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Numerical Simulation of The Influence of Geometric Parameter on The Flow Behavior in a Solar Chimney Power Plant system
نمذجة رقمية لتاثير المعاملات الهندسية على سلوك الجريان في منظومة مدخنة شمسية لتوليد القدرة

Authors: Arkan khilkhal Husain اركان خلخال حسين --- Waheeds Shate Mohammad وحيد شاتي محمد --- Abbas JassimJubear عباس جاسم جبير
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2014 Volume: 20 Issue: 8 Pages: 88-108
Publisher: Baghdad University جامعة بغداد

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Abstract

Numerical simulations have been carried out on the solar chimney power plant systems. This paper gives the flow field analysis for a solar chimney power generation project located in Baghdad. The continuity, Naver-stockes, energy and radiation transfer equations have been solved and carried out by Fluent software. The governing equations are solved for incompressible, 3-D, steady state, turbulent is approximated by a standard model with Boussiuesq approximation to study and evaluate the performance of solar chimney power plant in Baghdad city of Iraq. The different geometric parameters of project are assumed such as collector diameter and chimney height at different working conditions of solar radiation intensity (300,450,600,750 and 900 W/m2) to gain the optimal designed structure. The results show that the change of collector diameter and chimney height has considerable effects on the performance of the system. The velocity increase when the collector diameter and chimney height increase and reach to the maximize value at H=D 12 m and when solar intensity (900 W/m2). The study shows that Iraqi weather are suitable for this system.

تم اجراء محاكات عددية على نظام محطة المدخنة الشمسية للطاقة.تبين هذه الدراسة تحليل لحقل الجريان لمشروع محطة المدخنة الشمسية للطاقة في بغداد. تم حل معادلات الاستمرارية,Naveries-Stokes ,الطاقة والاشعاع الشمسي باستخدام برنامج Fluent(14).في هذه الدراسة تم حساب اداء المدخنة الشمسية من خلال حل المعادلات الحاكمة خلال جريان لاانظغاطي ,ثلاثي الابعاد,مستقر واضطرابي حيث تم الاستعانة بالموديل الاضطرابي (k-ԑ) في اجواء بغداد- العراق.خلال هذه الدراسة تم فرض عدد من المتغيرات الهندسية المختلفة مثل قطر المجمع الشمسي و ارتفاع المدخنة الشمسية وذلك عند ضروف اختبار مختلفة من شدة الاشعاع الشمسي (300,450,600,750,900) واط/م2 وذلك لغرض التوصل الى افضل تصميم. من ابرز النتائج التي تم التوصل اليها , ان قطر المجمع وارتفاع المدخنة له تاثير كبير على متغيرات اداء النظام. تزداد السرعة داخل المدخنة الشمسية بزيادة قطر المجمع وارتفاع المدخنة وتصل الى اقصى قيمه لها عندما كان قطر المجمع وارتفع المدخنة ( 12 م ) وعند شدة اشعاع شمسي (900 واط/م2 ). ان اجواء العراق تعتبر ملائمة لهذا النوع من الانظمة.


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.

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