Pub Date : 2024-12-01DOI: 10.1016/j.jksues.2022.06.004
Néstor D. Montiel-Bohórquez, Andrés F. Agudelo, Juan F. Pérez
The development of a steady-state model of an Integrated Plasma Gasification Combined Cycle (IPGCC) power plant is presented here. The model includes the plasma gasifier, syngas conditioning units, and the power generation unit. Furthermore, the model of each component implemented in Aspen Plus is described in detail (thermodynamic method, chemical reactions, and operative conditions). The proposed model was validated by comparing the plasma gasification results with experimental and numerical data from the literature; the relative error was 6.23% and 5.24%, respectively. The model was then used to perform a two-part sensitivity analysis. In the first part, simulations with municipal solid waste (MSW) with a moisture content varying from 20% to 60% were performed. The moisture content increment reduced the torch-specific power consumption by 53%. However, because of the increasing specific fuel consumption, the thermal efficiency of the IPGCC power plant also decreased by 28% as the MSW moisture content increased from 20% to 60%. In the second part, it was determined that the IPGCC power plant reached the best performance (32.5%) when a high plasma temperature (5000 °C) and a low gasification temperature (2000 °C) were used. At these highest efficiency conditions, the 1000 t/day IPGGC power plant’s net power generation was 62 MWe.
{"title":"Modelling of an Integrated Plasma Gasification Combined Cycle power plant using Aspen Plus","authors":"Néstor D. Montiel-Bohórquez, Andrés F. Agudelo, Juan F. Pérez","doi":"10.1016/j.jksues.2022.06.004","DOIUrl":"10.1016/j.jksues.2022.06.004","url":null,"abstract":"<div><div>The development of a steady-state model of an Integrated Plasma Gasification Combined Cycle (IPGCC) power plant is presented here. The model includes the plasma gasifier, syngas conditioning units, and the power generation unit. Furthermore, the model of each component implemented in Aspen Plus is described in detail (thermodynamic method, chemical reactions, and operative conditions). The proposed model was validated by comparing the plasma gasification results with experimental and numerical data from the literature; the relative error was 6.23% and 5.24%, respectively. The model was then used to perform a two-part sensitivity analysis. In the first part, simulations with municipal solid waste (MSW) with a moisture content varying from 20% to 60% were performed. The moisture content increment reduced the torch-specific power consumption by 53%. However, because of the increasing specific fuel consumption, the thermal efficiency of the IPGCC power plant also decreased by 28% as the MSW moisture content increased from 20% to 60%. In the second part, it was determined that the IPGCC power plant reached the best performance (32.5%) when a high plasma temperature (5000 °C) and a low gasification temperature (2000 °C) were used. At these highest efficiency conditions, the 1000 t/day IPGGC power plant’s net power generation was 62 MWe.</div></div>","PeriodicalId":35558,"journal":{"name":"Journal of King Saud University, Engineering Sciences","volume":"36 8","pages":"Pages 620-631"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77237817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Modern power system faces a severe problem of instability, largely due to inconsistent reactive power. It causes damage to the power grid within a few milliseconds. Therefore, proper management of reactive power under disturbing situations plays a key role in its safe operation. Devices such as flexible alternating current transmission systems (FACTS) accurately manage the system’s reactive power in accordance with the load demand. In this study, a new reactive power control strategy is employed for optimization of the reactive power along with the stability improvement of the system under different small perturbed conditions. Therefore, this study focuses on controlling the reactive power for an isolated wind-diesel hybrid power system model (WDHPSM) with the aid of a static synchronous compensator (STATCOM) together with the use of an integral minus proportional derivative (IPD) controller keeping a derivative-based filter (IPDF) as a secondary controller for better utilization of its purpose. The obtained results are compared when the no-control strategy is applied in the model. Another comparison has been done between the multiple applied soft computing techniques (oppositional harmonic search, ant lion optimization, binary-coded genetic algorithm, and symbiosis organisms search) that optimize the parameters of the controller of WDHPSM.
{"title":"Intelligent reactive power control of a renewable integrated hybrid energy system model using static synchronous compensators and soft computing techniques","authors":"Pabitra Kumar Guchhait , Samrat Chakraborty , Debottam Mukherjee , Ramashis Banerjee","doi":"10.1016/j.jksues.2022.03.004","DOIUrl":"10.1016/j.jksues.2022.03.004","url":null,"abstract":"<div><div>Modern power system faces a severe problem of instability, largely due to inconsistent reactive power. It causes damage to the power grid within a few milliseconds. Therefore, proper management of reactive power under disturbing situations plays a key role in its safe operation. Devices such as flexible alternating current transmission systems (FACTS) accurately manage the system’s reactive power in accordance with the load demand. In this study, a new reactive power control strategy is employed for optimization of the reactive power along with the stability improvement of the system under different small perturbed conditions. Therefore, this study focuses on controlling the reactive power for an isolated wind-diesel hybrid power system model (WDHPSM) with the aid of a static synchronous compensator (STATCOM) together with the use of an integral minus proportional derivative (IPD) controller keeping a derivative-based filter (IPDF) as a secondary controller for better utilization of its purpose. The obtained results are compared when the no-control strategy is applied in the model. Another comparison has been done between the multiple applied soft computing techniques (oppositional harmonic search, ant lion optimization, binary-coded genetic algorithm, and symbiosis organisms search) that optimize the parameters of the controller of WDHPSM.</div></div>","PeriodicalId":35558,"journal":{"name":"Journal of King Saud University, Engineering Sciences","volume":"36 8","pages":"Pages 562-571"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80089166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-01DOI: 10.1016/j.jksues.2021.10.009
A.A.P. Susastriawan, Y. Purwanto, B.W. Sidharta, G. Wahyu, T. Trisna, R.A. Setiawan
Traditional biomass stoves are widely used for cooking purposes in developing countries due to their simple construction. However, the problems of low thermal efficiency, large feedstock consumption, and high pollutant emissions are encountered in the conventional design. The gasification-based stove has also been presently and highly considered when encountering these problems. Therefore, this study aims to (1) develop a producer gas stove and (2) investigate the effect of bluff-body shape, equivalence ratio, and feedstock on the thermal performance of the stove. The results showed that the performance of the producer gas stove was affected by the bluff-body shape of the burner, equivalence ratio, and feedstock type. Stable flames were further observed when the bluff body B was attached to the burner. The highest thermal performance was obtained by using a bluff body B, operated at an equivalence ratio of 0.5 with blended feedstock of rice husksawdust. In addition, the highest heating rate and thermal efficiencies were 2.27 kW and 17.6%, respectively.
{"title":"Producer gas stove: Design, fabrication, and evaluation of thermal performance","authors":"A.A.P. Susastriawan, Y. Purwanto, B.W. Sidharta, G. Wahyu, T. Trisna, R.A. Setiawan","doi":"10.1016/j.jksues.2021.10.009","DOIUrl":"10.1016/j.jksues.2021.10.009","url":null,"abstract":"<div><div>Traditional biomass stoves are widely used for cooking purposes in developing countries due to their simple construction. However, the problems of low thermal efficiency, large feedstock consumption, and high pollutant emissions are encountered in the conventional design. The gasification-based stove has also been presently and highly considered when encountering these problems. Therefore, this study aims to (1) develop a producer gas stove and (2) investigate the effect of bluff-body shape, equivalence ratio, and feedstock on the thermal performance of the stove. The results showed that the performance of the producer gas stove was affected by the bluff-body shape of the burner, equivalence ratio, and feedstock type. Stable flames were further observed when the bluff body B was attached to the burner. The highest thermal performance was obtained by using a bluff body B, operated at an equivalence ratio of 0.5 with blended feedstock of rice husksawdust. In addition, the highest heating rate and thermal efficiencies were 2.27 kW and 17.6%, respectively.</div></div>","PeriodicalId":35558,"journal":{"name":"Journal of King Saud University, Engineering Sciences","volume":"36 8","pages":"Pages 701-708"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91088966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Construction risk can be described as the possibility of an incident that will harm the project’s feasibility. Different threats that impact businesses may be found in the construction industry as elsewhere. Moreover, construction projects face significant risks that put building projects at the risk of cost, over time, and poor standard of execution. In the last two years, Lebanon has been suffering from a severe economic crisis, which has affected a large number of businesses and industries, specifically the construction industry. Therefore, this article aims to identify, classify, and analyse the most significant risks inherent in the Lebanese construction industry with special emphasis on the financial and economic risk category and eventually establish a conclusion in this regard. To achieve the aims of this research, the data were collected by conducting a questionnaire survey among experts in the Lebanese construction industry. The results showed that the construction industry in Lebanon is exposed to many risk sources, internal and external, and the most important ones are financial risks such as fluctuation of the currency, inflation, and lack of solvency. Finally, the importance and benefits of implementing risk management are discussed in this research as well as the barriers to its effective implementation.
{"title":"Financial risk management in the construction projects","authors":"Abdussalam Shibani, Dyaa Hasan, Jalal Saaifan, Heba Sabboubeh, Mohamad Eltaip, Messaoud Saidani, Nawal Gherbal","doi":"10.1016/j.jksues.2022.05.001","DOIUrl":"10.1016/j.jksues.2022.05.001","url":null,"abstract":"<div><div>Construction risk can be described as the possibility of an incident that will harm the project’s feasibility. Different threats that impact businesses may be found in the construction industry as elsewhere. Moreover, construction projects face significant risks that put building projects at the risk of cost, over time, and poor standard of execution. In the last two years, Lebanon has been suffering from a severe economic crisis, which has affected a large number of businesses and industries, specifically the construction industry. Therefore, this article aims to identify, classify, and analyse the most significant risks inherent in the Lebanese construction industry with special emphasis on the financial and economic risk category and eventually establish a conclusion in this regard. To achieve the aims of this research, the data were collected by conducting a questionnaire survey among experts in the Lebanese construction industry. The results showed that the construction industry in Lebanon is exposed to many risk sources, internal and external, and the most important ones are financial risks such as fluctuation of the currency, inflation, and lack of solvency. Finally, the importance and benefits of implementing risk management are discussed in this research as well as the barriers to its effective implementation.</div></div>","PeriodicalId":35558,"journal":{"name":"Journal of King Saud University, Engineering Sciences","volume":"36 8","pages":"Pages 552-561"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76062529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-01DOI: 10.1016/j.jksues.2022.01.002
Vidya Nitin More, Vibha Vyas
The prominent reason behind road accidents during the winter season is the presence of fog in the environment. Other important reasons for the degradation of visibility are haze, smog, clouds and rain. In the process of developing the automation of a vehicle on the road, visibility and contrast are the most affected parameters of the captured image or video. Road accidents can be prevented if images taken in foggy conditions are processed to improve their quality and legibility. There are different methods available to improve the quality of foggy images, like color attenuation prior method, dark channel prior method, and fog removal using region detection network.
The atmospheric particles, such as water droplets, which cause the absorption and scattering of light, further produce attenuation and air-light. The present research work is based on the Dark Channel Prior (DCP) method. The DCP method needs to find the transmission map, which gives the strength of the fog in the image. Major parts of this algorithm are the estimation of the dark channel, finding the transmission map, refining the transmission map, and reconstructing the image without haze. The proposed algorithm has also been implemented using a Raspberry pi. This research work focuses on the improvement of the reconstructed de-hazed image using various filters. The results are compared based on Contrast Gain (CG) and Color Index (CI) parameters. Many times, this application needs the object detection phase, which uses various methods; however, the scope of this paper is limited to the reconstruction of the image after the removal of fog.
{"title":"Removal of fog from hazy images and their restoration","authors":"Vidya Nitin More, Vibha Vyas","doi":"10.1016/j.jksues.2022.01.002","DOIUrl":"10.1016/j.jksues.2022.01.002","url":null,"abstract":"<div><div>The prominent reason behind road accidents during the winter season is the presence of fog in the environment. Other important reasons for the degradation of visibility are haze, smog, clouds and rain. In the process of developing the automation of a vehicle on the road, visibility and contrast are the most affected parameters of the captured image or video. Road accidents can be prevented if images taken in foggy conditions are processed to improve their quality and legibility. There are different methods available to improve the quality of foggy images, like color attenuation prior method, dark channel prior method, and fog removal using region detection network.</div><div>The atmospheric particles, such as water droplets, which cause the absorption and scattering of light, further produce attenuation and air-light. The present research work is based on the Dark Channel Prior (DCP) method. The DCP method needs to find the transmission map, which gives the strength of the fog in the image. Major parts of this algorithm are the estimation of the dark channel, finding the transmission map, refining the transmission map, and reconstructing the image without haze. The proposed algorithm has also been implemented using a Raspberry pi. This research work focuses on the improvement of the reconstructed de-hazed image using various filters. The results are compared based on Contrast Gain (CG) and Color Index (CI) parameters. Many times, this application needs the object detection phase, which uses various methods; however, the scope of this paper is limited to the reconstruction of the image after the removal of fog.</div></div>","PeriodicalId":35558,"journal":{"name":"Journal of King Saud University, Engineering Sciences","volume":"36 8","pages":"Pages 600-610"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84824067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-01DOI: 10.1016/j.jksues.2022.01.007
Jun Sun , Zhenhong Yue , Yan He , Yasir Ibrahim Shah
To analyze the horizontal shear resistance participation degree of the shear studs on the web and diaphragm flange in the negative moment area of the steel–concrete continuous composite box girder, the steel–concrete composite girder specimen was designed and manufactured based on the existing codes. The shear deformation of the two parts of the studs in the composite box girder is studied by the finite element parameter analysis of the nonlinear shear deformation of the studs and the stress analysis of the diaphragm. The results show that web flange studs provide the horizontal shear capacity of the steel–concrete composite box girder. The installation of baffle flange studs cannot improve the shear connection degree of composite beams. Removal of the flange stud from the diaphragm can relieve the force on the diaphragm and provide a theoretical basis for reducing the stiffeners of the diaphragm.
{"title":"Slip analysis of prestressed steel-concrete continuous composite beam","authors":"Jun Sun , Zhenhong Yue , Yan He , Yasir Ibrahim Shah","doi":"10.1016/j.jksues.2022.01.007","DOIUrl":"10.1016/j.jksues.2022.01.007","url":null,"abstract":"<div><div>To analyze the horizontal shear resistance participation degree of the shear studs on the web and diaphragm flange in the negative moment area of the steel–concrete continuous composite box girder, the steel–concrete composite girder specimen was designed and manufactured based on the existing codes. The shear deformation of the two parts of the studs in the composite box girder is studied by the finite element parameter analysis of the nonlinear shear deformation of the studs and the stress analysis of the diaphragm. The results show that web flange studs provide the horizontal shear capacity of the steel–concrete composite box girder. The installation of baffle flange studs cannot improve the shear connection degree of composite beams. Removal of the flange stud from the diaphragm can relieve the force on the diaphragm and provide a theoretical basis for reducing the stiffeners of the diaphragm.</div></div>","PeriodicalId":35558,"journal":{"name":"Journal of King Saud University, Engineering Sciences","volume":"36 8","pages":"Pages 535-542"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75459546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-01DOI: 10.1016/j.jksues.2021.07.007
Devita Rachmat , Ra'idah Syarifah , Intan Paramudita , Nur Fadhilah , Muhammad Husain Haekal , Ruri Agung Wahyuono , Rachmat Hidayat , Rozalina Zakaria , Veinardi Suendo , Doty Dewi Risanti
This study investigates the morphological effect of different Au-doped SiO2 scattering layers on the performance of dye-sensitized solar cells (DSSCs). Particularly, the SiO2 sources were varied to yield different geometries, i.e., tetraethyl orthosilicate (TEOS) templated SiO2, Sidoarjo mud (LuSi) extracted SiO2, and commercial silica glass sphere. The microstructure, as well as physical, electronic, and optical properties of different Au-doped SiO2 particles, were characterized using SEM-EDX, TEM, BET, XRD, and various spectroscopy techniques. The photoelectrochemical performance of quasi-solid state DSSCs was indicated by current density–voltage (J-V) response, external quantum efficiency spectra, and the impedance response. The results indicate that the performance of TiO2-based DSSCs is enhanced quite significantly due to the improved photocurrent generation and fill factor. The short circuit current density is found up to 370% higher (and hence, the conversion efficiency) than the reference cell upon incorporating Au-doped crystalline SiO2 extracted from LuSi (Voc = 0.89 V, Jsc = 1.28 mA‧cm−2, FF = 0.65, and η = 0.75%). This substantial photocurrent enhancement stems from the combined effect of efficient light scattering by submicron SiO2 particles, surface plasmon resonance, and reduced interfacial recombination by SiO2 insulation. In addition, the optimum size of SiO2 particles is deduced as the results indicate the size-scattering dependency which controls the gain and loss of photocurrent due to the type of scattering.
{"title":"Au-doped mesoporous SiO2 scattering layer enhances light harvesting in quasi Solid-State dye-sensitized solar cells","authors":"Devita Rachmat , Ra'idah Syarifah , Intan Paramudita , Nur Fadhilah , Muhammad Husain Haekal , Ruri Agung Wahyuono , Rachmat Hidayat , Rozalina Zakaria , Veinardi Suendo , Doty Dewi Risanti","doi":"10.1016/j.jksues.2021.07.007","DOIUrl":"10.1016/j.jksues.2021.07.007","url":null,"abstract":"<div><div>This study investigates the morphological effect of different Au-doped SiO<sub>2</sub> scattering layers on the performance of dye-sensitized solar cells (DSSCs). Particularly, the SiO<sub>2</sub> sources were varied to yield different geometries, i.e., tetraethyl orthosilicate (TEOS) templated SiO<sub>2</sub>, Sidoarjo mud (LuSi) extracted SiO<sub>2</sub>, and commercial silica glass sphere. The microstructure, as well as physical, electronic, and optical properties of different Au-doped SiO<sub>2</sub> particles, were characterized using SEM-EDX, TEM, BET, XRD, and various spectroscopy techniques. The photoelectrochemical performance of quasi-solid state DSSCs was indicated by current density–voltage (J-V) response, external quantum efficiency spectra, and the impedance response. The results indicate that the performance of TiO<sub>2</sub>-based DSSCs is enhanced quite significantly due to the improved photocurrent generation and fill factor. The short circuit current density is found up to 370% higher (and hence, the conversion efficiency) than the reference cell upon incorporating Au-doped crystalline SiO<sub>2</sub> extracted from LuSi (V<sub>oc</sub> = 0.89 V, J<sub>sc</sub> = 1.28 mA‧cm<sup>−2</sup>, FF = 0.65, and η = 0.75%). This substantial photocurrent enhancement stems from the combined effect of efficient light scattering by submicron SiO<sub>2</sub> particles, surface plasmon resonance, and reduced interfacial recombination by SiO<sub>2</sub> insulation. In addition, the optimum size of SiO<sub>2</sub> particles is deduced as the results indicate the size-scattering dependency which controls the gain and loss of photocurrent due to the type of scattering.</div></div>","PeriodicalId":35558,"journal":{"name":"Journal of King Saud University, Engineering Sciences","volume":"36 8","pages":"Pages 581-590"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83362149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-01DOI: 10.1016/j.jksues.2024.12.002
Anis H. Fakeeha (Editor-in-Chief)
{"title":"Acknowledgment to Reviewers","authors":"Anis H. Fakeeha (Editor-in-Chief)","doi":"10.1016/j.jksues.2024.12.002","DOIUrl":"10.1016/j.jksues.2024.12.002","url":null,"abstract":"","PeriodicalId":35558,"journal":{"name":"Journal of King Saud University, Engineering Sciences","volume":"36 8","pages":"Page 717"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143154508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-01DOI: 10.1016/j.jksues.2021.10.001
J.S. D'Cotha , P. Sajeesh , P.R. Suresh , J. Jithu
Augmenting the productivity of fresh water with minimum environmental impact is a challenging task for researchers across the globe. Solar desalination is an environment-friendly approach with minimum CO2 emissions. Researchers have investigated the influence of different design and operating variables to enhance the distillate productivity using passive-type stepped solar stills. The stepped solar stills were similar in shape and size compared to the conventional solar still and had increased distillate output. The influence of cavity volume space, the depth of water, and the surface area of the absorber in contact with the saline water on the distillate output is discussed in this paper. Most researchers proved the fact that stepped stills had higher productivity compared to conventional stills. In this review, an attempt is made to discuss the different design and operating parameters influencing the productivity of stepped still.
{"title":"Inherent configuration characteristics altering the distillate enhancement of passive stepped solar still: A review","authors":"J.S. D'Cotha , P. Sajeesh , P.R. Suresh , J. Jithu","doi":"10.1016/j.jksues.2021.10.001","DOIUrl":"10.1016/j.jksues.2021.10.001","url":null,"abstract":"<div><div>Augmenting the productivity of fresh water with minimum environmental impact is a challenging task for researchers across the globe. Solar desalination is an environment-friendly approach with minimum CO<sub>2</sub> emissions. Researchers have investigated the influence of different design and operating variables to enhance the distillate productivity using passive-type stepped solar stills. The stepped solar stills were similar in shape and size compared to the conventional solar still and had increased distillate output. The influence of cavity volume space, the depth of water, and the surface area of the absorber in contact with the saline water on the distillate output is discussed in this paper. Most researchers proved the fact that stepped stills had higher productivity compared to conventional stills. In this review, an attempt is made to discuss the different design and operating parameters influencing the productivity of stepped still.</div></div>","PeriodicalId":35558,"journal":{"name":"Journal of King Saud University, Engineering Sciences","volume":"36 8","pages":"Pages 684-693"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79011557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The use of natural materials to improve oil recovery and production is believed to be a suitable method. The current study examined hydrocolloids extracted from flaxseed as a viscosifying agent for improved and enhanced oil recovery EOR. It aimed to investigate the effect of concentration, temperature, salinity, and ageing time on the rheology of the flaxseed gel solution (FGS). The study also highlighted the solution’s performance at the core level for carbonate reservoirs. The FGS was successfully extracted by soaking and heating at 70 °C. Fourier-transform infrared (FTIR) spectroscopy results showed polysaccharide dominance in the mucilage. The rheology outcomes showed that the FGS was able to increase the water viscosity by 5–17 cp at 25 °C. Different concentrations of the FGS preserved its viscosity at temperatures of 25–45 °C. The salinity reduced the gel’s viscosity, especially above 2.5 wt%. A 50 g/L solution successfully tolerated all the tested salinities and the temperature range at all shear rates. A reduction in viscosity was observed during the first five days of ageing due to biological degradation caused by bacteria. Ageing had no major influence between 5 and 10 days. The FGS resulted in a 12 % incremental oil recovery. The sweep efficiency improved due to the 84 % mobility enhancement. This study confirms the possibility of deploying hydrocolloids as a natural viscosifier to improve the oil recovery in Kazakhstan’s oil reservoir conditions.
{"title":"Evaluation of flaxseed hydrocolloid’s potential in improving oil recovery","authors":"Birzhan Mazhit, Azza Hashim Abbas, Peyman Pourafshary","doi":"10.1016/j.jksues.2023.10.003","DOIUrl":"10.1016/j.jksues.2023.10.003","url":null,"abstract":"<div><div>The use of natural materials to improve oil recovery and production is believed to be a suitable method. The current study examined hydrocolloids extracted from flaxseed as a viscosifying agent for improved and enhanced oil recovery EOR. It aimed to investigate the effect of concentration, temperature, salinity, and ageing time on the rheology of the flaxseed gel solution (FGS). The study also highlighted the solution’s performance at the core level for carbonate reservoirs. The FGS was successfully extracted by soaking and heating at 70 °C. Fourier-transform infrared (FTIR) spectroscopy results showed polysaccharide dominance in the mucilage. The rheology outcomes showed that the FGS was able to increase the water viscosity by 5–17 cp at 25 °C. Different concentrations of the FGS preserved its viscosity at temperatures of 25–45 °C. The salinity reduced the gel’s viscosity, especially above 2.5 wt%. A 50 g/L solution successfully tolerated all the tested salinities and the temperature range at all shear rates. A reduction in viscosity was observed during the first five days of ageing due to biological degradation caused by bacteria. Ageing had no major influence between 5 and 10 days. The FGS resulted in a 12 % incremental oil recovery. The sweep efficiency improved due to the 84 % mobility enhancement. This study confirms the possibility of deploying hydrocolloids as a natural viscosifier to improve the oil recovery in Kazakhstan’s oil reservoir conditions.</div></div>","PeriodicalId":35558,"journal":{"name":"Journal of King Saud University, Engineering Sciences","volume":"36 8","pages":"Pages 611-618"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136056392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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