Evergreen最新文献_第9页

Small-Scale Organic Rankine Cycle Performance Using an Additional Heat Exchanger 使用附加热交换器的小型有机朗肯循环性能

Evergreen Pub Date : 2023-09-01 DOI: 10.5109/7151720

Dwika Budianto, Budi Ismoyo, None Cahyadi, Euis Djubaedah, Arnas Lubis, None M. Idrus Alhamid

{"title":"Small-Scale Organic Rankine Cycle Performance Using an Additional Heat Exchanger","authors":"Dwika Budianto, Budi Ismoyo, None Cahyadi, Euis Djubaedah, Arnas Lubis, None M. Idrus Alhamid","doi":"10.5109/7151720","DOIUrl":"https://doi.org/10.5109/7151720","url":null,"abstract":": The Organic Rankine Cycle (ORC) power generation system is a unique approach to heat recovery which substitutes an organic fluid with a low boiling point for water. To improve its lower thermal efficiency and maximum power generation, an Internal Heat Exchanger (IHE) is proposed after the expansion scroll expander. Using a small-scale scroll expander ORC testing facility as the simulation model, this study analyzes the net thermal efficiency and energy consumption of the ORC system with and without the IHE under conditions of equivalent power output. While the working fluid's outlet temperature in the evaporator was adjusted from 70 to 130 degrees Celsius, the outlet condenser temperature was kept constant at 55, 60, and 65 degrees Celsius. In the numerical simulation of the small-scale ORC, five distinct working fluids, including R245fa, R123, R1233zd, n-Pentane, and R141b were assessed. The results indicated that R245fa had the largest recuperation effect on the working fluid, followed by n-Pentane, R1233zd, R123, and R141b, with a total thermal energy reduction of 3.34 kW, 2.63 kW, 2.06 kW, 1.9 kW, and 0.92 kW, respectively. In conclusion, the installation of IHE in ORC units leads to improved thermal","PeriodicalId":12085,"journal":{"name":"Evergreen","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135691594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance Test of 1 kW PEM Fuel Cell System to Determine Its Empirical Model 1kw PEM燃料电池系统性能试验，确定其经验模型

Evergreen Pub Date : 2023-09-01 DOI: 10.5109/7151761

Khotimatul Fauziah, None Kurniawan, Asih Kurniasari, Yuli Astriani, Bayu Samodra, Didik Rostyono, None Eniya Listiani Dewi

{"title":"Performance Test of 1 kW PEM Fuel Cell System to Determine Its Empirical Model","authors":"Khotimatul Fauziah, None Kurniawan, Asih Kurniasari, Yuli Astriani, Bayu Samodra, Didik Rostyono, None Eniya Listiani Dewi","doi":"10.5109/7151761","DOIUrl":"https://doi.org/10.5109/7151761","url":null,"abstract":": The proton exchange membrane fuel cell (PEMFC) has a higher power density, so it is suitable to be utilized for powering electric vehicles (EVs) and supporting the grid’s power balance and voltage stability. As its load will vary during operation, the PEMFC system have to manage the fuel feed following load variations. In this study, a dead-end anode-type PEMFC system with a rated power of 1 kW is used to investigate its performance under current loading rates of 0–28 A in steady-state conditions. From the test results, the empirical models were derived and simulated in MATLAB. The test is conducted by measuring the PEMFC stack’s current, voltage, hydrogen flow rate, and purging behavior. The experimental results show a nonlinear correlation between stack current and voltage as well as its efficiency of hydrogen consumption to the electricity generated. The hydrogen flow rate exhibits a linear relationship to the generated power output in normal operation, neglecting the purging flow rate. Meanwhile, the total consumed hydrogen, including purging process, performs an exponential result which indicates more hydrogen was consumed for purging. Moreover, the observed purging behavior shows that the load current affects the purging interval time in an exponential decay manner. Some possible control methods are then discussed to control the hydrogen flow that dynamically follow the load variation and enable a not-complete purge; thus, the hydrogen consumption could be optimized and the excess hydrogen during the purging could be minimized.","PeriodicalId":12085,"journal":{"name":"Evergreen","volume":"375 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135691596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recent Trends and Application of Nanomaterial Based on Carbon Paste Electrodes: A Short Review 碳糊电极纳米材料研究进展及应用综述

Evergreen Pub Date : 2023-09-01 DOI: 10.5109/7151686

Karna Wijaya, None Remi Ayu Pratika, Asma Nadia, Fitria Rahmawati, Rahadian Zainul, None Won Chun Oh, None Wahyu Dita Saputri

{"title":"Recent Trends and Application of Nanomaterial Based on Carbon Paste Electrodes: A Short Review","authors":"Karna Wijaya, None Remi Ayu Pratika, Asma Nadia, Fitria Rahmawati, Rahadian Zainul, None Won Chun Oh, None Wahyu Dita Saputri","doi":"10.5109/7151686","DOIUrl":"https://doi.org/10.5109/7151686","url":null,"abstract":": Carbon paste electrodes (CPEs) are a type of electrochemical sensor that have been widely used for sensing and monitoring various analytes. Recently, there has been a growing interest in incorporating nanomaterials into CPEs to improve their performance and sensitivity. Here are some recent trends and applications of modified CPEs based on nanomaterials, which have been shown to have enhanced sensitivity and selectivity for the detection of various analytes such as those in food and drug samples. The high surface area and electrical conductivity of CPEs make them ideal for use in electrochemical sensing applications. Nanomaterial-based CPEs have also been widely studied for their high sensitivity and selectivity in sensing various analytes. Nanomaterials such as Multi-Walled Carbon Nanotube (MWCNT), Single-Walled carbon Nanotube (SWNCT), Graphene, or other naomaterial have excellent electrical conductivity, large surface area, and high mechanical strength, making it an attractive nanomaterial for use in CPEs. A CPEs-based nanomaterial has been used in electrochemical detection, demonstrating improved sensitivity compared to traditional CPEs. In general, the incorporation of nanomaterials into CPEs has opened up new opportunities for the development of highly sensitive and selective electrochemical sensors for a wide range of applications including environmental monitoring, drug diagnosis, and food safety.","PeriodicalId":12085,"journal":{"name":"Evergreen","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135690297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Gravimetry-Based Fine Particle Concentration Measurement System for Humid Environment Using Graphene Oxide Layer 基于氧化石墨烯层的湿度环境细颗粒浓度测量系统

Evergreen Pub Date : 2023-09-01 DOI: 10.5109/7151690

Arif Budianto, Rahadi Wirawan, None Ramadian Ridho Illahi, None Dian Wijaya Kurniawidi, Susi Rahayu, None A.A. Ngurah Nara Kusuma

引用次数: 0

A Comparison of Hydraulic and Electro-Hydraulic Power Steering Control Systems for Increasing Energy Efficiency 提高能源效率的液压与电液动力转向控制系统的比较

Evergreen Pub Date : 2023-09-01 DOI: 10.5109/7151751

None Meiyanto Eko Sulistyo, Rina Ristiana, Sunarto Kaleg, Abdul Hapid, None Sudirja, Aam Muharam, None Alexander Christhanto Budiman, None Abdul Qodir Jaelani, None Amin

引用次数: 0

A Method Estimating Plug’s Power Usage Pattern for Public Electric Vehicle Charging Stations within Multi-Uncertainty Parameters in Indonesia Urban Area 印尼城市公共电动汽车充电站多不确定参数下插头用电模式估算方法

Evergreen Pub Date : 2023-09-01 DOI: 10.5109/7151744

Asih Kurniasari, None Abdul Wachid Syamroni, None Moch Arief Albachrony, None Galih Prasetya Dinanta, Danang Yogisworo, None Tisha A.A.Jamaluddin, None Abdul Aziz Basharah, None Cuk Supriyadi Ali Nandar

引用次数: 0

Techno-Economic Assessment of a 1,200 Liter Rotary KilnBatch Reactor for the Production of Oil from Plastic Waste 1200升回转窑间歇式反应器塑料垃圾制油技术经济评价

Evergreen Pub Date : 2023-09-01 DOI: 10.5109/7151738

Agus Kismanto, Rizqon Fajar, None Nina K.Supriatna, None Aminuddin, None Fahruddin J.Ermada, Samdi Yarsono, None Riardi P.Dewa, None Lan M.T Nainggolan, Rizal Alamsyah, Adi Surjosatyo

引用次数: 0

Security Challenges in Building Blockchains Bridges and Countermeasures 构建区块链桥梁的安全挑战及对策

Evergreen Pub Date : 2023-09-01 DOI: 10.5109/7151703

None Sai Pranav Krishna, Pushpa Singh

{"title":"Security Challenges in Building Blockchains Bridges and Countermeasures","authors":"None Sai Pranav Krishna, Pushpa Singh","doi":"10.5109/7151703","DOIUrl":"https://doi.org/10.5109/7151703","url":null,"abstract":": The implementation of distributed ledger technologies and Blockchains has recently become high in various domains, from finance to governance. There are multiple Blockchain frameworks and networks for different use cases but still seems to be a gap in how different frameworks, protocols, and ledgers interact with each other. With the increase in the adoption of Blockchains, there is an increasing need for suitable interoperable solutions so that more value can be provided to the end user. This research focuses on analyzing how current Blockchain bridges are built and evaluating common security risks and countermeasures within the scope of interoperability. A threat model is proposed to analyze blockchain interoperability's various components, vulnerabilities, risks, and corresponding mitigation techniques. Common security vulnerabilities like centralization of trust and vulnerable smart contracts and others were identified and classified based on the kind of bridge component along with possible mitigations. Each solution, like Relays, HTLCs, Notary Schemes, and Smart Contracts, is explored. Thus, the study will help developers understand the risks involved by providing insights and pointing out the need for standardization on Blockchain interoperable solutions.","PeriodicalId":12085,"journal":{"name":"Evergreen","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135690291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessment of Respiratory Health Issues Among Stone Carvers of Rajasthan, India 印度拉贾斯坦邦石匠呼吸健康问题的评估

Evergreen Pub Date : 2023-09-01 DOI: 10.5109/7151706

Yogesh Mishra, None Ashish Kumar Singh, None Makkhan Lal Meena, None Govind Sharan Dangayach

引用次数: 0

A Review on the Combustion Characteristics of an Asymmetric Swirling Combustor in Flameless Mode 非对称旋流燃烧室无焰燃烧特性研究进展

Evergreen Pub Date : 2023-09-01 DOI: 10.5109/7151700

None Najib Aminu Ismail, None Mazlan Abdul Wahid, Aminuddin Sa’at, Abubakar Shitu

{"title":"A Review on the Combustion Characteristics of an Asymmetric Swirling Combustor in Flameless Mode","authors":"None Najib Aminu Ismail, None Mazlan Abdul Wahid, Aminuddin Sa’at, Abubakar Shitu","doi":"10.5109/7151700","DOIUrl":"https://doi.org/10.5109/7151700","url":null,"abstract":": As the population of the world is growing rapidly, the demand for energy that is clean and efficient is increasing. Combustion is one of the major ways of energy conversion that produces very high amount of pollutant emission, as such the research arena has been taken over by coming up with combustion processes that are cleaner and efficient by the combustion engineers. Flameless combustion is one of the new techniques discovered by researchers to suppress NOx emission due to the low temperature inside the combustion zone that is well below the dissociation temperature of Nitrogen. Homogenous or proper mixing is another major factor that enhances combustion efficiency. An asymmetric swirling combustor is a unique shaped combustor that was developed by researchers in order to enhance better mixing inside the combustion zone without the need for an external swirler. The review investigated several parameters such as temperature uniformity, fuel flexibility and level of pollutant emission as discussed by researchers and it was found that the asymmetric swirling combustor is very efficient with temperature uniformity of about 0.9, thermal efficiency of 53% and very low NOx and CO of about 2ppm and 24ppm according to researchers. It was recommended that the combustor should be investigated under different flow configurations i.e. forward and reverse flow in order to know the optimum direction of flow for the asymmetric swirling combustor.","PeriodicalId":12085,"journal":{"name":"Evergreen","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135690527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0