energi tambahan?. Pada penelitian ini peningkatan efisiensi PV menggunakan metoda free convection atau passive cooling, mendesain perforated aluminum plate yang dipasang disebelah bawah panel PV dengan mendesain hole yang bervariasi dari diameter 15mm dan berjarak 20 mm. Ide penelitian ini merupakan sesuatu yang baru dan mempunyai suatu kontribusi terhadap ilmu pengetahuan, sehingga sangat perlu untuk dilakukan penelitian ini dalam mengembangkan teknologi baru dan terbarukan.

Avionics Passive Cooling With Microencapsulated Phase Change Materials

1998 ◽  
Vol 120 (3) ◽  
pp. 238-242 ◽  
Author(s):  
A. J. Fossett ◽  
M. T. Maguire ◽  
A. A. Kudirka ◽  
F. E. Mills ◽  
D. A. Brown
Keyword(s):  
Phase Change ◽  
Weight Reduction ◽  
Heat Sink ◽  
Phase Change Materials ◽  
Aluminum Plate ◽  
Passive Cooling ◽  
Design Problems ◽  
Solid Aluminum ◽  
Microencapsulated Phase Change Materials ◽  
Good Agreement

Analysis for an avionics application typical of remotely located, intermittently operated avionics on aircraft and missiles show that a large weight reduction (about 9:1) can be obtained by using recently developed microencapsulated phase change materials technology instead of a solid aluminum plate for a passive heat sink. Tests with a configuration based on the typical avionics application used for analysis show good agreement with analysis. Use of microencapsulated rather than bulk phase change materials avoids a number of design problems previously encountered with application of such materials.

Flow and Heat Transfer around Finned-Heat Sink in Electronic Enclosure with Axial Cooling Fan

2012 ◽  
Vol 2 (2) ◽  
Author(s):  
Takashi Fukue ◽  
T. Hatakeyama ◽  
Masaru Ishizuka ◽  
S. Nakagawa ◽  
K. Koizumi ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Sink ◽  
Cooling Fan ◽  
Flow And Heat Transfer

Pin-Fin Heat Sink With Horizontal Base and Blocked Edges

2008 ◽  
Author(s):  
D. Sahray ◽  
H. Shmueli ◽  
N. Segal ◽  
G. Ziskind ◽  
R. Letan
Keyword(s):  
Heat Transfer ◽  
Free Convection ◽  
Contact Resistance ◽  
Cross Section ◽  
Heat Input ◽  
Heat Sink ◽  
Numerical Study ◽  
Heat Sinks ◽  
Transfer Enhancement ◽  
Pin Fin

In the present work, horizontal-base pin fin heat sinks exposed to free convection in air are studied. They are made of aluminum, and there is no contact resistance between the base and the fins. For the same base dimensions the fin height and pitch vary. The fins have a constant square cross-section. The edges of the sink are blocked: the surrounding insulation is flush with the fin tips. The effect of fin height and pitch on the performance of the sink is studied experimentally and numerically. In the experiments, the heat sinks are heated using foil electrical heaters. The heat input is set, and temperatures of the base and fins are measured. In the corresponding numerical study, the sinks and their environment are modeled using the Fluent 6 software. The results show that heat transfer enhancement due to the fins is not monotonic. The differences between sparsely and densely populated sinks are analyzed for various fin heights. Also assessed are effects of the blocked edges as compared to the previously studied cases where the sink edges were exposed to the surroundings.

scholarly journals Cooling Performance of Heat Sinks Used in Electronic Devices

2018 ◽  
Vol 171 ◽  
pp. 02003
Author(s):  
Ibrahim Mjallal ◽  
Hussein Farhat ◽  
Mohammad Hammoud ◽  
Samer Ali ◽  
Ali AL Shaer ◽  
...  
Keyword(s):  
Heat Sink ◽  
Electronic Devices ◽  
Heat Fluxes ◽  
Electronic Cooling ◽  
Heat Sinks ◽  
Passive Cooling ◽  
Short Term ◽  
Cooling Systems ◽  
Thermal Output ◽  
Electrical Devices

Existing passive cooling solutions limit the short-term thermal output of systems, thereby either limiting instantaneous performance or requiring active cooling solutions. As the temperature of the electronic devices increases, their failure rate increases. That’s why electrical devices should be cooled. Conventional electronic cooling systems usually consist of a metal heat sink coupled to a fan. This paper compares the heat distribution on a heat sink relative to different heat fluxes produced by electronic chips. The benefit of adding a fan is also investigated when high levels of heat generation are expected.

scholarly journals Active cooling photovoltaic with IoT facility

2021 ◽  
Vol 12 (3) ◽  
pp. 1494
Author(s):  
Muhammad Nizam Kamarudin ◽  
Sahazati Md. Rozali ◽  
Mohd Saifuzam Jamri
Keyword(s):  
Real Time ◽  
Cooling System ◽  
Solar Panel ◽  
State Of Charge ◽  
Photovoltaic System ◽  
Passive Cooling ◽  
Active Cooling ◽  
Passive Cooling System ◽  
Pv Power Generation ◽  
Sunlight Intensity

Harvesting energy from the sun makes the photovoltaic (PV) power generation a promising technology. To obtain a consistent state of charge (SOC), consistent energy must be harvested and efficiently directed to the battery. Overcharging or undercharging phenomena decreases the lifetime of the battery. Besides, the effect of irradiance toward solar in term of sunlight intensity effects the efficiency and hence, sluggish the SOC. The main problem of the solar panel revealed when the temperature has increased, the efficiency of solar panel will also be decreased. This manuscript reports the finding of developing an automatic active cooling system for a solar panel with a real time energy monitoring system with internet-of-things (IoT) facility. The IoT technology assists user to measure the efficiency of the solar panel and SOC of the battery in real time from any locations. The automatic active cooling system is designed to improve the efficiency of the solar panel. The effectiveness of the proposed system is proven via the analysis of the effect of active cooling toward efficiency and SOC of photovoltaic system. The results also tabulate the comparative studies of active-to-passive cooling system, as well as the effect of cooling towards SOC and efficiency of the solar panel.

Active cooling system for downhole electronics in high temperature environments

2021 ◽  
pp. 1-16
Author(s):  
Wei Minghui ◽  
Cai Wei ◽  
Xu Mingze ◽  
Deng Shuang
Keyword(s):  
High Temperature ◽  
Cooling System ◽  
Capillary Tube ◽  
Thermal Characteristics ◽  
Electric Circuit ◽  
Passive Cooling ◽  
Electronic Components ◽  
Active Cooling ◽  
Temperature Environment ◽  
High Temperature Environment

Abstract Downhole high temperature environment is an important factor affecting the performance of downhole instrument electronic system.At present, various active cooling technologies and passive cooling technologies have been proposed to reduce the temperature of downhole electric circuit system.However, passive cooling technologies can only provide limited cooling capacity for drilling tools under high temperature environment, and the duration of cooling is short, which can not meet the long-time drilling task.This paper presents an Active cooling system(ACS)for downhole electronics and the effects of different temperatures on the performance of electronic components are analyzed.The ACS mainly includes a micro supercharger, condenser tube, evaporation pipe, capillary tube and refrigerant.The theoretical analysis of heat transfer and refrigerant capacity in high temperature environment is carried out.The thermal characteristics of the ACS is evaluated experimentally.The results show that the temperature of electronic components can be reduced to below 163°C in the 200°C downhole environment and components.The geomagnetic field data measured by electronic components at room temperature, 200 °C and with ACS are compared.The results show that ACS can keep electronic components working normally.

The Effect of Orientation on the Performance of Small Free-Convection Heat Sinks for Use With a Thermoelectric Cryotherapy Device

2020 ◽  
Vol 13 (4) ◽  
Author(s):  
Mark Baldry ◽  
Victoria Timchenko ◽  
Chris Menictas
Keyword(s):  
Free Convection ◽  
Heat Sink ◽  
Rapid Development ◽  
Heat Sinks ◽  
Convection Heat ◽  
Pin Fin ◽  
Flat Base ◽  
Free Convection Heat ◽  
Performance Decline ◽  
Metal 3D Printing

Abstract The rapid development of metal 3D printing techniques has enabled the exploration of complex free-convection heat sink designs. Small free-convection heat sinks with pin-fin arrays (or novel geometries) are widely employed at different orientations in a variety of electronic devices, yet there is limited understanding of how orientation impacts their heat transfer behavior. This article characterizes the orientation-dependent performance of a small, tapered pin, free-convection heat sink (named HS17) manufactured with direct metal laser sintering for use with a thermoelectric scalp cryotherapy device for the prevention of chemotherapy-induced alopecia. A validated numerical model and custom-built free-convection test rig were used to investigate the heat sink’s performance over the orientation range of 0 deg to 135 deg. HS17 maintained relatively robust performance over the 0 deg to 90 deg range; however, the thermal resistance (Rth) at 112.5 deg and 135 deg was 6% and 11% higher compared to the 90 deg case, respectively. The heat sink design was modified to include a 22.5 deg wedge base (named HS17-W) to mitigate this performance decline, which is important to ensure safe and continued operation of the cryotherapy device. Compared to the flat base heat sink, the wedge-base design successfully reduced Rth from 11.9 K/W, 12.5 K/W, and 12.8 K/W to 11.5 K/W, 11.8 K/W, and 12.3 K/W at 90 deg, 112.5 deg, and 135 deg, respectively. These results demonstrate the effectiveness of the current proposed design to improve the performance of free-convection heat sinks at downward-facing orientations.

Numerical study of nanocomposite phase change material-based heat sink for the passive cooling of electronic components

2021 ◽  
Author(s):  
Adeel Arshad ◽  
Mark Jabbal ◽  
Hamza Faraji ◽  
Pouyan Talebizadehsardari ◽  
Muhammad Anser Bashir ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Heat Sink ◽  
Numerical Study ◽  
Passive Cooling ◽  
Electronic Components ◽  
Change Material

A Refrigerator without Compressor Powered by Solar Energy

2016 ◽  
Vol 8 (01) ◽  
pp. 06-10
Author(s):  
Ashutosh Rai ◽  
Pankaj Kumar Yadav ◽  
Awdhesh Gupta
Keyword(s):  
Solar Energy ◽  
Heat Sink ◽  
Cooling System ◽  
Electrical Energy ◽  
Aluminum Plate ◽  
Thermoelectric Device ◽  
Thermoelectric Devices ◽  
Cold Side ◽  
Peltier Module ◽  
Very High

Thermoelectric refrigerator with an inner volume of 10 litre (approx.) has been designed and tested, whose cold system is composed of a Peltier and a fan (i.e. heat sink).Analysis of a its performance in different conditions has been carried out with this prototype. Thermoelectric devices are capable of converting electrical energy into thermal heat pumping at a very high efficiency.The cooling system is made up of one thermoelectric device, composed of a Peltier module (40 watt) with its hot side in contact with a heat sink and aluminum plate in contact with the cold side.

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