Patrick Ray Samperuru

Introduction

• NAME: Patrick Ray Samperuru
• NPM: 2106718306
• EMAIL: patrick.ray@ui.ac.id

Greetings!

My name is Patrick Ray Samperuru, I am an undergraduate mechanical engineering student from batch 2021 at Universitas Indonesia. Currently, my passion and interests revolve around manufacturing engineering ranging from automation to supply chain management, as I seek to one day revolutionize the manufacturing industry in Indonesia. In the Numerical Method course, I hope to learn many new things that would help open my consciousness towards the real world!

Class Recaps

23 May 2023

The first class of Numerical Method with our lecturer, Pak Dr. Ahmad Indra Siswantara, involved the introduction to the concept of his base teaching regarding consciousness and his theory of "I'm my consciousness". According to Pak DAI, our consciousness plays a pivotal role in the way we grasp things in life as demonstrated by how we are able to comprehend numerical mathematical problems of 1/0 which equals infinity and (x^2-1)/(x-1). He explains how our consciousness is a gift from God that separates us from other living beings in which Pak DAI introduces the concept of CCIT or Cara Cerdas Ingat Tuhan. Here, we are invited to discuss the importance of consciousness and how it relates to using numerical method. Finally, Pak DAI assigned us our project for the remainder of the semester.

30 May 2023

In todays class of Numerical Method, Pak DAI asked us to discuss the Hydrogen Tank Design and Optimization project within the class with every class member to gain better knowledge on developing our overall results. Throughout the class, I moderated the discussion as a replacement for the class coordinator, M. Jiddan Walta, who was at the time absent due to exchange matters. In this discussion, we started by making an outline on the project objective function which was to create a functional hydrogen tank design that is optimized following the constraint parameters of pressure at 8 bars, a capacity of 1 liter, and a maximum budget of 500,000 IDR. To achieve this budget, we discussed several potential materials that could be used in the design based on the different types of tanks (type I, type II, etc.) such as all metal, composite with non-metal liner, and so forth.

We conversed the 3 main points needed in our optimization. This include the design variable, objective function, constraint which can be different for every class member. I personally started by explaining that my objective function is to accommodate the usage of hydrogen tanks in environments that are more complex and dynamic meaning it would need a constraint of a high strength and wear fatigue so that is can used for long term. I continue by adding that this can be achieved by choosing an all metal tank for the material as it has a high value for strength while also being within the allocated budget. Afterwards, I also listened some of others' ideas to further brainstorm and gain inspiration. According to Vegantra Siaga, he wanted a pressure constraint because hydrogen storage systems often have pressure limits to ensure safe operation, where pressure constraints can be defined as upper and lower bounds on the hydrogen storage pressure that prevent the storage system from operating outside the desired pressure range. For Faris Pasya, space and weight constraints can be used as well depending on the application, there may be limitations on the available space or weight of the pressurized hydrogen system. These constraints can influence the choice of tank size, material selection, and system layout. This gave me insights to think more on my personal project and find other perspectives.

Pak DAI stated that we need to discuss the next steps to take because the deadline for the project is next week on Tuesday, 6 June 2023. Thus, I began the discussion again regarding the points needed for completing the project which is first to find the constraints based on the objective function, then to conduct research on different materials and dimensions that could potentially be used, followed by finalizing the chosen design variables based on the constraints, and creating the code whether it is on Python or MATLAB to calculate the design following the constraints numerically. Finally, with everything in order the discussion was ended.

Hydrogen Tank Design and Optimization Project

Project Overview and Case Study

The individual project for the Numerical Method course with Pak Dr. Ahmad Indra Siswantara is the design and optimization of a pressurized hydrogen tank with constraints we need to consider being the gas pressurized at 8 bars, a required volume of 1 liter, and a maximum budget of 500,000 IDR. In this case study, we are asked to create the hydrogen tank design while also being within the set parameters. The details of our design is free to our choice, ranging from the material selection to the dimensions of the diameter as well as length of the tank.

Hydrogen tanks, also known as hydrogen cartridges or cylinders, refer to containers that are used for storing hydrogen may it be in a gaseous or liquid state. The chemical element of hydrogen (H) is a non-metal that has an atomic number of 1, which is gas at room temperature making it the lightest element. Hydrogen is highly utilized in various industries used in fuel cells for generating power, refining petroleum, as well as producing fertilizer. Despite its many uses, hydrogen is a highly combustible energy carrier which can diffuse with certain materials, meaning there are risks that come with its storage. Several important aspects that need to be considered when creating a storage for hydrogen as following:

• Fatigue Resistance: As the tank will be filled and refilled after usage often, it will go through a cycling of load which in time will deteriorate the condition of the tank. Additionally, hydrogen can embrittle certain materials made of metal causing further wear in the container. With this, it is crucial that the hydrogen tank has a high fatigue resistance to withstand wear over time.

• Leak Tightness: Leaks in the tank can cause serious damage due to the nature of the hydrogen. As a fuel, this element is highly flammable making it prone to causing fires when exposed to potential sparks/ignition. Given hydrogen tanks are stored in a cluster, a leakage can result in explosions endangering operations as well as human life. Thus, it is important for tanks to always retain its hydrogen and only be released under controlled conditions.

• Adequate Weight: The weight of hydrogen tanks while not light still need to be considered for the application of transportation. The storage of hydrogen tanks are usually in accumulation meaning in quantities more than one. Given this condition, it is important to consider the weight of the tanks to ensure that more tanks can be transported in one time, thus cutting costs and creating more profit.

• Effective Construction: The design of hydrogen tanks need to be optimized in a sense that there is a optimized amount of room for the tank to store the hydrogen element. In an effective construction, the tank has enough thickness to prevent leakage and have a high resistance to fatigue while also maximizing the area for the hydrogen to be stored. This would lower the cost for manufacturing as well as maintenance as the material usage is optimal while being able to bring the most amount of hydrogen.

Objective Function: Hydrogen Tank Project

The objective function of this project refers to the quantity that is to be optimized in the design variables with the restrictions of the constraints. For my project, the main goal is to achieve the maximum number of the tank's strength while following the given conditions and being within the manufacturing budget range of 500,000 IDR. This is because my aim for the project is for the tank to be able to be utilized in any working environment, meaning it must be able to withstand forces exerted on the tank to maintain safety of the hydrogen inside.

Design Variables: Dimensions of Hydrogen Tank Design

To be able to achieve the objective function of the Hydrogen Tank project, the design variables must be optimized while also following the specifications of the constraints given. These design variables will be tested to the upper limit to maximize the quantities that is within the objective function in order to be able to set best results possible in achieving the set goals. In creating the design variable