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Abstrak :
Design of mechanic transmission of control rod research reactor. Mechanic transmission of control rod research reactors is reactors exellent component used to ascend and descend reactor fuel. The problem nowadays to ascend or descent reactor fuel is using two motors...

Abstrak :
Perpindahan data yang besar dan semakin cepat belakangan ini menuntut perangkat peralatan IT (information technology) bekerja pada performa yang tinggi. Performa suatu perangkat IT yang tinggi juga akan membuat panas yang dihasilkan perangkat IT ke lingkungan sekitar semakin tinggi. Selain itu, hal tersebut juga membuat konsumsi energi pada perangkat IT semakin tinggi akibat panas yang dihasilkan serta membuat beban kerja sistem pendingin perangkat IT meningkat. Suhu dan aliran udara di dalam ruangan data center merupakan salah satu komponen keamanan pada data center yang harus diperhatikan. Standar optimal ruangan data center yang direkomendasikan menurut standar ASHRAE (2011) yaitu antara 18-27 ^oC. Tujuan dari penelitian ini untuk mensimulasikan pola aliran temperatur dan aliran kecepatan udara di dalam ruangan data center kemudian dilakukan anlisa mengenai performa pendinginan rak. Penelitian ini, ruang server akan disimulasikan menggunakan software CFD dengan bantuan aplikasi CAD untuk menggambarkan geometri dan ANSYS 16.2 untuk melakukan simulasi perpindahan panas dan aliran udara di dalam ruangan. Ruangan server diketahui menggunakan raised floor air conditioner dengan temperatur inlet udara sebesar 16-17 oC dan kecepatan aliran udara ke ruangan 2.65 m/s. Berdasarkan hasil simulasi didapatkan gambaran mengenai temperatur udara ketika meninggalkan rak mencapai 27 oC dan temperatur total di dalam ruangan sebesar 23 oC. Kemudian dilakukan layout ulang dari rak dan didapati nilai RCI rata-rata pada rak initial mencapai 90.83% sementara pada layout baru sebesar 95.75%. Nilai SHI layout initial rata-rata sebesar 0.353 sementara pada layout baru sebesar 0.306.

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The large and faster data transfer nowdays, requires IT equipment devices to work at high performance. The performance of a high IT device will also make the heat generated by IT devices to the surrounding environment higher. In addition, this also makes energy consumption in IT devices higher due to the heat generated and makes the cooling system workload of IT devices increase. Temperature and air flow in a data center room is one of the security components in the data center that must be considered. The optimal standard for data center rooms that are recommended according to ASHRAE (2011) standards is between 18-27 oC. The purpose of this study is to simulate the pattern of temperature distribution and air velocity flow in the data center room including cooling performance analysis. In this research, a data center room simulated using CFD software with the help of CAD applications to describe geometry and ANSYS 16.2 to simulate heat transfer and air flow in the room. The server room is known to use raised floor air conditioner with an air inlet temperature of 16-17 ^oC and air flow velocity to room 2.65 m/s. Based on the simulation results, the air temperature when increasing the rack reaches 27 oC and the total server room temperature is 23 oC. Then the re-layout of the rack has been done and it was found that the average RCI value on the existing rack reached 90.83% while the new layout was 95.75%. The average SHI value of existing rack is 0.353 while in the new layout it is 0.306.

Abstrak :
Sebagai salah satu kendaraan ( mobil ) yang termasuk dalam katagori hobi VW 1500 merupakan kendaraan model lama yang menggunakan Steering System model Wom Gear, Pada kenyataannya bagi banyak pemilik kendaraan jenis lni sering terjadi permasalahan mengenai steering systemnya, baik itu daya tahan komponen, tingkat keresponsifan steering systemnya, maupun beban yang dirasakan pada kemudl( Steertng Wheel). Sebenamya dengan desain konstruksl dimana titik beratnya terletak agak kebelakang dan penggerak roda belakang serta menggunakan jenis suspensi depan torsi (front beam axle ), kendaraan tipe ini sangat cocok blla menggunakan Rack & Pinion Steering System. Pembahasan yang dilakukan adalah merancang dan menghitung ulang Rack & Pinion Steeling System yang akan menggantikan Wonn Gear Steering System pada VW 1500, dan sedapat mungkin mendekati teorema yang ada mengenai steering system ( Hal apa saja yang sebenamya harus diperhatlkan untuk melakukan perubahan steering system inl. dan bagalmana sebenamya pengaruh dari perubahan ltu). Dengan rincian diatas, make hasll dari tugas akhir lnl akan diperoleh mengenai penerapan Rack & Pinion Steering System pada VW 1500 ( termasuk perancangan mekanisme geraknya } dan pengaruh - pengaruhnya akibat pergantian dari Worm Gear Steering System. ......1500 cc VW, as one of hobby in automobiles, ls an old fangled automobiles having worm gear steering system. The owners of this automobiles often get many troubles around the steering systems, such as the strength of the spare part, the steering responsibility and the power that driver should give to tum the steering wheel. Actually, with the construction design where the position of equilibrium point Is a little bit backward, rear wheel vehicle and the use of front beam axle suspension, this automobile is very suitable in using the rack & pinion sleeting system. The main topic it1 this thesis is to design and re-count the rack & pinion steering system which will exchange the worm gear steeling system in 1500 cc VW and as close as the theory of steerin9 system ( it about every thing that should be concerned in the exchange of the steering system. and also about the effect of this exchange). As it has been said at the paragraph above, so the output of this thesis is about the appi1cation of rack & pinion steeling system in 1500 cc VW { including the moving mechanism design ) and the effects because of the exchange from worm gear steering system.

Abstrak :
With the growth of utilizing natural gas all over the world, Liquefied Natural Gas (LNG) has been widely used in the modern era due to its advantages of storage and transportation. When LNG is unloaded in import terminal, in the time of need, the process of returning natural gas into its gaseous form is being done in the regasification unit with different technologies in order to process the gas and then distribute it by pipeline networks to the end users. Choosing the appropriate LNG vaporizer which is both cost effective and suitable to conditions of the location and environment is intended to be evaluated. The framework of this paper is studying of some of the different LNG vaporization methods and comparing their features and properties that each of them has. The goal of this paper is in the first step, comparison of technologies which are Open Rack Vaporizer (ORV), Shell and Tube Vaporizer (STV), and Intermediate Fluid Vaporizer (IFV) and defining the suitable vaporizer to do the simulation as the second step as well as evaluating the economical features of the project. While the Shell and Tube Vaporizer has been chosen, the regasification plant using three different heating medium, propane, steam, and 50/50 mixture of water and glycol has been designed. At the end, the economic evaluation has been done with total capital investment of 62 million dollars in the service life of 10 years. The NPV is calculated 11.33 million dollars and the salvage value is calculated to be 5.2 million dollars. Each heating medium is considered to be effective depending on the locations and conditions.