Mohamed S. Yousef

University Carlos III de Madrid | UC3M · Department of Thermal and Fluids Engineering

This study proposes a cost-effective multigeneration system that integrates a supercritical carbon dioxide (sCO2) power cycle with a liquefied natural gas (LNG) regasification process. The system aims to deliver electricity, cooling, heating, and hydrogen simultaneously. Utilizing the temperature difference between the sCO2 cycle and the LNG therma...

The present study introduces a novel tri-generation system that is highly efficient and cost-effective, employing a supercritical CO2 (sCO2) Brayton cycle as the primary mover and harnessing the cooling potential from liquefied natural gas (LNG) as a heat sink. This innovative system simultaneously provides electricity, cooling, and hydrogen. By ca...

This paper presents an innovative trigeneration system designed for efficient power, cooling, and hydrogen production. It combines a supercritical carbon dioxide (sCO2) power cycle with a Kalina cycle (KC) and an ammonia-water-based absorption refrigeration cycle (ARC), all integrated with a PEM electrolyzer (PEME) unit. The system optimally utiliz...

In this study, a new cogeneration system is presented that can make optimal use of the waste heat from the sCO 2 power cycle using a double-effect parallel absorption refrigeration cycle (DEARC), generating electricity and refrigeration simultaneously. A comparative study between the proposed (sCO 2 /DEARC) system and the stand-alone sCO 2 power sy...

Combined cooling and power (CCP) systems have received global attention for their fuel-saving benefits, energy efficiency, and energy generation capabilities. Our research introduces a new and unique CCP system, which utilizes nuclear power. This is achieved through integrating a supercritical carbon dioxide recompression Brayton cycle (SCRBC) with...

Solar desalination is becoming the most prevalent method for addressing water constraint in every aspect of sustainable development. Much research has been done in the past that has demonstrated the sun desalination method's constant improvement in distilled water output. Solar desalination technologies, on the other hand, have undergone a number o...

Conventional desalination processes, powered by fossil energy sources, are featured by high energy consumption, high operating costs, emission of greenhouse gases, and high brine disposal, which all adversely affect the environment. Solar desalination is emerging as a sustainable solution for many water-stressed regions worldwide. However, solar de...

Flat heat pipe (HP)-phase change material (PCM) hybrid system used for thermal regulation of simulated PV is investigated experimentally. Three PCMs; Rubitherm RT-25 H (RT25), Rubitherm RT-35 H (RT35), and Rubitherm RT-44 H (RT44) coupled with the HP are tested for best cooling system. Impact of using one or two heat sinks compared with PCM only i...

Photovoltaic (PV) panels are one of the most important solar energy sources used to convert the sun’s radiation falling on them into electrical power directly. Many factors affect the functioning of photovoltaic panels, including external factors and internal factors. External factors such as wind speed, incident radiation rate, ambient temperature...

In this study, the year-round performance of a photovoltaic (PV) system coupled with phase change material/aluminum metal foam (PCM/AMF) composite as a passive cooling technique is performed based on on-site measured data. Experiments are conducted in different months of the year to compare the performance of the proposed PV-PCM/AMF system against...

A study is presented on the enhancement of solar still (SS) performance by using chimney exhaust gases (EGs) passing through chimney channels under the still basin. The impact of the exhaust gas temperature on the SS temperature, productivity, efficiency, and freshwater yield cost is considered. The SS performance with the chimney is compared with...

In the present work, a passive cooling strategy combining an aluminium foam matrix (AFM) with PCM was employed to regulate the temperature of a photovoltaic (PV) system The comparison between three PV modules was established ,the first one was conventional without any changes ,the second one was PV combined with PCM (PV-PCM) and the last one was PV...

The performance of photovoltaic (PV) modules worsens due to increasing their operating temperature. In the current study, a passive cooling technique comprising an aluminum metal foam (AMF) with PCM for thermal regulation of a PV system is performed. Outdoors experiments are conducted comprising two modules: PV without any modifications and PV with...

In this study, a paraffin/aluminum foam (AF) composite for thermal regulation of a photovoltaic (PV) system was performed. A comparative performance evaluation of three PV systems, i.e., PV without any modifications, PV incorporated with paraffin wax as phase change material PCM (PV-PCM), and PV incorporated with enhanced PCM comprising AF embedded...

The performance of solar air heater of having a new design tubular absorber of adjacent parallel tubes called tubular is investigated experimentally via energy, exergy, energy payback time, exergoeconomic, and enviroeconomic approaches. Moreover, the impact of utilizing porous material on the tubular heat performance is analyzed and compared to fla...

In this study, an assessment based on energy, exergy, economic, and environmental approaches on a double-pass (DP) solar air heater (SAH) having pin finned absorber at different air mass ratios up and down the absorber is investigated experimentally. Four air mass ratios are considered: (i) all the air mass flow passes up the absorber and returns t...

In this work, experimental work is presented on the performance of a hybrid solar distiller comprising solar still (SS) combined with parabolic trough solar collector (PTSC) using direct heating of salty water by the collector. In this technique, the salty water supplied to the SS is heated by passing it directly through the parabolic receiver with...

This work proposes an innovative statistical model by utilizing the response surface methodology (RSM) method to analyze a batch solar behaviour still. This investigation's main goal is to study the impact of the input factors (solar radiation, ambient temperature, water depth, and thickness of insulation) most influencing water productivity. The p...

An assessment of a flat plate double pass (DP) solar air heater (SAH) having V-corrugated absorber (C_SAH) and corrugated-perforated absorber (CP_SAH) via energy, exergy, economic and environmental approaches (4E) is presented experimentally. The study is performed at four different levels of air mass flow ratios inside the flat plate solar air hea...

This paper experimentally examines the performance of solar air heater (SAH) having a newly designed tubular absorber comprising adjacent parallel tubes called tubular SAH (T_SAH) via energy, exergy, and enviroeconomic standpoints. A comparative performance assessment between T_SAH and flat plate solar air heater (F_SAH) at diverse air mass flow ra...

An assessment of using different passive condenser designs of the solar distiller based on productivity, exergy, energy, exergoeconomic, enviroeconomic is investigated experimentally. Five different condenser designs are considered; (i) glass plate condenser, GC (CSS), (ii) corrugated aluminum sheet heat sink condenser, CHS, (iii) aluminum heat sin...

The performance of single slope solar still with an enhanced condenser at different saline water mediums in the basin is studied and assessed based on productivity, energy, exergy, economic, and enviroeconomic methodologies. Six solar still configurations are considered: conventional solar still (CSS); modified solar still (MSS) which is a still wi...

In this study, the performance of single slope solar still combined with enhanced condenser and integrated with parabolic trough solar collector (PTC), is assessed based on productivity, energy, exergy, exergoeconomic, and enviroeconomic methodologies. Experiments are conducted using various saline water media inside a basin exposed to the hot weat...

In this study, the performance of solar still incorporated with thermal energy storage (TES) unit of phase change material (PCM) is evaluated based on energy and exergy methodologies. Energy payback time for solar still with and without PCM is quantified and compared. Furthermore, the performance of both configurations is also evaluated from exergo...

The performance of parabolic trough solar collector (PTC) coupled with single slope solar still at various water mediums is assessed based on productivity, energy, exergy, exergoeconomic, and enviroeconomic methodologies and also Energy payback time. Six solar still systems are considered; conventional solar still (CSS), CSS coupled with PTC (CSS +...

The impact of salty water medium and condenser type on the performance of single slope solar still is experimentally performed. Two solar still types are examined; conventional solar still with glass condenser (CSS) and solar still with plated finned heat sink condenser (MSS). The study is investigated for three saline water mediums in the still ba...

In this study, energy, exergy, exergoeconomic and exergoenvironmental (4E) assessment of new integration of solar still with photovoltaic module (PV) is performed. This new integration is based on installing the PV module over the back side of the solar still while its output electrical power is converted directly to thermal heat to heat the saline...

In this study, comparative performance assessment of different passive solar stills systems based on energy matrices, exergy, economic, exergoeconomic, environmental, exergoenvironmental, enviroeconomic, and ex-ergoenviroeconomic viewpoints is performed. Six systems of passive solar stills are considered namely, traditional solar still (TRD still),...

In this study, the energetic, exergetic, economic and enviroeconomic (4E) analyses of single slope solar still using steel mesh fibers (a new porous medium) and hollow cylindrical pin fins as absorbing materials are investigated. Three cases are considered, case 1: traditional solar still, case 2: with hollow cylindrical pin fins, case 3: with stee...

The objective of this study is to improve the heat transfer characteristics of PCM storage unit, applicable to solar still system, using hollow cylindrical pin fins embedded in PCM. Hollow cylindrical pin fins act as thermal conductivity enhancer (TCE). In view of this, three cases are considered namely, Case 1: without PCM (conventional solar stil...

In this study, a comprehensive exergetic performance investigation of a single slope a passive solar still system is theoretically presented. Energy and exergy methodologies have been applied for all components of the solar still comprising glass cover, brackish water, and basin-liner. Also, exergy irreversibility analysis was conducted to identify...

In this study, a comparative performance analysis was performed between a conventional photovoltaic system and a low-concentration photovoltaic system. Two typical photovoltaic modules and two compound parabolic concentrating photovoltaic systems were examined. A Cooling system was employed to lower the temperature of the solar cells in each of the...

Egypt is facing energy crisis despite of the development in every consumption sector. Hence, a search for the efficient utilization of renewable energy, specially the solar energy is a must. The aim of the present work is experimentally and numerically investigating the performance of the photovoltaic (PV) panel integrated with truncated symmetric...