Article
Energy & Fuels
Hind Krabch, Rachid Tadili, Ahmed Idrissi, Mohammed Bargach
Summary: This study presents the experimental results of an indirect solar dryer with a single compartment. The unique design of the dryer enhances heat transfer and drying efficiency, resulting in decreased relative humidity and faster drying time for agricultural products. The cost-effective nature of this dryer makes it an attractive option for local producers.
Article
Green & Sustainable Science & Technology
Mehmet Das, Ebru Kavak Akpinar
Summary: The study aimed to increase the thermal efficiency of the solar air collector (SAC) by adding a two-direction solar tracking feature, supported by PLC. Results showed that the SACD with solar tracking feature had significantly higher thermal and drying efficiency compared to the one without this feature.
Article
Food Science & Technology
Huanyu Kang, Guochen Zhang, Gang Mu, Cheng Zhao, Haolin Huang, Chengxiang Kang, Xiuchen Li, Qian Zhang
Summary: This study proposes a novel greenhouse double-evaporator solar-assisted heat pump drying system, which was proven to be highly efficient and energy-saving for macroalgae and other aquatic products drying.
Article
Thermodynamics
Pimpan Pruengam, Siwalak Pathaveerat, Prasertsak Pukdeewong
Summary: A double-sided solar collector dryer was designed and tested, showing a higher efficiency than natural sun drying and a faster drying rate for bananas. The thermal efficiency of the solar collector was significantly better than that of the dryer.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Alok Dhaundiyal, Gedion H. Gebremichael, Divine Atsu
Summary: This study critically examines a solar dryer using a constant drying model to evaluate various factors affecting its performance. The authors investigated dynamic losses, intrinsic properties, and the effect of natural draft during practical application. They used various correlations and calculations to determine the flow pattern, energy allocation, and psychrometric properties. The study provides insights into the efficiency and design requirements of solar dryers.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2023)
Article
Thermodynamics
Yan Jiang, Huan Zhang, Yeming Wang, Yaran Wang, Minzhang Liu, Shijun You, Zhangxiang Wu, Man Fan, Shen Wei
Summary: A novel solar-assisted air source heat pump system for rural residence heating was proposed and three working modes were studied. Mathematical models and boundary equations were established to analyze the system performance under different factors. Results showed that the system can effectively utilize solar energy and improve performance by 64.4% compared to traditional systems.
Article
Thermodynamics
Yan Jiang, Jiaxuan Pu, Huan Zhang, Sujie Liu, Yaran Wang, Shijun You, Zhihao Wan, Zhangxiang Wu, Xianwang Fan, Zhikai Liu, Shen Wei
Summary: This paper investigates the use of a triangular solar air collector to restrain frost formation on the evaporator surface of an air source heat pump. A dynamic heat transfer model and quasi-steady-state frosting model were established and coupled, taking into account the effect of frost layer thickness variation on evaporator airflow. The results demonstrate that the triangular solar air collector effectively reduces frost thickness by more than 15% and increases the total heat flux by 101.4 W/m2 under frosting conditions, leading to a 36.6% increase in heat exchange of the evaporator during a typical day.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Jianchun Yan, Hai Wei, Zhaoyan You, Huichang Wu, Jiayu Zhang, Kunjie Chen, Huanxiong Xie
Summary: A box-type hot-air convection dryer with various features was designed and used, and its performance was evaluated through measurements and analysis. The results showed uniform airflow distributions, good temperature control, and efficient dehydration rates. The moisture content of the materials decreased slowly in the early stage of drying, but accelerated in the later stage. The dried products had high moisture uniformity and no issues of mildewing or inadequate drying, indicating the technique's suitability for drying fruits and vegetables.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Jin Yu, Jianlin Yu
Summary: Heat pumps are widely used for their efficiency and energy saving potential, but single-stage vapor-compression heat pump dryers are limited in their ability to achieve high drying temperatures. To address this issue, a heat pump drying system using a solar assisted flash tank vapor injection cycle (HPDS-SFVIC) has been developed. It allows for lower temperature solar energy absorption, resulting in improved heating capacity and drying temperature. The effects of different component configurations and operating conditions on the drying system were evaluated, showing significant performance improvements compared to conventional cycles. The utilization of solar energy leads to higher air temperatures for drying, saving power consumption and improving the heating coefficient of performance (COPh).
Article
Green & Sustainable Science & Technology
Safak Atas, Ilhan Ceylan, Osman Egemen Timar
Summary: The aim of this study was to enhance the efficiency of heat pump systems commonly used for heating in winter. A combined system was created by integrating the heat pump system, solar air collectors, and a heat recovery device. The utilization of these systems together prevented the decrease in energy efficiency that may occur over the course of a day and improved their overall efficiency.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2023)
Article
Energy & Fuels
P. Alfiya, S. Murali, D. S. Aniesrani Delfiya, K. R. Sreelakshmi, G. K. Sivaraman, George Ninan
Summary: This study investigated the drying kinetics, modeling, and quality of Bombay duck using a solar-LPG hybrid dryer. The results showed that the moisture content of the fish decreased to the desired level within a relatively short drying time. The drying process followed the falling rate period, and the drying parameters were successfully fitted into a thin layer drying model. Moreover, the dried fish met the microbial safety standards.
Article
Thermodynamics
Xiang Cao, Jing Zhang, Zhen-Yu Li, Liang-Liang Shao, Chun-Lu Zhang
Summary: Clothes dryers, especially closed-loop heat pump dryers, are significant in modern daily life for their energy-saving benefits. A quasi-steady-state model was developed to predict and analyze electricity consumption and drying time, showing good agreement with test data. Comprehensive optimization based on the model improved specific moisture extraction rate and drying time significantly.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Lan Tang, Qingjian Li, Tao Huang, Hai Chen, Ziyuan Liu, Shiquan He
Summary: Heat pump drying systems are efficient and environmentally friendly drying processes that utilize heat pump technology. The control strategy of the drying process plays a crucial role in improving the efficiency and reliability of heat pump dryers. An auxiliary condenser and evaporator bypass are simple methods to control the heat pump dehumidification rate. This study designed a novel enclosed drying system and experimentally investigated the drying performance and heat pump performance.
JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS
(2022)
Article
Green & Sustainable Science & Technology
Ali Etem Gurel, Umit Agbulut, Alper Ergun, Ilhan Ceylan, Adnan Sozen, Azim Dogus Tuncer, Ataollah Khanlari
Summary: Solar thermal systems are commonly used for sustainable thermal energy, and a temperature-controlled fluidized bed solar drying system has been successfully designed in this study. The efficiency of the system was found to be 64%, with the flat plate and plate with zigzag fins achieving exergy efficiencies of 7.2% and 11.6% respectively. Response surface methodology was used to model moisture content values, showing accurate predictions with high fitting performance.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Green & Sustainable Science & Technology
Houssam Chouikhi, Baher M. A. Amer
Summary: This paper presents a solar dryer with an indirect-mode forced convection and a PV/T air collector. The PV/T air collector produces heated air and electrical energy to facilitate convection drying in the solar dryer. Experimental and numerical simulations were conducted to analyze the performance of the dryer. The experimental results were validated by the CFD modeling, showing good agreement. The daily average efficiencies of the collector, dryer, and PV panel were estimated to be 30.9%, 15.2%, and 8.7% respectively for the solar drying system.
Article
Energy & Fuels
Mesut Abuska, Seyfi Sevik, Arif Kayapunar
Article
Green & Sustainable Science & Technology
Mehmet Resit Serac, Selman Aydin, Adem Yilmaz, Seyfi Sevik
Article
Thermodynamics
Seyfi Sevik, Mesut Abuska
APPLIED THERMAL ENGINEERING
(2020)
Article
Thermodynamics
Seyfi Sevik, Mesut Abuska, Ozgur Ozdilli
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2020)
Article
Engineering, Mechanical
Ozgur Ozdilli, Seyfi Sevik
Summary: Different geometric designs of heat sinks, including those with dolphin fins and various channel structures, significantly enhance heat transfer performance, leading to a 44-62% increase in convective heat transfer compared to standard plate-fin heat sinks without adding mass. The use of fins and optimized geometry in heat sinks can reduce thermal resistance and improve overall thermal performance.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2021)
Article
Construction & Building Technology
Seyfi Sevik, Abdulkadir Kocer, Huseyin Ince, Fazli Engin Tombus
Summary: This study aims to determine the optimal tilt angle for solar collectors or PVs in the province of Corum, Turkey, and evaluates the solar potential of existing building stocks. Adjusting tilt angles and positioning buildings properly can significantly increase efficiency and contribute to decarbonization.
ARCHITECTURAL ENGINEERING AND DESIGN MANAGEMENT
(2022)
Article
Thermodynamics
Mesut Abuska, Seyfi Sevik, Ozgur Ozdilli
Summary: This study experimentally and numerically tested the thermal performance of three different linear housings for medium power LED arrays under various ambient temperatures, showing that Model-3 with inner and outer fins offers lower junction temperature, lower cost, and a safe operating temperature range compared to others. The results demonstrated that the addition of a fan significantly reduced the LED junction temperature, providing a safe operating range and protection against thermal shocks. Forced convection allows the use of smaller housing for lower junction temperature.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Seyfi Sevik, Ozgur Ozdilli
Summary: The study found that the full splayed heat sink demonstrates higher thermal performance compared to other heat sink designs, effectively dissipating heat and reducing LED junction temperature. The most suitable flow direction was determined to be push while the most suitable orientation was found to be upward.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Green & Sustainable Science & Technology
Seyfi Sevik, Ahmet Aktas
Summary: This study analyzes various activities aimed at enhancing efficiency in a 600 kW grid-connected photovoltaic power plant, and achieves satisfactory results such as increased power generation through cleaning and snow removal.
Article
Chemistry, Physical
Seyfi Sevik
Summary: Many universities aim to reduce energy consumption, utilize renewable energy, and create green campuses. This study focuses on the simulation of an on-grid photovoltaic power system at the Vocational Colleges Campus, discussing its integration with a gas-fired trigeneration system and the potential for solar hydrogen generation. The results show that the PV system can support up to 25% of the existing system's electrical energy needs, leading to significant reduction in greenhouse gas emissions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Green & Sustainable Science & Technology
Seyfi Sevik, Ozguer Ozdilli, Mesut Abuska
Summary: This study investigates the effect of dimple depth on thermal performance in a solar air collector (SAC) and finds that convex dimple absorbers with a relative roughness height of 0.32 achieve the highest energy and exergy efficiencies in both back-pass and front-pass applications.
Article
Thermodynamics
Sinan Caliskan, Seyfi Sevik, Ozgur Ozdilli
Summary: The impact of punched triangular longitudinal vortex generators and sinusoidal wavy plates on convective heat transfer was investigated using various approaches. Experimental results showed that the vortex generators, sinusoidal structure, and punched hole significantly improved the thermal performance. The Taguchi technique was utilized to reduce the number of trials and determine the optimal conditions for heat transfer.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Seyfi Sevik, Buenyamin Cicek, Ozgur Ozdilli, Tuna Aydogmus, Zelal Ozer
Summary: The increase in electronic component performance leads to more heat generation, necessitating the development of different heat sink (HS) designs. This study explores a new production method for HSs that offers faster production, lower cost, lighter weight, and quicker design. By stereolithographic, four different geometries of nanocomposite HSs were successfully produced, incorporating nano-aluminum, nano-copper, and graphene-nanoplatelets. Characterization analysis confirmed homogeneous distribution, and experimental and simulation data demonstrated the superior performance of angled and channel heat sink designs, particularly those doped with graphene. The nanocomposite HSs outperformed pure resin HSs by up to 6.5%, and including geometry effects, improved LED lamp junction temperature by approximately 11%. This production technique may also be applied for complex HSs or thermal interface materials in specialized applications.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Mesut Abuska, Seyfi Sevik, Ozgur Ozdilli
Summary: The purpose of this research is to study how convex oval-trench dimples placed staggered on a solar air collector's absorber improve vortex heat transfer. The convex oval-trench dimpled absorber plates achieved the highest energy efficiency in both back-pass and front-pass applications, with a relative roughness height of 0.4 and a mass flow rate of 0.036 kg/s. Compared to flat plates, the oval-trench dimpled absorber plates showed a significant increase in Nu numbers and improved thermal efficiency. The front-pass implementation outperformed the back-pass approach in terms of thermal efficiency.
HEAT AND MASS TRANSFER
(2023)
Article
Chemistry, Physical
Seyfi Sevik, Bunyamin Cicek, Tuna Aydogmus, Hakan Gungunes, Pelin Bayaner
Summary: This study developed new types of radiation shielding materials using stereolithography 3D printing technique. Six different square nanocomposite radiation shielding blocks were prepared with various nano-powders. Two different thicknesses of blocks were analyzed using Mo & BULL;ssbauer spectroscopy. The nano-Cu doped composite block showed the best performance in gamma-ray shielding.
RADIATION PHYSICS AND CHEMISTRY
(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)
