Indonesia Conference Directory

Corresponding Author
Arief Rahman Hidayat

Institutions
1University of Brawijaya, Indonesia

Abstract
Renewable energy sources that photovoltaic is promising CO2 free alternatives. Photovoltaic has the smallest efficiency value compared to electricity generation from other sources. The effort to increase the efficiency of photovoltaic can use the Maximum Power Point Tracking (MPPT). The purpose of the MPPT method is to find the maximum power point of the photovoltaic. In this research, optimize maximum power point photovoltaic using MPPT Incremental Conductance (MPPT IC) based PID controller. The DC-DC converter used is the SEPIC converter. The advantage of the SEPIC converter is that the efficiency produced is better than the Buck-Boost converter and Chuck converter. Another advantage of SEPIC Converter has non-inverting output voltage polarity with the input voltage. The results of this study found that using the MPPT IC based PID controller can increase efficiency power output photovoltaic than using MPPT IC conventional.

Keywords
Incremental Conductance, SEPIC Converter, PID, Photovoltaic

Topic
Renewable Energy

Link: https://ifory.id/abstract/Mfzy9DcvCGTj

Corresponding Author
Binar Surya

Institutions
1 State polytechnic of Malang, Jl. Soekarno Hatta No.9, Jatimulyo, Kec. Lowokwaru, Malang City, East Java 65141

Abstract
This research is about optimizing the dry-system geothermal power plant. To optimizing the performance of a Geothermal Power Plant (PLTP) can be done in various ways, one method which can be use is add an Organic Rankine Cycle (ORC). The ORC would be install on the PLTP turbine output. Use the heat of the steam that come out after expansion process in the turbine to evaporated the working fluid (WF) on the ORC evaporator. The ORC is consisting of 4 main systems or components, Evaporator system, Turbine system, Condenser and Pumping system and the Reservoir Tank as additional equipment. Choose R290 as working fluid (WF) among four other candidates such as R134a, R600, R600a, and R152a. The ORC system optimization is focused on the number of WF masses that can generated on the ORC evaporator system. The ORC analysis results in a total energy of 11589 kW with thermal efficiency of 17%. Energy produced by ORC can increase PLTP energy production by 9%.

Keywords
Geothermal, Power Plant, Organic Rankine Cycle, Energy Conversion

Topic
Renewable Energy

Link: https://ifory.id/abstract/cZJPCWhqjGbD

Corresponding Author
Farid Dwi Murdianto

Institutions
Politeknik Elektronika Negeri Surabaya

Abstract
This paper shows that the design and implementation of a parallel full bridge DC-DC converter for a maximum power point tracker (MPPT) system with an incremental conductance method. This system consists of a parallel full bridge DC-DC converter that will increase the output voltage of solar panels with a power of 3x200 WP. The output voltage of the converter will be converted into AC voltage by single phase inverter by using SPWM switching. The results of this system will be used to supply the water pump loads with a power is 125 watts and a frequency of 50 Hz. The system used is able to increase the output power of solar panels with an average value of 19.68% for a 100 watt incandescent lights arranged in series, the load using a water pump with no load conditions that is equal to 35.91%, while the load using a water pump with load conditions that is equal to 21.19%.

Keywords
Incremental Conductance, MPPT, Parallel Full Bridge DC-DC Converter, Single Phase Inverter

Topic
Renewable Energy

Link: https://ifory.id/abstract/9kK38jqEPzmh

Corresponding Author
Farid Dwi Murdianto

Institutions
Politeknik Elektronika Negeri Surabaya

Abstract
Renewable energy is needed as an alternative energy source. One of the implementations of renewable energy is the Solar Power Plan. Solar Power Plan is a component that uses solar cells to convert solar energy into electrical energy. Unfortunately, the output power of this solar cell depends on the intensity of the light which causes the output power to enter the load to be unstable. Sometimes the PV power decrease because of the shading effect. From this problem a converter is needed to store energy and keep the system output voltage stable. The converter used in this paper is the zeta converter. This Zeta converter can operate like a buck boost converter. The output of the system used is not stable. So that to stabilize it requires good control. In this paper using PI controller to control this system in order to keep the output system stable. The average error after controlling the converter circuit is 0.34%. So that the efficiency of the system can achieve 99%.

Keywords
Photovoltaic, Zeta Converter, PI Controller, DC Nanogrid

Topic
Renewable Energy

Link: https://ifory.id/abstract/WkcVMDjfbdhP

Corresponding Author
Joice Manga

Institutions
1) Department of Chemical Engineering, Politeknik Negeri Ujung Pandang
2) Department of Chemistry, Mathematics and Natural Science Faculty, Hasanuddin University

Abstract
Utilization of by-products from the cooking oil industry, such as palm oil fatty acid distillates (PFAD) can reduce the cost of producing ethyl ester/biodiesel. This PFAD is processed into biodiesel using solid SO₄²ˉ/TiO₂-SiO₂ catalyst and ethanol reagent. The central composite design in Response Surface Methodology is applied in optimizing the effect of process variables such as the amount of catalyst, the molar ratio between ethanol / PFAD and reaction time. The results of the study recorded that the best-operating conditions with 98.89% ethyl ester conversion were achieved with a catalyst amount of 5% w, a molar ratio of 13 in a reaction time of 2.25 hours. The presence of SO₄²ˉ/TiO₂-SiO₂ catalyst components can be characterized using SEM-EDX. A functional group showing the presence of ethyl ester in biodiesel products has been identified using FTIR. Ethyl ester properties related to biodiesel properties can be shown as saponification value: 583.8446 mg/g, iodine value: 8.8714 mg/g and cetane value: 53.4.

Keywords
Biodiesel, Ethyl ester, Palm fatty acid distillate, Response surface methodology

Topic
Renewable Energy

Link: https://ifory.id/abstract/xXrBnhPLWHKC

Corresponding Author
Rini Nur Hasanah

Institutions
1-Electrical Engineering Department, Universitas Brawijaya, Malang, Indonesia
2-Electrical Engineering Department, Cal Poly State University, San Luis Obispo, USA

Abstract
This paper presents a hybrid power controller for electrical systems that incorporates AC and DC sources and loads to power a residential house. The controller is designed to optimize power consumption to draw power primarily from DC, renewable sources as well as draw power from AC, non-renewable sources only when supply from DC sources are insufficient. The device controls power delivered to AC and DC loads and power supplied by AC and DC. The first version of the hardware of the controller was designed and constructed to demonstrate the concept. Results from hardware tests utilizing solar panel, AC grid, and battery as energy sources showed the successful operation of the hybrid controller. The hybrid controller was able to supply a total of 1600W power from pre-conditioned 24V input voltages to a hybrid house with various AC and DC with different voltage and power requirements.

Keywords
ac/dc house, hybrid controller, optimization, power consumption, power controller

Topic
Renewable Energy

Link: https://ifory.id/abstract/R8whTcQYarV3

Corresponding Author
Farid Dwi Murdianto

Institutions
Politeknik Negeri Madura

Abstract
Partical Swarm Optimization (PSO) is one algorithm that aims to get a minimum or maximum function. This algorithm is based on the behavior of a flock of birds where between individuals influence each other in one group. In this study PSO will be implemented to overcome the problem of power flow at the plant. In this PSO algorithm, the search for solutions is carried out by a population consisting of several particles. The population is randomly generated with the smallest and largest value limitation. This population represents a generator in an electric power distribution system. The plant used in this study was IEEE 30 bus. In IEEE 30 bus there are 6 plants that must be optimized. The IEEE PSO implementation is able to produce 227 MW of power or around 70 MW lower (cheaper) than Newton Raphsons and Fast Decoupled power flow optimization method.

Keywords
Particle Swarm Optimization, Power Flow, IEEE 30 Bus

Topic
Renewable Energy

Link: https://ifory.id/abstract/CUk9XNWRm6PM

Corresponding Author
Samsul Hidayat

Institutions
(1)Brawijaya Volcano and Geothermal Research Center, UniversitasBrawijaya, Malang, Indonesia
(2)Faculty of Sciences, UniversitasNegeri Malang, Indonesia
(3)Lab., of Measurement & Circuit System, UniversitasBrawijaya, Malang, Indonesia

Corresponding author : sukir[at]ub.ac.id

Abstract
ABSTRACT Cangar Hot Springs (CHS) located at flank of Arjuno-Welirang Volcano Hosted Geothermal Field in Batu city, East Java has a high potential as pilot project of regional in the frame of Ecotourism and Edu Techno Park development. A few hot spring found in the Arjuno-Welirang volcanic complex, such as Padusan hot spring, Songgoriti hot spring, Kasinan hot spring, and Cangar hot spring. Based on previous Peak Ground Acceleration observations, the area was concluded a safe zone indicated by low seismic index. Furthermore, based on the self potential investigations, the fluid flow around CHS can be predicted that the direction of hot fluid flow spread from southeast to northwest. This results can be used to consider a high potential for Eco tourism of CHS mainly related to the use of hot springs and community education related to volcano hosted geothermal. We develop a concept and observed some aspect to improve the development CHS area as Ecotourism and Edu Techno Park. In addition, the visual observation shows that the occurrence of solfatara and fumaroles with magmatic gasses indicated the existence of a volcanic geothermal system in the subsurface around Arjuno-Welirang volcano hosted geothermal complex. This visual observation can be done direct from the developed Cangar Techno Park area on UniversitasBrawijaya for monitoring of ArjunoWelirang volcanic eruption as part of integrated ecotourism concept and idea to community education for developing of geothermal prospecting area.

Keywords
Cangar Hot Spring (CHS), ArjunoWelirangvolcano, Ecotourism, Edu Techno Park

Topic
Renewable Energy

Link: https://ifory.id/abstract/b8x4a27NnpQX

Corresponding Author
Pugar Septia Girdayanto

Institutions
a) Graduate School Hasanuddin University, Jalan Perintis Kemerdekaan Km 10, Tamalanrea. Graduate School Building, Makassar, 90245. South Sulawesi, Indonesia
b) Graduate School Hasanuddin University, Jalan Perintis Kemerdekaan Km 10, Tamalanrea. Graduate School Building, Makassar, 90245. South Sulawesi, Indonesia

Abstract
After established as the Capital of Kepulauan Seribu Regency in 2003, Pramuka Island became one of the most populous small islands with rapid population growth and increasing tourism visit every year. However, it contributes to the high consumption of groundwater reserve as the main freshwater resources in Pramuka Island. Furthermore, the rainwater catchment area also decreases over the year as growing population trigger the conversion of the open area into building, concrete pavement, and asphalt road. Therefore, rainfall infiltration is blocked and the natural recovery process of groundwater reserve is terminated. As a result, unbalanced freshwater supply and demand have taken place for years because the main natural supply of freshwater in Pramuka Island are only groundwater and rainwater. Moreover, according to the research which was conducted by Cahyadi 2013, natural freshwater carrying capacity in Pramuka island has been overshot since there was no freshwater found in aquifer layer of Pramuka Island in the dry season. Consequently, Rain Water Harvesting is selected to fulfill freshwater supply in Pramuka Island since another option such as seawater desalination installation system is not feasible economically. Rain Water Harvesting is expected to improve freshwater resources carrying capacity in Pramuka Island by providing sufficient freshwater supply from rainwater. The forecast of Rain Water Harvesting Implementation in Pramuka Island for the next 30 years shows that the system can increase freshwater resources carrying capacity in Pramuka Island into 1,22. The estimated maximum supply of freshwater that could be provided by rainwater harvesting for the next 30 years would be applied as a recommendation in development plan and policy to limit tourism visit to ensure the sustainability of freshwater resource for inhabitants and ecosystem in Pramuka Island

Keywords
Carrying Capacity, Rain Water Harvesting, Small Island

Topic
Renewable Energy

Link: https://ifory.id/abstract/He4bT6qfF2jt

Corresponding Author
Fitria Tahta Alfina

Institutions
1Teacher Training and Education Faculty, Sebelas Maret University, Indonesia
2School of Environment and Society, Tokyo Institute of Technology, Japan

Abstract
Abstract: Among the keys to successful industrialization in the field of renewable energy is the availability of ready-to-work human resources in the industry. Although Indonesia has a lot of potential renewable energy, the development of its utilization is still small. One obstacle is the lack of development of industries that develop renewable energy that are not supported by the readiness of human resources ready for work in the field. Indonesia has a very large renewable energy potential, but the utilization is still not maximal. One of these obstacles is the lack of human resources that is in the way it is an effort to improve the quality human resources to achieve the development of maximum renewable energy is through education. Furthermore, good, unknown and unique social technical education technical and Vocational School is a place to start the development of the individuals awareness of the individual who is traveling vocational education, about renewable energy sources. A survival surgical renewal of source of energy is distributed to 82 respondents from different education class levels. Respondents consist of education students of vocational techniques of engineering machinery and Vocational School students Department of engineering machinery. This study will be one of the reference in determining the direction of national policy especiallyin education in the field of development of renewable energy in Indonesia.

Keywords
Renewable energy, Awareness, Vocational School, Education Policy

Topic
Renewable Energy

Link: https://ifory.id/abstract/32frcLFmE4KJ

Corresponding Author
nandang mufti

Institutions
UM

Abstract
Solar cell-based Copper Indium Gallium Selenide (CIGS) is one type of solar cell that has high efficiency. However, the most commonly used vapor deposition technique to deposit CIGS is a technique that requires high environmental control and cost. The research aims to produce thin-film CIGS with hot injection methods. Variations of the Decantation 4, 6 and 8 times were performed to acquire the pure CIGS nanoparticles carried out to study their influence on phases, crystal structures, morphologies, and optical properties at the same time to the methods of deposition of the Doctor Blade. CIGS Film is defied over the ITO substrate with the Doctor blade technique. The XRD diffraction pattern shows the structure of tetragonal crystals. CIGS grain size increases with the number of oleylamine solvent decantation processes. SEM results indicate that CIGS can be deposited evenly throughout the substrate surface. CIGS with decantation process as much as 8 times easiest to be deposited with the best properties to be applied as easy and cheap CIGS solar cell.

Keywords
CIGS, decantation oleylamine, hot injection, doctor blade

Topic
Renewable Energy

Link: https://ifory.id/abstract/YmP9T8x4BgHU

Corresponding Author
Mukhamad Suhermanto

Institutions
(a) Department of Mechanical Engineering, Faculty of Engineering, Universitas Negeri Malang, Indonesia
(b) Purdue University, Mechanical Engineering, West Lafayette, IN, USA

Abstract
This paper presents the comparative techno-economic analysis on three different renewable energy sources (i.e. Solar (Thermal and PV) and Wind Energies (WE)) paired with two desalination systems (i.e. Multistage Flash (MSF), Multiple-effect Distillation (MED) and Reverse Osmosis (RO)). The aim of this investigation is to provide thorough technology and economic analysis on the renewable-energy-driven desalination system for Nusa Tenggara Timur (NTT) province. NTT has nationally most districts (20 regions) accounted for water drought every year due to low water precipitation and lack of fresh water resource. It is investigated numerically using Engineering Equation Solver (EES) taking account for most major input considerations. The Solar thermal driven desalination is used to power MSF and MED. The Solar PV and WE are utilized separately for the source of energy for RO system. The results can be utilized as major consideration on which technology should be applied to tackle the fresh water supply drought in NTT. In addition, the economic analysis provides ample explanation for the economic feasibility on the project to be applied. Based on the investigation, the Solar Thermal powered MED and MSF promises biggest feasibility techno-economically with lowest LCOEs.

Keywords
renewable energy, desalination, indonesia, techno-economic, reverse osmosis

Topic
Renewable Energy

Link: https://ifory.id/abstract/g7eRE6TynQHp

Corresponding Author
Yeny Rachmawati

Institutions
Sebelas Maret University

Abstract
This study will conduct a study on the attitudes of hotel tourist to renewable energy especially solar PV for hotel accommodation in Surakarta, Indonesia. This research has been carried out in many countries in the world in involving community participation to consider new policies. This research is important to do to obtain valid information by directly involving community participation. This is good for government and hotels use in taking new policies on energy. This study uses a survey method with questionnaire research instrument and emphasizes the problem of responses (feedback) to obtain a broad explanation through the attitudes of hotel tourist to the application of renewable energy in Surakarta. This study uses a quantitative approach with descriptive statistical data analysis and simple random sampling by formula of Slovin to determine the number of samples from the population with an error rate of 5%. This research looks for 336 samples in star hotels from 1 to 5 stars in Surakarta hotels. Visitor attitudes in reducing energy consumption were 74%, visitor attitudes in recognizing RES failures were 40%, visitor attitudes in paying extra for RES installation were 35%, visitors perception of solar PV installation on the roof at 55%, and visitors perceptions of solar PV installation on balconies were 78%.

Keywords
Renewable energy; Solar PV; Tourist hotel accommodation.

Topic
Renewable Energy

Link: https://ifory.id/abstract/LPZRtfaJubrx

Corresponding Author
zahir masrul

Institutions
State University Of Malang

Abstract
Dye Sensitized Solar Cells (DSSC) based on TiO2 material are very potential because of several advantages such as high photostability, high thermal stability and very effective for Dye absorption. However, TiO2 still has limitation in terms of electron mobility. It needs to be composited with other materials for electron mobility. Material that has a potential is ZnO material. beside that ZnO also has the same band gap range as TiO2. In this condition, the composite system of TiO2-ZnO becomes more potential to be used as a DSSC electrode. In the Photosupercapacitor system, with a high source of electrical energy from DSSC, a Supercapacitor unit with sufficient capacitance is also needed. In this case, the selection of capacitor electrodes is very influential. In this study, electrodes based on the BaTiO3-PVDF composite system were used. With the dielectric permittivity reaching 1700, BaTiO3 material is the main candidate for the supercapacitor dielectric material. But BaTiO3 has limitations such as fragile and unflexible nature. This limitation can be overcome in combination with the PVDF polymer which has advantage in terms of its flexible properties. Besides that, the dielectric permittivity is the most optimal compared to other types of polymers. This study examined the effect of irradiation duration and light intensity on Photosupercapacitor performance. The results showed that the length of light irradiation, photoelectric current (Isc) of DSSC (photosupercapacitor system) and capacitance (C) of Supercapacitor (photosupercapacitor system) had an exponential relation. Characterization of light intensity on photoelectric current (Isc) and potential difference (Voc) of DSSC (Photosupercapacitor system) had a linear relation. The same result also shown in the characterization of light intensity on potential difference (Vc) and capacitance (C) of Supercapacitor (Photosupercapacitor System) which produced linear relations.

Keywords
DSSC-Supercapacitor, Photosupercapacitor, TiO2, ZnO, PVDF,BaTiO3, Capacitance.

Topic
Renewable Energy

Link: https://ifory.id/abstract/ACK7m3NPuGvf

Corresponding Author
Priyo Agus Setiawan

Institutions
Shipbuilding Institute of Polytechnic Surabaya, Jalan Teknik Kimia Kampus ITS Keputih-Sukolilo Surabaya, Indonesia, 60111
Mechanical Engineering Department, Sepuluh Nopember Institute of Technology, Mechanical Engineering Department, Kampus ITS Surabaya, Indonesia, 60111
Center of Excellence in Automotive Control & System, Sepuluh Nopember Institute of Technology, Surabaya, Indonesia, 60111

Abstract
The hydrokinetic turbine is one of the renewable energy without generating emission impacted on environmental. In this work, the numerical simulation is used to investigate the influence of discretization along the blade surface towards the amount of the torque coefficient and power coefficient. This work will be done on Savonius hydrokinetic turbine numerically by using the Myring formula for n equal with 1 having the performance better than the conventional blade. This work will compare the performance among the blade discretization. Firstly, the numerical will be done the validation with experimental results at TSR of 0.8 and velocity of fluid kept constant at 0.22 m/s. Problem-solving uses Unsteady RANS with moving mesh for the rotating body. The turbulence model uses the Realizable k-epsilon (RKE) enhanced wall treatment with the discretization varied 800 and 1600. The layer number is 20 layers by varying the first layer on the blade surface of 1 and 1.2. This work focuses to obtain the torque coefficient and power coefficient. The results indicate that the increase of discretization on the surface of the blade has improved the accuracy results of the turbine performance.

Keywords
Savonius hydrokinetic turbine, myring formula, discretization, Realizable k-epsilon, turbine performance

Topic
Renewable Energy

Link: https://ifory.id/abstract/TpjgzEbauRUh

Corresponding Author
Atika Sari Puspita Dewi

Institutions
1Department of Physics, Faculty of Mathematics and Natural Science, Universitas Negeri Malang. Jl. Semarang 5 Malang, 65145 Indonesia
2Centre of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Jl. Semarang 5, Malang 65145, Indonesia
3Department of Physics, Faculty of Mathematics and Natural Science, Universitas Airlangga. Jl. Semarang 5 Malang, 65145 Indonesia
4Department of Physics, Faculty of Science, National University of Singapore

*Corresponding Author : nandang.mufti.fmipa[at]um.ac.id

Abstract
Steam deposition techniques for fabricating CIGS (Copper Indium Gallium Diselenide) thin films require accurate environmental control and high costs, for which several alternative fabrication techniques have been developed. In this research the liquid phase method has been used with variations of decantation which will further affect the energy of the band produced. The CIGS film has been deposited on ITO (Indium Tin Oxide) substrate with doctor blade technique and XRD measurement which shows the resulting sample has a tetragonal crystal structure. SEM results show that the porosity of the film varies and the grain size of the CIGS increases with the number of decantation processes of oleylamine solvents. Band energy gap from CIGS decreases as oleylamin solvent decreases after the decantation process.

Keywords
CIGS, Doctor Blade, Decantation, Solar Cell

Topic
Renewable Energy

Link: https://ifory.id/abstract/fHhm7gK6nqLu

Corresponding Author
Muhammad Afnan Habibi

Institutions
(a) Universitas Negeri Malang
(b) Jacobs University

Abstract
Transformer had been widely used for supplying electric power to many motors, such as electric pumps, fans, or conveyors. The motor voltage may vary that is depending on its power and speed between one to another motor. The load needs the transformer which generate the proper voltage. Unfortunately, the working performance of transformer is decreasing because of its daily operation. In order to observe the working performance, the repetition of the transformer technical assessment is needed. This study provides the periodical inspection of high power transformer in maintenance and outage condition in the one of utility site in Indonesia. The checking activity maintains the eligible performance of the user device. The measurement of Sweep Frequency Response Analysis (SFRA) in the 5th unit had been done once in every six years. The measured result was obtained from 2007 until 2013. SFRA test diagnoses the characteristics of transformer winding and core by injecting low voltage at a certain frequency.

Keywords
SFRA, Transformer, Outage, Motor

Topic
Renewable Energy

Link: https://ifory.id/abstract/Dt6bfM2wunRa

Corresponding Author
Aloon EKo Widiono

Institutions
a) Department of Mechanical Engineering, State University of Malang, Semarang Street 5, Malang 65145, Indonesia
b) Centre of Advanced Materials for Renewable Energy, State University of Malang, Semarang Street 5, Malang 65145, Indonesia
c) Master Program of Mechanical Engineering, Graduate School, State University of Malang, Semarang Street 5, Malang 65145, East Java Indonesia
*sukarni.ft[at]um.ac.id

Abstract
Abstract. This study aims to determine the thermal characteristics of microalgae Tetraselmis chuii pyrolysis in the presence of TiO2 using thermogravimetric analysis. The algae sample was harvested after 8 days of culture on a lab scale from Jepara, Central Java, Indonesia. Meanwhile, TiO2 material that was measuring of 25 nm was obtained from Singapores SIGMA ALDRICH. The washing of the sample was done twice using distilled water, and then the algae were deposited until formed the gel. Afterward, the gel material was heated for 24 hours at 80 C to obtain a dry form. Then the dry material was broken by crusher to be a powder and then filtered on a mesh of 60. The final sample was achieved by combining 10 mg of microalgae with 0.03 mg of TiO2. To ensure the homogenius blend, the mechanically mixing process was performed by using a mortar, and subsequently, the last heating was occupied on the sample at a temperature of 80 C for 14 hours. Experiments were carried out on TG analyzer (Mettler Toledo TG DSC 1). Approximately (10.03 mg) of the sample is placed in an aluminum pan and then inserted into the chamber. The heating process was initiated at a temperature of 25 C, and constantly controlled by a computer at the rate of 10 C min until the completed temperature of 900 C. To prevent the oxidation during the thermal processes, nitrogen is chosen as a carrier gas with a flow rate of 50 ml min. From the TG experiments subsequently could be determined the mass loss of the sample during the escalation temperature and time; therefore, the thermal decomposition behavior of the material is possible to be specified. From this thermal characteristic, then the reaction kinetics, as well as thermodynamic parameters, are evaluated. By using a single heating rate, it is practicable to determine of Ea (Activation energy), A (Pre-exponential factor), and n (reaction order) using the model-fitting of Coats-Redfern. These results will be compared with the kinetic of the parent Tetraselmis chuii and will be immediately presented in the next paper.

Keywords
Thermal Characteristics, Tetraselmis chuii, Pyrolysis, Titanium dioxide

Topic
Renewable Energy

Link: https://ifory.id/abstract/BPqWMQCXtxYK

Corresponding Author
Nasruddin Junus

Institutions
Hasanuddin University

Abstract
Concrete began to use substitute materials to reduce the brittle nature. Substitution material is material that can replace concrete material both coarse aggregate, fine aggregate, and cement with other materials, such as Portland cement with steel slag, broken stone (coarse aggregate) with pumice and other stones. One of the benefits of the concrete material substitution method is that it can use organic waste. Organic waste can be in the form of residual production or usage, one of which is the candlenut shell which is a waste of candlenutThe candlenut shell is a new potential that can be developed and utilized even greater. Of course It can increase the economic value of the candlenut shell which has only been known as a waste material from the candlenut. The composition of the candlenut shells are CaO, SiO2, Al2O3, MgO, H2O, Fe2O3. When all reacts, there will be residual SiO2 that has not yet reacted to form a silica derivative reaction with CSH-2 gel resulting in a denser CSH-3 gel, which will increase the cement paste and aggregate. The purpose of this discussion is to determine the compressive strength value of candlenut shell concrete at 0% and 30% variation on the plates using Ultrasonic Pulse Velocity (UPV) at 28 days. The method used is experimental by testing samples / specimens in the form of reinforced plate size of 50cmx25cmx12cm with wet curing and dry curing methods with a variation in age of 28 days. Concrete compressive strength testing is done using UPV tools. The results of this discussion are the compressive strength of 30% candlenut shell variations on the application of the plate shows that the quality of the concrete produced in the wet curing reaches 18 MPa or equivalent to the quality of the K 225 concrete and the dry curing is only 14 MPa or equivalent to the quality of K175, while the variation Candlenut shells 0% (normal concrete) reach 28 MPa on wet curing and 24 MPa on dry curing. This shows that the plate with a variation of 30% candlenut shells are still able to achieve concrete quality II for use in structural work.

Keywords
UPV, Concrete, candelnut shell, compressive strength

Topic
Renewable Energy

Link: https://ifory.id/abstract/LWQGmtE2KMRD

Corresponding Author
Gamar Basuki

Institutions
Electronic Engineering Polytechnic Institute of Surabaya

Abstract
Induction motors are AC electric motors are the most widely used. Induction motor speed control can be done with some type of converter. However, not all types of converters can produce a great efficiency in terms of induction motor speed control. Matrix converter with venturini modultion may be a suitable option for the efficient speed control system with scalar control. Modulation switching of matrix converter was designed by Venturini. Therefore in this study MATLAB Simulink simulations to test the use modulation on matrix converter switching is Venturini method. Given this research is expected induction motor speed regulation can be more efficient in its application in the industrial world.

Keywords
Induction motor, matrix converter, Venturini modulation

Topic
Renewable Energy

Link: https://ifory.id/abstract/T4cEnHbpXhdg

Corresponding Author
Gamar Basuki

Institutions
Electronics Engineering Polytechnic Institute of Surabaya

Abstract
Induction motors are AC electric motors are the most widely used. Induction motor speed control can be done with some type of converter. However, not all types of converters can produce a great efficiency in terms of induction motor speed control. Matrix converter with venturini modultion may be a suitable option for the efficient speed control system with scalar control. Modulation switching of matrix converter was designed by Venturini. Therefore in this study MATLAB Simulink simulations to test the use modulation on matrix converter switching is Venturini method. Given this research is expected induction motor speed regulation can be more efficient in its application in the industrial world.

Keywords
Induction motor, matrix converter, Venturini modulation

Topic
Renewable Energy

Link: https://ifory.id/abstract/FCHumk64Bp2J

Corresponding Author
an afandi

Institutions
1) Electrical Engineering, Universitas Negeri Malang, Malang, Indonesia
2) Smart Power and Advanced Energy Systems Research Center, Batu, Indonesia
3) International Research Organization for Advanced Science and Technology, Kumamoto University, Kumamoto, Japan

a)Corresponding author: an.afandi[at]um.ac.id

Abstract
In general, aerodynamic barriers can be affected by wind gradients in wind flows. Besides, the wind speed will increase with increasing altitude above the ground. Flow near the surface encounters obstacles that can reduce wind speed. Technically, the reduction in speed close to the surface is a result of the function of surface roughness. In addition, the wind speed is very different for different types of terrain. However, this condition will also give random effects on the vertical and horizontal velocity components in the main flow direction, as discussed in these studies. These works are subjected to evaluate the wind gradient impact on the wind energy profile considering the ground launch in various levels. Specifically, wind gradients are modeled and approached by shifting vertical velocities which are designed in various exponential coefficients that refer to the type of surface. The results show that the gradient has a significant effect on changes in wind speed patterns that are in line with potential changes of the generated energy. The ground launch also leads to the energy profile as presented on the speed at the high.

Keywords
Energy Profile, Ground launch, Speed pattern, Wind Gradient

Topic
Renewable Energy

Link: https://ifory.id/abstract/uKRrfcyZwdmH