research centers


Search results: Found 3

Listing 1 - 3 of 3
Sort by

Article
Enhancement the Performance of PV Panel by Using Fins as Heat Sink

Author: Ibtisam A. Hasan
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 7 Part (A) Engineering Pages: 798-805
Publisher: University of Technology الجامعة التكنولوجية

Loading...
Loading...
Abstract

In this paper, theoretical and experimental study of the performance enhancement of PV panels has been presented by utilizing fins for cooling module’s temperature at climate conditions operation. To satisfactory cool off for the solar panel as a passive technique, heat sink which has a rectangular variable cross section fins (ribs) attached on the back side of the panel. Analytical thermal model is formulated for heat dissipation from heat sink in order to predict PV panel temperature. A comparison between experimental and theoretical results was carried out for solar panels without and with fins, in order to investigate the proposed thermal model and study the effect of operating temperature on the power output from the panel. The results shows that using fin cooling technique causes a significant dropped in average solar panel temperature about 5.7°C and an enhancement in the average of module output power about 15.3%.


Article
Performance Evaluation of the V–basin Tube Solar Collector by Using .Different Nanoparticles and Base Fluids

Authors: Ibtisam A. Hasan --- Khaliid F. Sultan
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 4 Part (A) Engineering Pages: 461-470
Publisher: University of Technology الجامعة التكنولوجية

Loading...
Loading...
Abstract

This research discuss the performance and evaluation of V –basin collector in heating systems of solar with different nanofluids and base fluids, where metal nanofluids [Ag (20nm) + DW + EG], and metal oxide nanofluid [TiO2 (40nm) + DW + EG]are the used operating fluids with flow rate of 25 lit/hr, 50 lit/hr and ratios of concentration (i.e. 1, 2, 3 and 5 % vol). The base fluids employed in these experiment is distilled water and ethylene glycol. The metal and oxide metal nanofluids are shown a significant improvement in the performance of V –basin tube solar collector with higher thermal conductivity as well as heat transfer comparing to the base fluid (distilled water and ethylene glycol). The metal nanofluids [Ag (20nm) + DW + EG]at 5 % vol and flow rate of 25, and 50 lit/hr showed an important impact in characteristics values of thermal solar for fR(τα),–fRULwere.–6.317 W/m2. 0K, 0.522 and.–6.524 W/m20K, .0.542, whereas for the oxide nanofluid (TiO2 (40nm) + DW+EG) were –5.523 W/m20K, 0.473 and –5.1731 W/m2. 0K, 0.502 severally. The characteristics values of thermal solar to Dw and EG for flow rate of 25 lit/hr and 50 lit/hr were – 4.033 W/m2.0K, 0.382, –4.065 W/ m2.0K, and 0.421 severally. The size and type of nanofluid are necessary to enhancement heat transfer process, and improve performance of solar collector of V-basin type. The metal and oxide nanofluids used as a working fluid may improve the thermal performance of tube solar collector of V – basin because of small nanoparticles for metal, oxide metal and high thermal conductivity of silver. The metal and oxide nanofluids achieved an improvement when it was compared to DW and EGmostly at a high. Inlet temperature. The impacts of metal .nanofluid and oxide metal nanofuids are taken into regard on solar nanofluids system of heating as well as different base fluids.


Article
MODELING AND MODIFICATION FOR DISTRIBUTION TRANSFORMER (250 KVA, 11/0.416 KV) TO REDUCE THE TOTAL LOSSES
نمذجة وتطوير محولة توزيع (250 KVA, 11/0.416KV)

Authors: Assist. Prof. Ibtisam A. Hasan --- Dr. Sahar R. Fafraj --- Eng. Azhar K. Azeez
Journal: Al-Qadisiyah Journal for Engineering Sciences مجلة القادسية للعلوم الهندسية ISSN: 19984456 Year: 2016 Volume: 9 Issue: 4 Pages: 479-491
Publisher: Al-Qadisiyah University جامعة القادسية

Loading...
Loading...
Abstract

This paper presents the electromagnetic model for the 3- phase distribution transformer 250 KVA 11/.416KV core type. This model based upon using "ANSYS PROGRAM" to obtain the flux density distribution and losses, in this work, it has been change core material from silicon steel (Si.St.) to amorphous steel (Am. St.). Where, the iron losses reduction with 90%. The result for computer program are compared with practical measurements.

عرض البحث الحالي نمذجه كهرومغناطيسية لمحولة توزيع ثلاثية الأطوارKVA250 , 11/.416 فولت,50هيرتز مغطسة بالزيت من نوع اللب. نفذ الموديل المقترح بمساعدة التسهيلات التي يوفرها برنامج "ANSYS " للحصول على توزيع كثافة الفيض المغناطيسي وإيجاد الخسائر للمحولة. وقد تم تغيير مادة قلب المحولة من سيلكون ستيل إلى مادة الاستيل العشوائية حيث قلت الخسائر الحديديه بنسبة 90%.النتائج التي تم الحصول عليها من البرنامج قورنت مع النتائج العمليه المقاسه.

Listing 1 - 3 of 3
Sort by
Narrow your search

Resource type

article (3)


Language

English (3)


Year
From To Submit

2018 (2)

2016 (1)