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Article
Energy Saving in Power Consumption by Using Double Glazing Windows in Iraq

Authors: Walaa M. Hashim --- Hisham A. Hoshi
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 9 Part (A) Engineering Pages: 1002-1007
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

It is generally accepted that the summer in Iraq is relatively hot season, where the temperature sometimes reaches 60 Cº. Accordingly, most of the Iraqi houses are characterized as having a large area of windows with a single glass, which could be resulted in a significant loss in cooling energy. Hence, the present research concern is to examine the effect of using double glass windows (as an alternative to single glass) on the saving in which energy normally used in houses and buildings at July and August for different hours 3, 6, 9, 12, 15, 18, 21 and 24 P.m. A practical and realistic study was conducted. Three values of aspect ratio are used 30, 15 and 10 for the presence of air between the panels and in the presence of the argon gas for aspect ratio, 10 were practically investigated. The experimental results confirmed that using of the double glass with the presence of air as a medium for heat transfer between the two panels could be reduced the amount of heat transferred compared to that of single glass between (45-78), (54-85)and(58-88)%, while for argon it was (60-91)%.


Article
Investigation Vibration Damping in the Hydraulic Systems by Using an Accumulator

Authors: Huda.A.Al-Sali --- Walaa.M. Hashim --- Hisham. A. Hoshi
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 12 Part (A) Engineering Pages: 1276-1282
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

It is generally accepted that the vibration of fluid power systemsconsidered to be one of the major problems that is normally occurred in thehydraulic system, which causes a noise and short life of its components.Accordingly, it should be reduced the efficiency as well as an increase leakagesystem. Hence, present study pays more attention to investigate a bladder anaccumulator which was successfully added to the hydraulic system in order toreduce the vibrations that might be generated by the system and decelerate theactuator at the end stroke. Which variables are measured before relief anddirectional valve and at the linear cylinder body. It was found that the maximumpercentage damping in vibration velocity at a position before relief anddirectional control valve and at cylinder body was 20%, 20.8% and 55% at 20and 15 bar pressure supply respectively. Whereas, it was observed theacceleration was 11.3%, 12.5% and 50% at 40 bar pressure supply. Also, it wasfound that the piston begins decelerate gradually from distance 25cm in whichequal to 1/6 of total stroke length with a period of time 5 seconds.


Article
Effect of Colored Filters on PV Panels Temperature and Performance under Baghdad Meteorological Condition
تأثير الفلاتر الملونة على حرارة واداء االلواح الكهروضوئية تحت الظروف الجوية لمدينة بغداد

Authors: Abdulmunem R. Abdulmunem --- Abdullateef A. Jadallah --- Hisham A. Hoshi --- Mohammed H. Jabal
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2018 Volume: 25 Issue: 4 Pages: 46-50
Publisher: Tikrit University جامعة تكريت

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Abstract

In this work, the influence of colors of filters upon the photovoltaic panels rising temperature and electrical performance was studied under Baghdad Meteorological Condition. Basing on the energy analysis of a photovoltaic solar system and by using the photonic theory, the available energy on the PV plane system has been evaluated. Seven colored filters each with (85W) PV modules were used in this case study, to reveal the impact of colored filters upon the electrical productivity of PV panel with the variation in the temperature caused by these filters. There is themain issue of this work is to show how the performance of PV module by imposing colored filter and hence how and to how much improve it by reducing the cell temperature in hot climate. Outcomes showed that the PV technology is affected by the color filters. In other words, red filter gives light have least photons energy, and violet filter gives light have the most photons energy and green is between the two. So, red colors filter gives highest PV panel temperature comparative with others filters, while violet color filter was the lowest. PV module with the lowest temperature colored filter gives the best electrical performance than others.

في هذا العمل، تمت دراسة تأثير ألوان الفالتر على ارتفاع درجة حرارة واألداء الكهربائي لأللواح الكهروضوئية تحت الظروف الجوية لمدينة بغداد . على أساس تحليل الطاقة لنظام الطاقة الشمسية الضوئية وباستخدام النظرية الفوتونية، تم تقييم الطاقة المتاحة على نظام اللوح الكهروضوئي .تم استخدام سبعة فالتر ملونة مع كل نموذج كهروضوئي )85 واط( في هذه الحالة الدراسية، للكشف عن تأثير الفالتر الملونة على إنتاجية األلواح الكهروضوئية الكهربائية مع التغير في درجة الحرارة التي تسببها هذه الفالتر. القضية الرئيسية لهذا العمل هو إظهار كيفية أداء النموذج الكهروضوئي عن طريق فرض الفلترة الملونة وبالتالي كيف وإلى اي مدى يتم التحسين عن طريق خفض درجة حرارة الخلية في المناخ الحار .أظهرت النتائج أن التكنولوجيا الكهروضوئية تتأثر بالفالتر الملونة . وبعبارة أخرى، الفلتر األحمر يعطي ضوء له أقل طاقة فوتونية، ويمنح الفلتر البنفسجي ضوء له اعلى طاقة فوتونية واالخضر بين االثنين. لذا ، الفلتر األحمر اللون يعطي أعلى درجة حرارة للوح الكهروضوئي مقارنة مع بقية الفالتر ، بينما كان الفلتر البنفسجي اللون هو األقل. النموذج الكهروضوئي مع الفلتر الملون االقل درجة حرارة يعطي أفضل أداء كهربائي من البقية.

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