New theoretical approach of flat plate solar collector considering the glass cover as participating media subjected to solar and thermal radiations
Other Title(s)
دراسة جديدة للاقط مائي باعتبار الغطاء الزجاجي كوسط غير رمادي معرض للطاقة الشمسية و الحرارية
Parallel Title
دراسة جديدة للاقط مائي باعتبار الغطاء الزجاجي كوسط غير رمادي معرض للطاقة الشمسية و الحرارية
Author
Source
Arab Journal of Basic and Applied Sciences
Issue
Vol. 2, Issue 0 (30 Jun. 2006), pp.33-42, 10 p.
Publisher
University of Bahrain College of Science
Publication Date
2006-06-30
Country of Publication
Bahrain
No. of Pages
10
Main Subjects
Engineering & Technology Sciences (Multidisciplinary)
Topics
Abstract AR
يتناول هذا البحث دراسة جديدة للاقط مائي شمسي آخذا بعين الاعتبار الامتصاص و الإشعاع داخل الغطاء الزجاجي.
تمت المحاكاة للاقط الشمسي باستخدام نوعين من الزجاج، شفاف عادي و شفاف ذي نسبة منخفضة من الحديد.
تم استعمال الثوابت البصرية (n) و (k) لمعامل الانكسار للنوعين.
الوقت المستهلك لمحاكاة الجهاز كان طويلا جدا.
لذا تم إنشاء نماذج نصف رمادية لتسريع الحسابات.
تم إثبات أن المردودية اللحظية للجهاز، إذا استخدمنا الزجاج ذا النسبة المنخفضة من الحديد، تكون أعلى مقارنة بالزجاج العادي.
Abstract EN
A new theoretical approach of black flat-plate solar collector considering the glass cover as a participating media and taking into account the absorption and emission within a glass cover is presented.
Two kinds of glasses commonly used as cover for such system, clear and low iron, have been studied.
The glass materia! is analyzed as a non-gray plane parallel medium subjected to solar and thermal irradiations in one-dimensional case using the Radiation Element Method represented by Ray Emission Model The optical constants of the complex refractive index, considering 160 values the pair of real part (n) and imaginary part (k), of a clear and low iron glasses reported by Rubin covering the range of interest for solar and thermal calculation have been used.
The CPU times for predicting the thermal behavior of a solar collector using non-gray models were found to be prohibitively long.
Therefore, suitable semi-gray (SG) models have been proposed for rapid calculation.
We should mention that the results presented here are related to the low-iron glass.
However, the instantaneous efficiency of the solar collector with low iron glass cover was compared with that obtained with clear one using SG models.
It has been shown that the effect of the non-linearity of the radiative heat exchange, between the black plate absorber and the surroundings on the shape of the instantaneous efficiency curve is important.
Indeed, the thermal loss coefficient is not constant but is function of temperature; due primarily to the radiative transfer effect.
Therefore, when the heat exchange by radiation is dominant compared with the convective mode, the profile of the efficiency curve is not linear.
It has been also shown that the instantaneous efficiency of the solar collector with a low iron glass cover is higher than the efficiency of the system with clear glass cover.
It increases by approximately 8%.
American Psychological Association (APA)
Matuq, Khoukhi. 2006. New theoretical approach of flat plate solar collector considering the glass cover as participating media subjected to solar and thermal radiations. Arab Journal of Basic and Applied Sciences،Vol. 2, no. 0, pp.33-42.
https://search.emarefa.net/detail/BIM-64263
Modern Language Association (MLA)
Matuq, Khoukhi. New theoretical approach of flat plate solar collector considering the glass cover as participating media subjected to solar and thermal radiations. Arab Journal of Basic and Applied Sciences Vol. 2 (Jun. 2006), pp.33-42.
https://search.emarefa.net/detail/BIM-64263
American Medical Association (AMA)
Matuq, Khoukhi. New theoretical approach of flat plate solar collector considering the glass cover as participating media subjected to solar and thermal radiations. Arab Journal of Basic and Applied Sciences. 2006. Vol. 2, no. 0, pp.33-42.
https://search.emarefa.net/detail/BIM-64263
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 41
Record ID
BIM-64263