Article
Engineering, Marine
Ravi Patel, Vimal Patel
Summary: The blade profile of the Savonius hydrokinetic turbine significantly affects the rotor's performance. Previous research suggested different blade profiles. In this study, a recommended blade profile was chosen, and two different configurations were tested: sharp edge outside and sharp edge inside. The results were compared to a conventional rotor. The study found that a sharp edge outside performs better than a sharp edge inside and the traditional rotor. The best configuration was further tested for different wave amplitudes, resulting in a 31% improvement in power coefficient compared to a previously proposed design and a 37% improvement compared to the conventional design.
Article
Engineering, Marine
Khaled R. Abdelaziz, Mohamed A. A. Nawar, Ahamed Ramadan, Youssef A. Attai, Mohamed H. Mohamed
Summary: This study investigates the performance of a conventional Savonius turbine and a modified configuration by varying the blade arc angles and gap ratio. The numerical simulation using ANSYS-Fluent software package reveals that adjusting the blade arc angles can enhance the maximum power coefficient, while the modified Savonius rotor with a specific gap ratio and an outer blade angle shows a significant increase in the maximum power coefficient compared to the conventional profile.
Article
Thermodynamics
Khaled R. Abdelaziz, Mohamed A. A. Nawar, Ahmed Ramadan, Youssef A. Attai, Mohamed H. Mohamed
Summary: This research investigates the performance of two novel Savonius rotor profiles, the sine and conical profiles. A 3-D numerical simulation of a Savonius turbine is conducted using ANSYS Fluent software, and the flow characteristics are solved using the URANS equations and SST k-omega turbulence model. The conventional Savonius rotor is validated by comparing the results with previous numerical and experimental data. The sine profile reduces the maximum power coefficient by 1.25% compared to the conventional profile, while the conical rotor enhances the maximum power coefficient by 8.6% compared to the conventional profile.
Article
Green & Sustainable Science & Technology
Luis A. Gallo, Edwin L. Chica, Elkin G. Florez
Summary: The present study used numerical methods to determine the optimal geometric proportions of a split Bach blade Savonius rotor. Experimental designs and computational simulations were used to analyze the effects of different geometric factors on performance. The results showed that optimizing the geometry led to a significant increase in performance compared to the conventional semicircular rotor.
Article
Engineering, Marine
Ali Hesami, Amir H. Nikseresht, Mohamed H. Mohamed
Summary: This study investigates the performance improvement of Savonius wind turbines using a wind-lens. The results show that the proposed system can significantly enhance the power generation efficiency, providing valuable insights for further development of more efficient wind power systems.
Article
Engineering, Marine
Islam Abdelghafar, Emeel Kerikous, Stefan Hoerner, Dominique Thevenin
Summary: Wind turbines are a possible solution for harnessing the kinetic energy in wind and converting it to useful energy. In this study, a bionic blade design inspired by sandeels is proposed to optimize the performance of the Savonius rotor. Experimental results show a significant increase in turbine efficiency compared to conventional designs.
Article
Engineering, Multidisciplinary
Mohamed R. Shouman, Mohamed M. Helal, Ahmed A. El-Haroun
Summary: This paper introduces a new modification of Savonius wind rotors to improve their performance by adding a curtain arrangement and fins on the blades. The effect of the proposed modification was predicted using CFD simulation and compared with conventional rotors.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Mechanics
Hossein Fatahian, Zulfaa Mohamed-Kassim, Wei Shyang Chang
Summary: This study proposes a novel solution to improve the performance of Savonius turbines by dynamically venting out the returning blades using controllable flaps. The results show significant improvements in power and torque coefficients.
Article
Energy & Fuels
Jan Michna, Krzysztof Rogowski
Summary: The conventional two-bladed Savonius rotor geometry mentioned in a literature report was used in this study. A two-dimensional rotor model consisting of two buckets with an overlap ratio of 0.1 was created. The unsteady Reynolds averaged Navier-Stokes equations and SST k-omega turbulent model were applied for numerical solution of the fluid motion equations. Instantaneous velocities and pressures were calculated at defined points around the rotor and then averaged. The research findings demonstrate that the operating rotor significantly alters the flow on the downwind part and in the wake, while the tip speed ratio has less impact on average velocity distribution. However, it has a greater influence on aerodynamic moment characteristics and static pressure distribution in the wake. The average velocity parallel to the undisturbed flow direction in the upwind part of the rotor is 29% lower than in the downwind part.
Article
Energy & Fuels
Krzysztof Doerffer, Janusz Telega, Piotr Doerffer, Paulina Hercel, Andrzej Tomporowski
Summary: To reduce production costs, a simple construction with single-segment Savonius rotors is proposed, compared to multi-segment rotors, which may be more effective at low wind speeds but similar at high wind speeds.
Article
Engineering, Civil
Mohammad Asadi, Rahim Hassanzadeh
Summary: This study investigates the impact of internal rotor type on the power characteristics of a two-bladed hybrid vertical axis wind turbine. Results show that the Bach-type Savonius rotor performs better under various conditions.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2022)
Article
Chemistry, Multidisciplinary
Luis A. Gallo, Edwin L. Chica, Elkin G. Florez, Felipe A. Obando
Summary: The present study evaluated the implementation of multi-blade profiles in a Savonius rotor to increase pressure in the blade's intrados and decrease motion resistance. The optimized geometry resulted in a 10.8% increase in performance compared to the profile without secondary elements and a 51.2% increase compared to the conventional semicircular profile. The numerical results showed good fit with experimental data obtained using a wind tunnel.
APPLIED SCIENCES-BASEL
(2021)
Article
Energy & Fuels
Heejeon Im, Bumsuk Kim
Summary: Savonius vertical axis wind turbines have simple structures, can self-start in environments with low wind speed and strong turbulence intensity, and can be installed at low costs. In this study, the design variables and blade forms of Savonius wind turbines were examined using computational fluid dynamics analysis, and a stable wind turbine capable of providing the target output was designed with a maximum rotor efficiency of 18%.
Article
Thermodynamics
Zaiyu Gu, Guojiang Xiong, Xiaofan Fu, Ali Wagdy Mohamed, Mohammed Azmi Al-Betar, Hao Chen, Jun Chen
Summary: Photovoltaic power generation is crucial for environmental protection and requires accurate modeling and parameter extraction. The proposed ELADE algorithm combines multiple strategies to improve the performance of differential evolution in achieving accurate parameters for photovoltaic cell models. Experimental results show that a population size of 50 produces the most reliable parameters compared to other algorithms. Statistical tests confirm the superiority of ELADE, with the parameters adaptive strategy being the most influential.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Energy & Fuels
Kumail Abdulkareem Hadi Al-Gburi, Balasem Abdulameer Jabbar Al-quraishi, Firas Basim Ismail Alnaimi, Ee Sann Tan, Ali Hussein Shamman Al-Safi
Summary: This study evaluates the performance of a scaled-down Savonius turbine in terms of power output using a wind tunnel. Various modified configurations and their effects on torque and power coefficients are discussed. The findings show significant improvements in the new models under identical wind speed conditions.
Article
Energy & Fuels
Sunirmit Verma, Sanjib Banerjee, Ranjan Das
Summary: The use of sinusoidal functions allows for the derivation of closed form solutions for the temperature of the cooking fluid and storage medium in a box-type solar cooker. The study investigates the effects of storage medium mass and cooking vessel area on the system's performance, and provides guidelines for the design of solar cookers with thermal storage.
Article
Thermodynamics
Sunirmit Verma, Ranjan Das
Summary: The effect of bottom surface thermal energy loss on a packed bed solar air heater is investigated using both numerical and analytical models. The study shows that the insulation thickness of the base has a significant impact on the system's output. A collector with no insulation on the base loses a large portion of the incident solar energy, while a thicker insulation reduces the loss fraction. The efficiency of the insulation decreases with larger collector size but increases with a higher mass flow rate of air. This research provides a mathematical tool to calculate the appropriate insulation thermal resistance for packed bed solar air heaters, optimizing thermal performance and minimizing insulation cost.
JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS
(2022)
Article
Energy & Fuels
Ankit Varshney, Niraj Kumar Mishra, Ranjan Das
Summary: This paper presents a study on a novel electrostatic precipitator for capturing submicron particles emitted from biomass burning. Numerical simulation and experimental research show that the semi-circular corrugated plate ESP has a higher collection efficiency compared to the flat plate ESP, and can effectively suppress vortex formation and enhance particle collection efficiency.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Energy & Fuels
Sunirmit Verma, Ranjan Das
Summary: This paper examines the thermal energy loss of a cylindrical solar pond using one-dimensional and two-dimensional transient models. The study shows that as the size of the pond increases, the negative impact of sidewall loss decreases. The two-dimensional model provides a more realistic calculation of entropy generation for imperfectly insulated ponds. Although using a simplified one-dimensional model to estimate insulation thickness does not cause thermal performance issues, it may increase costs.
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
(2022)
Article
Energy & Fuels
Gaurav Singh, Ranjan Das
Summary: This study proposes a novel VRF strategy that integrates solar energy and desiccant-assisted DOAS to improve indoor air quality. Energyplus simulations show that the system achieves significant energy savings across different climatic conditions.
Article
Environmental Sciences
Sunirmit Verma, Ranjan Das
Summary: This study revisits the performance of a solitary basin solar still aided by external heat addition. An expression for the maximum possible effectiveness of the exchanger is derived, and improved closed form solutions for the still water temperature and still productivity are obtained. The results show that the present analytical solutions are superior to other iterative solutions in the literature, and suggest an optimum water thickness for maximizing system productivity.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Energy & Fuels
Gaurav Singh, Ranjan Das
Summary: Air conditioning in composite weather presents challenges and importance resembling various climate conditions. The separation of cooling and ventilation tasks through a dedicated outdoor air system (DOAS) is an attractive technique for designing energy-efficient air-conditioning systems. This study analyzes the electrical energy consumption of a building's air-conditioning unit when modifications are made to the desiccant-integrated DOAS's air pathway. Simulation results demonstrate that using a heat wheel instead of an indirect evaporation cooler (IEC) can save approximately 2994 kWh of thermal energy with a 5.04% reduction in electrical energy consumption. The suggested design also provides a higher solar fraction.
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
(2023)
Article
Energy & Fuels
Alok Ranjan, Ranjan Das, Sameer S. Gajghate, Debabrata Barik, Himadri Majumder, Elaine M. Cardoso, Arindam Majumder, Sagnik Pal, Madhujit Deb
Summary: This paper numerically investigates split hemispherical fins mounted staggered over a base plate. The results show that compared to cylindrical fins, hemispherical fins have higher Nu values and ΔP values. The HTPF values of hemispherical fins are greater than unity for all considered Reynolds numbers. Additionally, the hemispherical fins are split into longitudinal and transverse flow directions for better solid-fluid interaction. Finally, the optimum Nu value is obtained using the cuckoo search algorithm and response surface method, with a promising result and a small error.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Thermodynamics
Sandipan Deb, Mantu Das, Dipak Chandra Das, Sagnik Pal, Ranjan Das, Ajoy Kumar Das
Summary: Experimental investigations were conducted to analyze the evaporation heat transfer of R407c inside a horizontal microfin Cu-tube. The results showed that heat transfer coefficients increase with mass flux, vapor quality, saturation temperature, hydraulic diameter, and heat flux. Additionally, correlations of evaporation heat transfer were established using the interpolation technique in LINGO software.
HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Sandipan Deb, Kanade Paresh Mahesh, Mantu Das, Dipak Chandra Das, Sagnik Pal, Ranjan Das, Ajoy Kumar Das
Summary: The flow boiling heat transfer performance of horizontal smooth and microfin tubes using the refrigerant R407c was investigated. Experimental results showed that the heat transfer rate of the microfin tube is superior to the smooth tube, with a heat transfer enhancement percentage of 28-280%. Additionally, the pressure drop in the microfin tube was increased by 68-110% compared to the smooth tube. A sensitivity analysis was also carried out for flow boiling heat transfer phenomenon via the smooth tube.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Engineering, Mechanical
Ajithram Arivendan, Winowlin Jappes Jebas Thangiah, Ranjan Das, Desai Ahamad, Gandhapodi Kothandaraman Chithra
Summary: Water hyacinth is a common free-floating aquatic plant with fast growth and extensive spread. The government has invested a significant amount of money to remove it as it is considered waste. This paper discusses the effective use of water hyacinth in wastewater treatment, converting it into fiber and producing a composite material. Tests have shown that the water hyacinth fiber reinforced composite has high tensile strength, flexural strength, and impact strength. The results suggest that water hyacinth can be better utilized in the production of commercial household applications and lightweight materials.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2023)
Article
Engineering, Mechanical
Alok Ranjan, Ranjan Das, Sagnik Pal, Arindam Majumder, Madhujit Deb
Summary: This paper investigates the thermal and fluid flow behavior of porous and non-porous fins. The study includes analysis and validation of solid heat sink with circular fins, as well as making circular tapered porous fin of the same volume and height as the uniform circular fin. The study considers various geometrical parameters and evaluates the value of Nusselt number, friction factor, and thermal performance factor. The optimized combination is obtained through cuckoo search optimization using the response surface method.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2023)
Article
Energy & Fuels
Sunirmit Verma, Chetan Aggarwal, Ranjan Das
Summary: In this study, a waste heat exchanger with a thick separating wall is proposed to store waste heat energy and use it when waste heat is not available. The effects of various user-controlled parameters on the system performance have been investigated. It is observed that increasing the exchanger length, width, thicknesses of the separating wall and cold fluid flow passage reduce the outlet cold fluid temperature during the time waste heat is available, while the opposite effect is exhibited when waste heat is unavailable.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Enderaaj Singh, Sukanta Roy, Ke San Yam, Ming Chiat Law
Summary: This paper presents a numerical study on the power production efficiency of a three-bladed H-Darrieus vertical axis wind turbine using S-1046 airfoil under accelerated wind conditions of the cooling tower exhaust system. The results show that the turbine with a smaller aspect ratio of 0.44 achieves a better power coefficient of 0.294 at TSR 2.5. Flow field analysis and a comparative study with free-stream flow conditions are provided to discuss the turbine's performance, indicating that the turbine performs better under exhaust flow systems.
Article
Energy & Fuels
Alok Ranjan, Ranjan Das, Debabrata Barik, Sagnik Pal, Arindam Majumder, Madhujit Deb, Milon Selvam Dennison
Summary: Researchers are investigating the infusion of various fin geometry over the heated plate to enhance the heat transfer phenomenon. The study numerically analyzes the fluid flow pattern and thermodynamic analysis of porous-based split elliptical fins mounted staggered over a heated base plate, with Reynolds numbers ranging from 783 to 1839.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Thermodynamics
Pengcheng Zhao, Jingang Wang, Liming Sun, Yun Li, Haiting Xia, Wei He
Summary: The production of green hydrogen through water electrolysis is crucial for renewable energy utilization and decarbonization. This research explores the optimal electrode configuration and system design of compactly-assembled industrial electrolyzer. The findings provide valuable insights for industrial application of water electrolysis equipment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
V. Baiju, P. Abhishek, S. Harikrishnan
Summary: Thermally driven adsorption desalination systems (ADS) have gained attention as an eco-friendly solution for water scarcity. However, they face challenges related to low water productivity and scalability. To overcome these challenges, integrating ADS with other desalination technologies can create a small-scale hybrid system. This study proposes integrating ADS with a Thermo Electric Dehumidification (TED) unit to enhance its performance.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
C. X. He, Y. H. Liu, X. Y. Huang, S. B. Wan, Q. Chen, J. Sun, T. S. Zhao
Summary: A decentralized centroid multi-path RC network model is constructed to improve the temperature prediction accuracy compared to traditional RC models. By incorporating multiple heat flow paths and decentralizing thermal capacity, a more accurate prediction is achieved.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chaoying Li, Meng Wang, Nana Li, Di Gu, Chao Yan, Dandan Yuan, Hong Jiang, Baohui Wang, Xirui Wang
Summary: There is an urgent need to shift away from heavy dependence on fossil fuels and embrace renewable energy sources, particularly in the energy-intensive oil refining process. This study presents an innovative concept called the Solar Oil Refinery, which applies solar energy in oil refining. A solar multi-energies-driven hybrid chemical oil refining system that utilizes solar pyrolysis and electrolysis has been developed, significantly improving solar utilization efficiency, cracking rate, and hydrogen yield.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chao Ma, Guanghui Wang, Dingbiao Wang, Xu Peng, Yushen Yang, Xinxin Liu, Chongrui Yang, Jiaheng Chen
Summary: This study proposes a bio-inspired fish-tail wind rotor to improve the wind power efficiency of the traditional Savonius rotor. Through transient simulations and orthogonal experiments, the key factors affecting the performance are identified. A response surface model is constructed to optimize the power coefficient, resulting in an improvement of 9.4% and 6.6% compared to the Savonius rotor.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sina Bahmanziari, Abbas-Ali Zamani
Summary: This paper proposes a new framework for improving electrical energy harvesting from piezoelectric smart tiles through a combination of magnetic plucking, mechanical impact, and mechanical vibration force mechanisms. Experimental results demonstrate a significant increase in energy yield and average energy harvesting time compared to other mechanisms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Nanjiang Dong, Tao Zhang, Rui Wang
Summary: This study establishes a multiobjective mixed-variable configuration optimization model for a comprehensive combined cooling, heating, and power energy system, and proposes an efficient generating operator to optimize this model. The experimental results show that the proposed algorithm performs better than other state-of-the-art algorithms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Ahmed E. Mansy, Eman A. El Desouky, Tarek H. Taha, M. A. Abu-Saied, Hamada El-Gendi, Ranya A. Amer, Zhen-Yu Tian
Summary: This study aims to convert office paper waste into bioethanol through a sustainable pathway. The results show that physiochemical and enzymatic hydrolysis of the waste can yield a high glucose concentration. The optimal conditions were determined using the Box-Behnken design, and a blended membrane was used for ethanol purification.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sven Klute, Marcus Budt, Mathias van Beek, Christian Doetsch
Summary: Heat pumps are crucial for decarbonizing heat supply, and steam generating heat pumps have the potential to decarbonize the industrial sector. This paper presents the current state, technical and economic data, and modeling principles of steam generating heat pumps.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Le Zhang, To-Hung Tsui, Yen Wah Tong, Pruk Aggarangsi, Ronghou Liu
Summary: This study investigates the effectiveness of a current-carrying-coil-based magnetic field in promoting anaerobic digestion of chicken manure. The results show that the applied magnetic field increases methane yield, decreases carbon dioxide production, and reduces the concentration of ammonia nitrogen. Microbial community analysis reveals the enrichment of certain methanogenic genera and enhanced metabolic pathways. Pilot-scale experiments confirm the technical effectiveness of the magnetic field assistance in enhancing anaerobic digestion of chicken manure.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Bo Chen, Ruiqing Ma, Yang Zhou, Rui Ma, Wentao Jiang, Fan Yang
Summary: This paper presents an advanced energy management strategy for fuel cell hybrid electric heavy-duty vehicles, focusing on speed planning and energy allocation. By utilizing predictive co-optimization control, this strategy ensures safe inter-vehicle distance and minimizes energy demand. Simulation results demonstrate the effectiveness of the proposed method in reducing fuel cell degradation cost and overall operation cost.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Fabio Fatigati, Roberto Cipollone
Summary: Organic Rankine Cycle-based microcogeneration systems that use solar sources to generate electricity and hot water can help reduce CO2 emissions in residential energy-intensive sectors. The adoption of a recuperative heat exchanger in these systems improves efficiency, reduces thermal power requirements, and saves on electricity costs.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Lipeng He, Renwen Liu, Xuejin Liu, Xiaotian Zheng, Limin Zhang, Jieqiong Lin
Summary: This research proposes a piezoelectric-electromagnetic hybrid energy harvester (PEHEH) for low-frequency wave motion and self-sensing wave environment monitoring. The PEHEH shows promising power output and the ability to self-power and self-sense the wave environment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Shangling Chu, Yang Liu, Zipeng Xu, Heng Zhang, Haiping Chen, Dan Gao
Summary: This paper studies a distributed energy system integrated with solar and natural gas, analyzes the impact of different parameters on its energy utilization and emissions reduction, and obtains the optimal solution through an optimization algorithm. The results show that compared to traditional separation production systems, this integrated system achieves higher energy utilization and greater reduction in carbon emissions.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Qingpu Li, Yaqi Ding, Guangming Chen, Yongmei Xuan, Neng Gao, Nian Li, Xinyue Hao
Summary: This paper proposes and studies a piston-type thermally-driven pump with a structure similar to a linear compressor, aiming to eliminate the high-quality energy consumption of existing pumps and replace mechanical pumps. The coupling mechanism of working fluid flow and element dimension is analyzed based on force analysis, and experimental data analysis is used to determine the pump operation stroke. Theoretical simulation is conducted to analyze the correlation mechanism of the piston assembly. The research shows that the thermally-driven pump can greatly reduce power consumption and has potential for industrial applications.
ENERGY CONVERSION AND MANAGEMENT
(2024)