检索结果-内蒙古大学图书馆

4th International Symposium on Advances and Innovation in Mechanical engineering, ISAIME 2023

作者： Agus Tri Putra, I.D.G. Septiadi, Wayan Nata Negara, Dewa Ngakan Ketut Putra Nindhia, Tjokorda Gde Tirta Refrigeration and Air Conditioning Study Program Department of Mechanical Engineering Politeknik Negeri Bali Bali Bukit Jimbaran80361 Indonesia Study Program of Doctor in Engineering Engineering Faculty Udayana University Bali Bukit Jimbaran80361 Indonesia

The growth of the metropolitan area has necessitated an increase in the demand for freshwater. One of the issues facing modern life is water treatment plant to supporting the communities. The approaches for treatment of the brackish water were carried out utilizing a wide range of technologies and technology. Many different technologies have been created recently to transform brackish water into freshwater using a variety of methods and equipment. One approach to produce extremely tiny water droplets is ultrasonic vibrating mesh. In this research, the performance of ultrasonic vibrating mesh has been investigated to purified the brackish water. This technique is similar to the distillation method in purification system of water traditionally. The evaluation of performance in this context has revolved around two key metrics: the rate of pure water production and the Total Dissolved Solids (TDS) levels. Notably, the TDS content of brackish water saw a significant reduction, di-minishing by approximately 50 ppm, while the resulting quality of the pure water averaged at 354.6 ppm. Concurrently, the flow rate of pure water output was measured at an impressive 4.3 grams per minute. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Distillation

来源：评论

学校读者我要写书评

暂无评论

Thermo-economic and environmental evaluation of thin film evaporation using novel metal-organic frameworks to enhance solar desalination performance

引用

Process Safety and Environmental Protection 2025年 199卷

作者： Sharshir, Swellam W. Abdo, Mohamed R. Yusuf, Kareem El-Naggar, Ahmed A. Joseph, Abanob Ismail, M. Elsaid, Ashraf Mimi El-Samadony, M.O.A. Abdelfatah, Mahmoud El-Shaer, Abdelhamid Yuan, Zhanhui College of Materials Engineering Fujian Agriculture and Forestry University Fuzhou350002 China Mechanical Engineering Department Faculty of Engineering Kafrelsheikh University Kafrelsheikh33516 Egypt Department of Physics and Engineering Mathematics Faculty of Engineering University of Kafrelsheikh Kafrelsheikh Egypt Department of Chemistry College of Science King Saud University Riyadh11451 Saudi Arabia Physics Department Faculty of Science Kafrelsheikh University Kafrelsheikh33516 Egypt Nano Science and Technology Program Faculty of Science Kafrelsheikh University Kafrelsheikh33516 Egypt Department of Mechanical Engineering Faculty of Engineering Suez University SuezP.O. Box 43221 Egypt Refrigeration and Air Conditioning Technology Department Faculty of Technology and Education Helwan University CairoP.O. Box 11282 Egypt Mechanical Power Engineering Department Faculty of Engineering Tanta University Tanta City Egypt

The growing shortage of freshwater resources has spurred the development of innovative and sustainable desalination technologies. This study presents a thermo-economic analysis of an innovative hemispherical solar still (HSS) enhanced with a novel Metal-Organic Framework (MOF), specifically Iron-Aluminum Benzene Tricarboxylate. The MOF was characterized through structural, morphological, and optical investigations and integrated into the HSS using two enhancement methods: (I) as a nanofluid (MOF-NF) at a 1 wt% concentration in the feedwater, and (II) as a heat localization material (MOF-HL) by dispersing it on a black cotton wick that spans the basin surface. An external condenser (EC) was added to further enhance condensation in a subsequent configuration. Three identical HSS systems were used for comparative performance evaluation: a baseline unit (CHSS) and two modified systems, one with a condenser and one without. The results indicated that both MOF-based approaches significantly improved the thermal performance and freshwater yield of the HSS. Notably, the MOF-HL configuration outperformed the MOF-NF configuration across all performance metrics. The configuration designated as MOF-HL-EC achieved the highest rate of freshwater production, with a 96.16 % increase in distillate productivity compared to the CHSS. Additionally, this configuration exhibited exergy and energy efficiencies of 3.18 % and 61.1 %, respectively—improvements of 80.85 % and 95.72 % over the traditional system. Economically, the MOF-HL-EC configuration reduced the production cost of distilled water to 0.0115$ per liter, marking a reduction of 25.29 %. © 2025 The Institution of Chemical Engineers

关键词： Iron analysis

来源：评论

学校读者我要写书评

暂无评论

Integration of the PEMFC with a hydrogen production device adopting sodium borohydride and metal cobalt catalyst

引用

International Journal of Hydrogen Energy 2024年第PartB期52卷 905-916页

作者： Chang, Pai-Chun Lai, Jyun-Lin Huang, Ching-His Kuan, Yean-Der Department of Refrigeration and Air Conditioning and Energy Engineering National Chin-Yi University of Technology 411 Taichung Taiwan Ph.D. Program Intelligent Machinery and Smart Manufacturing National Chin-Yi University of Technology 411 Taichung Taiwan

Hydrolysis technology that releases hydrogen from chemical hydrogen storage materials is a method to produce hydrogen. Hydrogen storage has excellent development potential and is also one of the sources of large amounts of hydrogen. A sodium borohydride hydrogen production experiment was carried out based on steam hydrolysis technology. The system reaction tank is divided into a water-carrying bed and a catalyst bed. A mixed aqueous solution with a concentration of 1 wt% sodium hydroxide (NaOH) + 10 wt% sodium borohydride (NaBH4) was used for the hydrogen production reaction test. These experiments determined the appropriate aqueous solution and water vapor combination, and optimal parameters for hydrogen production. The hydrogen production catalyst powder, blend ratio, different steel ball ratios, and ball milling time at the steam hydrogen production end will all affect the powder's fineness and hydrogen production stability. Under catalyst temperature control, the by-products solidify at a specific temperature, which affects the gas passage and causes blockage. Increasing the hydrogen production in an aqueous solution requires a Co2+/Al2O3 catalyst, or a temperature control method to catalyze hydrogen production to obtain stable hydrogen production suitable for emergencies without hydrogen storage containers. This experiment built a hydrogen production system combined with a fuel cell for power generation testing. The test process and results indicate whether the aqueous solution and steam technology can be an effective solution when the hydrolysis hydrogen production technology is matched. © 2023 Hydrogen Energy Publications LLC

关键词： Hydrogen production

来源：评论

学校读者我要写书评

暂无评论

Design and fabrication of composite current collector used in 2-cell stacks for portable power generator

引用

International Journal of Hydrogen Energy 2024年 54卷 294-304页

作者： Wang, Chong-Kai Kuan, Yean-Der Ph.D. Program Intelligent Machinery and Smart Manufacturing National Chin-Yi University of Technology Taichung411 Taiwan Department of Refrigeration and Air Conditioning and Energy Engineering National Chin-Yi University of Technology Taichung411 Taiwan

This study designed a planar carbon fiber composite collector plate with excellent conductivity and mechanical strength for use in the proton exchange membrane fuel cell (PEMFC). The collector plate is made of phenolic resin mixed with conductive particles such as graphite powder, and coated onto carbon fiber cloth. After the solvent is allowed to evaporate, the prepreg is cut and stacked layer by layer into a mold for the heat pressing process at 150 °C. The resin in the carbon fiber prepreg cloth is cured into a carbon fiber composite board. A computer numerical control (CNC) engraving machine was used to engrave the carbon fiber composite board into the current collector shape. The carbon fiber composite current collectors were placed into a high temperature furnace for the carbonization process. The resin between the carbon fibers is removed by the high temperature to increase conductivity. The carbon fiber composite collectors were assessed for conductivity, mechanical strength, and performance. Afterwards, a planar two cell fuel cell stack was assembled for testing performance and stability. A printed circuit board (PCB) was used to design the circuit and the planar two cell fuel cell module made using the heat pressing process. The planar two cell module was combined with a small hydrogen storage tank to form a portable power generation device. © 2023 Hydrogen Energy Publications LLC

关键词： Carbon fibers

来源：评论

学校读者我要写书评

暂无评论

Investigation of Calcination Duration on the Surface Morphology and Specific Surface Area of Zeolite-Chitosan Composite with Oil Palm Ash for Potential Water Contaminant Remediation

Investigation of Calcination Duration on the Surface Morphol...

引用

2023 International Conference on Applied Sciences and Material Applications, ICASMA 2023

作者： Suka, Khairunnisa Frida, Erna Rianna, Martha Bonardo, Doli FMIPA Universitas Sumatera Utara Jl. Bioteknologi I Kampus USU Medan20155 Indonesia Refrigeration and Air Conditioning Engineering Study Program Politeknik Tanjungbalai Jl. Sei Raja Sei Tualang Raso Tanjungbalai21345 Indonesia

This research investigates how varying calcination durations affect the surface characteristics of a Zeolite-Chitosan composite with oil palm ash, aiming to determine its water contaminant removal potential. Three different calcination durations (1, 2, and 3 hours) are studied. The synthesis involves mixing oil palm ash with Zeolite-Chitosan, followed by varying-duration calcination. Scanning electron microscopy (SEM) and surface area analysis (SAA) are used to assess surface characteristics. Initial findings indicate that changing calcination duration significantly impacts the composite's surface features and specific surface area. Longer calcination leads to increased surface roughness and higher specific surface area. The 3-hour calcination results in the highest surface roughness and specific surface area among the durations tested. These findings suggest that calcination duration is crucial in altering the composite's structural properties, which could affect its efficacy in adsorbing water contaminants. Ongoing research aims to better understand the relationship between calcination duration and the composite's adsorption performance, ultimately optimizing the synthesis of the Zeolite-Chitosan composite with oil palm ash for efficient water contaminant remediation. © 2023 Institute of Physics Publishing. All rights reserved.

关键词： Calcination

来源：评论

学校读者我要写书评

暂无评论

Bioaccessibility of total phenolics and antioxidant activity of melon slices dried in a heat pump drying system

引用

Journal of Food Measurement and Characterization 2022年第3期16卷 2154-2171页

作者： Özkan Karabacak, Azime Tunçkal, Cüneyt Tamer, Canan Ece Çopur, Ömer Utku Yolci Ömeroğlu, Perihan Department of Food Engineering Faculty of Agriculture Bursa Uludag University Bursa Gorukle16059 Turkey Electric and Energy Department Air Conditioning and Refrigeration Technology Program Yalova Community College Yalova University Yalova77100 Turkey Science and Technology Application and Research Center Bursa Uludag University Bursa Gorukle16059 Turkey

For drying of heat-sensitive crops at low temperature and humidity, heat pump drying (HPD) could be a useful option. The aim of this study was to investigate the effect of HDP process conditions on total phenolic content (TPC), antioxidant activity (AA) and their in-vitro bioaccessibility of the melon slices and to optimize HPD conditions to obtain dried product with high bioactive properties. Drying air temperature (35–45 °C), air velocity (5–9 m/s) and slice thickness (0.5–1 mm) were selected as variables for Box-Behnken experimental design. Depending on the stability of the phenolics, physical changes of the matrix, and the HPD conditions, both incremental (2–114.39%) and decremental (5–47%) effects of drying were observed for AA and TPC of the melon slices. After in vitro digestion, dried melon slice was found to contain higher amounts of bioaccessible total phenolics (up to 165%) and AA measured by DPPH assay (up to 188.19%) compared to fresh melon slices, on the other hand bioaccessibility of AA by CUPRAC and FRAP assays after digestion decreased (up to 63%) by drying process. The relation between the responses (AA, TPC and their in-vitro bioaccessibility) and the variables were best fitted to quadratic, reduced quadratic and reduced cubic models with high R2 values by response surface methodology. The optimal condition for all responses with composite desirability of 0.777 was: 35 °C drying air temperature, 0.5 m/s drying air velocity and 9 mm slice thickness. Melon slices dried by HPD could be accepted as an innovative snack for health-conscious consumers. © 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

关键词： Drying

来源：评论

学校读者我要写书评

暂无评论

First and second law analyses of wastewater cooled condenser for a refrigeration system

First and second law analyses of wastewater cooled condenser...

引用

作者： Karacayli, Ibrahim Altay, Lutfiye Hepbasli, Arif Air Conditioning and Refrigeration Technology Program Ege High Vocational School Ege University Bornova Izmir35100 Turkey Department of Mechanical Engineering Faculty of Engineering Ege University Bornova Izmir35100 Turkey Department of Energy Systems Engineering Faculty of Engineering Yaşar University Bornova Izmir35100 Turkey

In this study, a vapour compression refrigeration (VCR) system with a wastewater (WW) cooled condenser at a temperature range of 27-29°C was designed. The cooling capacity of the system using R134a as the refrigerant was 1.09 kW. The condenser consisted of a coaxial heat exchanger with a capacity of 1 kW. This paper dealt with energy and exergy analyses of the VCR system using WW, as a heat sink. Experiments were performed in order to evaluate the energetic and exergetic performances of the wastewater-cooled condenser (WWC) and the overall system. The convective heat transfer coefficient of WW and refrigerant in the condenser, overall heat transfer coefficient of the WWC, total amount of heat removed by WW, amount of cooling effect, coefficient of performance (COP), exergy destruction rate, and second law efficiencies of the WWC and VCR system were calculated under different WW temperatures and flowrates. Increasing volumetric flowrate of WW from 200 L/h to 400 L/h caused 4.4% improvement in COP, 12.0% reduction in exergy destruction, and 10.3% increase in exergy efficiency. © 2019 Inderscience Enterprises Ltd.

关键词： Exergy

来源：评论

学校读者我要写书评

暂无评论

Change in heating energy requirements for various interior space temperatures: A case study of Karabuk

引用

Energy Education Science and Technology Part A: Energy Science and Research 2013年第4期31卷 1983-1990页

作者： Erturk, Mustafa Alevay Kocyigit, G. Cay, Yusuf Coskun, Can Oktay, Zuhal Balikesir University Vocational College Air Conditioning and Refrigeration Program Balikesir Turkey Balikesir University Institute of Graduate Studies in Science Mechanical Engineering Balikesir Turkey Karabuk University Mechanical Engineering Karabuk Turkey Recep Tayyip Erdogan University Energy Systems Engineering Rize Turkey

In this study, the effect of indoor temperature for heating on reduction of heating load in Karabuk province was studied for various cases. The potential heating degree-hour values for Karabuk are utilized by using average outdoor temperature distribution of the city. Heating degree-hour values of Karabuk province were estimated according to eleven different indoor reference temperatures (18-28°C). The average outdoor temperature distributions of Karabuk are calculated by utilizing the set of the past 32 years obtained from Turkish State Meteorological Services. The results show that heating loads heating load can be decreased by 47.5% and 4.9% for 18 °C and 28 °C indoor design temperatures, respectively. It is considered that these new method is very useful tools for governments to identify the cities with significant potentials for the reduction of the heating loads. © Sila Science.

关键词： Temperature distribution

来源：评论

学校读者我要写书评

暂无评论

Navy's CFC & Halon elimination program

引用

NAVAL ENGINEERS JOURNAL 2000年第1期112卷 91-112页

作者： Toms, GS Breslin, DA Brunner, GP Thill, JC Gregory S. Toms RE:is the CFC & Halon Elimination Program Manager for the Naval Sea Systems Command (NAVSEA). He received a master of science degree in mechanical engineering from the University of Maryland and a B.S. degree in mechanical engineering from West Virginia University. From 1984 to 1997 he was employed at the Naval Surface Warfare Center Carderock Division Annapolis Detachment (formerly David Taylor Research Center) where he worked on the development of advanced centrifugal compressor air conditioning plants for shipboard applications. He received the Stratospheric Ozone Protection Award in 1998 from the U.S. Environmental Protection Agency in recognition of his exceptional leadership and technical achievements in eliminating ozone-depleting substances from Navy ships. He is licensed as a registered Professional Engineer in the state of Texas. David A. Breslin P.E.:is the Director of Technical Operations for the Naval Surface Warfare Center and is the Chairperson of the ASNE Committee on Environmental Engineering. He received a master of science in aerospace engineering from Virginia Tech in 1991 a master of engineering administration in industrial & systems engineering from Virginia Tech in 1991 and a bachelor of engineering in mechanical engineering from Stevens Institute of Technology in 1985. From 1993 to 1997 he was the program manager of the Naval Sea Systems Command's CFC & Halon Elimination Program. Because of his many efforts he received a Stratospheric Ozone Protection Award in 1995 from the U.S. Environmental Protection Agency in recognition of “exceptional contributions to global environmental protection”. Gregory P. Brunner:was employed by the Carderock Division of the Naval Surface Warfare Center and Naval Sea Systems Command (NAVSEA) from 1983 until 1997. From 1993 to 1997 he served as the R&D program manager for the NAVSEA CFC & Halon Elimination Program Office. Program efforts resulted in the development of new refrigerants for backfit into existing shipboard air-conditioning

The domestic production of the most powerful Ozone-Depleting Substances (ODSs) has permanently ceased and the abundant supplies of a number of inexpensive refrigerants, fire-fighting agents, and solvents, once taken for granted, are now a thing of the past. The Navy's original strategy of conserving ODSs, converting systems and processes where feasible, relying on strategic reserves where necessary, and developing "ozone-friendly" equip ment for new-design surface ships and submarines is succeeding. The purpose of this paper is to document the Navy's efforts to date relative to combating the threat to uninterrupted Fleet operations posed by the cessation of ODS production. Specifically, this paper addresses the Navy's shipboard conversion programs for air-conditioning and refrigeration (AC&R) systems, the development of next-generation AC&R systems, the selection of halon substitutes for new-construction fire-fighting systems, and the Navy's alternative to CFC-113 in the cleaning of critical oxygen systems.

关键词： conversion program Ozone depleting substances trichlorotrifluoroethane GRANTS fire fighting strategic reserves Solvents oxygen systems Submarine Halons

来源：评论

学校读者我要写书评

暂无评论

Exergetic, Sustainability and Exergoeconomic Analyses of a Fully Photovoltaic-Powered Heat Pump Tumble Dryer

SSRN

引用

SSRN 2024年

作者： Atalay, Halil Tunçkal, Cüneyt Türkdoğan, Sunay Direk, Mehmet Department of Mechanical Engineering Faculty of Engineering Yalova University Yalova77200 Turkey Department of Electric and Energy Air Conditioning and Refrigeration Technology Program Yalova Community College Yalova University Yalova77100 Turkey Department of Electrical and Electronics Engineering Faculty of Engineering Yalova University Yalova77200 Turkey Department of Energy Systems Engineering Faculty of Engineering Yalova University Yalova77200 Turkey

In this study, the experimental performance of a commercial heat pump tumble dryer (HPTD) system integrated with photovoltaic (PV) was evaluated using energy and exergy analysis. Additionally, a sustainability and exergoeconomic performance analysis of system components was conducted to identify components in need of improvement. Only 17.6% of the energy generated by the panels was consumed by the HPTD system, with the remaining portion being utilized by other laboratory devices connected to the same grid, contributing to a sustainable future. In addition to meeting the energy demand, the PV system satisfied the entire power requirement of the HPTD system. It was determined that the drying chamber and the compressor together accounted for 74.53% of the total exergy destruction in the system, with this cost being predominantly incurred during the drying process. Moreover, based on the exergy, sustainability, and exergoeconomic analyses conducted, it was concluded that the drying chamber, integrated with the fan unit, exhibited the lowest exergy efficiency (57.04%), the highest waste exergy ratio (0.83) and the lowest exergoeconomic factor value (0.716) among the system components, indicating the need for improvement in the fan-integrated drying chamber. © 2024, The Authors. All rights reserved.

关键词： Exergy

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：