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Article
Performance of Solar Module withPresence of Two Types of Reflectors in Concentrator System

Authors: Fadhil Mahmood Oleiwi --- Ahmed F. Atwan --- Naseer K.Kasim
Journal: IRAQI JOURNAL OF COMPUTERS,COMMUNICATION AND CONTROL & SYSTEMS ENGINEERING المجلة العراقية لهندسة الحاسبات والاتصالات والسيطرة والنظم ISSN: 18119212 Year: 2019 Volume: 19 Issue: 2 Pages: 50-57
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Any work to improve the performance of the solar modules could add to theireconomic competitiveness against fossil fuels. In the present work the performance of PVsolar module was improved by using V-Trough concentrator system (CPV) which movedby two axis tracking system. The concentrator consists of two flat reflectors of area 2 m2for each one with geometric concentration ratio of 2X. To optimize the performance of theV-Trough CPV systems, two types of reflector material, Aluminum and mirror (glass coatedby silver nitrate) were used. The results indicated that the temperature of PV referencemodule was higher than the ambient temperature by 27oC but there is too small differencein temperature between the tracking PV module with the reference which ranged to 2oC,while the temperature of the CPV system was higher than reference by 37oC. Thetemperature of the PV module under mirror reflectors was lower than module combinedwith Aluminum reflectors by 3oC. As a result of arising of the temperature of CPV systemin compare with PV reference module, the open circuit voltage was droop by 0.7 V, 0.5 Vfor PV module under mirror and Aluminum reflectors respectively. The reflectorsincreased the short circuit current values by 2.1 A, 2.6 A for PV module combined withmirror and Aluminum reflectors respectively. Accordingly the performance (as an averagedaily gain of output power) of the PV solar module was improved by using V-Trough CPVsystem, 44%, 34% by using Aluminum and mirror reflectors respectively.


Article
Design and study of two axis tracking system
تصميم ودراسة منظومة تتبع شمسي بمحورين

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Abstract

In this paper we presents the design, construction and also investigates the experimental study of a two axis (azimuthally and Polar) automatic control solar tracking system to track solar dish according to the direction of beam propagation of solar radiation. The designed tracking system consists of sensor and controller with built operated control circuits to drive motor with control .The designed Sun tracker was operated in the control system, two steeper motors were used to the movement of the system, keeping the sun’s beam at the center of the sensor. To investigate the effect of using two-axis sun tracking systems.The measured variables were compared with the fixed axis, the results indicate that the energy surplus becomes about (20-30%) with atmospheric influences. In case of seasonal, The system is a flexible tracking system with low cost electromechanical set-up, low maintenance requirements and ease of installation and operation.

في هذا البحث تم تصميم وتركيب منظومة للتتبع الشمسي باتجاهين العمودي والأفقي ليستمر بتتبع الشمس تم استخدام ماطور خاص يستخدم في كاميرات المراقبة يتحرك باتجاهين عمودي وافقي وتم عمل دائرة الكترونية للسيطرة لهذا الغرض باستخدام كاشف بصري كادميوم سلفايد. ومن خلال المنظومة تم دراسة الاشعاع الشمسي لمدينة تكريت الساقط على المركز الشمس ولوحظ زيادة الكفاءة بحدود (30-20)% وكان النظام رخيص وكفوء في عملية التتبع .


Article
Design and Operation of Solar Parabolic Dish for Water Heating
تصميم وتشغيل الصحن الشمسي ذو القطع المكافئ لأغراض تسخين الماء

Authors: Yaseen. H. Mahmood --- Mohamad A. K. Ahmed
Journal: Journal of College of Education مجلة كلية التربية ISSN: 18120380 Year: 2015 Issue: 1 Pages: 253-268
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Design and operation of (2m) parabolic solar dish, water heater for hot water application was described. The heater was designed to provide hot water up to 100 oC using the clean solar energy. The system includes the design and construction of solar tracking unit in order to increase system performance. Experimental test results, which obtained from clear and sunny day refer to highly energy-conversion efficiency and promising a well performed water heating system.

في هذا البحث جرى تصميم وبناء وتشغيل الصحن الشمسي ذو القطع المكافئ بقطر) (2mلأغراض تسخين الماء. وقد تم تصميم الصحن لتجهيز ماء بدرجة حرارة تصل الى (100 C)باستخدام الطاقة الشمسية. وتتضمن المنظومة كذلك تصميم وبناء وتشغيل وحدة التتبع الشمسي لغرض زيادة كفاءة المنظومة. لقد اظهرت نتائج الفحوصات العملية والتي اجريت في الاجواء المشمسة والصحوة كفاءة عالية في تحويل الطاقة الشمسية الى طاقة حرارية ، مما يفسح المجال للحصول على منظومة تسخين الماء بكفاءة عالية.


Article
AN ASSESSMENT THE EFFICIENCY FOR A PARABOLIC TROUGH SOLAR COLLECTOR WITH DIFFERENT HORIZONTAL AXIS BY USING TRACKING SYSTEM
الكفائة لمجمع شمسي ذي قطع مكافئ باختلاف الاحداثي الأفقي وباستخدم معقب شمسي

Author: Ali A. F. Al- Hamadani
Journal: DIYALA JOURNAL OF ENGINEERING SCIENCES مجلة ديالى للعلوم الهندسية ISSN: 19998716/26166909 Year: 2017 Volume: 10 Issue: 1 Pages: 48-57
Publisher: Diyala University جامعة ديالى

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Abstract

The solar energy in Iraq is available, but till now a little application for using it. The parabolic trough solar collector (PTSC) technology, which considers being one of the low-cost and most operative technologies for solar power plant. The performance of a PTSC with solar tracking system has been experimentally investigated under Kut city, Iraqi climate conditions. The experimental work focused on changing the horizontal axis and mass flow rate of water. It has been started with 0o, 30o, 60o receptively. The zero angle represents an east direction, then rotate toward the south. The instantaneous efficiency was employed to evaluate the thermal performance of the PTSC. The equation had been solved using equation engineering solver (EES). The results showed that Kut city holds a good potential for such energy generation technology with an average efficiency of 38.8% and instantaneous efficiency that can reach as high as 70%. This study is highly encouraging the Iraq government to invest in the PTSC technology in Iraq to meet the increasing demand on electric power. The best efficiency is zero angle which represents the east direction. The efficiency, enhanced with the mass flow rate till certain value. The heat transfer coefficient for zero angle was significant compare with other angles. The result was validated with fixed parabolic trough and a good agreement. The performance improved with increase the mass flow rate till 30 kg/hr after that no any effect of it.

الطاقة الشمسية متوفرة في العراق لكن تطبيقاتهاقليلة. البحث يتناول دراسة عملية لمجمع شمسي ذي قطع مكفئ مع منظومة تعقب. البحث تم في الظروف الجوية لمدينة الكوت-العراق. الكفائة الحرارية والانية تم توضيفها لمعرفة الاداء الحراري لجهاز. الاحداثي الافقي تم تغييره للجهاز وللزوايا 0،30،60 حيث ان الزاوية ضفر تمثل الشرق ومن ثم التدوير باتجه الجنوب. النتائج بينت ان مدينة الكوت جيدة لتوليد الطاقة الكهربائية وان كفائة الجهاز 38.8% والكفائة الانية 70%. النتائج مشجعة للتطبيقات الشمسية في هذه المنطقة لسد النقص في الطلب على الطاقة. النتائج العملية وضحت ان افضل كفائة عند الزاوية هي الصفر. التغير في درجات الحرارة بين دخول الماء وخروجه اعلى عند الزاوية صفر. المجمع الشمسي تم مقارنته مع مجمع شمسي ثابت وكانت النتائج جيدة.

Keywords

The solar energy in Iraq is available --- but till now a little application for using it. The parabolic trough solar collector --- PTSC technology --- which considers being one of the low-cost and most operative technologies for solar power plant. The performance of a PTSC with solar tracking system has been experimentally investigated under Kut city --- Iraqi climate conditions. The experimental work focused on changing the horizontal axis and mass flow rate of water. It has been started with 0o --- 30o --- 60o receptively. The zero angle represents an east direction --- then rotate toward the south. The instantaneous efficiency was employed to evaluate the thermal performance of the PTSC. The equation had been solved using equation engineering solver --- EES. The results showed that Kut city holds a good potential for such energy generation technology with an average efficiency of 38.8% and instantaneous efficiency that can reach as high as 70%. This study is highly encouraging the Iraq government to invest in the PTSC technology in Iraq to meet the increasing demand on electric power. The best efficiency is zero angle which represents the east direction. The efficiency --- enhanced with the mass flow rate till certain value. The heat transfer coefficient for zero angle was significant compare with other angles. The result was validated with fixed parabolic trough and a good agreement. The performance improved with increase the mass flow rate till 30 kg/hr after that no any effect of it. --- الشمسي،المجمع الشمسي،المعادلات الهندسية، المعقب الشمسي

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