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Article
the Life Cycle Assessments of Gas Turbine using Inlet Air Cooling System
تحسين أداء ودورة حياة التربينات الغازية باستخدام منظومة تبريد الهواء الداخل

Author: Thamir K. Ibrahim
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2015 Volume: 22 Issue: 1 Pages: 69-75
Publisher: Tikrit University جامعة تكريت

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Abstract

The achievement of life cycle assessments of energy systems with both maximum power output and economical profits is considered as the main objective of operations management. This paper aimed to evaluate both of the performance of a gas turbine using an inlet air cooling system as well as its life cycle cost. Accordingly, a thermodynamic model and an economic model are developed respectively to derive an analytical formula for calculating the cooling loads and life cycle cost. The major results show that, the output power of gas turbines power plant with a cooling system is (120MWh) which is higher than that of gas turbines power plant without the cooling system (96.6 MWh) at peak condition; while the life cycle cost is lower in the case of gas turbines power plant with cooling system. Thus, the proposed methods show a potential cost reduction and achievable through changing the structure of the system.


Article
Design of ZnO Nanowire Laser Single Mode and Study Its Properties

Authors: Ahmed A. Ahmed --- Rafid A. Abdulla
Journal: JOURNAL OF EDUCATION AND SCIENCE مجلة التربية والعلم ISSN: 1812125X Year: 2019 Volume: 28 Issue: 2 Pages: 133-149
Publisher: Mosul University جامعة الموصل

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Abstract

Designing of single-mode ZnO nanowire laser has been achieved. Studying its properties has also been considered. Analysis of single-mode rate equations indicates that the laser has threshold current of 53 mA, the output power of 30 mW at bias current of 70 mA and the slope efficiency around 1.77 mW/mA for the output power from both mirrors. The critical diameter for nanowire has been calculated and it is found to be 128 nm. The number of nanowire rods through designed area of dimensions (21µm×21µm) has also been calculated. The cavity of nanowire laser is (F-P). The results are compared with some experimental work of ZnO nanowire lasers and good agreement is found.


Article
Design and Performance Investigation of a Hydraulic MiniTurbine Based on Renewable Energy Production System

Author: Layth H. Jawad
Journal: Journal of University of Babylon مجلة جامعة بابل ISSN: 19920652 23128135 Year: 2019 Volume: 27 Issue: 3 Pages: 1-12
Publisher: Babylon University جامعة بابل

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Abstract

Nowadays great interest of renewable energy production systems since last few years. The renewable energy sources such as a hydro, solar and wind have been rapidly growing,especially the hydropower energy due to the increasing of predicted scarcity of fossil fuels and the environmental issues. Kaplan turbine is a reaction type of hydropower which is one of the primary sources of renewable energy. In this study, the aimof this work is to design and performance investigationof a Kaplan turbine runner for determining the power output and efficiency based on different configurations of turbine wheel. The main characteristics of a micro Kaplan turbine primary proposed design configurations was performed to increase the use of renewable power in rural areas and reduce the dependence on fossil fuels. The computational fluids dynamics (CFD) was used to simulate the proposed design for further analysed and improve both the power output and efficiency using ANSYS CFX17.1.The performance of a micro Kaplan turbine has been predicted such as power output and efficiency.Furthermore, the effect of blades number showed a significant influence on the turbine’s power output and efficiency. Generally, improvement of proposed design configurations are presented for understanding the flow field in a Kaplan turbine runner.

فيالوقتالحاضراهتمامكبيرةلانظمةإنتاجالطاقةالمتجددةمنذالسنواتالقليلةالماضية. شهدتمصادرالطاقةالمتجددةمثلالطاقةالمائيةوالطاقةالشمسيةوطاقةالرياحنمواًسريعاً،لاسيماالطاقةالكهرومائيةبسببتزايدندرةالوقودالأحفوريوالقضاياالبيئية. توربينكابلانهو أحد انواعانتاجالطاقةالكهرومائيةومنالمصادرالرئيسيةللطاقةالمتجددة. فيهذهالدراسة،يهدفهذاالعملإلىتصميموفحصأداءعجلةتوربين كابلان لتحديدناتجالطاقةوكفاءتهااستنادًاإلىالانواعالمختلفةلعجلةالتوربينات. الخصائصالرئيسية الأساسية للتصاميمالمقترحةلتوربينكابلانالصغير اجريت وذلكلزيادةاستخدامالطاقةالمتجددةفيالمناطقالريفيةوتقليلالاعتمادعلىالوقودالأحفوري. تماستخدامديناميك الموائعالحسابية (CFD) لمحاكاةالتصاميمالمقترحةللتعرف على مزيدمنالتحليلوتحسينكلاًمنالقدرة الخارجة والكفاءةباستخدام ANSYS CFX17.1. وقدتمالتنبؤبأداءتوربينكابلانالصغيرمثل القدرة الخارجة والكفاءة. علاوةعلىذلك،أظهرت النتائجانعددالريش يؤثر بشكل كبيرعلىاداءالتوربيناتوكفاءتها. بشكلعام قدمت تحسينات للتصاميم المقترحة وذلك لفهم مجال الجريان داخل عجلة توربين كابلان.

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