Fayez Aldawi | Yanbu Industrial College (original) (raw)

Papers by Fayez Aldawi

Case Studies in Thermal Engineering, Aug 1, 2022

Case Studies in Thermal Engineering, Aug 1, 2022

Process Safety and Environmental Protection

Case Studies in Thermal Engineering

Case Studies in Thermal Engineering

Applied Thermal Engineering

International Journal of Electrical and Computer Engineering, Apr 1, 2022

Case Studies in Thermal Engineering

Solar simulator plays a vital role in the research and development of solar photovoltaic, solar t... more Solar simulator plays a vital role in the research and development of solar photovoltaic, solar thermal and builds environment. Producing uniformity in spatial, temporal and spectral radiation distribution are the key parameters when developing a solar simulator so the sun radiation is matched as closely as possible in the laboratory environment. This paper presents a development of a solar simulator for education and research purpose. The objective is to achieve a uniform spatial distribution of radiation from a set of halogen lamps. The simulator was built with eight 500W halogen lamps powered by typical domestic 220V source. The lamps are connected in two parallel four-in-series arrangement and placed perpendicularly from each other about halogen bulb axis. The distance between lamp reflectors edge was varied and total radiation measured by a pyranometer at various distance from the lamp. The findings showed that the optimal distance between reflector edges is 0.15 m which produc...

International Journal of Electrical and Computer Engineering (IJECE)

This study investigates the technical and cost-effective performance of options renewable energy ... more This study investigates the technical and cost-effective performance of options renewable energy sources to develop a green off-grid telecommunication tower to replace diesel generators in Malaysia. For this purpose, the solar, wind, pico-hydro energy, along with diesel generators, were examined to compare. In addition, the modeling of hybrid powering systems was conducted using hybrid optimization model for energy (HOMER) simulation based on techno-economic analysis to determine the optimal economically feasible system. The optimization findings showed that the hybrid high-efficiency fixed photovoltaic (PV) system with battery followed by 2 kW pico-hydropower and battery are the optimal configurations for powering off-grid telecommunication towers in Malaysia with the lowest net present cost (NPC) and cost of energy (COE). These costs of NPC and COE are more down than diesel generator costs with battery by 17.45%, 16.45%, 15.9%, and 15.5%, respectively. Furthermore, the economic ev...

One of the largest energy consumers is the residential household throughout world and subsequentl... more One of the largest energy consumers is the residential household throughout world and subsequently the sector produce a large percentage of greenhouse gas emission. The overall impact of the residential housing energy and materials consumption on global warming potential, ozone depletion, nitrification and acidification potential is significant. The ultra-energy efficient residential house envelopes utilising optimal thermal mass and insulation ensuring occupant comfort, energy savings and good indoor air quality and will not only reduce ongoing energy bills but also reduce consumption of fossil fuel and greenhouse gas emission. The paper describes thermal performances of a traditional and innovative house wall system for two climatic zones (moderate and arid climates). The energy performance has been evaluated using an Australia wide accredited energy performance simulation software AccuRate. The simulated results indicate a significant improvement in terms of energy savings of the...

For global warming and climatic change, the residential houses are used by the greenhouse gas whi... more For global warming and climatic change, the residential houses are used by the greenhouse gas which will consume more amount of fossil fuel energy. This energy is used for heating/cooling the house inside and some energy is waste or lost through the house wall. The modern house requires more space because of this energy efficient can reduce the dependency on fossil fuel at the same time the smart house wall systems are required to get better energy conservation. Here the study was considered on different climatic zones with all major cities. The objective of this study is to investigate and compare their performances with a conventional house envelope. The performance of heat loss through the wall has been evaluated using modeling software.

The residential housing sector is one of the largest energy consumers in the developed world and ... more The residential housing sector is one of the largest energy consumers in the developed world and subsequently the largest greenhouse gas emitter. The overall potential impact of the residential housing energy and materials consumption on global warming, ozone depletion, nitrification and acidification is significant. The ultra energy efficient residential house envelopes that utilises optimal thermal mass and insulation, ensuring occupant comfort, energy savings and good indoor air quality, will not only reduce ongoing energy bills but also reduce consumption of fossil fuel and greenhouse gas emissions. This paper describes the thermal performances of a conventional and new house wall system for two climatic zones (moderate and subtropical). The energy performance has been evaluated using an Australia wide accredited energy performance simulation software AccuRate. The simulated results indicate a significant improvement in terms of energy savings of the new house wall system compar...

Swimming is one of the most energy intensive sporting events, where a winner is decided by a shor... more Swimming is one of the most energy intensive sporting events, where a winner is decided by a short margin. The winning time margin can be increased by various means, including engineered outfits within the game's regulations. In swimming, apart from optimisation of the swimmer's body, an appropriately devised swimsuit can play a significant role in reducing the drag, thereby enhancing the winning time margin. The main motivation for undertaking this study stems from the increasing levels of technical sophistication in the swimsuits that are claimed by the manufacturers for performance enhancement. Therefore, the goal of this paper is to undertake an experimental study with microscopic illustration of the swimsuit fabric, and its effects on aerodynamic properties. The study utilised a commercial swimsuit under stretched and un-stretched conditions of fabric morphology, and their impact on aerodynamic drag. This study was conducted using a wind tunnel for a range of Reynolds n...

The study of building thermal performance is necessary to understand the energy needs and take ne... more The study of building thermal performance is necessary to understand the energy needs and take necessary measures for the reduction of greenhouse gas emission. A large percentage of energy is currently being consumed by the residential households globally. With current house wall construction systems and materials, it is difficult to achieve higher energy efficiency for ongoing heating and cooling. Therefore, the primary objectives of this study are to evaluate ongoing energy requirements for a conventional and an alternative house wall construction system for the use in two climatic conditions. The new house wall construction systems utilising new materials and modular systems will shorten the construction time and save cost. The energy performance study was undertaken using commercially available simulation software. The simulated results indicate that the new house wall systems have better thermal performance and significant energy savings. The findings also show that the percent...

Energy Reports

Abstract This numerical study is intended for the analysis of thermal convection induced by buoya... more Abstract This numerical study is intended for the analysis of thermal convection induced by buoyancy forces generated within a conical annular porous gap. The annulus was vertically positioned, it contains a discrete heat source and is filled with a Single-Walled Carbon Nanotubes-Water (SWCNT- H 2 O) nanoliquid exposed to a Lorentz force. To describe the porous medium in question, we have adopted the Darcy–Forchheimer model. Galerkin Finite Element Method (GFEM) has been used in this study to predict both thermal and hydrodynamic fields in the physical model. An extensive range of parameters are explored, i.e., the Rayleigh number (103 to 106), Hartman number Ha (1 to 100), and the volume fraction of nanoparticles (0 ≤ ϕ ≤ 0.08). For the purpose of exterminating the effects of heat source location on thermal and hydrodynamic fields, three locations (bottom, middle and upper) have been considered. Findings include current lines, isotherms, and Nusselt number evolution according to the previously stated variables. Predictably, our findings prove that heat transfer rate exhibits a decreasing function of Ha and an increasing function of Da and ϕ . Also, it was revealed that the convective regime is preponderant when the heat source was located in the bottom wall.

Case Studies in Thermal Engineering

Case Studies in Thermal Engineering

Abstract Application of thermoelectricity as the building air cooling system has not been commerc... more Abstract Application of thermoelectricity as the building air cooling system has not been commercialized yet. However, remarkable eco-friend characteristics of thermoelectricity encourages the researchers to enthusiastically work on different aspects of Peltier cooler to make its performance competitive with other cooling techniques. The contribution of this research is to explicitly clarify the real cooling cost made by a single popular and affordable thermoelectric module in the market under different working conditions and identify how the effective parameters can impact the cooling cost and performance of the cooler. To reach the aim of this research, a laboratory-scale thermoelectric air-water based cooler is fabricated to obtain the behavior of thermoelectric cooler under different air flow rates, room (air intake) temperatures, input power and so on. In the next step, the obtained results are employed to analyze the cost-effective features of the cooler under the mentioned working conditions. Based on the results, cost per kWh of cooling by a thermoelectric module can vary between 0.7 and 1.4 dollar depending on the range of mentioned parameters. It is interesting that, an extremum point is observed for input power of 23 W through which the cost of air cooling process is minimized and then is increased. Hence, number of employed thermoelectric modules in real big size cooler will be a key parameter to allocate an optimum input power for any individual thermoelectric module. Moreover, the cost of cooling is reduced for warmer air temperatures which shows the suitability of thermoelectric coolers for hot regions.

Case Studies in Thermal Engineering, Aug 1, 2022

Case Studies in Thermal Engineering, Aug 1, 2022

Process Safety and Environmental Protection

Case Studies in Thermal Engineering

Case Studies in Thermal Engineering

Applied Thermal Engineering

International Journal of Electrical and Computer Engineering, Apr 1, 2022

Case Studies in Thermal Engineering

Solar simulator plays a vital role in the research and development of solar photovoltaic, solar t... more Solar simulator plays a vital role in the research and development of solar photovoltaic, solar thermal and builds environment. Producing uniformity in spatial, temporal and spectral radiation distribution are the key parameters when developing a solar simulator so the sun radiation is matched as closely as possible in the laboratory environment. This paper presents a development of a solar simulator for education and research purpose. The objective is to achieve a uniform spatial distribution of radiation from a set of halogen lamps. The simulator was built with eight 500W halogen lamps powered by typical domestic 220V source. The lamps are connected in two parallel four-in-series arrangement and placed perpendicularly from each other about halogen bulb axis. The distance between lamp reflectors edge was varied and total radiation measured by a pyranometer at various distance from the lamp. The findings showed that the optimal distance between reflector edges is 0.15 m which produc...

International Journal of Electrical and Computer Engineering (IJECE)

This study investigates the technical and cost-effective performance of options renewable energy ... more This study investigates the technical and cost-effective performance of options renewable energy sources to develop a green off-grid telecommunication tower to replace diesel generators in Malaysia. For this purpose, the solar, wind, pico-hydro energy, along with diesel generators, were examined to compare. In addition, the modeling of hybrid powering systems was conducted using hybrid optimization model for energy (HOMER) simulation based on techno-economic analysis to determine the optimal economically feasible system. The optimization findings showed that the hybrid high-efficiency fixed photovoltaic (PV) system with battery followed by 2 kW pico-hydropower and battery are the optimal configurations for powering off-grid telecommunication towers in Malaysia with the lowest net present cost (NPC) and cost of energy (COE). These costs of NPC and COE are more down than diesel generator costs with battery by 17.45%, 16.45%, 15.9%, and 15.5%, respectively. Furthermore, the economic ev...

One of the largest energy consumers is the residential household throughout world and subsequentl... more One of the largest energy consumers is the residential household throughout world and subsequently the sector produce a large percentage of greenhouse gas emission. The overall impact of the residential housing energy and materials consumption on global warming potential, ozone depletion, nitrification and acidification potential is significant. The ultra-energy efficient residential house envelopes utilising optimal thermal mass and insulation ensuring occupant comfort, energy savings and good indoor air quality and will not only reduce ongoing energy bills but also reduce consumption of fossil fuel and greenhouse gas emission. The paper describes thermal performances of a traditional and innovative house wall system for two climatic zones (moderate and arid climates). The energy performance has been evaluated using an Australia wide accredited energy performance simulation software AccuRate. The simulated results indicate a significant improvement in terms of energy savings of the...

For global warming and climatic change, the residential houses are used by the greenhouse gas whi... more For global warming and climatic change, the residential houses are used by the greenhouse gas which will consume more amount of fossil fuel energy. This energy is used for heating/cooling the house inside and some energy is waste or lost through the house wall. The modern house requires more space because of this energy efficient can reduce the dependency on fossil fuel at the same time the smart house wall systems are required to get better energy conservation. Here the study was considered on different climatic zones with all major cities. The objective of this study is to investigate and compare their performances with a conventional house envelope. The performance of heat loss through the wall has been evaluated using modeling software.

The residential housing sector is one of the largest energy consumers in the developed world and ... more The residential housing sector is one of the largest energy consumers in the developed world and subsequently the largest greenhouse gas emitter. The overall potential impact of the residential housing energy and materials consumption on global warming, ozone depletion, nitrification and acidification is significant. The ultra energy efficient residential house envelopes that utilises optimal thermal mass and insulation, ensuring occupant comfort, energy savings and good indoor air quality, will not only reduce ongoing energy bills but also reduce consumption of fossil fuel and greenhouse gas emissions. This paper describes the thermal performances of a conventional and new house wall system for two climatic zones (moderate and subtropical). The energy performance has been evaluated using an Australia wide accredited energy performance simulation software AccuRate. The simulated results indicate a significant improvement in terms of energy savings of the new house wall system compar...

Swimming is one of the most energy intensive sporting events, where a winner is decided by a shor... more Swimming is one of the most energy intensive sporting events, where a winner is decided by a short margin. The winning time margin can be increased by various means, including engineered outfits within the game's regulations. In swimming, apart from optimisation of the swimmer's body, an appropriately devised swimsuit can play a significant role in reducing the drag, thereby enhancing the winning time margin. The main motivation for undertaking this study stems from the increasing levels of technical sophistication in the swimsuits that are claimed by the manufacturers for performance enhancement. Therefore, the goal of this paper is to undertake an experimental study with microscopic illustration of the swimsuit fabric, and its effects on aerodynamic properties. The study utilised a commercial swimsuit under stretched and un-stretched conditions of fabric morphology, and their impact on aerodynamic drag. This study was conducted using a wind tunnel for a range of Reynolds n...

The study of building thermal performance is necessary to understand the energy needs and take ne... more The study of building thermal performance is necessary to understand the energy needs and take necessary measures for the reduction of greenhouse gas emission. A large percentage of energy is currently being consumed by the residential households globally. With current house wall construction systems and materials, it is difficult to achieve higher energy efficiency for ongoing heating and cooling. Therefore, the primary objectives of this study are to evaluate ongoing energy requirements for a conventional and an alternative house wall construction system for the use in two climatic conditions. The new house wall construction systems utilising new materials and modular systems will shorten the construction time and save cost. The energy performance study was undertaken using commercially available simulation software. The simulated results indicate that the new house wall systems have better thermal performance and significant energy savings. The findings also show that the percent...

Energy Reports

Abstract This numerical study is intended for the analysis of thermal convection induced by buoya... more Abstract This numerical study is intended for the analysis of thermal convection induced by buoyancy forces generated within a conical annular porous gap. The annulus was vertically positioned, it contains a discrete heat source and is filled with a Single-Walled Carbon Nanotubes-Water (SWCNT- H 2 O) nanoliquid exposed to a Lorentz force. To describe the porous medium in question, we have adopted the Darcy–Forchheimer model. Galerkin Finite Element Method (GFEM) has been used in this study to predict both thermal and hydrodynamic fields in the physical model. An extensive range of parameters are explored, i.e., the Rayleigh number (103 to 106), Hartman number Ha (1 to 100), and the volume fraction of nanoparticles (0 ≤ ϕ ≤ 0.08). For the purpose of exterminating the effects of heat source location on thermal and hydrodynamic fields, three locations (bottom, middle and upper) have been considered. Findings include current lines, isotherms, and Nusselt number evolution according to the previously stated variables. Predictably, our findings prove that heat transfer rate exhibits a decreasing function of Ha and an increasing function of Da and ϕ . Also, it was revealed that the convective regime is preponderant when the heat source was located in the bottom wall.

Case Studies in Thermal Engineering

Case Studies in Thermal Engineering

Abstract Application of thermoelectricity as the building air cooling system has not been commerc... more Abstract Application of thermoelectricity as the building air cooling system has not been commercialized yet. However, remarkable eco-friend characteristics of thermoelectricity encourages the researchers to enthusiastically work on different aspects of Peltier cooler to make its performance competitive with other cooling techniques. The contribution of this research is to explicitly clarify the real cooling cost made by a single popular and affordable thermoelectric module in the market under different working conditions and identify how the effective parameters can impact the cooling cost and performance of the cooler. To reach the aim of this research, a laboratory-scale thermoelectric air-water based cooler is fabricated to obtain the behavior of thermoelectric cooler under different air flow rates, room (air intake) temperatures, input power and so on. In the next step, the obtained results are employed to analyze the cost-effective features of the cooler under the mentioned working conditions. Based on the results, cost per kWh of cooling by a thermoelectric module can vary between 0.7 and 1.4 dollar depending on the range of mentioned parameters. It is interesting that, an extremum point is observed for input power of 23 W through which the cost of air cooling process is minimized and then is increased. Hence, number of employed thermoelectric modules in real big size cooler will be a key parameter to allocate an optimum input power for any individual thermoelectric module. Moreover, the cost of cooling is reduced for warmer air temperatures which shows the suitability of thermoelectric coolers for hot regions.