Shaffira Adelina Aristiana

Biodata

Foto Diri

Nama Lengkap : Shaffira Adelina Aristiana

Nama Panggilan : Adel

NPM : 1806187700

Tempat, tanggal lahir : Jakarta, 18 Januari 2001

Jurusan : Teknik Mesin

Angkatan : 2018

I am a 3rd year Mechanical Engineering student in UI. In my spare time, I like to read novels and comics of any genre. As the saying goes: "Book is the window of the world", reading is my way to expand my knowledge and introduce myself with differing perspectives, experiences, and beliefs from my own. I also take extracurriculars outside campus such as Japanese language course and animation class to better my skills in respective fields. Following graduation, I'm planning to take Biomedical Engineering for my masters' degree.

Pertemuan I (23/02/2021)

Kondisi saya hari ini baik, baik fisik dan rohani.

- Menurut saya, keadaan yang mengambarkan Keadilan sosial bagi seluruh rakyat Indonesia ialah waktu dimana semua rakyat mempunyai hak yang sama sejak lahir. Semua memulai dalam keadaan yang sama, baik dalam segi ekonomi, kesehatan, sosial, dll. Salah satu peran mahasiswa, terutama mahasiswa dalam Fakultas Teknik seperti saya sendiri, adalah meningkatkan tingkat kesejahteraan dan kesetaraan dan mengurangi kesetimpangan yang terjadi akibat perbedaan ras, suku, agama, dan strata sosial lainnya yang ada di masyarakat Indonesia dengan, selain berkontribusi dalam bentuk penemuan-penemuan dan pembaharuan teknologi, kita juga perlu memastikan semua golongan masyrakat mendapatkan akses dan kesempatan yang sama untuk menerima manfaat dari teknologi-teknologi tersebut.

- Seperti Persamaan Energi Mekanik, di setiap titik dalam persamaan akan menghasilkan nilai energi mekanik yang sama (konstan).

- Ventilator: alat yang menerapkan konsep konversi energi yang mengubah energi listrik menjadi energi kinetik untuk memompa piston untuk mendorong oksigen masuk ke paru-paru melalui selang udara.

- Energi adalah sesuatu yang tidak bisa dilihat, namun dapat dirasakan. Contohnya seperti matahari dan angin. Energi panas dan mekanik (gerak) yang dihasilkan oleh keduanya mungkin tidak bisa kita lihat secara langsung dengan mata telanjang, tetapi dapat kita dapat pastikan keberadaannya dari efeknya dalam kehidupan sehari-hari, seperti panas matahari yang membakar kulit dan hembusan angin yang menyapu dedaunan yang tersebar di jalanan. Energi juga tidak bisa diciptakan, hanya berubah bentuk dari satu ke lainnya, contohnya seperti peristiwa fotosintesis pada siang hari dalam organ daun yang mengubah energi panas menjadi senyawa kimia yang dibutuhkan tanaman untuk hidup.

Pertemuan II (24/02/2021)

- Homework: "Fill in the blanks with the correct name of each corresponding component of a Power Plant."

Below is a schematic diagram of a Combined Cycle Power Plant.

Skema Diagram dari Power Plant

Description: (1) Gas Turbine; (2), (4), (6) HP (High Pressure) Superheater; (3), (5), (9) IP (Intermediate Pressure) Superheater; (7), (16) HP Evaporator; (8), (10), (13), (15) HP Economizer; (11) LP (Low Pressure) Superheater; (12) IP Evaporator; (14) IP Economizer; (17) LP Economizer); (18) HP Water Tank/Drum); (19) IP Water Tank/Drum); (20) LP Water Tank/Drum; (21) IP Pump; (22) HP Pump; (23) LP Pump; (24) HP Steam Governor Control Valve; (25) IP Steam Governor Control Valve; (26) HP Steam Turbine; (27) IP Steam Turbine; (28) IP Steam Governor Control Valve; (29) Volume Control; (30) Condenser; (31) HP Water Tank/Drum Control; (32) IP Water Tank/Drum Control; (33) LP Water Tank/Drum Control; (34) HP Evaporating Loop; (35) IP Evaporating Loop; (35) LP Evaporating Loop; (37) Alternator

Pertemuan III (02/03/2021)

- Homework: "Study OpenModelica software and learn the basics of its operation and features."

OPenModelica is an open-source Modelica-based modeling and simulation environment intended for industrial and academic usage. It provides basic components for system-level modeling, in particular for the study of control systems in traditional and innovative power plants and energy conversion systems. The software allows users to construct their own models using the available sources and evaluate said model’s performance and make predictions of the real-life system.

OpenModelica offers quite a number of subsystems in its environment. Some of the few important ones: OMNotebook, which is a lightweight notebook editor, OMEdit, which is a graphical connection editor to design component-based model, OMOptim, which extends the capabilities of OM towards design optimization, and OMShell, which is an interactive command-line session handler for Modelica scripting.

Welcome

Modelling

Plotting

Debugging

When you open OM, you will be greeted with the default interface that is the Welcome layer. This layer relays information such as new updates regarding the software and recently opened OM files. On the bottom right page, it is shown some tabs that you can click on in order to navigate across other layers/functions. There are 4 layers of function: Welcome, Modelling, Plotting, and Debugging. Modeling is where you will be putting components together, forming a functional model design. If you decide to run a simulation of your model, a summary of the system's performance will become available in Plotting. You can then perform a debug on your system in Debugging.

As an exercise, I decided to try my hands at creating a mini-Gas Turbine model based on the Combined Cycle Power Plant that was included in last week's lecture. All components can be found under ThermoSysPro system library. From then on, you can experiment with the parameters of each component to see which set of values will set off a reaction within the system and produce a result.

A Gas Turbine model made using OM

- A system is a group of components or elements working together to perform a certain task. The easiest example to explain this would be the processes that occur inside our body, one of them being the reproduction system. The reproduction system is made up of primary (ovaries and testes) and secondary reproductive organs (other organs, ducts, glands). They all work in harmony to allow beings to reproduce and create offspring, ensuring the species' survival.

- Energy changes from one form to another, constantly and continuously, within a system. However, the total amount of it remains constant throughout the whole process, only to be conserved over time. This is the law of conservation of energy. The law states that energy cannot be created nor destroyed; rather can only be transformed. For instance, potential energy is converted into kinetic energy accordingly to the height at which a free-falling object is currently located. Through the entire activity, the total mechanical energy the object possesses remains the same. Another example to explain this would be Bernoulli eq. that is a derivation of the energy conservation principle itself. It said that the total of energy in all forms in a steady flow fluid is the same at any point on that streamline.

Pertemuan IV (03/03/2021)

- Brayton cycle

The Brayton cycle (or Joule cycle) represents the operation of a gas turbine engine. The cycle consists of four processes, as shown in Figure 3.13 alongside a sketch of an engine:

States in a Brayton cycle

1.) a - b: Adiabatic, quasi-static (or reversible) compression in the inlet and compressor; 2.) b - c: Constant pressure fuel combustion (idealized as constant pressure heat addition); 3.) c - d: Adiabatic, quasi-static (or reversible) expansion in the turbine and exhaust nozzle, with which we (a) take some work out of the air and use it to drive the compressor, and (b) take the remaining work out and use it to accelerate fluid for jet propulsion, or to turn a generator for electrical power generation; 4.) d - a: Cool the air at constant pressure back to its initial condition.

First, ambient air is drawn into one end of the turbine. In the compressor section of the turbine, air molecules are squeezed together. As the air is squeezed, it gets hotter and the pressure increases. The fuel is injected into the system in the combustor section, where it mixes with the hot, compressed air and is burned. The hot gas created from the hot air and fuel mixture moves the turbine. The turbine then captures the energy from the expanding gas, which causes the drive shaft, which is connected to the generator, to rotate. In a combined cycle power plant, the exhaust gas from the gas turbine is recycled to heat water and create steam to spin the steam turbine blades with their own drive shaft that turns the generator, producing 50% electricity in comparison to a power plant utilizing either gas turbine or steam turbine only.

Brayton cycle

Pertemuan V (09/03/2021)

- In today's lecture, we were taught how to create a combustion chamber model on OpenModelica. We assembled the components into a system, then input values into parameters to create a result. These pictures below serve as documentation of our activity.

Inserted parameters on Fuel inlet

Inserted parameters on Water inlet

Inserted parameters on Air inlet

Combustion model simulation

At the end of the lecture, Mr. DAI assigned us homework to observe and take note of any difference that may occur if the values inserted into the system are changed.

Pertemuan VI (09/03/2021)

- Homework: Make changes to variables that are entered in each component and see if there are any changes that occur on the simulation result.

File:Observation table adel.png

Observation table

Pertemuan VII (10/03/2021)

- Today we learn about how to make a compressor model in OpenModelica using pre-determined values set as parameters. The set of parameters can be checked on Mr. DAI's page.

Pertemuan VII (10/03/2021)

- Today we discuss our homework from the last meeting which was to create a simple Gas Turbine model in OpenModelica and then we conduct a group discussion to ruminate on the effects of altering each singular components on the end simulation.