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The investigation of influence ammonia concentration variations to the performance of a pump less ammonia-water absorption refrigeration system with water flooding evaporator

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AIP Conference Proceedings 2019年第1期2062卷

作者： Hendra Wijaksana I. N. S. Winaya Made Sucipta Ainul. Ghurri 1)Doctoral Study Program in Engineering Science Udayana University Kampus Jendral Sudriran Denpasar Bali-Indonesia 2)Mechanical Engineering Department Engineering Faculty Udayana University Kampus Bukit Jimbaran Denpasar Bali-Indonesia

An experimental investigation of the influences ammonia concentration variation to the performances of pump less ammonia-aqua absorption refrigeration system with water flooding evaporator is described. The heat generated in generator and refrigerating effect in evaporator, cooling capacity, coefficients of performance (COP) are investigated. The objective of this study is to investigate the characteristic and influences of the ammonia concentration variation to the performance of pump less absorption refrigeration system with water flooding evaporator as a refrigeration load.. In this research, the generator temperature has been setting constant in 80°C using electric heater, the ammonia concentration in 500 ml solution would be varied in 18%, 27%, 37%, 47%, and 59%. It is concluded that heat generated in generator and refrigerating effect in evaporator decrease with increasing ammonia concentration, while the cooling capacity and COP would increase with increasing ammonia concentration. As a result, it is found that increasing the ammonia concentration would effect on increasing of cooling capacity and COP. The highest the ammonia concentration, the highest cooling capacity and COP would be resulted. The highest cooling capacity and COP resulted respectively are 0.7180 kW and 0.829 at 59% ammonia concentration.

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Optimal control scheme on anaerobic processes in biodigesters

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Chemical engineering Transactions 2018年 65卷 433-438页

作者： Cortes, Luis G. Cortes, Santiago Cortes, Luis E. Industrial Informatic and Electronic Industry PhD Informatic Engineering Program University of Seville Campus Reina Mercedes Calle San Fernando 4 Seville Spain Faculty of Mechanics University Antonio Narino Av # 48 Dg. 22 # 64 Loma de Marión Cartagena Colombia Faculty of Exact and Natural Sciences Department of Physical Sciences University of Cartagena Campus San Pablo Kra 50 Nº24-120 Cartagena Colombia

ISBN: (纸本)9788895608624

This paper deals with the development and test optimal control strategies that adapt their operations to confront some unstable circumstances in biological biomass processes, such as variations in the operation conditions, broadly affecting the industrial scale implementation. The complexity on biological reactions inside the process requires appropriate models that represent the phenomena in order to design and build control systems to optimize the process, and keep them away from disturbances. A two-reactor chain mass-balance model has been considered as an approximation to represent biological reactions between the different groups of bacteria immerse on anaerobic process. The model incorporates biokinetic rates, which plays a central role in the dynamical growth speed of bacteria population. An optimal control strategy is proposed to test the improvement on reaction times, compared with standard Proportional-Integral-Derivative (PID) controllers, widely used on the industry. The results show the optimal control strategies react in advance the disturbances;keeping the process on desirable operational conditions. A performance index is used to measure the advantages to use optimal control strategies. Simulations were performed on Matlab. Copyright © 2018, AIDIC Servizi S.r.l.

关键词： Bacteria

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Identification of alteration zones using a Landsat 8 image of densely vegetated areas of the Wayang Windu Geothermal field, West Java, Indonesia

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IOP Conference Series: Earth and Environmental Science 2019年第1期254卷

作者： Kristian Edwin Salamba Arie Naftali Hawu Hede Mohamad Nur Heriawan Mining Engineering Study Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Earth Resources Exploration Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha No.10 Bandung West Java 40132 Indonesia.

Remote sensing is a method usually used for conducting geothermal reconnaissance surveys by mapping surface alteration anomalies, which are captured by a satellite sensor. This study analyzes the characteristics of the surface alteration zones in the Wayang Windu geothermal field (WWGF). It employs a remote sensing method using multispectral Landsat 8 imagery and is validated by ground truth data from field surveys. The WWGF is located in Pangalengan, West Java with an elevation of 1500-2600 m.a.s.l., and lies in a quaternary volcanic arc. The rock types in Wayang Windu consist of andesite, basalt, tuff, breccia, and pumice. Fractures and faults are identified as lineaments in this area and based on their structures, were directed to be oriented northwest-southeast and northeast-southwest. This research combined a field survey and remote sensing methods to enhance the spatial data. Field surveys yield 18 spots for obtaining soil samples and laboratory analyses were performed. Spectral reflectance analysis was performed to determine the reflectance and mineral composition of the samples, X-ray diffraction was performed to determine the mineral composition, and X-ray fluorescence was performed to determine the abundance of elements. A scene from Landsat 8 image acquired on September 10, 2013 was evaluated using a principal component analysis-based method. The surface alteration zones in the WWGF correlated with joints and faults. Based on the mineral composition, the surface alteration zones in WWGF were identified as advanced argillic zone with the occurrence of secondary minerals such as cristobalite and halloysite, and a propylitic zone with the occurrence of secondary minerals such as epidote and chlorite.

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Thermal design of 5 kg capacity coffee bean dryer simulator using Geothermal energy

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IOP Conference Series: Earth and Environmental Science 2019年第1期254卷

作者： J Hendrarsakti M R Firmansyah Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Geothermal Study Program Institut Teknologi Bandung Jl. Ganesha 10 Bandung Indonesia

A coffee bean dryer simulator that would be able to fully simulate the whole process of coffee bean drying using heat recovered from geothermal energy source has been thermally designed. This simulator is planned to educate people living near the geothermal resources or power plants about the direct use of geothermal energy, especially in coffe drying. The maximum capacity of this simulator is 5 kilogram of fresh coffee bean that is dried using hot air at 45°C and mass flow rate of 0,23 kg/s. The duration of drying is about 3000 seconds which should be adequate to represent the drying process. The heat exchanger proposed for this thesis is a compact heat exchanger with staggered pipe arangement. The total number of pipes is 10 pipes at 36 cm in length and 65 flat plate alluminium fins measured at 0,6m x 0,16m x 0,005m. The fin efficiency value and the overall surface efficiency value are 72% and 73% respectively.

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Effects of slurry concentration and rotational speeds of drum drier to the characteristics of pregelatinized breadfruit (Artocarpus altilis) flours

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IOP Conference Series: Materials Science and engineering 2019年第1期557卷

作者： T C Sunarti W S L Br. Sinaga C Pandji Department of Agroindustrial Technology Faculty of Agricultural Engineering and Technology Bogor Agricultural University Indonesia Program Study of Food Science Faculty of Science and Technology University of Pelita Harapan Tangerang Indonesia

Breadfruit is one alternative carbohydrate source in Indonesia. However, breadfruit is seasonal and climacteric crops; it should be processed immediately to produce flour. Native breadfruit flour has many limitations since it is difficult to be solubilized and swollen in cold water. The flour is modified physically by pregelatinization to improve its properties. Pragelatinized breadfruit flour can be used as instant food, porridge, and baby food. This research is aimed to investigate the effect of slurry concentration (20 and 30%) of native breadfruit flour and rotational speeds (4, 6 and 8 rpm) of double drum drier to the chemical composition and physico-chemical properties of the pregelatinized flours. The results showed that pregelatinization did not influence to the chemical composition. Pregelatinization of the flour improved the water solubility and swelling power on room (30°C) and hot (70°C) solutions, reduced the freeze-thaw stability, caused partial gelatinization which is monitored by losing the birefringence of starch granule, and darkened the flour. The pregelatinization also reduced the gelatinization temperature and had low final viscosity. Low concentration of slurry and low rotation speed of drum increased the gelatinized part of the flour, which is influenced to the cold and hot water solubility.

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Chemistry in context: The development of hydrocarbon chemistry and petroleum module based on vehicle case

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Journal of Physics: Conference Series 2019年第1期1156卷

作者： Febrianto A Wiyarsi C F Partana B Sulistyo Study Program of Chemistry Education Faculty of Mathematics and Natural Sciences Universitas Negeri Yogyakarta Indonesia Department of Chemistry Education Faculty of Mathematics and Natural Science Universitas Negeri Yogyakarta Indonesia Automotive Engineering Education Department Faculty of Engineering Universitas Negeri Yogyakarta Indonesia

This study aims to analyze the characteristic, feasibility, teachers' and students' responses of Hydrocarbon Chemistry and Petroleum (HCP) module based on the context of vehicle case on automotive engineering. Exploratory mixed method has been employed in this research. The research procedures used four steps including qualitative, development, quantitative, and interpretation step. The instruments used to collect the data consisting the three questionnaires, one open questionnaire to obtain the validation and two close questionnaires to collect the teachers and students' responses toward the HCP module. HCP module based on the context of vehicle case on automotive engineering program was yielded as a result of this reseach. The characteristic of research product was integrating between chemistry and automotive subject based on basic competence of curriculum and integrated by vehicle context in first chapter, concept map, activities, examples, and exercise. A group of experts consisting two lectures were confirmed that the HCP module has a correct chemistry content. A very good category was given as the response of the teacher. Moreover, the students response were very interest toward the HCP module. The students and the tachers could be utilize the HCP module as learning sources reference to gain a succesfull chemistry learning.

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Automotive engineering chemistry module: Exploring acid base and electrochemistry topic in vehicle context

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Journal of Physics: Conference Series 2019年第1期1156卷

作者： H Febiana C F Partana A Wiyarsi B Sulistyo Study Program of Chemistry Education Faculty of Mathematics and Natural Sciences Universitas Negeri Yogyakarta Indonesia Chemistry Education Department Faculty of Mathematics and Natural Science Universitas Negeri Yogyakarta Indonesia Automotive Engineering Education Department Faculty of Engineering Universitas Negeri Yogyakarta Indonesia

The research purposed to analyze the characteristics of chemistry module on acid-base and electrochemistry topic based on vehicle context, to analyze the feasibility of module according to chemistry learning experts and to analyze the response of chemistry teachers and students of Automotive engineering program (AEP) about this module. This research using mixed methods and exploratory model design. The data collected from expert validation sheets also teachers and students response questionnaire. Technique of data analysis begins by converting qualitative data into quantitative data using Likert scales. Furthermore, the total and average score of each component can be determined from the quantitative data. The result of the average scores were converted into qualitative feasibility criteria according to the rating category. The product of the development was a chemistry module on acid-base and electrochemistry topic based on vehicle context for students in AEP. The experts considered feasibility of the module. This module had assessed by 5 teachers and 10 students. The module assessed by teachers showed a very good response while the module assessed by students showed a good response. Therefore, this module is feasible and can be used as a learning resource for students of AEP to enhance quality of chemistry learning.

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The cellular voice traffic profiling spatial urban land use for South Jakarta

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IOP Conference Series: Earth and Environmental Science 2020年第1期481卷

作者： H M Taki B M Djaja T Nurlambang M Z Lubis R H Koestoer Department of Urban and Regional Planning Faculty of Environmental Design King Abdulaziz University Jeddah Saudi Arabia Department of Archaeology Faculty of Humanities Universitas Indonesia Depok 16424 Indonesia Department of Geography Faculty of Mathematics and Natural Sciences (FMIPA) Universitas Indonesia Depok 16424 Indonesia Department of Geomatics Engineering Batam State Polytechnic Batam 29461 Indonesia Study Program of Enviromental Sciences Universitas Indonesia. 10430 Indonesia

Cellular traffic in the literature can be classified into voice, SMS, and data. Along with the rapid development of internet technology, a cellular operator is required to have spatial-based customer behavior information as the primary data in making business policy. The use of cell phone in Jakarta is remarkably recorded, while competitors among cell phone providers unavoidably follow the costumers' behaviors. Combined methods are applied such as statistical analysis of ANOVA and multiple comparison tests supplemented by the spatial techniques using Geographic Information System (GIS) to review the time and area differences of the voice traffic changes. A cellular provider name Indosat is chosen as a case of voice traffic model data. Simple land-use types of residential classifications are set up and isolated rings of Von Thunen are reconstructed to explain more on the relationship between voice traffic of cell phone and land use distribution. The result of research indicates that the voice traffic highly varies among residential strata and commercial areas. In addition, voice traffics vary between weekdays and weekends depending on the accumulated users.

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Optimization of frequency and stirring rate for synthesis of magnetite (Fe3O4) nanoparticles by using coprecipitation- Ultrasonic irradiation methods

Optimization of frequency and stirring rate for synthesis of...

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2016 engineering Physics International Conference, EPIC 2016

作者： Rahmawati, Retno Permana, Mohammad Gilang Harison, Bill Nugraha Yuliarto, Brian Suyatman Kurniadi, Deddy Engineering Physics Department Faculty of Industrial Technology ITB Bandung40132 Indonesia Physics Study Program Faculty of Sains and Technology UIN SunanKalijaga Yogyakarta55281 Indonesia

Magnetite (Fe3O4) nanoparticles from iron sand as starting materials have been successfully synthesized by using coprecipitation- ultrasonicirradiation methods. This paper reports the preparation and optimization result of ultrasonic frequency and stirring rate during the synthesis process. The frequencies of ultrasonic conducted in this research are 300, 400 and 400 kHz. The stirring rates performed in the synthesis process are varied from 500 to 900 rpm. The qualitative analysis by using X-Ray Diffractometer (XRD) showed that the structure of Fe3O4 nanoparticles have a same phase with ICCD No. 75-0449. Moreover, the quantitative analysis by using Debye-Scherer equation showed that the crystallite size of Fe3O4 ranging from 21 to 25 nm depend on the ultrasonic frequency and stirring rate. Meanwhile, the transmission electron microscopy (TEM) result revealed that the Fe3O4 tend to form spherical shape with little agglomeration on the morphology of the Fe3O4. The magnetic properties of Fe3O4 were investigated by using vibrating sample magnetometer (VSM). The VSM measurement result showed that the Fe3O4 have saturation magnetization (Ms), remanent magnetization (Mr) and coercivity field (Hc) at 25 emu/gram, 6,0562 emu/gram, and 0,0108 T, respectively. Based on the magnetic characterization, the Fe3O4 nanoparticles have a potential to be appliedin biomedical field. © 2017 Published by Elsevier Ltd.

关键词： Magnetite

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Coupled Hydraulic and Mechanics Finite Element Modeling of CO2 Injection into a Layered Isotropic Media Using FEHM

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IOP Conference Series: Earth and Environmental Science 2019年第1期318卷

作者： Herdis Haerusalam David P. Sahara Fatkhan Study Program of Geophysical Engineering Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Ganesha 10 Bandung 40132 Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Insitut Teknologi Bandung Ganesha 19 Bandung 40132 Indonesia Exploration and Engineering Seismology Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Ganesha 10 Bandung 40132 Indonesia

CO2 injection into the hydrocarbon reservoir affects the subsurface mechanics and hydraulic condition. The injection has to be performed in a way that there will be no reservoir and/or top seal failure. In such case, a simulation of the injected fluid propagation needs to be performed to see its possible impact to the top seal and existing major faults. We use finite element method to perform this injection simulation. In this research, we use open source software Finite Element Heat and Mass Transfer Code (FEHM) to simulate CO2 injection processes into reservoir. Subsurface geological model was constructed in a dimension of 3000 m (easting) x 3000 m (northing) x 2000 m (vertical). Vertically, it consists of four layers which represent upper layer (400 m), top seal (200 m), reservoir (900 m), and basement (500m). The grid around the reservoir rocks is refined to give more detail results. The open hole injection is set at 850 - 890 m depth, 1500 m easting and 1500 m northing. The material is assumed to be isotropic. The initial pressure and temperature increase as a function of depth with a pressure gradient of 0.00981 MPa/m and a temperature gradient of 0.025 degrees C/m. A vertical fault is modelled at 600 m eastern to the injection well. Injection process is carried out with 6 kg/s of CO2 injection with simulation time for ten years to see its impact to the fault. A vertical fault is The modelling results show that the CO2 injection will not reactivate the fault at 10 years.

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