research centers


Search results: Found 2

Listing 1 - 2 of 2
Sort by

Article
PERFORMANCE ANALYSIS OF A COMPACT SOLAR WATER HEATER WITH PARAFFIN WAX STORAGE UNIT

Authors: Raid Salman Fahad --- Amir Fadhil Noori --- Aouf Abdulrahman Al-Tabbakh
Journal: Journal of Engineering and Sustainable Development مجلة الهندسة والتنمية المستدامة ISSN: 25200917 Year: 2019 Volume: 23 Issue: 1 Pages: 135-144
Publisher: Al-Mustansyriah University الجامعة المستنصرية

Loading...
Loading...
Abstract

The present work experimentally studies the thermal performance of a solar collector integrated with a thermal storage unit to form a compact solar water heater. The storage capacity is further enhanced by attaching a phase-change storage unit containing phase change material (PCM) which is paraffin wax. The two units (tanks) take the form of two shallow rectangular boxes (compartments) tilted at 45o to the horizon and are firmly attached to ensure complete mutual heat transfer between them. Water and PCM fill the top and bottom tanks respectively. Measurements were carried out from 8 a.m. to 4 p.m. where the temperatures at various locations in the system were measured along with ambient temperature and solar radiation intensity. Results show that the temperature of both compartments increases continuously during the simulated period with the upper tank having the higher temperatures. The PCM average temperature did not reach melting range (55oC – 60oC) which requires either decreasing the amount of PCM or using a PCM with a lower melting point. The maximum temperatures reached are 82oC for water and 47oC for PCM which are measured at 4 p.m. and the maximum overall system efficiency of the system was 74% at 11:30 a.m.


Article
Thermal Performance of Plastic Receiver in Solar Collector
الاداء الحراري لمستقبل بلاستيكي في مجمع شمسي

Author: Kadhim Fadhil Nasir كاظم فاضل ناصر
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2019 Volume: 25 Issue: 7 Pages: 37-60
Publisher: Baghdad University جامعة بغداد

Loading...
Loading...
Abstract

A plastic tubes used as absorber of active flat plate solar collector (FPSC) for heating water were studied numerically and experimentally. The set-up is located in Babylon (republic of Iraq) 43.80 East longitude and 32.30 North latitude with titled of 450 toward the south direction. The study involved three dimensions mathematical model for flat coil plastic absorber which solved by FLUENT-ANSYS-R.18 program. Experiments were conducted at outdoor conditions for clear days on January and February 2018 with various water volume flow rates namely (500, 750, 1000, 1250, and 1500 Liter per hour LPH) on each month for Reynolds number range of (1 x 104 to 5 x 104) through the receiver. The experimental results showed improvement in absorber input - output temperature difference, collector efficiency, and water storage temperature; the maximum input - output temperature difference is 3.1 °C, the maximum collector efficiency is 79%, and the maximum water storage temperature is 67 °C. The comparison validates a good agreement between the numerical and experimental results at variable operation conditions with maximum deviation of 4.2%. Also the experimental results were compared with previous study for similar condition and gave a good improvement.

تم اجراء دراسة عددية وعملية على مجمع شمسي من نوع الصفيحة المستوية الفعال باستخدام انابيب بلاستيكية كمستقبل شمسي. اجريت الدراسة العملية في محافظة بابل (العراق) عند خط طول 43.8 درجة شرقا و خط عرض 32.3 درجة شمالا مع زاوية ميلان 45 درجة مع الافق باتجاه الجنوب. تضمنت الدراسة بناء نموذج رياضي ثلاثي الابعاد للمستقبل البلاستيكي وتم حله بواسطة برنامج الانسز فلونت 18 . تم اجراء التجارب العملية في الاجواء الخارجية خلال شهري كانون الثاني وشباط 2018 لمعدلات جريان مختلفة للماء المار داخل المستقبل وهي (500, 750, 1000, 1250,و 1500) لتر بالساعه خلال كل شهر ولمدى رقم رينولد من 1*104 الى 5*104. اثبتت النتائج العملية فاعلية في فرق درجات الحرارة للماء مابين الدخول والخروج للمستقبل وفاعلية في كفاءة المجمع الشمسي ودرجات حرارة الماء المخزون حيث كان اكبر فرق بدرجات الحرارة هو 3,1 درجة مئوية و اكبر كفاءة للمجمع الشمسي هي 79% واعلى درجة حرارة للماء المخزون هي 67 درجة مئوية. تم اجراء مقارنه مابين النتائج العددية والعملية لهذا البحث وكان التطابق جيدا مع وجود فرق مقداره 4,2% كما تم اجراء مقارنه ما بين النتائج العملية لهذه الدراسة ونتائج الدراسات السابقة عند ظروف تشغيل متشابهة واعطت المقارنة افضلية جيده للدراسة الحالية.

Listing 1 - 2 of 2
Sort by
Narrow your search

Resource type

article (2)


Language

English (2)


Year
From To Submit

2019 (2)