تحديد الكفاءة الحرارية الأمثل لنموذج مركز شمسي خطي قطعي

Authors

  • عيسى مراد
  • براءه حمادي

Abstract

إنَّ ازدياد الطلب على الطاقة والمشاكل الناجمة عن تلوث البيئة أدى إلى التوجه لرفع كفاءة استخدام الطاقة من خلال الأبحاث العلمية المرتبطة بالطاقات المتجددة. خاصة أنَّ سورية تتمتع بإشعاع شمسي عالي وزمن سطوع شمسي طويل. يتركز البحث حول تحديد الكفاءة الحرارية لنموذج مركز شمسي خطي قطعي (PTC) بهدف الحصول على النموذج الأمثل حرارياً واقتصادياً وفق الشروط المناخية لمدينة دمشق. تم وضع نموذج رياضي للمركز المدروس وفق الأبعاد التصميمية المحسوبة من خلال حل معادلات الزوايا الشمسية والإشعاع الشمسي المباشر على مدار السنة. وقد تم حل هذا النموذج باستخدام عدة برامج حاسوبية (Excel, EES). بينت النتائج أنَّ زيادة زاوية الحافة تؤدي إلى زيادة كفاءة المركز, وإنَّ أفضل كفاءة للمركز حرارياً واقتصادياً بلغت ( ) عند زاوية حافة ( ). وتكون الأبعاد التصميمية لنموذج المركز هي: (S= 3.66 [m], Wa= 3.56, , rr= 2.15 [m]) لأجل تدفق 0.61 [kg/s] ودرجة حرارة تصميمية 85 [ͦ C] لمائع نقل الحرارة )الماء( عند قطر خارجي للمستقبل . The drastically increase in energy demand and the problems resulted from environmental pollution have led to a serious trend towards energy utilization efficiency improvement through scientific researches related to renewable energies, particularity that Syria has a high solar irradiance and prolonged sunshine hours. This research focuses on determining the thermal efficiency for a prototype of a parabolic trough solar concentrator (PTC) to obtain the optimal prototype thermally and economically according to climatic conditions in Damascus. It has been deposited the mathematical model of the studied concentrator depending on the calculated design parameters through calculating the solar angles equations and direct solar irradiance throughout the year. And it has been solved this model by using numerous computer programs (Excel, EES). The results showed that the increasing of rim angle lead to increasing the thermal efficiency of the concentrator and the preferable efficiency of the concentrator thermally and economically reached ( ) at rim angle ( ). And the design parameters of the concentrator prototype are (S= 3.66 [m], Wa= 3.56, , rr= 2.15 [m]) for mass flow rate 0.61 [kg/s] and design temperature 85 [ºC] of heat transfer fluid (water) at the outer diameter of the receiver .

Downloads

Published

2017-10-29

How to Cite

1.
مراد ع, حمادي ب. تحديد الكفاءة الحرارية الأمثل لنموذج مركز شمسي خطي قطعي. Tuj-eng [Internet]. 2017Oct.29 [cited 2024Dec.23];38(6). Available from: https://journal.tishreen.edu.sy/index.php/engscnc/article/view/3287

Issue

Vol. 38 No. 6 (2016): العلوم الهندسية

Section

Articles

License

Copyright (c) 2017 ttps://creativecommons.org/licenses/by-nc-sa/4.0/

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

The authors retain the copyright and grant the right to publish in the magazine for the first time with the transfer of the commercial right to Tishreen University Journal for Research and Scientific Studies - Engineering Sciences Series

 Under a CC BY- NC-SA 04 license that allows others to share the work with of the work's authorship and initial publication in this journal. Authors can use a copy of their articles in their scientific activity, and on their scientific websites, provided that the place of publication is indicted in  Tishreen University Journal for Research and Scientific Studies - Engineering Sciences Series   .  The Readers have the right to send, print and subscribe to the initial version of the article, and the title of  Tishreen University Journal for Research and Scientific Studies - Engineering Sciences Series     Publisher

journal uses a CC BY-NC-SA license which mean

You are free to:

  • Adapt — remix, transform, and build upon the material
  •  
  • The licensor cannot revoke these freedoms as long as you follow the license terms.

 

  • Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • NonCommercial — You may not use the material for commercial purposes.
  • ShareAlike — If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.
  • No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.