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Article
Enhancement the Performance of PV Panel by Using Fins as Heat Sink

Author: Ibtisam A. Hasan
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 7 Part (A) Engineering Pages: 798-805
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In this paper, theoretical and experimental study of the performance enhancement of PV panels has been presented by utilizing fins for cooling module’s temperature at climate conditions operation. To satisfactory cool off for the solar panel as a passive technique, heat sink which has a rectangular variable cross section fins (ribs) attached on the back side of the panel. Analytical thermal model is formulated for heat dissipation from heat sink in order to predict PV panel temperature. A comparison between experimental and theoretical results was carried out for solar panels without and with fins, in order to investigate the proposed thermal model and study the effect of operating temperature on the power output from the panel. The results shows that using fin cooling technique causes a significant dropped in average solar panel temperature about 5.7°C and an enhancement in the average of module output power about 15.3%.


Article
Application of Earth Tube Heat Exchanger and Solar Chimney for Natural Cooling System in Basrah City

Authors: Salman H. Hammadi --- Alaa Hlaichi Mohammed
Journal: Basrah Journal for Engineering Science مجلة البصرة للعلوم الهندسية ISSN: Print: 18146120; Online: 23118385 Year: 2014 Volume: 14 Issue: 2 Pages: 23-32
Publisher: Basrah University جامعة البصرة

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Abstract

Solar chimney (SC) together with earth to air heat exchanger (EAHE) is being employed as a low-energy consuming technique to remove undesirable interior heat from a building in the hot seasons. A numerical program "FLUENT 6.3 code" of an earth to air heat exchanger (EAHE) is studied for predicting the outlet air temperature and cooling potential of these devices in Basrah climate. Theoretical analyses have been conducted in order to investigate the ventilation in a solar chimney. The investigation into the viability of Low Energy Earth Pipe Cooling Technology in providing thermal comfort in Basrah. The demand for air-conditioning in buildings in Basrah affects the country escalating energy consumption. Therefore, this investigation was intended to seek for an alternative passive cooling to air-conditioning. The passive technology, where the ground was used as a heat sink to produce cooler air, has not been investigated systematically in hot and humid countries. A sub-soil temperature model adapted for the specific conditions in Basrah is presented and its output compared with CFD modeling. The results have shown that the potential of Earth Pipe is providing lower output temperature of air inlet to the room. We found that the resulting temperature at the buried pipe outlet decreases with increasing pipe length, decreasing pipe diameter, decreasing mass flow rate of flowing air in the pipe and increasing depths up to 4m.


Article
PASSIVE COOLING BY UTILIZING THECOMBINED PCM / ALUMINUM FOAM MATRIX TO IMPROVE SOLAR PANELS PERFORMANCE: INDOOR INVESTIGATION
التبريد السلبي من خلال الاستفادة من مدمج PCM / مصفوفة الالمنيوم الرغوي لتحسين اداء الالواح الشمسية : تحقيق مختبري

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Abstract

In this study, utilizing the PCM latent heat of fusion to absorbing the heat energy from photovoltaic panels was done. This method works as a passive cooling to regulate the PV panel’s temperature in hot climate regions. To enhance the important effective physical properties such as thermal conductivities (keff) for this material, aluminum foam matrix was used with paraffin wax. This led to good temperature distribution inside PCM and more heat absorption from PV panel. The experimental results indicated that the PV panel temperature drooped from (61.39 oC) to (46.2 oC) by using PCM only, and to (39.58oC) by using PCM/Aluminum foam matrix at the test end, (i.e. the percentage drooping of PV panel temperature was (25.03%) by using PCM only, and it was (35.51%) by using PCM/Aluminum foam matrix). This droop in temperature enhances the electrical performance of PV panel such as maximum power generated, fill factor (FF), etc. The improving in electrical efficiency of PV panel at the test end was from (10.19%) to (12.37%) with using PCM only, and to about (13%) with using PCM/Aluminum foam matrix.

في هذه الدراسة, تم استثمار الحرارة الكامنة للانصهار للمواد المتغيرة الطور PCM لامتصاص الطاقة الحرارية من الالواح الكهروضوئية , هذه الطريقة تعمل كطريقة تبريد سلبي لتنظيم درجة حرارة الالواح الكهروضوئية في المناطق ذات المناخ الحار. لتحسين الخصائص الفيزيائية الفعالة المهمة كالموصلية الحرارية (keff) لهذه المادة, تم استخدام مصفوفة الالمنيوم الرغوي مع شمع البارافين, ادى هذا الى توزيع درجات حرارة جيد داخل المادة المتفيرة الطور PCM والى زيادة في امتصاص الحرارة من اللوح الكهروضوئي. بينت النتائج العملية ان درجة حرارة اللوح الكهروضوئي انخفضت من(61.39 oC) الى (46.2 oC) باستخدام المادة المتغيرة الطور PCM فقط, وانها انخفضت الى (39.58oC) باستخدام المادة المتغيرة الطور مع مصفوفة الالمنيوم الرغوي في نهاية الفحص,(بمعنى اخر, النسبة المئوية لانخفاض درجة حرارة اللوح الكهروضوئي كانت (25.03%) باستخدام ال PCM فقط, وكانت (35.51%) باستخدام المادة المتغيرة الطور مع مصفوفة الالمنيوم الرغوي). هذا الانخفاض بدرجات الحرارة ادى الى تحسين بالاداء الكهربائي للوح الكهروضوئي كاعلى قدرة كهربائية متولدة, عامل الاملاء(FF) , الخ. التحسين بالكفائة الكهربائية في نهاية الفحص كانت من (10.19%) الى (12.37%) باستخدام ال PCM فقط, والى حوالى (13%) باستخدام المادة المتغيرة الطور مع مصفوفة الالمنيوم الرغوي.

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