Khadija Omer Mohiuddin

Year: 2023

Academic Degree: Master

Supervisor Type: Co-supervisor

Supervisor State: Graduated

Water is very important for eat availability, manufactural productivity, environmental sustainability , and socioeconomic advancement in a country. Worldwide, water shortages and climate change have risen in latest years because of the growing number of people, fast industrialization and urbanization, and inadequate administration of available water resources. The aim of the current study is to investigate the performance of the pyramid solar system, specifically the influence of the pyramid shape with multi-bed on the amount of water collected from ambient air. In this study, a solar collector was designed and built in the form of a prismatic pyramid with four sides of the glass panel. The height of the collector is (140 cm ). The thickness of the insulation layer for the base of the pyramid is (15 cm ) and the dimensions of the base of the pyramid are (100 cm × 100 cm). The sides of the two pyramids are covered with thick glass (5 mm). There are four shelves inside the pyramid. The vertical distance between each shelf is approximately (30 cm ) . The thickness of the beds in each pyramid unit is (10 cm). The collector works using calcium chloride (CaCl2) as a moisture absorbent, and uses saw wood and cloth as a host. During the night, moisture is absorbed from the air. During the day, the absorbed water is evaporated by solar energy, and the evaporated water is condensed on the sides of the solar collector. The practical results showed the possibility of obtaining a total water productivity of up to 2 liters per day per square meter of surface area. The results also showed that the efficiency of the system is (20%) for cloth and (14%) for saw wood.

B.Sc. of Refrigeration and Air-Conditioning Engineering

Sep 1, 2001 - Sep 1, 2005

M.Sc. of Mechanical Engineering

Oct 1, 2009 - Aug 7, 2012

Ph.D of Mechanical Engineering

Oct 1, 2015 - Dec 25, 2019

Mechanical Power Techniques Engineering [• Department rapporteur of Mechanical Power Techniques Engineering, Engineering Technical College / Kirkuk, Northern Technical University]

Jul 2, 2019 - Jul 8, 2025

Mechanical Power Techniques Engineering [Head of Department]

Jul 8, 2025 - Present

Mechanical Power Techniques Engineering [• Lecturer of Mechanical Power Techniques Engineering, Engineering Technical College / Kirkuk, Northern Technical University, Iraq]

Jan 30, 2013 - Present

Mechanical Power Techniques Engineering [• Technical trainer of Refrigeration and Air Conditioning Techniques Engineering, Engineering Technical College / Kirkuk, Northern Technical University, Iraq]

Nov 16, 2005 - Dec 30, 2012

Numerical study on entropy minimization in pipes with helical airfoil and CuO nanoparticle integration

Apr 6, 2024

Journal Open Engineering

publisher Open Engineering

DOI https://www.degruyterbrill.com/document/doi/10.1515/eng-2022-0594/html

Issue 1

Volume 14

In this study, minimizing entropy generation in a horizontal pipe is numerically investigated through two passive techniques: in the first mode, the helical wire inserts in the pipe were placed at three various ratios of pitch ratio. The second mode is adding cupric oxide nanoparticles at various volume concentrations. Experiments were conducted for Reynolds numbers ranging from 4,000 to 14,000 under a uniform heat flux scenario of 25,000 W/m2. The study utilized the ANSYS 14.5 software, employing the K-omega standard model, which involves three primary governing equations: continuity, momentum, and energy. According to the data, it was determined that the helical wire placed inside the pipe with a small pitch ratio decreased the entropy generation number. Cupric oxide nanoparticles also have a substantial impact on the entropy generation number. The higher volume concentration models had lower entropy generation numbers and Bejan numbers than the other models. Comparative analyses further emphasize the substantial advantages of using cupric oxide nanofluids and helical-wire inserts, with efficiency gains ranging from 5.08 to 11.7%. Keywords: entropy generation; numerical investigation; nano‎fluids; helical airfoil; Bejan numbers

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Enhancing heat exchanger performance with the use of nano fluids, twisted tubes, and tape

Nov 11, 2023 - Jan 11, 2024

Publisher AIP Publishing

DOI https://doi.org/10.1063/5.0216170

Country Iraq

Location Kirkuk

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