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Article
Effect of the Circular Perforations on the Heat Transfer Enhancement by the Forced Convection from the Rectangular Fins

Author: Wadhah Hussein Abdulrazzaq Al-Taha وضاح حسين عبد الرزاق الطه
Journal: DIYALA JOURNAL OF ENGINEERING SCIENCES مجلة ديالى للعلوم الهندسية ISSN: 19998716/26166909 Year: 2018 Volume: 11 Issue: 3 Pages: 62-70
Publisher: Diyala University جامعة ديالى

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Abstract

This study aims to investigate the effect of the circular perforation of the rectangular fin on the enhancement of the heat transfer by forced convection. The solid rectangular fin considered as a reference for comparison purpose with the perforated fin. The parameters taken into consideration are thermal properties and geometrical dimensions of the fin and its perforations. The area and heat transfer gain of the perforations fins were considered being the main parameters in this study. The results of this study showed that the heat dissipation was improved when used the perforation fins compared with the equivalent solid fin. The enhancement quantity of the heat dissipation from the fin depends on the thermal conductivity, the perforation dimension, thickness, longitudinal and lateral spacing. Finally, the perforating of the fins enhances the rate of heat dissipation as well as decreases the weight of the fin.


Article
Experimental Study on Solar Air Heating
دراسة تجريبية حول تسخين الهواء بالطاقة الشمسية

Authors: Khaleel I. Abass خليل ابراهيم عباس --- Ali J. Ali علي جلال علي --- Miqdam T Chaichan مقدام طارق جيجان
Journal: Al-Khwarizmi Engineering Journal مجلة الخوارزمي الهندسية ISSN: 18181171 23120789 Year: 2018 Volume: 14 Issue: 1 Pages: 1-9
Publisher: Baghdad University جامعة بغداد

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Abstract

A new type of solar air heater was designed, fabricated, and tested in Baghdad, Iraq winter conditions. The heater consists of two main parts. The horizontal section was filled with the black colored iron chip while the vertical part has five pipes filled with Iraqi paraffin wax. A fan was fixed at the exit of the air. Two cases were studied: when the air moved by natural convection and when forced convection moved it. The studied air heater has proven its effectiveness as it heated the air passing through it to high temperatures. The results manifest that using little air movement makes the temperatures, stored energies, and efficiencies of the two studied cases converge. The suitable solar intensity of Baghdad city makes the use of solar air heater suitable to reduce the electricity and fossil fuels consumption.

تم تصميم وتصنيع وفحص عمل نوع جديد من مسخنات الهواء الشمسية في اجواء مدينة بغداد- العراق. يتكون مسخن الهواء من جزئين رئيسين. الجزء الافقي ملأ برايش الحديد سوداء اللون بينما ثبتت خمسة انابيب مملوءة بمادة الشمع البرافينيي متغيرة الطور في الجزء العمودي. ثبتت مروحة عند فتحة خروج الهواء. تمت دراسة حالتين: عندما يتحرك الهواء بفعل الحمل الطبيعي والحالة الثانية عندما يتحرك بفعل الحمل القسري.اثبت مسخن الهواء المدروس كفاءته اذ انه سخن الهواء المار خلاله الى درجات حرارة عالية. بينت النتائج ان تحريك الهواء بسرع منخفضة يجعل درجات الحرارة والطاقات المخزونة و الكفاءات للحالتين المدروستين تتقارب. ان شدة الاشعاع الشمسي لمدينة بغداد مناسبه جدا لاستخدام مسخنات الهواء الشمسية والتي من شأنها ان تقلل استهلاك الكهرباء والوقود الاحفوري.


Article
Numerical and Experimental Study of CPU Cooling with Finned Heat Sink and Different P.C. Air Passages Configurations
دراسة التجریبیة و العددیة لتبرید وحدة المعالجة المركزیة مع مشتت حراري ذو زعانف باستخدام اشكال مختلفھ لاماكن دخول الھواء للحاسوب المكتبي

Authors: Jalal M. Jalil جلال محمد جلیل --- Ekbal H. Ali اقبال حسین علي --- Hiba H. Kurdi ھبھ ھادي كردي
Journal: AL-NAHRAIN JOURNAL FOR ENGINEERING SCIENCES مجلة النهرين للعلوم الهندسية ISSN: 25219154 / eISSN 25219162 Year: 2018 Volume: 21 Issue: 1 Pages: 99-107
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

This study investigated numerically and experimentally fluid flow and heat transfer in the desktop PC. Three patterns of the positions of air inlet and outlet were tested to find the best one for cooling. The computer components in the present study are CPU, finned heat sink, power supply, motherboard, CD, HDD and fans. Three components which were generate heat are CPU, motherboard and power supply and there were two openings for air inlet and two for air outlet. The air inlet velocities were 1.2, 1.8, 2.4 m/s with constant CPU fan velocity. The studied parameters were the changed of inlet air velocity, powers of CPU, motherboard and PSU and the positions of inlet air. The numerical results obtained are found in a good agreement with the experimental results. The experimental results show that the maximum temperature was 81℃ at 16.5 W and 1.2 m/s. Numerical results showed that the CPU temperature reaches 89.6 ℃ at 18.5 W and 1.2 m/s. From the results, it was found that; the temperatures of the main components (PSU and motherboard) affected little by CPU power and vice versa, the finned heat sink has higher cooling efficiency and the pattern 1 was the best pattern for CPU cooling.


Article
Numerical and Experimental Study of Cooling in Desktop Computer with Block Heat Sink

Authors: Jalal M. Jalil --- Ekbal H. Ali --- Hiba H. Kurdi
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 4 Part (A) Engineering Pages: 430-438
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This paper investigates numerically and experimentally fluid flow and heat transfer inside the desktop P.C.. The study of cooling considers the components; CPU, heat sink, power supply, motherboard, CD, HDD and fans. Three components have heat source (CPU, motherboard and power supply unit). There were two openings for air inlet and two for air outlet. The tested values of air inlet velocities were 1.2, 1.8 and 2.4 m/s. The work investigates the effect of inlet air velocity and powers (PCPU = 8.5 W, PPSU = 24 W, PMO=12 W) of multi-components (CPU, motherboard and PSU). The numerical results obtained (by finite volume method CFD) are found in a good agreement with the experimental results. The results show that the highest temperature for CPU with block heat sink was 88.1℃ (PCPU = 8.5 W, PPSU = 24 W, PMO=12 W), the temperature of the heat generation components decreases linearly with increases of inlet air velocity. The CPU temperature increases with CPU power linearly. Motherboard temperature was the lowest one due to its position and area (52oC). Full details of flow field and temperature distribution are shown.

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