scholarly journals Policy Directions of Geothermal Potential at Sembalun District of East Lombok Regency in Nusa Tenggara Barat Province, Indonesia

2018 ◽  
Vol 2 (1) ◽  
pp. 71
Author(s):  
Antoni Wira Prana
Keyword(s):  
Geothermal Energy ◽  
Power Plants ◽  
Volcanic Rocks ◽  
Ground Surface ◽  
Secondary Data ◽  
Power Sources ◽  
Qualitative Research Design ◽  
Tourism Sector ◽  
Geothermal Potential ◽  
Modelling Analysis

This research attempted to study physical characteristics of geothermal and formulate policy directions of geothermal potential through the process of ISM (Interpretative Structural Modelling) analysis in Sembalun District of East Lombok Regency. This descriptive qualitative research design used observation, interview, and documentation for collecting the data. Two types of data were collected, namely primary and secondary data. The result of ISM analysis on the data found that the geology of Sembalun area is the remains of an old volcano which has gone through destruction process with today’s remains’ characteristics of rough, rocky and steep ground surface and 550-2250 masl height. The geomorphology of Sembalun is classified into three units, namely morphology of steep volcano, morphology of sloping volcanic hills, and morphology of denudational plains. Sloping volcanic hills stretch from the northwestern to the southwestern areas and some in the southeastern area as a part of protected forest and national park of Mount Rinjani. The slope is between 30-70 degrees and arranged by volcanic rocks. Policy directions of geothermal potential are 1) as geothermal power plants for power sources, 2) geothermal energy for crop drying, 3) geothermal energy for sterilization of planting media in the future, and 4) geothermal energy for tourism sector.

scholarly journals Analisa Geokimia Fluida Manifestasi Permukaan di Daerah Panas Bumi Lahendong

2020 ◽  
Vol 5 (1) ◽  
pp. 45
Author(s):  
Jeferson Polii ◽  
Alfrie Musa Rampengan
Keyword(s):  
Sulfuric Acid ◽  
Geothermal Energy ◽  
Hot Springs ◽  
Volcanic Rocks ◽  
North Sulawesi ◽  
Hot Air ◽  
Geothermal Potential ◽  
Acid Type ◽  
The Village ◽  
Plate Subduction

Geothermal energy depends on volcanic regions or plate subduction. Indonesia has geothermal potential due to the meeting of 3 (three) large plates. North Sulawesi is one of the areas located in the ring of fire. Some areas in the Minahasa Regency, North Sulawesi province, were targeted for research because they have manifestations of geothermal such as hot pools, steaming ground, mud pools, and other manifestations. The research location is divided into 3 (three) locations around the Lahendong geothermal area, namely the Lahendong pine forest, the Toraget hot air area, and the hot springs in the village of Totolan. The results of sample and ploting tests in ternary diagrams show that all three geothermal manifestations have sulfuric acid type fluids. This type of geothermal fluid has a high SO4 content, while HCO3 and Cl values ​​are low. Hot springs that have a type of sulfuric acid occur in active volcanic regions. This is supported by the lithology of three areas of manifestation which are composed of basalt resulting from volcanic rocks.

NMR contribution in sub-horizontal well for porosity-permeability heterogeneity characterization in limestones: implications for 3D reservoir prediction and flow simulation in a world class geothermal aquifer

2021 ◽  
Author(s):  
Maxime Catinat ◽  
Benjamin Brigaud ◽  
Marc Fleury ◽  
Miklos Antics ◽  
Pierre Ungemach ◽  
...  
Keyword(s):  
Geothermal Energy ◽  
Horizontal Well ◽  
Gamma Ray ◽  
Flow Simulation ◽  
High Density ◽  
Reservoir Prediction ◽  
Nmr Data ◽  
Geothermal Potential ◽  
Facies Associations ◽  
Deep Geothermal Energy

<p>With around 50 heating networks today operating, the aera around Paris is the European region which concentrates the most heating network production units in terms of deep geothermal energy. In France, the energy-climate strategy plans to produce 6.4TWh in 2023, compared to 1.5TWh produced in 2016. Despite an exceptional geothermal potential, the current average development rate of 70MWh/year will not allow this objective to be achieved, it would be necessary to reach a rate of 6 to 10 times higher. The optimization of the use of deep geothermal energy is a major challenge for France, and in Ile-de-France, which has a population of nearly 12 million inhabitants. This project aims to reconstruct and simulate heat flows in the Paris Basin using an innovative methodology (1) to characterize, predict and model the properties of reservoirs (facies, porosity, permeability) and (2) simulate future circulations and predict the performance at a given location (sedimentary basin) on its geothermal potential. This study focuses on a high density area of well infrastructures around Cachan, (8 doublets, 1 triplet in 56 km<sup>2</sup>). A new sub-horizontal doublet concept has been recently (2017) drilled at Cachan to enhance heat exchange in medium to low permeability formations. Nuclear Magnetic Resonance (NMR T2) logs have been recorded in the sub-horizontal well (GCAH2) providing information on pore size distribution and permeability. We integrated all logging data (gamma ray, density, resistivity, sonic, NRM T2) of the 19 wells in the area and 120 thin section observations from cuttings to derive a combined electrofacies-sedimentary facies description. A total of 10 facies is grouped into 5 facies associations coded in all the 19 wells according to depths and 10 3rd order stratigraphic sequences are recognized. The cell size of the 3D grid was set to 50 m x 50 m for the XY dimensions. The Z-size depends on the thickness of the sub-zones, averaging 5 m. The resulting 3D grid is composed of a total of nearly 8.10<sup>5</sup>cells. After upscaled, facies and stratigraphic surfaces are used to create a reliable model using the “Truncated Gaussian With Trends” algorithm. The petrophysical distribution “Gaussian Random Function Simulation” is used to populate the entire grid with properties, included 2000 NMR data, considering each facies independently. The best reservoir is mainly located in the shoal deposits oolitic grainstones with average porosity of 12.5% and permeability of 100 mD. Finally, hydrodynamic and thermal simulations have been performed using Pumaflow to give information on the potential risk of interference between the doublets in the area and advices are given in the well trajectory to optimize the connectivity and the lifetime of the system. NMR data, especially permeability, allow to greater improve the simulations, defining time probabilities of thermal breakthrough in an area of high density wells.</p>

scholarly journals Techno-Economic Simulation of a Geothermal Energy Generation System at the Machin Volcano in Colombia

2020 ◽  
Author(s):  
Hernando Enrique Rodriguez Pantano ◽  
Valentina Betancourt ◽  
Juan S. Solís-Chaves ◽  
C. M. Rocha-Osorio
Keyword(s):  
Geothermal Energy ◽  
Energy Generation ◽  
Generation System ◽  
Energy Potential ◽  
Public And Private ◽  
Mountain Ranges ◽  
Cost Of Energy ◽  
Geothermal Potential ◽  
Economic Simulation ◽  
Private Investors

Colombian geothermal potential for power generation is interesting due to the presence of the three Andean mountain ranges and the existence of active volcanoes in junction with springs and underground reservoirs with the consequent closeness of available hydrothermal water-wells. The Machin volcano is a small mountain placed in the middle of the country, that has a considerable geothermal potential with wells in a temperature range of 160 to 260C. For that reason, a techno-economic simulation for a Geothermal Energy Generation System is proposed in this paper, using for that the System Advisor Model software. The purpose of this research is to present a more encouraging picture for public and private investors interested in exploiting this energy potential in Colombia. Simulation results include technical and economic aspects as annual and monthly energy production, geothermal resource monthly average temperature, and the Time Of Delivery Factors are also considered. Some tables with system configuration, plant and pump costs, Capacity Factor, and real and nominal Levelized Cost of Energy are also shown.

scholarly journals STRATEGI PEMERINTAH DAERAH DALAM MENINGKATKAN PENDAPATAN ASLI DAERAH (PAD) MELALUI PENGEMBANGAN POTENSI PARIWISATA KABUPATEN MANGGARAI BARAT

2018 ◽  
Vol 3 (1) ◽  
pp. 75
Author(s):  
Rosmiati Rosmiati ◽  
Trisakti Handayani ◽  
Rohmad Widodo
Keyword(s):  
Qualitative Research ◽  
Local Government ◽  
Human Resource ◽  
Field Development ◽  
Qualitative Research Design ◽  
Resource Limited ◽  
Tourism Sector ◽  
Aware Group ◽  
Quality Of Products

ABSTRAKPemerintah Kabupaten Manggarai Barat mempunyai peran penting dalam memajukan daerahnya, salah satunya dengan mengembangkan potensi yang ada. Dengan mengoptimalkan potensi yang ada di Manggarai Barat, khususnya dari sektor pariwisata agar bisa meningkatkan Pendapatan Daerah. Penelitian ini bertujuan untuk : (1) Mendeskripsikan upaya pengembangan potensi pariwisata dalam meningkatkan Pendapatan Asli Daerah, (2) Menganalisis kendala yang dihadapi Pemerintah Daerah dalam pengembangan potensi pariwisata, (3) Menjelaskan solusi yang dilakukan Pemerintah Daerah dan mengatasi kendala. Penelitian ini menggunakan teknik penelitian deskriptif kualitatif. Pengumpulan data diperoleh dengan teknik observasi, wawancara dan dokumentasi. Adapun informan yang digali informasinya adalah sekretaris dinas kebudayaandan pariwisata, kepala bidang pengembangan, kepala bidang promosi, pemandu wisata dan pengunjung wisata di Kabupaten Manggarai Barat. Berdasarkan penelitian diperoleh hasil sebagai berikut:(1) Strategi Pemerintah Daerah untuk meningkatkan Pendapatan Asli Daerah melalui pengembangan potensi pariwisata telah dilakukan dan dimasukan dalam Renstra, namun belum begitu maksimal, (2) Kendalanya yaitu: faktor masyarakat, kurangnya kualitas SDM, anggaran dana terbatas, belum optimalnya sarana dan prasarana, kurangnya kerjasama, ketatnya persaingan pasar dan masih belum tersedianya sarana promosi. (3) Solusinya yaitu mengadakan pokdarwis, meningkatkan kualitas SDM, mengoptimalkan pengeluaran maupun pemasukan dana, peningkatan sarana dan prasarana, meningkatkan koordinasi antar dinas, peningkatan kualitas produk, mengoptimalkan sarana promosi.Kata Kunci : Strategi, Pemerintah Daerah, Potensi Pariwisata.ABSTRACTFurthermore, the local government of West Manggarai holds the crucial role indeveloping the region by means of optimizing the existing potentialities. In accordance with the societal perception regarding the condition of eastern regions of Indonesia that are categorized as underdeveloped regions, it is of requirement for local government to alternate such paradigm. It might be by optimizing the potentialities that entail West Manggarai, particularly on tourism sector, in addition to increase the revenue. Therefore this research was intended to: (1) describe the efforts of developing the tourism potentiality in developing the locally-generated revenue in West Manggarai; (2) analyze the barriers faced by the local government in developing the tourism potentiality; (3) formulate the possible solutions for local government to overcome the barriers. Moreover, this research accommodated descriptively qualitative research design in whichthis research was to systematically and conscientiously provide a vision of actual facts and characteristics of particular population. In addition, it aimed to solve the actual issues and collect the data. Furthermore, the data were originally collected from observation, interview, and documentation. In fact, the informants recruited included the secretary of Department of Tourism and Culture, the head of field development tour-guide (1 person), and tourist (1 person) of West Manggarai. Alluding to the research that had been piloted,there were some results as being explicated as follows: (1) the strategies of localgovernment in developing the revenue by means of developing the tourism potentiality had been implemented and inserted into the strategic plan, but they had not been maximally successful yet; (2) the barriers faced in developing the tourism potentiality comprised societal factor, lack of quality regarding human resource, limited budgets, ineffectiveness of supporting facilities, lack of collaboration with private parties, the sharp competition ofmarket, and the unobtainability of tourism promotion facilities, such as websites; and (3) the possible solutions to overcome the barriers were by: establishing aware group of tourism, upgrading the quality of human resource, optimizing the expenditures and revenues, developing the supporting facilities, strengthening the coordination of each department, upgrading the quality of products, and optimizing the promotion facilities.Keywords: The Strategies, Local Government, Tourism Potentiality.

scholarly journals The concept of an early warning system for the use of nuclear technology in Indonesia

2021 ◽  
Vol 331 ◽  
pp. 04003
Author(s):  
Dewi Prima Meiliasari ◽  
Berton Suar Panjaitan ◽  
Toto Heryanto ◽  
Wilopo
Keyword(s):  
Early Warning ◽  
Early Warning System ◽  
Nuclear Power ◽  
Power Plants ◽  
Information Dissemination ◽  
Warning System ◽  
Secondary Data ◽  
Potential Threat ◽  
Nuclear Disaster ◽  
Warning Services

The application of nuclear power plants in the world is increasing and has the potential for accidents, including nuclear weapons tests from outside the Nuclear Non-Proliferation Treaty, thus allowing radioactive releases to fall into Indonesian territory, which is a potential threat. Indonesia also utilizes nuclear power in many fields, thus also potentially becoming a national threat. To prevent the threat of radiation potential requires a nuclear disaster Early Warning System (EWS) that can be accessed by the community. This research analysed the EWS that Indonesia needed, using qualitative methods by describing the results of research obtained from interviews and secondary data. Results and research discussions starting from observation and monitoring of radiation exposure, warning services, information dissemination, and supported by countermeasures for the effectiveness of the EWS. The results showed that the development of an integrated nuclear disaster EWS that is easily accessible to the community quickly and continuously under the development of an emergency is a strategy as a decision to reduce the risk of nuclear disaster. The development of the strategy requires a legal basis that regulates coordination between ministries/institutions, from planning to information dissemination to ensure the safety of the public and Indonesian people's security.

scholarly journals A Project To Estimate The Power Capacity Of Geothermal Power Plants Based On The Enthalpy Of Geothermal Fluid And Plant Design

2021 ◽  
Author(s):  
Obumneme Oken
Keyword(s):  
Power Plant ◽  
Geothermal Energy ◽  
Electricity Generation ◽  
Power Plants ◽  
Hot Water ◽  
Power Capacity ◽  
Geothermal Fluid ◽  
Direct Heating ◽  
Single Flash ◽  
Geothermal Power

Nigeria has some surface phenomena that indicate the presence of viable geothermal energy. None of these locations have been explored extensively to determine the feasibility of sustainable geothermal energy development for electricity generation or direct heating. In this context, the present study aims to provide insight into the energy potential of such development based on the enthalpy estimation of geothermal reservoirs. This particular project was conducted to determine the amount of energy that can be gotten from a geothermal reservoir for electricity generation and direct heating based on the estimated enthalpy of the geothermal fluid. The process route chosen for this project is the single-flash geothermal power plant because of the temperature (180℃) and unique property of the geothermal fluid (a mixture of hot water and steam that exists as a liquid under high pressure). The Ikogosi warm spring in Ekiti State, Nigeria was chosen as the site location for this power plant. To support food security efforts in Africa, this project proposes the cascading of a hot water stream from the flash tank to serve direct heat purposes in agriculture for food preservation, before re-injection to the reservoir. The flowrate of the geothermal fluid to the flash separator was chosen as 3125 tonnes/hr. The power output from a single well using a single flash geothermal plant was evaluated to be 11.3 MW*. This result was obtained by applying basic thermodynamic principles, including material balance, energy balance, and enthalpy calculations. This particular project is a prelude to a robust model that will accurately determine the power capacity of geothermal power plants based on the enthalpy of fluid and different plant designs.

scholarly journals Kontribusi Jumlah Pengunjung Obyek Wisata Dataran Tinggi Dieng Bagi Pendapatan Asli Daerah Kabupaten Wonosobo

2019 ◽  
Vol 2 (2) ◽  
pp. 26-33
Author(s):  
Andryan Setyadharma ◽  
Adi Kurniawan Sujatmiko
Keyword(s):  
Price Index ◽  
Statistical Tests ◽  
Consumer Price Index ◽  
Secondary Data ◽  
Variable Number ◽  
Analytical Tool ◽  
Short Term ◽  
The Real ◽  
Local Revenue ◽  
Tourism Sector

increasing regional revenue. For a region with limited potential of its’ natural resources it will be a challenge in an attempt to maximize the potential of the region. One of the effort to maximize the regional revenue is by optimizing potential in the tourism sector. Types of data in this research are secondary data such as tourist numbers, consumer price index, General Allocation Grant, and Local Revenue of Wonosobo Regency. The analytical tool is multiple regression analysis with statistical tests and classical assumption. This research aimed to understand the effect of the number of visits tourist, consumer price index, and General Allocation Grant against the Local Revenue of Wonosobo Regency from 2015 to 2017. The results of the regression processing of short-term models show that the consumer price index variable has a significant effect on Regional Original Income with a probability value of 0.0090 smaller than the real level α = 5%. While the variable number of visitors and General Allocation Funds did not have a significant effect on Regional Original Income with a probability value greater than the real level α = 5%.

scholarly journals Design Considerations for the Liquid Air Energy Storage System Integrated to Nuclear Steam Cycle

2021 ◽  
Vol 11 (18) ◽  
pp. 8484
Author(s):  
Seok-Ho Song ◽  
Jin-Young Heo ◽  
Jeong-Ik Lee
Keyword(s):  
Renewable Energy ◽  
Energy Storage ◽  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Power Plants ◽  
Renewable Energy Sources ◽  
Storage System ◽  
Energy Storage System ◽  
Power Sources

A nuclear power plant is one of the power sources that shares a large portion of base-load. However, as the proportion of renewable energy increases, nuclear power plants will be required to generate power more flexibly due to the intermittency of the renewable energy sources. This paper reviews a layout thermally integrating the liquid air energy storage system with a nuclear power plant. To evaluate the performance realistically while optimizing the layout, operating nuclear power plant conditions are used. After revisiting the analysis, the optimized performance of the proposed system is predicted to achieve 59.96% of the round-trip efficiency. However, it is further shown that external environmental conditions could deteriorate the performance. For the design of liquid air energy storage-nuclear power plant integrated systems, both the steam properties of the linked plants and external factors should be considered.

The CFD Design and Optimisation of a 100 kW Hydrogen Fuelled mGT

2020 ◽  
Author(s):  
Cedric Devriese ◽  
Gijs Penninx ◽  
Guido de Ruiter ◽  
Rob Bastiaans ◽  
Ward De Paepe
Keyword(s):  
Combustion Chamber ◽  
Power Plants ◽  
Internal Combustion Engines ◽  
Cone Angle ◽  
Electricity Production ◽  
Design Parameters ◽  
Inlet Temperature ◽  
Large Power ◽  
Power Sources ◽  
The Impact

Abstract Against the background of a growing deployment of renewable electricity production, like wind and solar, the demand for energy storage will only increase. One of the most promising ways to cover the medium to long-term storage is to use the excess electricity to produce hydrogen via electrolysis. In a modern energy grid, filled with intermittent power sources and ever-increasing problems to construct large power plants in densely populated areas, a network of Decentralised Energy Systems (DES) seems more logical. Therefore, the importance of research into the design of a small to medium-sized hydrogen fuelled micro Gas Turbine (mGT) unit for efficient, local heat and electricity production becomes apparent. To be able to compete with Reciprocating Internal Combustion Engines (RICEs), the mGT needs to reach 40% electrical efficiency. To do so, there are two main challenges; the design of an ultra-low NOX hydrogen combustor and a high Turbine Inlet Temperature (TIT) radial turbine. In this paper, we report on the progress of our work towards that goal. First, an improvement of the initial single-nozzle swirler (swozzle) combustor geometry was abandoned in favour of a full CFD (steady RANS) design and optimisation of a micromix type combustion chamber, due to its advantages towards NOx-emission reduction. Second, a full CFD design and optimisation of the compressor and turbine is performed. The improved micromix combustor geometry resulted in a NOx level reduction of more than 1 order of magnitude compared to our previous swozzle design (from 1400 ppm to 250 ppm). Moreover, several design parameters, such as the position and diameter of the hydrogen injection nozzle and the Air Guiding Panel (AGP) height, have been optimized to improve the flow patterns. Next to the combustion chamber, CFD simulations of the compressor and turbine matched the 1D performance calculations and reached the desired performance goals. A CFD analysis of the impact of the tip gap and exhaust diffuser cone angle led to a choice of these parameters that improved the compressor and turbine performance with a limited loss in efficiency.

Covid-19 Pandemic and Severity of Economic Impacts: The Indonesian Case

2021 ◽  
pp. 1-15
Author(s):  
Tulus Tahi Hamonangan Tambunan
Keyword(s):  
Economic Growth ◽  
Raw Materials ◽  
Secondary Data ◽  
Direct Consequence ◽  
Analysis Data ◽  
Poor People ◽  
National Bureau ◽  
Tourism Sector ◽  
Food And Beverage ◽  
Negative Shock

This study tends to examine the impacts of the Covid-19 pandemic on the Indonesian economy with the focus on economic growth, poverty, income distribution, unemployment, tourism sector, and businesses. More specifically, this study tries to answer the following two questions. First, how serious has been the negative shock of the Covid-19 pandemic on the Indonesian economy, especially on economic growth, employment, wages, poverty, inequality, tourism activities and businesses? Second, what were the main economic transmission channels through which the Covid-19 pandemic have caused that negative shock? It adopted an exploratory methodology with a comprehensive review of available literature, including policy documents, research papers, and reports and secondary data analysis. Data used was from the National Bureau of Statistics (BPS). It reveals that the Covid-19 pandemic has affected the Indonesian economy through four main channels: (i) declined domestic demand as a direct consequence of the "anti-Covid-19 impact" policy; (ii) declined export; (iii) declined imports of processed raw materials and auxiliary materials; and (iv) increased poor people as many employees have been laid off, or their wages were cut. As a result, the country's economy experienced a growth contraction of 2.07 percent, the number of foreign tourists visited Indonesia dropped significantly, the unemployment rate as well as the percentage of poor people increased, the Gini ratio experienced an increase, and many companies have suffered huge losses, especially in the tourism sector and also those whose businesses were very dependent on this sector such as transportation and food and beverage companies, as well as hotels and other accommodation provider companies.

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