Atlantis Highlights in Engineering最新文献_第4页

Consecutive Operation of a Rock Bed Thermal Energy Storage - CFD Analysis 岩床储热系统连续运行CFD分析

Atlantis Highlights in Engineering Pub Date : 1900-01-01 DOI: 10.2991/ahe.k.220301.009

Y. Muhammad, K. Knobloch, H. Frandsen, K. Engelbrecht

引用次数: 1

Comprehensive Comparison of Different Models for Large-Scale Thermal Energy Storage 大型蓄热模型的综合比较

Atlantis Highlights in Engineering Pub Date : 1900-01-01 DOI: 10.2991/ahe.k.220301.005

F. Ochs, A. Dahash, A. Tosatto, Michael Reisenbichler, K. O’Donovan, G. Gauthier, Christian Kok Skov, T. Schmidt

{"title":"Comprehensive Comparison of Different Models for Large-Scale Thermal Energy Storage","authors":"F. Ochs, A. Dahash, A. Tosatto, Michael Reisenbichler, K. O’Donovan, G. Gauthier, Christian Kok Skov, T. Schmidt","doi":"10.2991/ahe.k.220301.005","DOIUrl":"https://doi.org/10.2991/ahe.k.220301.005","url":null,"abstract":"Large-scale thermal energy storages (TES) are advantageous to bridge the seasonal gap between heat demand and availability of renewables. However, the high investment costs associated with large-scale TES is still seen as a major barrier. Among others, challenges are space availability and the presence of groundwater. The complexity of the processes and interactions motivate the application of simulation tools for planning such systems. For TES optimization, flexible and detailed models are required that allow to investigate different geometries, insulation levels and boundary conditions, e.g. presence of groundwater (GW). In contrast, fast and easy-to-use models are required for simulations of a TES integrated in a larger system. In this work, different TES models are compared in various simulation platforms: COMSOL Multiphysics, TRNSYS, Modelica/Dymola and MATLAB/Simulink. The paper summarizes the features of the different TES models, shows the different concepts to reduce the model complexity and compares the results with respect to thermal losses and temperature stratification. TES Types and geometries include buried tanks (cylinder, cuboid), pits (truncated cone, pyramid stump) and hybrids (cylinder with cone stump, cuboid with pyramid stump). TES can be built either completely buried or partially buried building a dam with (part of) the excavated soil. Detailed 2D and 3D FE models developed in COMSOL Multiphysics were validated against measured data from a pit TES and were used as reference for this study. Some of the models take advantage of symmetry and cylindrical coordinates in order to reduce the model to 2D (cylinder, cone). Within this work, deficiencies could be identified, models could be improved and also the influence of the user was seen. Overall, good to acceptable agreement between the tools was achieved after a review phase and after eliminating bugs and user influence.","PeriodicalId":177278,"journal":{"name":"Atlantis Highlights in Engineering","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126371838","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: 3

Modeling of Infiltration Wells to Reduce Rainwater Runoff of Buildings: A Case Study in Campus of Polytechnic State of Sriwijaya, Indonesia 减少建筑物雨水径流的渗透井建模:以印尼斯里维加亚理工大学校园为例

Atlantis Highlights in Engineering Pub Date : 1900-01-01 DOI: 10.2991/ahe.k.220205.001

R. Pranoto, A. S., R. Ra, Djaka Suhirkam, Viktor Suryan

{"title":"Modeling of Infiltration Wells to Reduce Rainwater Runoff of Buildings: A Case Study in Campus of Polytechnic State of Sriwijaya, Indonesia","authors":"R. Pranoto, A. S., R. Ra, Djaka Suhirkam, Viktor Suryan","doi":"10.2991/ahe.k.220205.001","DOIUrl":"https://doi.org/10.2991/ahe.k.220205.001","url":null,"abstract":"Rainfall in Indonesia is classified as high, indicated by the average which ranges from 2000-4000 mm/year. This potential, on the other hand, often creates problems as a result of rain falling to the surface which usually only becomes surface runoff, inundation, and flooding. Infiltration wells are rainwater conservation technologies that have been widely applied to reduce surface runoff and at the same time increase groundwater reserves. The case study was conducted at the Sriwijaya State Polytechnic Campus, Indonesia. The purpose of this study was to determine the model of infiltration wells for controlling rainwater runoff which is suitable to be applied in the research area. Based on field testing using a doublering infiltrometer, the infiltration capacity value obtained was 3.42 cm/hour. The infiltration well model used in this case is a cylindrical type of impermeable wall, with a diameter of 1 – 1.4 m and a depth of 1.5 – 2.5 m. The simulation was carried out per 100 m rainfed area (roof of the building) for one infiltration well by referring to daily rainfall data for 12 years (2007-2018). The simulation results show that infiltration wells with a diameter (1.2 1.4 m) and depth (2.5 m) were able to reduce rainwater runoff by 68.3% and occurred 1163 times overflow for 12 years. The simulation also revealed that increasing the diameter was more effective in increasing the amount of rainwater runoff reduced than increasing the depth of the infiltration well.","PeriodicalId":177278,"journal":{"name":"Atlantis Highlights in Engineering","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126783581","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: 2

Identification of Road Condition Survey Results on the Making of Map of Palembang City Road Network Based on GIS 基于GIS的巨港城市路网地图制作中路况调查结果的识别

Atlantis Highlights in Engineering Pub Date : 1900-01-01 DOI: 10.2991/ahe.k.220205.032

Norca Praditya, I. Indrayani, Andi Herius, K. Kosim, T. Peryoga, Mendro Anggoro

{"title":"Identification of Road Condition Survey Results on the Making of Map of Palembang City Road Network Based on GIS","authors":"Norca Praditya, I. Indrayani, Andi Herius, K. Kosim, T. Peryoga, Mendro Anggoro","doi":"10.2991/ahe.k.220205.032","DOIUrl":"https://doi.org/10.2991/ahe.k.220205.032","url":null,"abstract":"The road network that is spread throughout the Palembang city certainly has different conditions depending on the use of the road, on some roads that are often flooded or passed by vehicles with excess loads become damaged more quickly before the achievement of the service life of the road, this road damage will certainly cause inconvenience in road use, for this reason road maintenance is needed so that damaged roads can be repaired immediately. The method that can be used in assessing road conditions is the SDI (Surface Distress Index) method, then the results of this assessment can be used as attributes in a road network map, namely by entering these values into a GIS-based thematic map, so that information on road conditions can be easily accessed. easily obtained when the user accesses the location of the road on the map of the existing road network. The initial step taken is to conduct a road condition survey on all roads under the authority of the Palembang City government based on the Palembang Mayor's Decree in 2011. The results of the data analysis show that in general the road conditions in Palembang City are in good condition, this can be seen from the results of the analysis of the length of the road. in good condition of 505,670 km of the total road length of 681.75 km or 74.17%.","PeriodicalId":177278,"journal":{"name":"Atlantis Highlights in Engineering","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126952088","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

Insulating Piles for the Cost-effective Construction of Very Large-scale High Temperature Thermal Energy Storage 超大规模高温蓄能工程的经济高效保温桩

Atlantis Highlights in Engineering Pub Date : 1900-01-01 DOI: 10.2991/ahe.k.220301.007

A. Tosatto, F. Ochs, A. Dahash, C. Muser, Felix Kutscha-Lissberg, P. Kremnitzer

{"title":"Insulating Piles for the Cost-effective Construction of Very Large-scale High Temperature Thermal Energy Storage","authors":"A. Tosatto, F. Ochs, A. Dahash, C. Muser, Felix Kutscha-Lissberg, P. Kremnitzer","doi":"10.2991/ahe.k.220301.007","DOIUrl":"https://doi.org/10.2991/ahe.k.220301.007","url":null,"abstract":"Large-scale thermal energy storage (TES) represents a key component in renewables-based district heating (DH) networks. However, the storage of water at high temperature (< 100 °C) for long periods can lead to a significant amount of thermal losses to the surroundings and to unwanted increase of groundwater temperature. Insulating the side walls is consequently required, but it is associated with large investment costs. Installation represents a high share of the total investment costs of the insulation, which has to be temperature and pressure resistant and resistant against humid environments. Hence, costs-effective insulation installation methods and processes supported by a proper envelope design are crucial. The new approach proposed in this work is based on the use of overlapping bore piles and considers the use of piles filled with foam glass gravel (FGG) as insulation. The advantages of this solution rely on the possibility to reduce the installation costs and on the thermal characteristics of the adopted material. FGG is a frequently used insulation material in underground constructions due to its low thermal conductivity, pressure resistance and draining properties and relatively low cost. FGG can be used with a loose, compacted or bounded configuration. While the loose material outperforms the bounded in terms of thermal conductivity, the second one presents improved structural properties. One approach is to alternate bounded and loose piles where the bounded represent the primary piles and these are overdrilled producing the loosely filled secondary piles. An alternative is to use different degree of compaction in the primary and secondary piles. A compromise between required strength and thermal performance has to be found. The paper reports results of material tests, mock-ups and simulation results.","PeriodicalId":177278,"journal":{"name":"Atlantis Highlights in Engineering","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127366841","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: 1

WebRTC Signaling Mechanism Using npRTC Topology for Online Virtual Classroom 基于npRTC拓扑的网络虚拟教室webbrtc信令机制

Atlantis Highlights in Engineering Pub Date : 1900-01-01 DOI: 10.2991/ahe.k.220205.047

Raswa Raswa, Sumarudin Sumarudin, E. Ismantohadi

{"title":"WebRTC Signaling Mechanism Using npRTC Topology for Online Virtual Classroom","authors":"Raswa Raswa, Sumarudin Sumarudin, E. Ismantohadi","doi":"10.2991/ahe.k.220205.047","DOIUrl":"https://doi.org/10.2991/ahe.k.220205.047","url":null,"abstract":"Equitable quality of education is still a national strategic issue, especially since the Covid-19 pandemic has not yet ended. Learning through Online Virtual Classroom (OVC) is needed to fulfill equal access to quality education for the community. One of the technologies that can be used to build virtual classrooms online is WebRTC (Web Real-Time Communication). WebRTC is a real-time communication technology or web platform that can be run between browsers without the use of various plug-ins. The purpose of this study is to model the WebRTC topology through the signaling mechanism that works in the construction of the OVC. The identification of the OVC feature is integrated with WebRTC as a real-time communication medium, namely Electronic whiteboard, Screen sharing, File transfer, Recording, Chat room, Calendar Integration, and Moderation. Application is developed using Node.js as backend programming and React.js as frontend programming, which is Socket.io for signaling communication. This study proposes a topology using the signaling mechanism of the npRTC model. The research method is quasi-experimental with a forward engineering approach. System testing is carried out to measure network performance with testing parameters including bandwidth consumption, CPU performance, memory usage, throughput, delay, jitter, and packet loss. The results showed that by using the npRTC signaling mechanism, the CPU load, bandwidth requirements, and large memory usage by the client could be reduced, because throughput was increased, and delay, jitter, and packet loss were reduced. This research on the WebRTC signaling mechanism is that the intermediate server for interactive connectivity establishment using a STUN server does not yet involve a TURN server.","PeriodicalId":177278,"journal":{"name":"Atlantis Highlights in Engineering","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127485411","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: 1

Synthesis and Characterization of Cao Catalyst from Snakehead Fishbone Impregnated on Fly Ash for Palm Oil Transesterification 粉煤灰浸渍鱼骨催化棕榈油酯交换Cao催化剂的合成与表征

Atlantis Highlights in Engineering Pub Date : 1900-01-01 DOI: 10.2991/ahe.k.220205.069

Fadarina Fadarina, Toni Okta Fiyansah, Junaidi Bin Mohamad Nasir, R. Junaidi, M. Zamhari, C. Ramayanti, Tri Mawarni

{"title":"Synthesis and Characterization of Cao Catalyst from Snakehead Fishbone Impregnated on Fly Ash for Palm Oil Transesterification","authors":"Fadarina Fadarina, Toni Okta Fiyansah, Junaidi Bin Mohamad Nasir, R. Junaidi, M. Zamhari, C. Ramayanti, Tri Mawarni","doi":"10.2991/ahe.k.220205.069","DOIUrl":"https://doi.org/10.2991/ahe.k.220205.069","url":null,"abstract":"Waste is organic and inorganic materials from factories and households that are not used that can cause environmental pollution. Some of the waste that is widely found in the South Sumatra region is snakehead fishbone waste from the food industry, and coal fly ash from the Steam Power Plant. Snakehead fishbone contain 39.836% calcium. Meanwhile, fly ash is beneficial for catalyst support in transesterification reactions because it has a large surface area and pore size. Based on this description, it is necessary to use waste as a valuable product. One solution is to make a catalyst with CaO as raw material from snakehead fish bones and fly ash as a support, using calcination and impregnation methods. This research aims to produce a catalyst with a short reaction time and calculate the reaction rate with a large % yield. This research was conducted using the wet impregnation method with variations in impregnation temperature (70, 80) oC and variations in the mass of CaO added when impregnated (80, 90, 100) grams, stirring speed 700 rpm, and weight of fly ash 90 grams, with a long time. Transesterification reaction (30, 60, 90, 120) minutes at 60°C using palm oil. The results of this study indicate that the impregnation temperature and the mass of CaO added to the catalyst impregnation stage affect the % yield produced, reaction rate, and reaction time. From this research, it is known that the best catalyst has an impregnation temperature of 80°C, and a mass of CaO 100 grams, with a reaction time of 120 minutes capable of producing methyl ester of 98.55%, with a reaction rate of 4.44×10 -6 mol/gramcat.s. The optimum catalyst has a characterization of 96.03% Ca absorption %, a specific surface area of 70.78 m/g, and the FTIR test results show that CaO is present in the CaO/ fly ash catalyst with an intensity of (77-94) %, at wavenumber (507-592) cm","PeriodicalId":177278,"journal":{"name":"Atlantis Highlights in Engineering","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127822883","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

Design and Configuration of 4G Repeater Booster Device at 1800MHZ 1800MHZ 4G中继器增强器的设计与配置

Atlantis Highlights in Engineering Pub Date : 1900-01-01 DOI: 10.2991/ahe.k.220205.059

Sopian Soim, A. Handayani, Emilia Hesti, Ciksadan Ciksadan, N. Husni, Abu Hasan, Rivaldo Rivaldo

引用次数: 0

Proceedings of the International Conference on Mechanical Engineering (ICOME 2022) 国际机械工程会议论文集(ICOME 2022)

Atlantis Highlights in Engineering Pub Date : 1900-01-01 DOI: 10.2991/978-94-6463-152-4

引用次数: 0

Making Herbal Tea from a Mixture of Butterfly Pea Flower (Clitoria Ternatea) and Ginger Powder (Zingiber Officinale) by using Drying Method According to Indonesian National Standards (SNI) 按印尼国家标准(SNI)烘干法将蝶豌豆花(Clitoria Ternatea)和姜粉(Zingiber Officinale)混合制成凉茶

Atlantis Highlights in Engineering Pub Date : 1900-01-01 DOI: 10.2991/ahe.k.220205.019

S. Sofiah, A. Aswan, Isnandar Yunanto, C. Ramayanti, Putri Desty Amelia, Aliyah Nahda Utami

{"title":"Making Herbal Tea from a Mixture of Butterfly Pea Flower (Clitoria Ternatea) and Ginger Powder (Zingiber Officinale) by using Drying Method According to Indonesian National Standards (SNI)","authors":"S. Sofiah, A. Aswan, Isnandar Yunanto, C. Ramayanti, Putri Desty Amelia, Aliyah Nahda Utami","doi":"10.2991/ahe.k.220205.019","DOIUrl":"https://doi.org/10.2991/ahe.k.220205.019","url":null,"abstract":"Herbal tea is a term for herb flowers, leaves, seeds, roots or dried fruit that is not derived from the tea plant (Camellia sinensis). One of the plants that can be used as herbal teas are butterfly pea (Clitoria ternatea) and ginger (Zingiber officinale). Butterfly pea is known traditionally as an eye medicine, and a food coloring that gives it its blue color. Butterfly pea and ginger have benefits as antioxidants, antibacterial, anti-inflammatory, antidiabetic, anti-cancer, and immunomodulatory properties. The process of making herbal tea is carried out by a drying process using a Tray dryer with the aim of improving the quality and quality of the herbal tea. The method used is with a variation of the drying time of 2 hours; 2,5 hours; 3 hours; and 3,5 hours with a constant temperature of 60C, and variations of ginger powder, namely 1%, 2%, and 3% per total weight of 1 gram per tea bag. The analysis carried out is in the form of organoleptic tests (color, taste and aroma), water content, ash content, and antioxidant activity. Based on the results of the analysis of making butterfly pea herbal tea, drying time of 3.5 hours with a concentration of 3% ginger powder is the best condition according to SNI 3836:2013 with the results of water content 4.25%, ash content 5.04%, and antioxidant activity 57.03%.","PeriodicalId":177278,"journal":{"name":"Atlantis Highlights in Engineering","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116850038","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