Abdel Rahman Elbakheit | King Saud University (original) (raw)

Papers by Abdel Rahman Elbakheit

Scientific reports, Feb 24, 2024

BENTHAM SCIENCE PUBLISHERS eBooks, Jun 23, 2021

Vide Leaf, Hyderabad eBooks, 2021

A ducted photovoltaic façade (DPV) unit was studied using experimental prototype and simulated in... more A ducted photovoltaic façade (DPV) unit was studied using experimental prototype and simulated in a full scale computational fluid dynamics (CFD) model. The study comes in two parts; this is Part I, as detailed in the title above, and Part II is titled "A Ducted Photovoltaic Façade Unit with Buoyancy Cooling: Part II CFD Simulation". The process adopted in the experimental study is replicated in the simulation part. The aim was to optimize the duct width behind the solar cells to allow for a maximum buoyancy-driven cooling for the cells during operation. Duct widths from 5 to 50 cm were tested in a prototype. A duct width of 45 cm had the maximum calculated heat removed from the duct; however, the lowest cell-operating temperature was reported for duct width of 50 cm. It was found that ∆T between ducts' inlets and outlets range from 5.47 • C to 12.32 • C for duct widths of 5-50 cm, respectively. The ducted system enhanced module efficiency by 12.69% by reducing photovoltaic (PV) temperature by 27 • C from 100 • C to 73 • C. The maximum measured heat recovered from the ducted PV system was 422 W. This is 48.98% from the incident radiation in the test. The total sum of heat recovered and power enhanced by the ducted system was 61.67%.

Sustainability

This paper explores the potential of forced convection cooling in a ducted photovoltaic façade un... more This paper explores the potential of forced convection cooling in a ducted photovoltaic façade unit. Where a photovoltaic panel is backed by a 5 cm thick insulated duct at a depth of 50 cm. The potential of heat removal from the photovoltaic unit due to forced convection is investigated with a range of fan speeds from 1 m/s to 6 m/s. It is found that the ΔT between the inlet and outlet of the duct ranged from 2.6–24.6 °C. A fan speed of 4 m/s yielded the highest cooling potential by removing 550 W with a cooling efficiency of 51%. Whereas a fan speed of 6 m/s yielded the lowest mean PV cell temperature of 62.7 °C. This would improve the cell’s efficiency by 17.53%. This very experimental setup has been tested previously with natural convection cooling, which removed 529 W with a maximum efficiency of 48.98% This improves PV panel efficiency by 12.69%. The addition of heat removed and power recovered by the ducted system was 68.53% of the former (i.e., forced convection), while it wa...

International Journal of High-Rise Buildings, 2012

This paper discusses major strengths of tall buildings that distinguish them as sustainable solut... more This paper discusses major strengths of tall buildings that distinguish them as sustainable solutions for the built environment. It sheds light on some of the key attributes of tall buildings as well as materials and technologies that could boost their performance environmentally, economically and technically as well as the natural habitats containing them. Tall buildings are portrait as major successful options for accommodating the ever increasing urban world population, with little negative impact on ecologies and environmental habitats worldwide. The role of tall buildings as 'vertical garden sub-cities' mitigating modern city problems of 'urban heat islands' and sprawling cities is explored. A few building examples as well as city developments are presented which represent the new generation of sustainable tall buildings that are setting trends for future projects incorporating innovations in materials and building systems and designs.

Frontiers in Civil Engineering, 2021

Frontiers in Civil Engineering: Volume 5, 2021

Journal of Islamic and Human Advanced Research, 2013

Nowadays Tall buildings are being portrayed as saviours of the world's cities problems of roc... more Nowadays Tall buildings are being portrayed as saviours of the world's cities problems of rocketing population densities, need for rapid expansions, scarcity of land for development, sprawling growth, heat island phenomena etc., Whereas the presence of Tall buildings in Historical or antiquity context is subjected to more scrutiny than in any other prevailing context in cities around the world. The good news is that the ingenuity of architects in striking the balance between the need to cope with current pressing issues (i.e., normally requiring advanced modern technology) without losing the spirit or essence of a particular historical context. That is normally achieved with conceiving cultural Iconography out of Tall buildings by employing symbols or elements from very intrinsic and/or indicative cultural dispositions within a given context and reproducing it through, form, texture, light, art, material, etc. producing an elegantly proportionate master piece of tall buildings t...

Journal of Lesbian Studies, 2020

Abstract We analyze the intersection of femme, aging, and later-in-life disability by using the p... more Abstract We analyze the intersection of femme, aging, and later-in-life disability by using the popular, contemporary slogan “femme ain’t frail” to explore who is erased, excluded, and overlooked when fem(me)ininity is conceptualized as strong, fierce, and chosen. Building from Lisa Walker’s position that dominant femme discourse marginalizes the experiences of aging femmes, we analyze the narratives of Amber Hollibaugh, Joan Nestle, Mary Frances Platt and Sharon Wachsler to explore femme experiences of later-in-life disability and aging, and to further trouble existing, popular constructions of femme identity that are predicated upon youth and able-bodiedness. We elaborate on discourses of femme and frailty, bringing them together to explore the ways femme is or, can be, frail. Insofar as femme is located in vulnerability, and vulnerability is associated with frailty, we see how femme might, indeed, be frail, and why this relationship is important to explore, not disavow. We contend that considerations of the frailty of fem(me)ininity can challenge the ageist and ableist orientation of contemporary femme politics and the broader cultural devaluation of fem(me)ininity.

This paper represents some work aimed at providing a systematic approach in building design towar... more This paper represents some work aimed at providing a systematic approach in building design towards a successful integration of wind harnessing renewable energy technologies. The approach adopts the use of building forms and profiles to assist local wind patterns of the site in question to trigger a continuous stream of air that can be used to power a turbine of a suitable shape and size. In this sense it takes into consideration the use of building masses and adjacencies to create such flows، as well as the general outline of the urban settings. This enables the Architectural design process of form finding and justification in terms of functionality and economic suitability a further step to achieve sustainability. In this process computational fluid dynamics CFD provides the corner stone in evaluating، testing and optimising an envisaged design solution. The capability of the CFD code to predict the patterns of air movements with magnitude and direction with potential pressures on...

This paper built enviro technologie natural hab the ever in habitats wo 'urban heat are prese... more This paper built enviro technologie natural hab the ever in habitats wo 'urban heat are present future proje

This paper explores the potential of building integrated photovoltaic in Riyadh city. It quantifi... more This paper explores the potential of building integrated photovoltaic in Riyadh city. It quantifies the available solar power through a comparison of two sources of solar energy measurements. Best integration strategies are discussed as well as an optimization to the tilt angle of the solar panel in Riyadh is investigated. An appraisal of the current advancement in PV technologies is carried out, with special reference to their suitability for integration within the environmental setting of the city. Manual seasonal adjustment of tilt angles of the photovoltaic panels is calculates through simple equations that can be handy for designers where access for more sophisticated tools is limited. Optimum tilt angles would be due South at 48.1 degrees from horizontal level in the winter solstice, while it should be 1.1 degrees from the horizontal level in the summer Solstice. In both equinoxes the tilt angle should be 24.6 degrees from the horizontal level. Results are compared with availa...

This paper presents the results from a simulation of the buoyancy effect occurring behind photovo... more This paper presents the results from a simulation of the buoyancy effect occurring behind photovoltaic modules. Computational fluid dynamics (CFD) has been applied as a tool to predict airflow and temperatures in a cavity behind a heated panel. The results have been compared with experimental results published in the literature. Further discussion of using CFD in evaluating the performance of passive design of building envelopes integrated with PV is made. A number of design options were generated and evaluated.

While wind generated noise maybe limited in magnitude and effect, wind-induced structures’ vibrat... more While wind generated noise maybe limited in magnitude and effect, wind-induced structures’ vibrations could be a devastation (i.e., Tacoma Bridge Collapse 1940). This occurs with just above moderate wind speed increase, if it can excite a structure with its natural frequencies. When this occur, structures enter a phase of oscillations until collapse. However, with proper understanding of vibrations in structures these vibrations can be eliminated. Studying vibrations can be experimental through wind-tunnel and or by simulations. Wind in buildings can induce two types of motions: static or sustained; as building drift and oscillatory or resonant vibration. Motion is composed of three contributions: sway in two horizontal or perpendicular directions and torsion. This vibration would considerably affect the habitability and stability of building spaces gauged through a life cycle assessment study, habitability perception and determination or acceleration measurements and estimation. Th...

International Journal of Architectural Research: ArchNet-IJAR

Sustainable tall buildings are increasingly under rapid development and scrutiny worldwide. This ... more Sustainable tall buildings are increasingly under rapid development and scrutiny worldwide. This will pave the way to a new generation of buildings designed in a unique form of Architectural systems integration. That is to say, finding new ways to integrate the systems, finding new common grounds and perhaps more comprehensive optimizations. The significance of integrating sustainable systems within tall buildings is the corner stone in delivering sustainable tall buildings globally. The paper looks into ways and means to better integrate passive and active renewable energy technologies and systems, green and sustainability measures into tall building’s design. Other issues such as architectural Iconography, and heritage and cultural influences on tall building’s design are also mentioned. The objective is to develop a framework for sustainable systems integration in buildings, proposing areas of further integrations customizable to any particular site context. The focus is on key ...