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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
Combined Solar Chimney Power Plant and Solar Still

Author: Salman H. Hammadi سلمان هادي حمادي
Journal: Basrah Journal for Engineering Science مجلة البصرة للعلوم الهندسية ISSN: Print: 18146120; Online: 23118385 Year: 2016 Volume: 16 Issue: 2 Pages: 100-107
Publisher: Basrah University جامعة البصرة

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Abstract

This study presents solar chimney power plantintegrated with seawater desalination system. A simplemathematical model is based on the conservation of massand energy. The results show that the integrated system ofsolar chimney power plant and solar still can achievesimultaneously. The analysis is performed for bothsummer and winter at latitude 30oN. It’s noted that thewater layer thickness is of a significant effect on the freshwater productivity while the dimensions of solar chimneyand the solar collector are of a minor effect. Theproductivity of fresh water and output power for summerare the highest. The present work is compared withexperimental data of the other work and showed a goodagreement.


Article
SIMULATION SOLAR ELECTRICAL GENERATION POWER PLANT BY USING PARABOLIC TROUGH IN BASRA CITY
محاكاةُ محطة توليد الطاقة الكهربائية باستخدام المجمعات الشمسية ذات القطع المكافئ الوعائي في مدينةِ البصرة

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Abstract

ABSTRACT A simulation for a solar thermal electric generating system with parabolic trough collectors in Basra city is presented. This system consists of three parts: solar collector fields to heating the working fluid, a storage system to store the thermal energy, and power conversion system to convert the thermal energy to electrical. The simulation is presented for all parts. The energy conversion of solar radiation into thermal power along the absorber tube of the parabolic collector is studied. The coupling between the collector and the thermodynamic cycle is made up by heat exchangers, yielding the characteristic temperatures of the cycle. The conventional Rankine cycle is used as the thermodynamic cycle, whereby the electric power is calculated. All calculations are performed according to Basra climate’s conditions for 21st of each month in 2007.Engineering Equation solver (EES) software is used in this simulation. Good agreements are obtained when comparing the results of the collector outlet temperatures and gross power of the current model with experimental data belonging to the Solar Electric Generating Systems (SEGS) installed in the Mojave Desert in southern California, whose solar field is composed by parabolic trough collectors. The analytical model developed combines precision and flexibility, making it an attractive tool for simulation and design of solar power stations in Basra city.

الخلاصةيقدّمُ هذا البحث محاكاة لمنظومة توليد طاقة كهربائيةِ حراريِة شمسيِة تستخدم المجمعات الشمسية ذات القطعّ المكافئ الوعائي (parabolic trough) في مدينةِ البصرة. تَشْملُ هذه المنظومةِ ثلاثة أجزاءِ: المجمعِ الشمسي المستخدم لتَسْخين المائع الناقل للحرارةَ و منظومة لخزنِ الطاقةَ الحراريةَ ومنظومة تحويل الطاقة الحرارية إلى طاقة كهربائيةِ، تم عَمل المحاكاة لهذه الأجزاء الثلاثة. وقد تمت دراسة تحويلَ طاقةَ الإشعاعِ الشمسيِ إلى الطاقة الحراريةِ على طول الأنبوب الماصَ للمجمعِ الشمسي ذي القطع المكافئ الوعائي. إنّ الربط بين المجمعِ الشمسي والدورة الثرموديناميكية للمحطة (thermodynamic cycle) تم بواسطة المبادّلات الحراريةِ، للحصول على درجاتَ الحرارة المناسبة لعمل الدورةِ. وقد فَرض أن منظومة تحويل الطاقة مكونة من محطة بخارية كهربائية تعمل بدورة رانكن التقليدية (conventional Rankine cycle)، حيث تم حساب الطاقة الكهربائية لهذه المحطة. لعمل المحاكاة لهذه المحطة أُختيرَ يوم (21) من كل شهر لعام 2007 وافترض انه يوم صحو وخالي من الغيوم. كما تم تصميم وتحليل هذه المحطة وفقا لظروف مناخ مدينة البصرة. لعمل المحاكاة استعملت برمجيات Engineering Equation Solver (EES) . أوضحت المقارنة بين نَتائِجَ النموذجِ الحالي مع النَتائِجَ التجريبيةِ التي تَعُودُ إلى أنظمةِ توليد الطاقة الكهربائيةِ الشمسيةِ الموجودة في صحراءِ موييف في جنوب كاليفورنيا، التي يتكون حقلها الشمسي مِن مجمعات شمسية ذات القطعّ المكافىءِ الوعائي، توافقا كبيرا. أن الدقّةِ والمرونةِ للنتائج ِ التحليليةِ النموذجيةِ المتطورةِ التي تم الحصول عليها، تجعلها أداة جذّابة للمحاكاةِ وتشجع على تصميمِ محطاتِ الطاقة الكهربائية الشمسيةِ في مدينةِ البصرة.

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