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Article
EXPERIMENTAL STUDY THE EFFECT OF ABSORBING TUBE DIAMETER ON THE PERFORMANCE OF COMPOUND PARABOLIC CONCENTRATOR SOLAR COLLECTOR

Authors: Talib Zghayer Farge --- Abdul Aziz Ali --- Hiba Ali Hussein
Journal: Journal of Engineering and Sustainable Development مجلة الهندسة والتنمية المستدامة ISSN: 25200917 Year: 2018 Volume: 22 Issue: 4 Pages: 247-255
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

A system of test rigs of solar collectors with the compound parabolic concentrator (CPC) have designed to study the performance namely (heat flux and efficiency) for all the solar collectors. The acceptance angle of the CPC taken at 45⁰ for all the solar collectors. The system used to study the effect of absorbing tube diameter on the solar collector performance. A halogen light used as energy source with different absorber tube diameters (0.75, 1, and 1.5) inch used. It has observed that the relationship between the time with the readings of water temperature inside the absorber tube and the performance results show that there are three regions for variation for all collectors. The variation for the water temperature, heat flux and efficiency in the first region varied sharply, in the second region varied gradually and in the third region remained constant. The compering performance results between the different solar collectors with different absorber tube diameters show that the collector with 1.5-inch absorber tube diameter gives the best performance than the others. Where the percentage increase in the temperature for the collector with absorber tube diameter of 1.5 inch compering with the other diameters ( 0.75 , 1 ) inch are (28.3 and 20.7) respectively While in case of heat flux are (69.8 and 53.4) and for the efficiency are (68.8 and 28).


Article
DESIGN, CONSTRUCTION, AND TESTING OF A PARABOLIC TROUGH SOLAR CONCENTRATOR SYSTEM FOR HOT WATER AND MODERATE TEMPERATURE STEAM GENERATION
تصميم، بناء واختبار منظومة مركزات شمسية ذات القطع المكافئ لإنتاج المياه الساخنة والبخار عند درجة حرارة متوسطة

Authors: Ahmed A. Shaheed احمد عبد الرزاق شهيد --- Raoof M. Radhi رؤوف محمد راضي --- Mohammed H. Abbood محمد حسن عبود
Journal: KUFA JOURNAL OF ENGINEERING مجلة الكوفة الهندسية ISSN: 25230018 Year: 2018 Volume: 9 Issue: 1 Pages: 42-59
Publisher: University of Kufa جامعة الكوفة

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Abstract

Three parabolic trough collectors, with its two axes sun manual tracking system were designed, constructed, and operated in order to generate hot water and moderate temperature steam. An experimental investigation for testing the performance of a PTC is presented. The tests have been carried out in NAJAF climatic conditions (32.02º N, 44.33º E) during selective days of August. The thermal performance of PTC evaluated according to the Standard ASHRAE 93- 1986 (RA 91) and the efficiency curve for the PTC was estimated. In the performance analysis of the PTC array, the effects of collector inlet temperature, ambient conditions, two cases for glass receiver and the variation in mass flow rate of the working fluid were investigated. The tests were performed by collecting the data from the outdoor measurements to evaluate the instantaneous thermal efficiency for PTC. A peak efficiencies close to (50%, 18.8%) were obtained for solar collectors with evacuated and non-evacuated glass receiver respectively at higher flow rate. The collector efficiency equation that is obtained in the present work agrees with other researches.

تم تصميم وبناء واختبار ثلاثة مجمعات حوضية ذات القطع المكافئ )) مع نظام يدوي بمحورين للتتبع الشمس، لغرض PTC توليد الماء الساخن والبخار عند درجة حرارة متوسطة. تم تقديم بحث عملي لاختبار أداء أل )). الاختبارات العملية نفذت تحت الظروف المناخية لمحافظة النجف الأشرف ( خلال أيام مختارة من شهر أغسطس. تم 32.02º N, 44.33º E) PTC حساب الأداء الحراري لل STANDARD ASHRAE 93 ( )) طبقا ل ( -) وتم إيجاد منحني الكفاء لل 1986 PTC) . PTC في تحليل أداء أل )) تم بحث تأثير درجة حرارة الدخول، الظروف المحيطة، حالتين للمستلم الزجاجي والتغير في معدل جريان مائع التشغيل. الاختبارات نفذت بواسطة جمع البيانات من القياسات الخارجية لحساب الكفاءة الحرارية اللحظية PTC لل 50 )). ذروة الكفاءات المستحصلة كانت ( % ،18.8 %) للمجمعات الشمسية مع المستلم المفرغ وغير المفرغ على التوالي عند معدل الجريان الأعلى. معادلة كفاءة المجمع المستحصلة في العمل الحالي تمت مقارنتها مع بحوث أخرى.

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