Syed Mohammad Said

Syed Mohammad Said
King Fahd University of Petroleum and Minerals | KFUPM · Department of Mechanical Engineering

Ph.D.

About

141
Publications
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3,954
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Publications

Publications (141)
Article
The previously published studies based on the performance prediction of solar-powered adsorption chillers generally incorporate fixed heat/mass recovery (HR/MR) cycle times which remain unchanged during the entire course of operation of the adsorption chiller. In reality, the dynamics of the HR/MR processes are continuously subject to change due to...
Article
The published literature on natural circulation in package boilers lacks a model that performs calculations for each circuit and determines circulation parameters for all circuits. This study presents a developed computational procedure capable of sizing and analyzing the performance of natural circulation package boilers to meet a specific load. A...
Article
The previously published studies based on the performance prediction of solar-powered adsorption chillers incorporate a fixed cycle time which is either prespecified, or determined as a result of a numerical optimization procedure. However, the cycle time of a solar-powered commercial adsorption chiller cannot be expected to remain constant with th...
Article
Diesel-powered pumps are widely employed in farming and grassland irrigation. However, there can be problems of reliability and availability where fuel supply is erratic and expensive, high maintenance cost, and short life expectancy. These and recent concerns for the environment associated with the diesel engines call for a viable alternative sour...
Article
The stability of a turbulent diffusion flame temperature in an atmospheric gas-turbine combustor is investigated experimentally over a range of operating conditions to study the combined effect of hydrogen-enriched- methane (as fuel) and oxygen with carbon dioxide (oxy-fuel, as the oxidizer) on the combustion flame stability. These conditions inclu...
Article
The mitigation of environmental effects on clean-energy technology is an area of increasing interest. Photovoltaic (PV) modules have been widely used in small and large-scale applications for many years. However, they are not yet competitive with other electrical energy-generation technologies, especially in environments that suffer from dust, airb...
Article
Carbon dioxide is quantitatively the most significant component which facilitates in the global warming, it is utmost necessary to suppress the rapid increase of CO2 concentration in the atmosphere by means of Carbon Capture and Storage (CCS). Metal-organic framework (MOF) has recently been developed with the primary objective of CO2 capture from f...
Article
The simulation studies of conventional small-scale adsorption chillers reported so far in literature incorporate a pre-determined user-defined cycle time which remains constant with the increasing number of cycles. This study presents the first attempt of the numerical simulation of a two-bed solar adsorption chiller with "adaptive" cycle time base...
Article
Adsorption-based cooling systems are becoming increasingly popular due to a continuous rise in the worldwide demand for refrigeration and air-conditioning. This study aims to enhance the cooling performance of a solar-powered adsorption chiller using a novel multi-walled carbon nanotube (MWCNT)/MIL-100(Fe) composite adsorbent. A numerically validat...
Conference Paper
Full-text available
This paper investigated experimentally the oxy-combustion characteristics of hydrogen-enriched methane diffusion flames in a gas turbine model combustor under atmospheric conditions. Two sets of experiments were conducted considering two swirlers with swirl vane angles of 30 o and 55 o corresponding to swirl numbers of 0.44 and 1.10, respectively....
Article
Full-text available
A novel composite composed of exfoliated graphene nanoplatelets (Ex-GNPs) incorporated in a MIL-100(Fe) framework has been synthesized using an in situ molecular-level interaction approach. The resulting Ex-GNP/MIL-100(Fe) composite, with varying Ex-GNP contents, has been characterized for microstructure, degree of crystallinity, thermal stability,...
Article
The increased level of emissions of carbon dioxide into the atmosphere due to burning of fossil fuels represents one of the main barriers toward the reduction of greenhouse gases and the control of global warming. In the last decades, the use of renewable and clean sources of energies such as solar and wind energies has been increased extensively....
Article
PV module encapsulation and glass covering processes play big role in reliability and performance of PV modules, especially under desert climatic conditions. In the present study, tests were carried out to compare the performance of five types of commercial glass cover and three types of commercial PV module encapsulates. The relative advantages of...
Article
Full-text available
Conventional small-scale adsorption chillers generally employ silica-gel/water or zeolite/water working pairs given the relatively high level of mesoporosity and water affinity in these adsorbent materials. However, the coefficient of performance (COP) and specific cooling power (SCP) evaluated for the adsorption chiller using these adsorbent/adsor...
Article
The study presents the results of experimental and numerical investigations of oxy-combustion H2-enriched-CH4 diffusion flames in an atmospheric pressure swirl stabilized gas turbine model combustor. The flames characteristics in terms of temperature and species distributions, structures and flow fields are studied experimentally and numerically ov...
Article
Full-text available
Mud formed from environmental dust particles in humid ambient air significantly influences the performance of solar harvesting devices. This study examines the characterization of environmental dust particles and the chemo-mechanics of dry mud formed from dust particles. Analytical tools, including scanning electron microscopy, atomic force microsc...
Article
Direct combustion of fossils is a low efficiency process that leads to excessive carbon dioxide emissions. Highly efficient and clean combustion processes can be achieved by the use of hydrogen as fuel. Hydrogen can be produced by steam reforming of methane which is a highly endothermic process. Heat required for such endothermic process can be ach...
Article
Full-text available
Owing to recent climate changes, dust storms are increasingly common, particularly in the Middle East region. Dust accumulation and subsequent mud formation on solid surfaces in humid environments typically have adverse effects on surface properties such as optical transmittance, surface texture, and microhardness. This is usually because the mud,...
Article
Air-conditioning systems in Saudi Arabia consume approximately 65% of the electrical energy used in the building sector. Most air-conditioning systems in operation are of the vapor-compression variety. The use of solar energy to power such systems may save a large amount of electrical energy. Large-size commercial buildings in Saudi Arabia consume...
Article
Parabolic trough solar collectors can be used to drive endothermic reactions, such as methane reforming, while using molten salts as a heat transfer fluid. However, linear focus concentrators can only provide temperatures under 600 C, resulting in CH4 conversions well below 50%. The equilibrium can be shifted toward much higher conversions if H2 i...
Article
This study presents an experimental investigation of a solar thermal powered ammonia-water absorption refrigeration system. The focus of this study lies on the design of the components of the absorption chiller, the ice storages and the solar collector field as well as the integration of the data acquisition and control unit. An ammonia-water (NH3/...
Article
Metal organic frameworks (MOFs) have recently emerged as a center of attention among the class of more traditional porous materials including zeolites, activated carbons, and silica gels, due to their significantly larger pore volumes and tunability of pore geometry. A large amount of literature exists incorporating the gas adsorption and separatio...
Article
Today, fossil fuel is the primary extensively used source of energy. However, its negative impact on the environment have forced the energy research continuity to seriously consider renewable sources of energy. Solar energy, in particular, has been the main focus in this regard because it is a source of clean energy and naturally available. This st...
Article
Full-text available
The effect of texturing and anti-reflective coating of PV module glass cover on the overall performance of modules was investigated. The results indicate that texturing a module’s surface and adding an anti-reflective coating boosts the power output of a clean PV module by an average of 4–8%. Clean modules covered with an anti-reflective coating ex...
Article
Concentrated solar energy can be used to drive highly endothermic reactions, such as methane reforming. An attractive route is the parabolic trough technology, which is mature and relatively inexpensive but limited to temperatures below 600 °C, when methane conversions are low. However, high conversions are achievable if hydrogen is continuously re...
Article
For the last two centuries, fossil fuel has been considered and utilized as the main source of energy. However; the negative impacts of burning fossil fuel on the environment have forced the energy research continuity to seriously consider renewable sources of energy. Solar energy, in particular, has been the main focus in this regard because it is...
Article
Air-conditioning systems in Saudi Arabia consume approximately 65% of the electrical energy of the building sector, which amounts to approximately 70% of the electrical energy produced in this sector. Most of the air-conditioning systems used in Saudi Arabia are of the vapor-compression type. Using solar energy to power such systems will save a lar...
Article
The impact of unsteady solar intensity and ambient conditions on operation and performance parameters of an aqua-ammonia absorption chiller of 5 kW cooling power is explored. Unsteady analysis for five representative days in summer and winter in Dhahran, Saudi Arabia, is presented. The results give the variation of the absorption-chiller parameters...
Patent
Full-text available
A hybrid storage absorption refrigeration system and method. The system includes a thermal collector, a condenser, an evaporator, a cold storage tank, an absorber, a weak solution tank, a strong solution tank, a refrigerant storage tank, a refrigerant heat exchanger, and a solution heat exchanger. The method includes providing heat from a thermal c...
Article
Full-text available
The prediction of flowrates atwhich the vibration induced instability takes place in tubular heat exchangers due to cross flow is of major importance to the performance and service life of such equipment. In this paper, the semi analytical model is developed and utilized to study the triangular tube patterns. The developed mathematical model is tun...
Article
Full-text available
Flow maldistribution in heat exchanger tubes can significantly affect its performance. In this work, 16 tubes are connected between the inlet and the exit headers forming the heat exchanger. The feed nozzle is connected to the inlet header, and its connection point can be altered. The influences of inlet flow Reynolds number, nozzle diameter, numbe...
Article
Header tube arrangements are commonly used in the heat exchangers. This arrangement is used to distribute the flow from the header into several tubes to achieve the required heat exchange. The flow mal-distribution within the tubes occurs due to the development of vena-contracta at the inlet to the tubes. In order to reduce the flow mal-distributio...
Article
Full-text available
This paper presents the results of study on the effect of dust fouling on the transmittance of PV module glass cover. The study included the effect of dust fouling on overall plane glass transmittance, spectral transmittance of anti-reflective coated glass and characterization of the physical and chemical properties of dust particles. Also, micro-a...
Article
The prediction of flow rates at which the vibration-induced instability takes place in tubular heat exchangers due to crossflow is of major importance to the performance and service life of such equipment. In this paper, the semi-analytical model developed in [1] for square tube arrays was extended and utilized to study the triangular tube patterns...
Article
This paper presents a detailed comparative analysis between constant pressure and constant temperature aqua-ammonia absorption processes for an intermittent solar refrigerator. The results of the analysis indicate that constant pressure processes results in as high as 20% increase in coefficient of performance compared to constant temperature proce...
Article
As lateral dimensions of electromechanical devices are scaled down to length scales comparable to electron mean free paths, the influence of thickness effect on their properties becomes sine qua non. This paper presents a detailed study of thickness effect on the Young's modulus, residual stress, resistivity and Hall mobility of ultrathin_poly-Si(1...
Article
This study aims to investigate experimentally the natural convection flow over an array of discrete surfaces mounted on a flat vertical substrate. The investigation covers the case where the discrete surfaces/substrate unit forms a wall of a closed cavity. Experimental measurements of the flow and thermal fields were conducted. The experimental stu...
Article
There is a great potential for solar power utilization in the Eastern part of Saudi Arabia by employing solar photovoltaic (PV) modules. Dust accumulation on the surface of solar PV modules, mirrors, reflectors and other solar collectors is of great concern due to occasional to frequent dust storm in the gulf region. The performances of such device...
Article
Poly-SiGe can be used for monolithically integrating Micro/Nano-ElectroMechanical Systems (M/NEMS) with its driving circuitry in a MEMS-last approach. For these applications, it is important to have poly-SiGe films with a low tensile stress, a low resistivity and a high deposition rate. This paper presents a systematic procedure for the simultaneou...
Article
Conservation of useful form of energy, i.e. electricity to be used in the production sector rather than consumption sector is becoming a priority in the KSA (Kingdom of Saudi Arabia). One of the consumption sectors which utilize a large amount of electrical energy is the air-conditioning and refrigeration sector. Improving the performance of refrig...
Article
The paper presents the performance and economic analysis of a simple photovoltaic powered vapor compression refrigeration system carried out on winter days in the eastern province of the Kingdom of Saudi Arabia. The system has a 66 W DC refrigerator, 100 W PV mono-crystalline module and a 100 Ah battery bank. The thermal loads were distributed in t...
Article
A few properties of polycrystalline silicon germanium (poly-Si1−x Ge x ) films can be tailored by modulating the germanium incorporation. In this paper, the structural, mechanical and electrical properties of heavily doped ultrathin (~100 nm) poly-Si1−x Ge x films (0.84 ≤ x ≤ 0.88) fabricated by low-pressure chemical vapour deposition were investig...
Article
Ammonia is widely used as a refrigerant in absorption systems. Water is used as a solvent. For an adequate and accurate analysis of an absorption system's performance, it is important to be able to determine the thermodynamic properties of such a refrigerant-absorbent solution. This paper presents a set of seven polynomial forms of property correla...
Article
a b s t r a c t An integration of Taguchi method and artificial neural network (ANN) technique for the prediction of intrinsic stresses induced during plasma enhanced chemical vapor deposition (PECVD) of hydrogenated amorphous silicon (a-Si:H) thin films is presented. Inputs to the ANN model are plasma power, hydrogen dilution ratio, chamber pressu...
Conference Paper
It has been recognized that modeling of the complex dynamics of fluidelastic forces, that give rise to vibrations of tube bundles, requires a comprehensive dynamic model of high fidelity based on experimental insight. Accordingly, the prediction of the flow-induced vibration due to unsteady cross-flow can be greatly aided by semi-analytical models,...
Article
The air-conditioning and refrigeration systems in the Kingdom of Saudi Arabia consume more than 60% of the electrical energy of the building sector. Most of the used systems are of the vapor-compression type. Using solar energy to power such systems will save a large amount of energy (primary or electrical) that can be utilized by the production se...
Conference Paper
Full-text available
The adoption of amorphous silicon based solar cells has been drastically hindered by the low efficiency of these devices, which is mainly due to a low hole mobility. It has been shown that using both crystallized and amorphous silicon layers in solar cells leads to an enhancement of the device performance. In this study the crystallization of a-Si...
Article
Designing of an intermittently operating solar powered aqua-ammonia absorption system requires determination of design parameters such as operating pressures, operating aqua-ammonia concentrations, energy requirement of all components of the system, etc. These design parameters are mainly dependent on four operating temperatures, namely, the conden...
Article
Full-text available
The subject of the periodic vortex shedding behind bluff bodies, which exhibits oscillatory behaviour, is of direct relevance to many practical applications, e.g. pipelines and heat exchangers. Repetitive failures were occurring in associated piping components on the suction of a sales gas compressor. Available experimental investigations indicated...
Article
Full-text available
Hydrogenated amorphous silicon (a-Si:H) refers to a broad class of atomic configurations, sharing a lack of long-range order, but varying significantly in material properties, including optical constants, porosity, hydrogen content, and intrinsic stress. It has long been known that deposition conditions affect microstructure, but much work remains...
Article
This paper presents the results of experimental and numerical investigations of the problem of turbulent natural convection in a converging-plate vertical channel. The channel has two isothermally heated inclined walls and two adiabatic vertical side walls. The parameters involved in this study are the channel geometry represented by the channel wi...
Article
Zinc oxide (ZnO) nanostructures have been obtained by thermal oxidation of DC- sputtered Zinc film (Zn) above the melting temperature of Zinc. The zinc film is directly deposited on the glass substrate or on a ZnO layer pre-deposited on the glass by DC reactive plasma. The films were characterized by X-ray Diffraction before and after oxidation tre...
Article
This study presents the results of a numerical investigation of water circulation in an in-service boiler at full and part loads. Two different computational models were developed. The first model simulates the combustion process while the second model simulates water circulation inside the boiler tubes. The results include the heat flux distributi...
Article
This technical note communicates the thermal performance of a modified ten-Ton Refrigerant Direct Expansion (10-TR DX) air conditioning unit into a chiller under actual operating conditions. The modified unit achieved higher COP and cooling capacity compared with conventional DX. The increase in the unit cooling capacity is basically attributed to...
Article
The feasibility of using ground-coupled condensers for air-conditioning (A/C) systems in the Kingdom of Saudi Arabia has been investigated. Temperatures and soil properties required for the performance analysis of one of these condensers were determined experimentally. Thermal response tests were conducted to evaluate the effective thermal conducti...
Article
Full-text available
In this paper, different rates of steam flow (swing rates) are used to demonstrate the transient changes in both the drum-boiler steam pressure and the wall temperature levels in addition to stresses in the walls of steam risers. A MATLAB code was written to integrate the nonlinear dynamic governing equations for solving the water volume, the drum...
Article
The paper deals with the in situ experimental determination of the thermal properties of the underground soil for use in the design of borehole heat exchangers (BHE). The approach is based on recording the unsteady thermal response of a BHE that has been installed for the first time in Saudi Arabia. In this approach, the temperature of the circulat...
Article
This paper presents energy, exergy and uncertainty analyses for the thermal response test of a ground heat exchanger. In this study, a vertical U-shaped ground heat exchanger with 80 m depth and 20 cm borehole diameter is installed for the first time at the university premises in Saudi Arabia. A mobile thermal response apparatus is constructed and...
Article
Investigation of the evaluation of flow maldistribution in air-cooled heat exchangers is presented. The flow field in the inlet and return headers was obtained through the numerical solution of the governing partial differential equations including the conservation equations of mass and momentum in addition to the equations of the turbulence model....
Article
Full-text available
It has become evident that the modeling of the complex dynamics of fluidelastic forces that give rise to vibrations of tube bundles requires a great deal of experimental insight. Accordingly, the prediction of the flow-induced vibration due to unsteady cross-flow can be greatly aided by semi-analytical models, in which some coefficients are determi...
Article
Full-text available
This paper presents the fluid flow characteristics of natural convection flow in an anti-symmetrically heated parallel-plate vertical channel using the Particle Image Velocimetry (PIV) system. The channel walls were subjected to uniform temperature conditions, with one wall heated above ambient and the opposing wall maintained below ambient tempera...
Article
The present paper provides correlations of flow maldistribution parameters in air-cooled heat exchangers. The flow field in the inlet header was obtained through the numerical solution of the governing partial differential equations including the conservation equations of mass and momentum in addition to the equations of the turbulence model. The r...
Article
This paper presents the results of velocity measurements of natural convection in symmetrically heated vertical channel using the particle image velocimetry (PIV) system. Velocity measurements were conducted at three different sections on the horizontal plane to validate the flow two-dimensionality and at three different heights in the vertical pla...
Article
Erosion in the tube entrance region of a typical air-cooled heat exchanger is numerically predicted. The erosion rates are obtained for different flow rates and particle sizes assuming low particle concentration. The erosion prediction is based on using a mathematical model for simulating the fluid velocity field and another model for simulating th...
Article
Erosion is one of the major problems in many industrial processes, and in particular, in heat exchangers. The effects of flow velocity and sand particle size on the rate of erosion in a typical shell-and-tube heat exchanger were investigated numerically using the Lagrangian particle-tracking method. Erosion and penetration rates were obtained for s...
Article
The problem of buoyancy driven turbulent flow in parallel-plate channels is investigated. The investigation is limited to vertical channels of uniform cross-section with different modes of heating. The details of the flow and thermal fields are obtained from the solution of the conservation equations of mass, momentum, and energy in addition to equ...
Article
In this study, the fouling growth in a Naphtha heat exchanger of shell-and-tube type is determined using thermal analysis method. The thermal analysis method requires the calculations of shell and tube side heat transfer coefficients. The shell side heat transfer coefficient is determined using both Bell Delaware (BD) and Flow Stream Analyses (FSA)...
Article
Steady two-dimensional turbulent natural convection between inclined isothermal plates has been investigated numerically. Validations for the present computational procedure were carried out utilizing experimental and numerical data published in the literature. The comparisons with published data indicate very good agreement. The present calculatio...