Zhiwei Wang, Shuai Guo, Gaofeng Chen, Mengju Zhang, T. Sun, Yan Chen, Mengge Wu, Xiaofei Xin, Shuhua Yang, Tingzhou Lei, K. R. Burra, Ashwani K. Gupta
Continued social and mobility development has caused sharp increase in the number of waste tires, increased environmental pollution and waste of limited resources. Agricultural residues is a bioresource, which has drawn increased attention in recent years. The thermochemical conversion of waste tires and agricultural residues and their mixtures offers important prospects for scientific development, which can provide energy security and much reduced environmental footprint. In this paper, pyrolysis of waste tires (WT) and its co-pyrolysis with maize stalk (MS), wheat straw (WS), cotton stalk (CS), rape straw (RS) or peanut shell (PS) agricultural residues, in mass ratios of 1:1 were investigated at different heating rate using thermogravimetric analysis (TGA). The kinetic parameters were calculated using Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS) kinetic models at heating rates of 20, 30, and 50°C/min. The synergistic effect between waste tires and the agricultural residues was explored by calculating the deviation between the experimental and calculated values. The results showed the presence of a synergistic effect between the co-pyrolysis of waste tires and the residual agricultural residues. In the kinetic analysis, activation energies of waste tires, agricultural residues and their mixtures were calculated using the two models. The reaction followed a multistage reaction mechanism. The differential thermogravimetry (DTG) behavior of the mixture was similar to the weighted aggregate results of waste tire and agricultural waste samples, pyrolyzed separately. These results provide some insights on the combined treatment of waste tires and agricultural waste residues.
{"title":"Synergistic effects and kinetics in co-pyrolysis of waste tire with five agricultural residues using thermogravimetric analysis","authors":"Zhiwei Wang, Shuai Guo, Gaofeng Chen, Mengju Zhang, T. Sun, Yan Chen, Mengge Wu, Xiaofei Xin, Shuhua Yang, Tingzhou Lei, K. R. Burra, Ashwani K. Gupta","doi":"10.1115/1.4062826","DOIUrl":"https://doi.org/10.1115/1.4062826","url":null,"abstract":"\u0000 Continued social and mobility development has caused sharp increase in the number of waste tires, increased environmental pollution and waste of limited resources. Agricultural residues is a bioresource, which has drawn increased attention in recent years. The thermochemical conversion of waste tires and agricultural residues and their mixtures offers important prospects for scientific development, which can provide energy security and much reduced environmental footprint. In this paper, pyrolysis of waste tires (WT) and its co-pyrolysis with maize stalk (MS), wheat straw (WS), cotton stalk (CS), rape straw (RS) or peanut shell (PS) agricultural residues, in mass ratios of 1:1 were investigated at different heating rate using thermogravimetric analysis (TGA). The kinetic parameters were calculated using Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS) kinetic models at heating rates of 20, 30, and 50°C/min. The synergistic effect between waste tires and the agricultural residues was explored by calculating the deviation between the experimental and calculated values. The results showed the presence of a synergistic effect between the co-pyrolysis of waste tires and the residual agricultural residues. In the kinetic analysis, activation energies of waste tires, agricultural residues and their mixtures were calculated using the two models. The reaction followed a multistage reaction mechanism. The differential thermogravimetry (DTG) behavior of the mixture was similar to the weighted aggregate results of waste tire and agricultural waste samples, pyrolyzed separately. These results provide some insights on the combined treatment of waste tires and agricultural waste residues.","PeriodicalId":15676,"journal":{"name":"Journal of Energy Resources Technology-transactions of The Asme","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2023-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47322267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shashank Sharma Charlapally, Yogesh Biswal, G. M. Nayak, Karthick C, S. Balusamy, Nanthagopal K
The current research investigates the spray behavior of lemon peel oil (LPO) and butanol in a controlled environment under various engine-like conditions. The liquid spray morphology of both fuel blends is captured using a standard Mie scattering technique, and the liquid spray penetration length is compared to a baseline fuel isooctane. In order to simulate and create engine-like conditions, these experiments are carried out in a constant volume chamber under various pressure and temperature conditions. Furthermore, the combustion quality of binary and ternary blends is studied using an optical GDI engine at three different injection timings. According to the constant volume spray study, isooctane has the shortest penetration. Because of its higher boiling point, LPO has a longer liquid spray penetration length. Despite its lower boiling point, butanol penetrates better than isooctane. The temperature was also discovered to influence liquid spray tip penetration length more than pressure significantly. In-cylinder combustion imaging results also revealed that injection timing significantly impacts combustion. Although butanol improves combustion, LPO-dominant blends demonstrated more diffusion burning due to poor evaporation characteristics. The blends prepared for the study were similar to gasoline in combustion conditions. It was discovered that these blends ran optimally without requiring any modifications to existing engines, even though late injection is recommended to improve combustion quality and peak performance.
{"title":"Investigation on flame and spray characteristics of butanol and lemon peel oil blends with gasoline using optical engine","authors":"Shashank Sharma Charlapally, Yogesh Biswal, G. M. Nayak, Karthick C, S. Balusamy, Nanthagopal K","doi":"10.1115/1.4062827","DOIUrl":"https://doi.org/10.1115/1.4062827","url":null,"abstract":"\u0000 The current research investigates the spray behavior of lemon peel oil (LPO) and butanol in a controlled environment under various engine-like conditions. The liquid spray morphology of both fuel blends is captured using a standard Mie scattering technique, and the liquid spray penetration length is compared to a baseline fuel isooctane. In order to simulate and create engine-like conditions, these experiments are carried out in a constant volume chamber under various pressure and temperature conditions. Furthermore, the combustion quality of binary and ternary blends is studied using an optical GDI engine at three different injection timings. According to the constant volume spray study, isooctane has the shortest penetration. Because of its higher boiling point, LPO has a longer liquid spray penetration length. Despite its lower boiling point, butanol penetrates better than isooctane. The temperature was also discovered to influence liquid spray tip penetration length more than pressure significantly. In-cylinder combustion imaging results also revealed that injection timing significantly impacts combustion. Although butanol improves combustion, LPO-dominant blends demonstrated more diffusion burning due to poor evaporation characteristics. The blends prepared for the study were similar to gasoline in combustion conditions. It was discovered that these blends ran optimally without requiring any modifications to existing engines, even though late injection is recommended to improve combustion quality and peak performance.","PeriodicalId":15676,"journal":{"name":"Journal of Energy Resources Technology-transactions of The Asme","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2023-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42647026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Supercritical CO2 closed Brayton cycles are a major candidate for future power cycle designs in concentrating solar power applications, with high-temperature recuperators playing an essential role in realizing their high thermal efficiency. Printed circuit heat exchangers (PCHEs) are often chosen for this role due to their thermal-hydraulic and mechanical performance at high temperatures and pressures, all while remaining compact. However, PCHEs can be costly because of the high-performance materials demanded in these applications, and the heat exchanger internal geometry is restricted by their manufacturing process. Additively manufactured heat exchangers can address both of these shortcomings. This work proposes a modular bi-metal high-temperature recuperator with integrated headers to be produced with additive manufacturing. Beginning with existing PCHE channel geometries, a 1D heat exchanger model is developed. Then, multi-objective optimization is used to maximize the heat transfer effectiveness of a lab-scale device while limiting its size. Two distinct channel geometries emerge from the optimization. Optimal designs achieve up to 88% effectiveness with negligible pressure drop. Deterioration of effectiveness due to axial conduction of heat in the heat exchanger walls is found to be a notable problem for lab-scale PCHEs, and the optimal designs obtained here minimize its detrimental effects. A sensitivity analysis reveals that the effectiveness of the recuperator is much less sensitive to variation in mass flowrate in off-design operation when axial conduction is significant, while increasing the length of the device easily increases effectiveness.
{"title":"Multi-Objective Optimization of a Bi-Metal High-Temperature Recuperator for Application in Concentrating Solar Power","authors":"Jacob A. Bryan, Aiden S. Meek, Hailei Wang","doi":"10.1115/1.4062522","DOIUrl":"https://doi.org/10.1115/1.4062522","url":null,"abstract":"Abstract Supercritical CO2 closed Brayton cycles are a major candidate for future power cycle designs in concentrating solar power applications, with high-temperature recuperators playing an essential role in realizing their high thermal efficiency. Printed circuit heat exchangers (PCHEs) are often chosen for this role due to their thermal-hydraulic and mechanical performance at high temperatures and pressures, all while remaining compact. However, PCHEs can be costly because of the high-performance materials demanded in these applications, and the heat exchanger internal geometry is restricted by their manufacturing process. Additively manufactured heat exchangers can address both of these shortcomings. This work proposes a modular bi-metal high-temperature recuperator with integrated headers to be produced with additive manufacturing. Beginning with existing PCHE channel geometries, a 1D heat exchanger model is developed. Then, multi-objective optimization is used to maximize the heat transfer effectiveness of a lab-scale device while limiting its size. Two distinct channel geometries emerge from the optimization. Optimal designs achieve up to 88% effectiveness with negligible pressure drop. Deterioration of effectiveness due to axial conduction of heat in the heat exchanger walls is found to be a notable problem for lab-scale PCHEs, and the optimal designs obtained here minimize its detrimental effects. A sensitivity analysis reveals that the effectiveness of the recuperator is much less sensitive to variation in mass flowrate in off-design operation when axial conduction is significant, while increasing the length of the device easily increases effectiveness.","PeriodicalId":15676,"journal":{"name":"Journal of Energy Resources Technology-transactions of The Asme","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135090625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Efficient heating and cooling systems and renewable energy sources are crucial for effectively designing net-zero energy homes (NZEHs). The study proposes using a multi-functional variable refrigerant flow system with hydraulic heat recovery (MFVRF-H2R) to reduce HVAC and hot water energy usage, offering a practical approach to enable NZEH solutions. Photovoltaic (PV)-based on-site power generation is utilized to achieve zero-energy performance in residential buildings. A building energy simulation study is conducted to assess the effectiveness of the combined systems in various climate conditions. To develop the simulation model, the US National Institute of Standards and Technology (NIST)'s net-zero energy residential test facility is used as the benchmark for NZEH baseline models. The MFVRF-H2R system is incorporated into the NZEH baseline to propose a more-energy efficient design with heat recovery technology. eQUEST and post-processing calculations are used to simulate NZEH performance, comparing whole-building energy end-use and PV capacity for the baseline and alternative models with MFVRF-H2R. Results demonstrate that the proposed VRF-based NZEH design can provide potential energy savings of up to 32% for cooling energy under various climate zones. Moreover, the NZEH design with the proposed MFVRF-H2R can achieve up to a 90% reduction in domestic hot water usage compared to an NZEH design without VRF heat recovery technology. The study suggests that the MFVRF-H2R system can provide practical and realistic solutions for making HVAC energy-efficient by minimizing thermal waste and reusing it for other thermal parts of the building, such as hot water applications. Consequently, this study highlights the effectiveness of the MFVRF-H2R system in designing NZEHs while considering heat recovery and renewable energy technologies.
{"title":"Evaluation of Multi-Functional Variable Refrigerant Flow System with Thermal Energy Storage and Photovoltaic-Based Distributed System for Net-Zero Energy Home Design","authors":"Dongsu Kim, Kelly Tran, Jaeyoon Koh, Heejin Cho","doi":"10.1115/1.4062765","DOIUrl":"https://doi.org/10.1115/1.4062765","url":null,"abstract":"\u0000 Efficient heating and cooling systems and renewable energy sources are crucial for effectively designing net-zero energy homes (NZEHs). The study proposes using a multi-functional variable refrigerant flow system with hydraulic heat recovery (MFVRF-H2R) to reduce HVAC and hot water energy usage, offering a practical approach to enable NZEH solutions. Photovoltaic (PV)-based on-site power generation is utilized to achieve zero-energy performance in residential buildings. A building energy simulation study is conducted to assess the effectiveness of the combined systems in various climate conditions. To develop the simulation model, the US National Institute of Standards and Technology (NIST)'s net-zero energy residential test facility is used as the benchmark for NZEH baseline models. The MFVRF-H2R system is incorporated into the NZEH baseline to propose a more-energy efficient design with heat recovery technology. eQUEST and post-processing calculations are used to simulate NZEH performance, comparing whole-building energy end-use and PV capacity for the baseline and alternative models with MFVRF-H2R. Results demonstrate that the proposed VRF-based NZEH design can provide potential energy savings of up to 32% for cooling energy under various climate zones. Moreover, the NZEH design with the proposed MFVRF-H2R can achieve up to a 90% reduction in domestic hot water usage compared to an NZEH design without VRF heat recovery technology. The study suggests that the MFVRF-H2R system can provide practical and realistic solutions for making HVAC energy-efficient by minimizing thermal waste and reusing it for other thermal parts of the building, such as hot water applications. Consequently, this study highlights the effectiveness of the MFVRF-H2R system in designing NZEHs while considering heat recovery and renewable energy technologies.","PeriodicalId":15676,"journal":{"name":"Journal of Energy Resources Technology-transactions of The Asme","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42551672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A non-linear system identification approach was used to exploit the nonlinearly in the exergy of the system and reduce it into two or more interconnected elements. The Hammerstein-Wiener (H-W) methodology was adopted to describe the dynamics of a passive thermal system using a combination of nonlinear and linear blocks. Here, the linear block is a discrete transfer function which symbolizes the dynamic component of the model. The combination of Single Input Single Output (SISO) and Multiple Input Single Output (MISO) was adopted to develop the exergy model. The proposed model was validated using the state properties measured for the passive solar thermal system collector. The mean absolute percentage error (MAPE) for enthalpy changes falls in the domain of −0.01% to 0.01%, whereas it varied from −0.06% to 0.02% as the entropy of the system changed with time. Similarly, the MAPE encountered while evaluating the exergy of the system, was in the closed interval of −0.066% to −0.0017%. The average exergy gain by the H-W model across the Ist and IInd passages was, respectively, 0.90 kJ·kg−1 (8.10 g·s−1), 0.61 kJ·kg−1 (10.10 g·s−1) and 0.46 kJ·kg−1 (12.10 g·s−1), and 0.57 kJ·kg−1 (8.10 g·s−1), 0.48 kJ·kg−1 (10.10 g·s−1), and 0.79 kJ·kg−1 (12.10 g·s−1). The proposed model exhibited good fitting with the validation data.
{"title":"Exergy Analysis of a Passive Thermal System Using Hammerstein-Wiener Estimation","authors":"A. Dhaundiyal","doi":"10.1115/1.4062686","DOIUrl":"https://doi.org/10.1115/1.4062686","url":null,"abstract":"\u0000 A non-linear system identification approach was used to exploit the nonlinearly in the exergy of the system and reduce it into two or more interconnected elements. The Hammerstein-Wiener (H-W) methodology was adopted to describe the dynamics of a passive thermal system using a combination of nonlinear and linear blocks. Here, the linear block is a discrete transfer function which symbolizes the dynamic component of the model. The combination of Single Input Single Output (SISO) and Multiple Input Single Output (MISO) was adopted to develop the exergy model. The proposed model was validated using the state properties measured for the passive solar thermal system collector. The mean absolute percentage error (MAPE) for enthalpy changes falls in the domain of −0.01% to 0.01%, whereas it varied from −0.06% to 0.02% as the entropy of the system changed with time. Similarly, the MAPE encountered while evaluating the exergy of the system, was in the closed interval of −0.066% to −0.0017%. The average exergy gain by the H-W model across the Ist and IInd passages was, respectively, 0.90 kJ·kg−1 (8.10 g·s−1), 0.61 kJ·kg−1 (10.10 g·s−1) and 0.46 kJ·kg−1 (12.10 g·s−1), and 0.57 kJ·kg−1 (8.10 g·s−1), 0.48 kJ·kg−1 (10.10 g·s−1), and 0.79 kJ·kg−1 (12.10 g·s−1). The proposed model exhibited good fitting with the validation data.","PeriodicalId":15676,"journal":{"name":"Journal of Energy Resources Technology-transactions of The Asme","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44966178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Dimethyl ether is a new-generation alternative fuel to mitigate cold-start issues in compression ignition engines. It has a higher cetane number and can efficiently lead to superior atomization and evaporation characteristics. This computational study compares Dimethyl ether and baseline diesel sprays in a constant-volume spray chamber. This simulation study compares spray and evaporation characteristics en-hancement due to Dimethyl ether adaptation. Fuel properties greatly influence spray atomization and evaporation characteristics. This study is based on the Eu-lerian-Lagrangian approach adopted in the Reynolds-averaged Navier-Stokes framework. The liquid spray penetration obtained by simulations matched well with the experimental results of Dimethyl ether and baseline diesel. Spray model con-stants were tuned for diesel and Dimethyl ether separately, as the fuel properties of both test fuels are completely different. These tuned models were used to simulate Dimethyl ether and diesel sprays at fixed fuel injection timings and ambient condi-tions. Results showed a lower spray penetration length for Dimethyl ether than die-sel because of the flash boiling of Dimethyl ether. Smaller diameter droplets formed due to Dimethyl ether's lower viscosity, density, surface tension, and higher evapora-tion rate. The reduction in Sauter mean diameter was quite sharp after the start of injection for the Dimethyl ether. Diesel spray showed retarded atomization and evaporation compared to Dimethyl ether. The vapour penetration length of both fuels was almost the same; however, the vapor mass fraction was higher for Dime-thyl ether than baseline diesel. Dimethyl ether spray showed superior spray atomi-zation and improved evaporation of Dimethyl ether droplets.
{"title":"Comparative Spray Atomization and Evaporation Characteristics of Dimethyl Ether and Mineral Diesel","authors":"Utkarsha Sonawane, A. Agarwal","doi":"10.1115/1.4062619","DOIUrl":"https://doi.org/10.1115/1.4062619","url":null,"abstract":"\u0000 Dimethyl ether is a new-generation alternative fuel to mitigate cold-start issues in compression ignition engines. It has a higher cetane number and can efficiently lead to superior atomization and evaporation characteristics. This computational study compares Dimethyl ether and baseline diesel sprays in a constant-volume spray chamber. This simulation study compares spray and evaporation characteristics en-hancement due to Dimethyl ether adaptation. Fuel properties greatly influence spray atomization and evaporation characteristics. This study is based on the Eu-lerian-Lagrangian approach adopted in the Reynolds-averaged Navier-Stokes framework. The liquid spray penetration obtained by simulations matched well with the experimental results of Dimethyl ether and baseline diesel. Spray model con-stants were tuned for diesel and Dimethyl ether separately, as the fuel properties of both test fuels are completely different. These tuned models were used to simulate Dimethyl ether and diesel sprays at fixed fuel injection timings and ambient condi-tions. Results showed a lower spray penetration length for Dimethyl ether than die-sel because of the flash boiling of Dimethyl ether. Smaller diameter droplets formed due to Dimethyl ether's lower viscosity, density, surface tension, and higher evapora-tion rate. The reduction in Sauter mean diameter was quite sharp after the start of injection for the Dimethyl ether. Diesel spray showed retarded atomization and evaporation compared to Dimethyl ether. The vapour penetration length of both fuels was almost the same; however, the vapor mass fraction was higher for Dime-thyl ether than baseline diesel. Dimethyl ether spray showed superior spray atomi-zation and improved evaporation of Dimethyl ether droplets.","PeriodicalId":15676,"journal":{"name":"Journal of Energy Resources Technology-transactions of The Asme","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2023-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48674197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Based on industrial CT, the whole core sandy conglomerate is scanned with a resolution of 0.5 mm/voxel, and the representative debris region and filling region subsample is selected to be scanned with a resolution of 15 µm/voxel using micro-CT. Then, four regions of the whole core sandy conglomerate image are segmented with the multi-threshold segmentation algorithm including macro-pore, debris, filling and gravel regions, while binary segmentation is performed on the debris and filling subsamples to segment the debris pores and filling pores respectively. Finally, the multi-scale and multi-region pore network model of the sandy conglomerate was constructed by the integration method to analyze the different types of pore characteristics. It can be found that, the integrated sandy conglomerate model can reflect the structural characteristics of macro-pore, debris pore and filling pore at the same time. Meanwhile, the porosity/permeability of integrated sandy conglomerate model are calculated and is basically consistent with the that of lab test results, which greatly increases the accuracy of the multi-scale multi-region pore network model.
{"title":"Multi-scale and multi-region pore structure analysis on sandy conglomerate whole core with digital rock model","authors":"Chenchen Wang, H Zhao, Guanglong Sheng, Jingwei Huang, Qi Zhang, Yuhui Zhou","doi":"10.1115/1.4062525","DOIUrl":"https://doi.org/10.1115/1.4062525","url":null,"abstract":"\u0000 Based on industrial CT, the whole core sandy conglomerate is scanned with a resolution of 0.5 mm/voxel, and the representative debris region and filling region subsample is selected to be scanned with a resolution of 15 µm/voxel using micro-CT. Then, four regions of the whole core sandy conglomerate image are segmented with the multi-threshold segmentation algorithm including macro-pore, debris, filling and gravel regions, while binary segmentation is performed on the debris and filling subsamples to segment the debris pores and filling pores respectively. Finally, the multi-scale and multi-region pore network model of the sandy conglomerate was constructed by the integration method to analyze the different types of pore characteristics. It can be found that, the integrated sandy conglomerate model can reflect the structural characteristics of macro-pore, debris pore and filling pore at the same time. Meanwhile, the porosity/permeability of integrated sandy conglomerate model are calculated and is basically consistent with the that of lab test results, which greatly increases the accuracy of the multi-scale multi-region pore network model.","PeriodicalId":15676,"journal":{"name":"Journal of Energy Resources Technology-transactions of The Asme","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47647139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Praveenkumar Thaloor Ramesh, Badrinarayan Rath, S. Devanesan, Mohamad S. Alsahi, G. Jhanani, H. F. Gemede, Gaweł Sołowski, Freedon Daniel
Extensive efforts are being made to produce and use variety of alternative energies in order to meet the rising global energy demand. The main purpose of this research was to evaluate the mass fuel burnt, emissions, and performance properties of biodiesel made from non-edible Karanja oil along with hydrogen and nanoparticles in a standard diesel engine. Upon experimental evaluation, it was determined that the transesterified Karanja oil retained all of its vital physicochemical properties within the specified tolerances. The emission and performance characteristics of karanja biodiesel blended with nanoparticles and hydrogen fuel were assessed at different engine load ranging from 0% to 100%. The uniform amount of nanoparticles and hydrogen was incorporated in test fuels. Al2O3 nanoparticles of 50ppm were used in this study and hydrogen of 5L/min was supplied to the engine. K20NH test fuel had the maximum brake thermal efficiency and less BSFC compared to the other fuel blend. The emissions were considerably reduced on karanja oil, nanoparticles and hydrogen blended biodiesel except nitrogen emission compared with conventional diesel fuel. In this study, utilization of karanja, nanoparticles and hydrogen blended biodiesel showed a promising alternative for fossil fuels due to reduced emission and enhanced performance characteristics.
{"title":"Performance and emission characteristics for karanja biodiesel blends assisted with green hydrogen fuel and nanoparticles","authors":"Praveenkumar Thaloor Ramesh, Badrinarayan Rath, S. Devanesan, Mohamad S. Alsahi, G. Jhanani, H. F. Gemede, Gaweł Sołowski, Freedon Daniel","doi":"10.1115/1.4062526","DOIUrl":"https://doi.org/10.1115/1.4062526","url":null,"abstract":"\u0000 Extensive efforts are being made to produce and use variety of alternative energies in order to meet the rising global energy demand. The main purpose of this research was to evaluate the mass fuel burnt, emissions, and performance properties of biodiesel made from non-edible Karanja oil along with hydrogen and nanoparticles in a standard diesel engine. Upon experimental evaluation, it was determined that the transesterified Karanja oil retained all of its vital physicochemical properties within the specified tolerances. The emission and performance characteristics of karanja biodiesel blended with nanoparticles and hydrogen fuel were assessed at different engine load ranging from 0% to 100%. The uniform amount of nanoparticles and hydrogen was incorporated in test fuels. Al2O3 nanoparticles of 50ppm were used in this study and hydrogen of 5L/min was supplied to the engine. K20NH test fuel had the maximum brake thermal efficiency and less BSFC compared to the other fuel blend. The emissions were considerably reduced on karanja oil, nanoparticles and hydrogen blended biodiesel except nitrogen emission compared with conventional diesel fuel. In this study, utilization of karanja, nanoparticles and hydrogen blended biodiesel showed a promising alternative for fossil fuels due to reduced emission and enhanced performance characteristics.","PeriodicalId":15676,"journal":{"name":"Journal of Energy Resources Technology-transactions of The Asme","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47182983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
George-Rafael Domenikos, Emmanouil Rogdakis, I. Koronaki
The aim of this work is to analyze a Superfluid Stirling Cryocooler using Superfluid Helium as the working medium. The idea behind this kind of cryocooler is to utilize two conjoined Stirling coolers with a phase difference as to achieve heat transfer between them and thus negate the need for a regenerator. The two cycles exchange heat at an exchanger, referred to as a recuperator, placed where the regenerator would be typically. This apparatus is simulated through an one dimensional model where the full equations of state for the superfluid are being used, opposed to the common simplifications when modelling superfluids. This model provides the expected results for the initial case of 180-deg phase difference between the engines, and then finds the optimal phase difference for the best coefficient of performance. A 3D model is designed in the ANSYS Fluent software, and the Superfluid data are used in the CFD calculation. Running different cases, the optimal phase difference for the 3D case was found and compared to the 1D model. Additionally, the cryocooler was simulated to work in different frequencies for finding its optimal speed and derive the cooling power to frequency plot.
{"title":"Computational Analysis, 3D Simulation and Optimization of Superfluid Stirling Cryocooler","authors":"George-Rafael Domenikos, Emmanouil Rogdakis, I. Koronaki","doi":"10.1115/1.4062527","DOIUrl":"https://doi.org/10.1115/1.4062527","url":null,"abstract":"\u0000 The aim of this work is to analyze a Superfluid Stirling Cryocooler using Superfluid Helium as the working medium. The idea behind this kind of cryocooler is to utilize two conjoined Stirling coolers with a phase difference as to achieve heat transfer between them and thus negate the need for a regenerator. The two cycles exchange heat at an exchanger, referred to as a recuperator, placed where the regenerator would be typically. This apparatus is simulated through an one dimensional model where the full equations of state for the superfluid are being used, opposed to the common simplifications when modelling superfluids. This model provides the expected results for the initial case of 180-deg phase difference between the engines, and then finds the optimal phase difference for the best coefficient of performance. A 3D model is designed in the ANSYS Fluent software, and the Superfluid data are used in the CFD calculation. Running different cases, the optimal phase difference for the 3D case was found and compared to the 1D model. Additionally, the cryocooler was simulated to work in different frequencies for finding its optimal speed and derive the cooling power to frequency plot.","PeriodicalId":15676,"journal":{"name":"Journal of Energy Resources Technology-transactions of The Asme","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45713058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Allam cycle is known as oxy-fuel gas-powerd power cycle. A modified Allam cycle co-fired by biomass and natural gas is proposed in this paper, evaluated and optimized. Detailed thermodynamic, economic, and exergoeconomic analyses are reported for the co-fired cycle. And parametric analysis and a tri-optimization are carried out to investigate the effects of cycle variables on the system performance. The results show that as co-firing ratio increases from 20% to 100%, the exergetic efficiency and the levelized cost of electricity vary from 44.3% to 36.8% and 123.2 /MWh to 164.4/MWh, respectively, while the specific negative CO2 emission increases from 44.5 kg/MWh to 251 kg/MWh. The results of tri-objective optimization reveal that the highest exergetic efficiency of 46.85%, lowest levelized cost of electricity of 99.57 $/MWh, and highest specific negative CO2 emission of 323.6 kg/MWh are obtained respectively at different optimal operation conditions.
{"title":"Exergoeconomic analysis and tri-objective optimization of the Allam cycle co-fired by biomass and natural gas","authors":"Wen Chan, T. Morosuk, Xi Li, Huixiong Li","doi":"10.1115/1.4062528","DOIUrl":"https://doi.org/10.1115/1.4062528","url":null,"abstract":"\u0000 Allam cycle is known as oxy-fuel gas-powerd power cycle. A modified Allam cycle co-fired by biomass and natural gas is proposed in this paper, evaluated and optimized. Detailed thermodynamic, economic, and exergoeconomic analyses are reported for the co-fired cycle. And parametric analysis and a tri-optimization are carried out to investigate the effects of cycle variables on the system performance. The results show that as co-firing ratio increases from 20% to 100%, the exergetic efficiency and the levelized cost of electricity vary from 44.3% to 36.8% and 123.2 /MWh to 164.4/MWh, respectively, while the specific negative CO2 emission increases from 44.5 kg/MWh to 251 kg/MWh. The results of tri-objective optimization reveal that the highest exergetic efficiency of 46.85%, lowest levelized cost of electricity of 99.57 $/MWh, and highest specific negative CO2 emission of 323.6 kg/MWh are obtained respectively at different optimal operation conditions.","PeriodicalId":15676,"journal":{"name":"Journal of Energy Resources Technology-transactions of The Asme","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42767662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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