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Hasil Pencarian

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Felix Pratama
"ABSTRAK
Tujuan dari penelitian ini adalah untuk melakukan simulasi dan optimisasi berdasarkan energi dan eksergi dari kepala sumur ke pembangkit listrik and membandingkan apakah analisis berdasarkan energi dan eksergi memberikan hasil yang sama. Perubahan kondisi fluida panas bumi yang mengalir dari kepala sumur ke pembangkit listrik melalui perpipaan diperhitungkan. Siklus flash-binary diajukan sebagai siklus pembangkit listrik dengan Organic Rankine Cycle (ORC) sebagai siklus binary. Beberapa kombinasi campuran zeotropik digunakan sebagai fluida kerja ORC. Siklus yang diajukan dibandingkan dengan siklus yang sudah ada di Sibayak, yakni siklus single flash, dari segi ekonomi dan performa termodinamika. Sumur panas bumi disimulasikan menggunakan WellSim, sementara perpipaan dan pembangkit listrik disimulasikan menggunakan UniSim Design. Hasil simulasi yang diperoleh dioptimisasi dengan metode Genetic Algorithm (GA) di MATLAB untuk memaksimumkan Net Present Value (NPV) dan meminimumkan Levelized Cost per Unit Exergy of Overall System . Analisis parametrik dilakukan untuk menguji pengaruh tekanan kepala sumur, tekanan separator, dan komposisi fluida kerja terhadap fungsi objektif. Sebagai perbandingan antara ekonomi dan performa termodinamika, optimisasi untuk memaksimumkan produksi listrik dan efisiensi eksergi dilakukan. Optimisasi NPV dan memberikan hasil yang sama di mana siklus flash-binary dengan R601 murni sebagai fluida kerja ORC adalah siklus yang paling ekonomis. Dari performa termodinamika, campuran zeotropik sebagai fluida kerja ORC menghasilkan produksi listrik dan efisiensi eksergi yang maksimum. Hasil optimisasi menunjukkan bahwa sistem yang paling ekonomis tidak dapat memperoleh sistem dengan performa termodinamika terbaik dan berlaku sebaliknya. Penggunaan ORC sebagai bottoming cycle siklus single flash memberikan NPV yang lebih tinggi dan yang lebih rendah dibandingkan siklus single flash, Selain itu, penggunaan ORC dapat mengurangi kehilangan eksergi oleh brine dari 30,65 menjadi 17,85 dari total eksergi yang masuk ke sistem. Efisiensi energi dan eksergi dari pembangkit listrik juga meningkat masing-masing dari 8,47 menjadi 10,05 dan 33,37 menjadi 39,60. Hasil analisis merekomendasikan siklus flash-binary untuk pembangkit listrik di Sibayak.

ABSTRACT
The purposes of this research are to conduct simulation and optimization based on energy and exergy from wellhead to power plant and compare whether analysis based on energy and exergy give the same results. Changes of geothermal fluid condition that transmitted from wellhead to power plant by pipelines are also considered. A flash-binary cycle is proposed as geothermal power plant cycle with organic Rankine cycle (ORC) as the binary cycle. Various combinations of zeotropic mixtures are used as ORCs working fluid. The proposed cycle is compared to existing cycle in Sibayak, that is single flash cycle, from economic and thermodynamic performance. The geothermal wells are simulated using WellSim, while the pipelines and power plant are simulated using UniSim Design. The obtained results are optimized with Genetic Algorithm (GA) method in MATLAB for maximizing Net Present Value (NPV) and minimizing Levelized Cost per Unit Exergy of Overall System . Parametric analysis is performed to examine the effects of wellhead pressure, separator pressure, and working fluid composition on the objective function. As a comparison between economic and thermodynamic performance, optimization to maximize net power output and exergy efficiency are also conducted. The NPV and optimizations give a same result where a flash-binary cycle with pure R601 as ORCs working fluid is the most economic cycle. From thermodynamic performace, zeotropic mixtures as ORCs working fluid give maximum net power output and exergy efficiency. Optimization results implied that the most economically effective system cant obtain the best system thermodynamic performance and vice versa. Utilization of ORC as bottoming cycle of single flash cycle gives higher NPV and lower compared to single flash cycle. Moreover, utilization of ORC can reduce exergy loss caused by brine from 30,65 to 17,85 of overall exergy input. The energy and exergy efficiency of power plant is also increased from 8,47 to 10,05 and 33,37 to 39,60, respectively. The results of analysis recommend a flash-binary cycle for Sibayak power plant.
"
2019
S-pdf
UI - Skripsi Membership  Universitas Indonesia Library
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Arief Surachman
"Dalam rangka upaya memenuhi target pemerintah yaitu pengembangan pembangkit listrik tenaga panas bumi PLTP pada tahun 2025 ditargetkan sebesar 7.242 MW, maka tentu saja akan diperlukan data tentang desain PLTP yang paling optimal yang dapat diterapkan pada seluruh kondisi sumber panas bumi. Dengan demikian, diperlukan panduan desain yang dibuktikan secara ilmiah untuk pembangunan PLTP. Dalam dekade terakhir ini, banyak peneliti yang menganalis atau merancang sistem energi dengan menggabungkan antara analisis energi, exergy dan thermoekonomik. Hal ini dimaksudkan dalam upaya peningkatan efisiensi serta mengurangi kerugian-kerugian yang ditimbulkan oleh ketidakefisienan sistem.
Melalui analisa yang komprehensif dengan menggabungkan analisa energi, exergy, exergoeconomics serta exergoenvironment, maka diharapkan dapat menjadi panduan desain yang paling optimum dengan mempertimbangkan segala aspek, baik aspek teknologi, ekonomi dan lingkungan yang dapat diaplikasikan untuk berbagai kondisi sumber panas bumi di Indonesia. Untuk itulah pada disertasi ini dilakukan analisa dan optimasi 3E exergy,economic,environment. Pemodelan dan optimasi sistem PLTP dilakukan menggunakan software EES dan diintegrasikan dengan MATLAB.
Dari hasil analisis 3E, dapat diketahui bahwa komponen seperti turbin dan cooling tower merupakan komponen yang menyumbang nilai exergy destruction, total cost dan exergoenvironment yang paling besar dibandingkan komponen lainnya.

In order to reach the government 39;s target of building geothermal power plant PLTP in 2025 of 7,242 MW, then it will need data about the most optimal PLTP design that can be applied to all geothermal conditions. Thus, the design required for the construction of PLTP. In the last decade, many researchers have analyzed and discussed energy systems with energy, exergy and thermoeconomic analyzes. This is necessary in an effort to increase and reduce the losses caused by system inefficiencies.
Through a comprehensive analysis with energy analysis, exergy, exergoeconomics and exergoenvironment, it is expected to be the most optimal design with good aspects, economics and environment that can be used for various geothermal conditions in Indonesia. For analysis, it was conducted 3E exergy, economy, environment analysis on this dissertation. By using EES software and integrated with MATLAB, the PLTP system can be modeled and optimized.
From the results of 3E analysis, it can be seen that components such as turbines and cooling towers are the components that contribute the largest value of total exergy destruction, total cost and exergoenvironment compared to other components.
"
Depok: Fakultas Teknik Universitas Indonesia, 2018
D2483
UI - Disertasi Membership  Universitas Indonesia Library
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Septian Khairul Masdi
"Pada penelitian ini dilakukan lima jenis analisis pada PLTP Kamojang Unit 4, antara lain analisis exergy pada kondisi operasional, optimasi efisiensi exergy, optimasi ekonomi, optimasi exergoeconomic dengan tekanan wellhead sebagai variabel, dan optimasi steam ejector dengan aliran motive steam sebagai variabel. Perhitungan dilakukan dengan bantuan MATLAB. Karakteristik termodinamika uap panas bumi diasumsikan sama dengan karakteristik air yang didapatkan dari REFPROP. Tekanan wellhead 10 bar saat ini menghasilkan efisiensi exergy 31,91%. Optimasi efisiensi exergy menghasilkan tekanan wellhead 5,06 bar, efisiensi exergy 47,3%, dan biaya sistem US $3.957.100. Optimasi ekonomi menghasilkan tekanan wellhead 11 bar, efisiensi exergy 22,13%, dan biaya sistem US $2.242.200. Optimasi exergoeconomic menghasilkan 15 titik optimum. Optimasi steam ejector menghasilkan aliran motive steam 34,41 𝑘𝑔 𝑠 lebih kecil dari aliran operasional saat ini 40,61 𝑘𝑔 𝑠.

This study presents five analysis at Unit 4 Kamojang Geothermal Power Plant are exergy analysis at operational condition, exergy efficiency optimization, economic optimization, exergoeconomic optimization with wellhead pressure as a variable, and steam ejector optimization with mass flow of motive steam as a variable. Calculations are conducted by using the MATLAB. Thermodynamics characteristic of geothermal fluid assumed as water characteristic which get from REFPROP. Wellhead pressure operational condition 10 bar has exergy efficiency 31.91%. Exergy efficiency optimization has wellhead pressure 5.06 bar, exergy efficiency 47.3%, and system cost US$ 3,957,100. Economic optimization has well pressure 11 bar, exergy efficiency 22.13%, and system cost US$ 2,242,200. Exergoeconomic optimization has 15 optimum condition. Steam ejector optimization has mass flow of motive steam 34.41 𝑘𝑔 𝑠 smaller than the operational condition 40.61 𝑘𝑔 𝑠."
Depok: Fakultas Teknik Universitas Indonesia, 2014
S56473
UI - Skripsi Membership  Universitas Indonesia Library
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Panjaitan, Mangasi Natanael
"Potensi geotermal Indonesia mencapai sekitar 28,1 GWe, dan sebagian besar terdapat di Sumatra. Akan tetapi, kondisi infrastruktur saluran transmisi di Sumatra yang belum memadai tidak memungkinkan pemanfaatkan PLTP demi penyediaan listrik penduduk. Lalu, Peraturan Pemerintah nomor 1 tahun 2014 tentang Pelaksanaan Kegiatan Pertambangan Mineral dan Batubara (minerba) menuntut pembangunan smelter (suatu industri dengan konsumsi energi yang sangat besar) harus segera terealisasikan. Melihat keadaan ini, potensi geotermal dapat dimanfaatkan sebagai salah satu alternatif untuk memenuhi kebutuhan energi industri smelter, yakni dengan membangun PLTP yang terintegrasi langsung dengan smelter. Jenis smelter yang paling cocok adalah smelter aluminium karena jenis smelter tersebut dominan menggunakan proses elektrolisis. Tetapi selama proses, terdapat losses yang mempengaruhi efisiensi masing-masing sistem. Suatu analisis diperlukan untuk mengidentifikasi posisi-posisi dan alasan terbentuknya losses tersebut. Metode yang digunakan untuk menganalisis kedua sistem PLTP dan Smelter pada penelitian ini adalah metode analisis energi dan eksergi berdasarkan pada Hukum Termodinamika I dan II. Tujuan dari penelitian ini adalah mendapatkan hasil perhitungan energi dan eksergi untuk mengetahui efisiensi smelter dan pembangkit siklus single-flash sehingga selanjutnya dapat dianalisis untuk merekomendasikan perbaikan sistem agar efisiensi termal PLTP sebagai pemasok listrik dan efisiensi eksergi dari sistem smelter Aluminium dapat meningkat. Hasil penelitian menunjukkan bahwa Siklus geotermal Single-flash memiliki efisiensi eksergi sebesar 31%, dengan exergy losses terbesar terjadi pada kondensor (233.58 MJ) dan reinjeksi brine (176.85 MJ) dan Smelter Aluminium memiliki efisiensi sebesar 18.45%, dengan exergy losses terbesar terjadi pada Digester (35.69 MJ), Rotary kiln (31.05 MJ), dan elektrolisis cell (79.25 MJ).

The geothermal energy potential in Indonesia is around 28.1 GWe, where a large portion of it is in Sumatra. However, since the transmission line infrastructure in Sumatra isn?t capable to transfer this energy, utilization to provide electricity for the citizen is not possible. On the other hand, PP No.1 of year 2014, regarding Minerals and Coals Mining, demands smelter industries (industries with a massive amount of energy consumption) to be immediately built in Indonesia. Considering this situation, the geothermal energy potential can be used as an alternative to provide the need of energy of smelter industries, by building a geothermal power plant which is integrated with the smelter. An aluminum smelter is most suitable because it mainly uses electrolysis process. However, during the process, some losses occurs in each system. An analysis is needed to indentify the location where these losses occurs and their explanation. The method used to analyze both systems is an energy and exergy analysis based on First and Second Law of Thermodynamics. The purpose of this research is to obtain the calculation of energy and exergy to find out the efficiency of both smelter and single-flash cycle power plant, so it can be analyzed to give recommendations that can fix the model of single-flash cycle geothermal power plant and aluminum smelter to increase their thermal efficiency and performance. The result of this research shows that Single-flash cycle Geothermal Plant has an exergy efficiency of 31%, with largest exergy losses occurring at condenser(233.58 MJ) and brine reinjection (176.85 MJ) and Aluminum Smelter has an exergy efficiency of 18.45%, with largest exergy losses occurring at Digester (35.69 MJ), Rotary kiln (31.05 MJ), and electrolysis cell (79.25 MJ)"
Depok: Fakultas Teknik Universitas Indonesia, 2016
S61962
UI - Skripsi Membership  Universitas Indonesia Library
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Situmorang, Susanto Berlin Manarua
"Penelitian ini berfokus pada analisis dari konstruksi Pembangkit Listrik Tenaga Panas Bumi di Wilayah Kerja Panas Bumi WKP Tulehu. Salah satu sumur yang telah diuji di WKP Tulehu memproduksi fluida panas bumi dengan karakteristik low-medium enthalpy 130-165oC, low wellhead pressure 300-700 kPa, dan low mass flow rate 16,67-25 kg/s, dimana karakteristik tersebut sangat sesuai untuk diutilisasi dengan tipe binary power plant. Pembangkit listrik binary secara umum terdiri atas dua tipe Organic Rankine Cycle,yang menggunakan hidrokarbon sebagai fluida kerja, dan Kalina Cycle System, yang menggunakan campuran ammonia-air sebagai fluida kerja. Penelitian ini akan berfokus pada optimasi multiobjektif terhadap tipe pembangkit listrik binary yang paling sesuai dengan kondisi fluida panas bumi tersebut. Objektif yang akan dimasukkan dalam optimasi ini adalah Exergy Destruction dan Purchased Equipment Cost. Hasil optimasi tersebut kemudian akan digunakan sebagai basis untuk kalkulasi estimasi biaya proyek pembangkit listrik yang dicanangkan. Dengan begitu akan diperoleh tipe pembangkit listrik binary yang paling sesuai untuk digunakan di WKP tersebut. Simulasi dan optimasi dilakukan dengan menggunakan Matlab dan Engineering Equation Solver EES .

This study focuses on simulation and optimization of the binary cycle power plant on Tulehu Geothermal Field. One of the tested well in the field produces geothermal fluid with characteristics such as low to medium temperature 130 165oC, low wellhead pressure 3-7 bar, and low mass flow rate 16,67 ndash 25 kg s, in which those characteristics are suitable for binary cycle power plant. Binary power plant can be categorized into two types, Organic Rankine Cycle, which uses hydrocarbon as its working fluid, and Rankine Cycle System, which uses ammonia water mixture as its working fluid. The study will mainly focuses on the optimization of the types of binary power plant with multiobjectives. Those objectives which will be included are Exergy Destruction and Purchased Equipment Cost. The results then will be used as basis for the estimation of the power plant project total cost. By using those method we will be able to find out the solution to which one of the types that have the best output for possible later use on the geothermal field. The simulation and optimization will be conducted by using Matlab and Engineering Equation Software EES."
Depok: Fakultas Teknik Universitas Indonesia, 2018
S-pdf
UI - Skripsi Membership  Universitas Indonesia Library
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Ahmad Luthfi Fitris
"Fluida panas bumi dari pembangkit listrik tenaga panas bumi (PLTP) selalu disertai oleh gas yang tidak dapat dikondensasikan/Noncondensable gas (NCG). Gas-gas ini meningkatkan tekanan kondensor, berkontribusi terhadap backpressure pada turbin, dan mengurangi produksi daya pembangkit. Untuk menghilangkan NCG dari kondenser, PLTP membutuhkan utilisasi dan optimisasi Gas Removal System (GRS). PT. X menggunakan sistem dual ejector (SJE) untuk gas removal system (GRS). Karena berbagai kondisi uap, banyak motive steam yang digunakan dan tekanan kondenser meningkat. Hal ini menyebabkan penuruan produksi daya. Namun, pembangkit PT. X memiliki liquid ring vacuum pump (LRVP) yang dapat digunakan dengan dual ejector sebagai sistem hibrida (hybrid system). Pembahasan ini bertujuan untuk optimisasi GRS dengan tujuan peningkatan produksi listrik dan didasarkan pada analisis termodinamika dan Cycle Tempo 5.0.
Hasil menunjukkan bahwa hybrid system memiliki kinerja yang lebih tinggi daripada sistem dual ejector. Dengan mempertahankan tekanan kondenser yang sama pada 0,08 bar, PLTP dengan sistem dual ejector menghasilkan daya bersih sebesar 42,9 MW sedangkan PLTP dengan hyrbid system menghasilkan daya bersih sebesar 44,5 MW. Kesimpulannya, analisis termodinamika menunjukkan bahwa hybrid system lebih cocok untuk digunakan di PT. X demi peningkatan produksi daya.

Geothermal fluids of geothermal power plants (GPP) are always accompanied by non-condensable gases (NCG). These gases do not condense inside the condenser which will increase the condenser pressure, contribute to backpressure on the turbine, and thereby decreasing the power generation of the plant. In order to remove these NCG from the condenser, GPP would need to utilize and optimize Gas Removal System (GRS). Currently PT. X utilizes a dual ejector gas removal system (GRS). Due to various steam conditions, more motive steam is needed and the condensers pressure rises up. These problems will eventually lead to lower power production. However, the GPP possesses a liquid ring vacuum pump on standby which could be utilized with the ejector as a hybrid system. This study aims to optimize the gas removal system for an improved GPPs overall power production that is based on thermodynamic analysis and uses Cycle Tempo 5.0 for modeling and simulation.
The result shows that hybrid system has higher performance than the dual ejector system. By maintaining the same condenser pressure at 0.08 bar, the GPP with dual ejector system produces nett power of 42.9 MW while the GPP with hybrid system produces nett power of 44.5 MW. In conclusion, the thermodynamic analysis justifies that hybrid gas removal system is more suitable to be utilized in PT. X in order to gain higher power producion.
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Depok: Fakultas Teknik Universitas Indonesia, 2018
S-Pdf
UI - Skripsi Membership  Universitas Indonesia Library
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Mohamad Ilman Hasya
"Seperti yang diketahui pemerintah Indonesia saat ini sedang menjalankan program 35000 watt, dimana dalam hal ini untuk memenuhi banyak permintaaan akan ketersediaan listrik yang ada di seluruh Indonesia. Karena sampai dengan saat ini berrdasarkan data yang ada jumlah perrmintaan akan listrik yang dibutuhkan masih melebihi jumlah pembangkit yang ada di seluruh Indonesia. Oleh karena itu pemerintah menjalankan program 35000 watt dengan harapan dapat memenuhi kebutuhan listrik yang diminta.
Dalam hal ini diperlukannya peran manajemen risiko dalam mengontrol pembangunan proyek EPC pembangkit tersebut. Dalam penelitian ini akan melihat risiko yang berpengaruh dalam pembangunan EPC pembangkit tersebut. Metode yang digunakan adalah deskriptif, kuisioner, serta validasi pakar yang kemudian data dari kuisioner akan diolah dengan perangkat lunak SPSS. Variabel yang digunakan dalam penelitian sebanyak 54 variabel risiko yang terjadi pada proses EPC.
Dalam penelitian ini didapatkan 9 variabel dominan yang berpengaruh pada pembangunan proyek EPC pembangkit yaitu 3 variabel dari tahap rekayasa, 2 variabel dari tahap pengadaan, dan 4 variabel pada tahap konstruksi serta mitigasi dalam mengatasi setiap risiko tersebut. Risiko yang didapat ternyata yang terbanyak masih berada pada tahap rekayasa dan konstruksi sehingga dibutuhkan pengontrolan yang lebih terhadap tahap tersebut untuk mencegah keterlambatan.

As of now Indonesia government are focusing on building on electricity program 35.000 MW, to provide and enlight across the country. Because as per current data Indonesia still have low supply to support all society with existing power plant. That is why this ongoing program which run by the goernment can fulfill needs of required electricity. In this case risk management have role to control EPC project of all power plant which currently being build.
In this research, it will elaborate the risk impact to the EPC power plant construction. Research method use are descriptive, qusionaire, and expert validation which align with questionaire that being processed used SPSS software. Variabel used in this research are 54 risk variabel that happen during EPC process.
Result by doing this action acquaire 9 dominant variabel impact to EPC project power plant which consist 3 on engineering process, 2 variabel in procurement level, and 4 in cosntruction level, include also mitigation action to comprehend those risk. Result showed that risk mostly occurs during engineering and contruction process which explain that needs more control on those process to avoid any delay.
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Depok: Fakultas Teknik Universitas Indonesia, 2017
T47963
UI - Tesis Membership  Universitas Indonesia Library
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Yuniarto
"[ABSTRAK
Analisis Risiko Kesehatan Lingkungan Akibat Pembuangan Limbah Cair
Pembangkit Listrik Tenaga Panas Bumi (PLTP) Ulumbu ke Sungai (Pada Lapangan
Panas Bumi Ulumbu, Kabupaten Manggarai, Nusa Tenggara Timur)
Pembangkit Listrik Tenaga Panas Bumi (PLTP) merupakan salah satu sumber
energi yang ramah lingkungan karena menghasilkan volume limbah yang rendah,
salah satunya adalah limbah cair. Limbah cair panas bumi mengandung unsur
kimia, salah satunya adalah Arsen. Limbah cair PLTP akan menimbulkan dampak
apabila dibuang secara langsung ke sungai. Tujuan penelitian ini adalah untuk
mengidentifikasi besarnya konsentrasi Arsen pada limbah PLTP dan air sungai di
lokasi penelitian dan dampaknya terhadap konsentrasi Arsen di sungai serta dampak
terhadap kesehatan lingkungan. Dari penelitian ini didapatkan hasil konsentrasi
Arsen pada limbah PLTP sebesar 0,0365 mg/l. Kandungan Arsen dalam limbah
yang dibuang masih berada di bawah baku mutu, yaitu sebesar 0,5 mg/l.
Pembuangan limbah cair PLTP ini juga tidak meningkatkan konsentrasi Arsen di
sungai. Konsentrasi Arsen pada air yang dikonsumsi masyarakat adalah 0,008 mg/l.
Perhitungan risiko kesehatan masyarakat yang mengkonsumsi air sungai
menunjukkan tidak menimbulkan risiko kesehatan RQ < 1 (RQ = 0,6522).

ABSTRACT
Geothermal power plant is one of the green energy which produces low waste
volume, including wastewater. Geothermal wastewater contains Arsenic, a
dangerous chemical. It can generate impact when it is discharged to the river
nearby. The purpose of this research is to identify Arsenic concentration in the
geothermal wastewater and in the river on the research location. The result of this
research shows that geothermal wastewater Arsenic concentration is still below the
regulation, that is 0,0365 mg/l. Its content in the discarded waterwaste is still below
the quality standar, which is 0,5 mg/l. Geothermal wastewater discharge has no
effect to the Arsenic concentration in the river. Arsenic concentration in the river
that people consume is 0,008 mg/l. Based on this concentration, health risk
assessment ot the comunity who consume the water from the river shows no
harmful potential to cause health problem as the RQ less than 1 (RQ = 0,6522).;Geothermal power plant is one of the green energy which produces low waste
volume, including wastewater. Geothermal wastewater contains Arsenic, a
dangerous chemical. It can generate impact when it is discharged to the river
nearby. The purpose of this research is to identify Arsenic concentration in the
geothermal wastewater and in the river on the research location. The result of this
research shows that geothermal wastewater Arsenic concentration is still below the
regulation, that is 0,0365 mg/l. Its content in the discarded waterwaste is still below
the quality standar, which is 0,5 mg/l. Geothermal wastewater discharge has no
effect to the Arsenic concentration in the river. Arsenic concentration in the river
that people consume is 0,008 mg/l. Based on this concentration, health risk
assessment ot the comunity who consume the water from the river shows no
harmful potential to cause health problem as the RQ less than 1 (RQ = 0,6522).;Geothermal power plant is one of the green energy which produces low waste
volume, including wastewater. Geothermal wastewater contains Arsenic, a
dangerous chemical. It can generate impact when it is discharged to the river
nearby. The purpose of this research is to identify Arsenic concentration in the
geothermal wastewater and in the river on the research location. The result of this
research shows that geothermal wastewater Arsenic concentration is still below the
regulation, that is 0,0365 mg/l. Its content in the discarded waterwaste is still below
the quality standar, which is 0,5 mg/l. Geothermal wastewater discharge has no
effect to the Arsenic concentration in the river. Arsenic concentration in the river
that people consume is 0,008 mg/l. Based on this concentration, health risk
assessment ot the comunity who consume the water from the river shows no
harmful potential to cause health problem as the RQ less than 1 (RQ = 0,6522).;Geothermal power plant is one of the green energy which produces low waste
volume, including wastewater. Geothermal wastewater contains Arsenic, a
dangerous chemical. It can generate impact when it is discharged to the river
nearby. The purpose of this research is to identify Arsenic concentration in the
geothermal wastewater and in the river on the research location. The result of this
research shows that geothermal wastewater Arsenic concentration is still below the
regulation, that is 0,0365 mg/l. Its content in the discarded waterwaste is still below
the quality standar, which is 0,5 mg/l. Geothermal wastewater discharge has no
effect to the Arsenic concentration in the river. Arsenic concentration in the river
that people consume is 0,008 mg/l. Based on this concentration, health risk
assessment ot the comunity who consume the water from the river shows no
harmful potential to cause health problem as the RQ less than 1 (RQ = 0,6522).;Geothermal power plant is one of the green energy which produces low waste
volume, including wastewater. Geothermal wastewater contains Arsenic, a
dangerous chemical. It can generate impact when it is discharged to the river
nearby. The purpose of this research is to identify Arsenic concentration in the
geothermal wastewater and in the river on the research location. The result of this
research shows that geothermal wastewater Arsenic concentration is still below the
regulation, that is 0,0365 mg/l. Its content in the discarded waterwaste is still below
the quality standar, which is 0,5 mg/l. Geothermal wastewater discharge has no
effect to the Arsenic concentration in the river. Arsenic concentration in the river
that people consume is 0,008 mg/l. Based on this concentration, health risk
assessment ot the comunity who consume the water from the river shows no
harmful potential to cause health problem as the RQ less than 1 (RQ = 0,6522).;Geothermal power plant is one of the green energy which produces low waste
volume, including wastewater. Geothermal wastewater contains Arsenic, a
dangerous chemical. It can generate impact when it is discharged to the river
nearby. The purpose of this research is to identify Arsenic concentration in the
geothermal wastewater and in the river on the research location. The result of this
research shows that geothermal wastewater Arsenic concentration is still below the
regulation, that is 0,0365 mg/l. Its content in the discarded waterwaste is still below
the quality standar, which is 0,5 mg/l. Geothermal wastewater discharge has no
effect to the Arsenic concentration in the river. Arsenic concentration in the river
that people consume is 0,008 mg/l. Based on this concentration, health risk
assessment ot the comunity who consume the water from the river shows no
harmful potential to cause health problem as the RQ less than 1 (RQ = 0,6522).;Geothermal power plant is one of the green energy which produces low waste
volume, including wastewater. Geothermal wastewater contains Arsenic, a
dangerous chemical. It can generate impact when it is discharged to the river
nearby. The purpose of this research is to identify Arsenic concentration in the
geothermal wastewater and in the river on the research location. The result of this
research shows that geothermal wastewater Arsenic concentration is still below the
regulation, that is 0,0365 mg/l. Its content in the discarded waterwaste is still below
the quality standar, which is 0,5 mg/l. Geothermal wastewater discharge has no
effect to the Arsenic concentration in the river. Arsenic concentration in the river
that people consume is 0,008 mg/l. Based on this concentration, health risk
assessment ot the comunity who consume the water from the river shows no
harmful potential to cause health problem as the RQ less than 1 (RQ = 0,6522)., Geothermal power plant is one of the green energy which produces low waste
volume, including wastewater. Geothermal wastewater contains Arsenic, a
dangerous chemical. It can generate impact when it is discharged to the river
nearby. The purpose of this research is to identify Arsenic concentration in the
geothermal wastewater and in the river on the research location. The result of this
research shows that geothermal wastewater Arsenic concentration is still below the
regulation, that is 0,0365 mg/l. Its content in the discarded waterwaste is still below
the quality standar, which is 0,5 mg/l. Geothermal wastewater discharge has no
effect to the Arsenic concentration in the river. Arsenic concentration in the river
that people consume is 0,008 mg/l. Based on this concentration, health risk
assessment ot the comunity who consume the water from the river shows no
harmful potential to cause health problem as the RQ less than 1 (RQ = 0,6522).]"
2016
T-Pdf
UI - Tesis Membership  Universitas Indonesia Library
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Teguh Perdana Putra
"Potensi energi geotermal Indonesia merupakan yang terbesar di dunia, namun kini baru diutilisasi sekitar 4% dari potensi tersebut. Penelitian ini bertujuan mengoptimalkan penempatan sumur produksi geotermal di lapangan X agar risiko aktivitas pengembangan skema produksi dapat diminimalisasi. Pada penelitian ini dilakukan pemodelan dan simulasi reservoir dengan menggunakan data 3G (Geologi, Geofisika dan Geokimia) dari lapangan X dan data dari sumur yang telah ada. Dengan menggunakan TOUGH2, PETRASIM dan GeoSlicer-X, pemodelan forward yang mencakup adjustment dari litologi dan posisi sources dilakukan hingga model reservoir mencapai kondisi natural state.
Data hasil simulasi reservoir kemudian diregresi menggunakan MATLAB serta dilakukan optimasi numerik guna mendapatkan titik-titik penempatan sumur produksi yang diajukan untuk penambahan kapasitas terpasang di lapangan X. Didapatkan hasil penelitian titik optimum penempatan sumur produksi pada koordinat x 3276 m dan y 4262 m dengan nilai entalpi spesifik maksimum 1529,9 kJ/kg; serta 6 titik penempatan sumur produksi dengan nilai entalpi spesifik 1500, 1450 dan 1400 kJ/kg. Dengan demikian, penambahan kapasitas terpasang dari skema produksi tambahan ini diestimasi dapat mencapai 43,5 MWe.

Indonesia has the biggest estimated geothermal energy reserve in the world, but only 4% of that reserve currently utilized to generate electricity. The purpose of this research is to optimize the production well placements at X field to minimize the failure risk of production scheme development. In the research, reservoir modelling and simulation is conducted based on 3G (Geological, Geophysical and Geochemical) data and existing wells data. Forward modelling process, which covers the lithology and sources position adjustment, is executed with TOUGH2, PETRASIM and GeoSlicer-X to validate the reservoir model towards natural state condition.
Using MATLAB, the resulting data is regressed and used to numerically optimize the production well placement decision based on the fluid specific enthalpy. The new production scheme is proposed to further increase the installed capacity in X field. The final result is the optimal point of well placement; which is 3276 m in x coordinate and 4262 m in y coordinate with the maximum specific enthalpy value of 1529,9 kJ/kg and 6 (six) other points with specific enthalpy of 1500, 1450 or 1400 kJ/kg. Thus, the improvement of the installed capacity with the proposed production scheme is estimated to reach 43,5 MWe.
"
Depok: Fakultas Teknik Universitas Indonesia, 2014
S54875
UI - Skripsi Membership  Universitas Indonesia Library
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Dedy Priambodo
"PLTN HTGR berdaya kecil mempunyai efisiesi 25%, sehingga perlu dilakukan usaha untuk meningkatkannya. Tujuan dari penelitian adalah untuk mendapatkan sistem kogenerasi HTGR-siklus refrijerasi dengan performa teknis dan ekonomis yang baik. Pemodelan HTGR dengan Cycletempo dan perhitungan energi, eksergi dan ekonomi terhadap sistem kogenerasi telah dilakukan. Hasil perhitungan eksergi menunjukan reaktor adalah komponen paling tidak efisien, akibat ireversibilitas transfer energi dari reaksi pembelahan ke pendingin helium dan beda temperature di reaktor. Disisi refrijerasi, ireversibilitas tertinggi terjadi pada generator dan evaporator, karena ireversibilitas transfer panas dan perbedaan temperatur. Analisis energi-eksergi mendapatkan rasio tekanan berbanding terbalik terhadap COP disebabkan meningkatnya irevesibilitas total siklus. Sementara temperatur generator, konsentrasi ammonia dan temperature evaporator berbanding lurus terhadap COP. Sedangkan pemanfaatan kogenerasi hanya mampu meningkatkan efisiensi siklus 0.7%. Untuk dapat memenuhi BPP PLN, HTGR harus mempunyai biaya sesaat 5,500 $/kWh? 6,500 $/kWh, faktor kapasitas diatas 75% dan discount rate 5%. Biaya pembangkitan sistem kogenerasi 1.5% lebih tinggi dibanding pada HTGR. Karena biaya panas lebih dominan dalam biaya pendinginan maka sistem dengan COP tinggi mempunyai biaya pendinginan yang murah. Biaya pendinginan sistem kogenerasi masih lebih murah dibandingkan dengan sistem konvensional. Selisih biaya pendinginan kogenerasi dengan sistem konvensional berkisar 6.86 - 11.24 ¢/kWh merupakan keuntungan langsung dari sistem kogenerasi yang dapat dijadikan subsidi bagi biaya pembangkitan.

HTGR Rankine Steam Cycle has a low efficiency, around 25%, therefore need to concern for improve the efficiency. The purpose of study was to obtain HTGR refrigeration cogeneration with the best technical and economic performance. Cycletempo modeling, energy exergi and economy analysis have done. Exergi calculation shows the nuclear reactor is the most inefficient, due to the irreversibility of the transfer of energy from fission to coolant helium and temperature difference. While the refrigeration side, the most inefficient located at generator and evaporator, due to heat transfer and temperature difference. Energy-exergy analysis shows pressure ratio affects to the COP inversely due to increased total irreversibility of cycle. While the generator temperature, ammonia concentration and evaporator temperature is proportional to the COP. Application of cogeneration will increase efficiency about 0.7% from single purpose HTGR. To fulfill BPP PLN, HTGR should have overnight cost $ 5.500 - $ 6.500 / kWh, capacity factors above 75% and 5% discount rate. Generation cost of cogeneration would be 1.5% more than HTGR single purpose. Heat cost have biggest share on cooling cost, so that system with high COP is cheaper than other. Cooling cost of cogeneration systems is cheaper than fossil-fired system. Difference in cooling cost between fossil and cogeneration system about 6.86 - 11.24 ¢/kWh is a revenue of the cogeneration that can be use as subsidize for generation cost.
"
Depok: Fakultas Teknik Universitas Indonesia, 2015
T43818
UI - Tesis Membership  Universitas Indonesia Library
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