Biomass Stove Design Based Quality Function Deployment (QFD) and Design For Manufacture And Assembly (DFMA)

This study aims to design a biomass stove as a solution for lack of LPG gas in the community in Batu Panjang, Rupat Island, Riau. The Quality Function Deployment (QFD) method is used in this study by elaborating consumer needs through public opinion needs (questionnaire survey) and elaboration of the characteristics of consumer needs. A House of Quality (HoQ) matrix was created to determine the technical characteristics for design analysis of biomass stove and designed using the Design for Manufacture and Assembly (DFMA). The result was a development of "Biomass Stove", which consists of a funnel for fuel, a fire funnel, a filter and an air chamber. The funnel chamber, which the fuel was made the insulation channel and the joining of the fire connector, forms an angle to increase the heat flow to funnel fuel and reduce the heat loss during cooking. The stove design is made safe, comfortable for users and environmentally friendly due to the existence of a filter and air chamber cover. The biomass stove was designed portable, and then it was light and easy to move around.

Energy Analysis of Steam Cycle Efficiency with Feed Water Heater Modification (Case Study: PT. Pertamina EP Asset 1 Field Lirik)

The increasing energy efficiency program will decrease the consumption of energy. If these improvements are carried out together, it will certainly ensure energy reliability for a sustainable and better future. The aim of this paper was to investigate the possibility of increasing efficiency in the crude oil heating system at PT. Pertamina EP Asset 1 Lirik Field. The research method was done by modification the steam cycle using the close and open Feed Water Heater (FWH). As result, the efficiency of steam cycle of close FWH increased 2.53% and 2.78% for open FWH. While the efficiency of the steam cycle in the initial conditions was 36.74%.

Benefits of Menaming Dams and the Potential of Irrigation Canals as a Source of Power Generation

The difficult location access and a small population can cause lack of electricity from PLN (State Electricity Company). One alternative that can be done is to use irrigation canals as a source of generation. In this study explained the social conditions of the community, the function of dams for the community and the potential of irrigation canals as a source of power generation. A case study was conducted in the Menaming Village in Riau Province. Menaming dam is one of the dams that have two main irrigation channels that can be used as a source of power generation. A quantitative descriptive method was used in this study. The results of the survey conducted by observing directly, questionnaires and data collection showed that Menaming dam was very beneficial for the Menaming’s community. Menaming dam is used as a source of water for rice fields and community ponds, access to community plantation land, fishing grounds and as a tourist attraction. Based preliminary study in Menaming dam was discovered the hydraulic water power in irrigation canals amounted to 1,330 watts. Therefore, it can be used as a source of power generation to meet the electricity needs of a simple house.

Design of Disc on Disc Wear Test Equipment Using VDI 2221 Method

This study aims to design the build of a wear test tool or a tribometer that intends to measure the coefficient of friction and wear rate in contact materials in form of disc-on-disc. This tribometer test tool can be used in dry contact (without any intermediate material between contacts) or wet contacts (by using intermediate material between contacts such as lubricant). The application of this disc-on-disc type of tribometer is the contact that occurs between roller elements (solid cylinders) and inner rings on cylindrical rolling bearings. In this paper is used the design method of VDI 2221. The steps are to clarify the task, determine the function of structure, look for the principle of the solution and its structure, describe the variants that can be realized and give shape to the model and detail the manufacture and used. This tool is used to test components consisting of two discs where the material can be varied. The design of the surface contact side mechanism is done in a radial direction. So, the disc can rotate (rolling contact) and this test tool can be varied load and rotation. The final result of this study is an engineering document in the form of layout drawings and assembly images as well as detailed images of each component and bills of materials.

Productivity Analysis of Crude Palm Oil (CPO) in PT. Ramajaya Pramukti Using Value Stream Mapping Approach

This study aims to analyze the productivity of CPO processing using Value Stream Mapping (VSM) approach. A case study conducted in PT. Ramajaya Pramukti, Indonesia. The research method used the VSM and Process Activity Mapping (PAM) to determine wastes in the process flow of CPO production. The data was collected in 1 month. The preliminary result of CPO productivity process was average of 73.67%. Based the Future Value Stream Mapping (FVSM) the CPO processing time can be efficient from 1.981 seconds/kg to 1.963 seconds/kg. The productivity processing for value added 1.525 seconds/kg, which non value added of 0.012 and the non necessary value added of 0.383 seconds/kg. The quality of raw materials was the biggest waste contributor. It was caused a longer processing time due to poor quality of raw materials.

Performance Analysis of Plate Punching and Bending Machine Combination

The plate punching and bending combination machine is a machine that belongs to the press type with the use of a punch and a die to make holes or bends in a plate work-piece. This machine uses a hydraulic drive with a maximum working pressure of 700 Bars, which is used as a punch force to work-piece. But, it is not known the value of working pressure this frame can withstand. Therefore, machine performance becomes unknown such as punch force that can be used, work-piece thickness, whole circumference and type of material that can be machined. In this paper, the analysis is carried out using simulation and experimental methods. The simulation method is carried out using Autodesk Inventor software to determine the critical location, which is then measured by experiment. The experimental method is carried out by measuring the stress and deflection. Voltage measurement on the frame is carried out using a strain gauge sensor and measurements are carried out using a dial indicator. The application of a safety factor is 1.5 based on the yield strength of ASTM A36 as the frame material. The deflection that has occurred is 1.15 mm, the maximum working pressure obtained is 27.7 Bars. The maximum punch force is 5441 N.

The Study of Male-Female Chamfer Angle Effect on Aluminum 6061 Forging at Rotary Friction Welding Process

This research aims to investigate male-female chamfer angle effect on forging pressure, specimen length and the maximum tensile strength in splicing 6061 aluminum material, which used the rotary friction welding process. This research employed the analytical method to determine the timing of forging pressure as an initial reference to conduct the experimental study for the specimens test. The specimens were tested by varying the male-female chamfer angle, namely 0°, 15°, 30°, 45°, 60°. The results test were obtained the longest application of forging pressure at the male-female chamfer angle of 60° and the fastest application of forging pressure at the male-female chamfer angle of 15°. The change in length of the specimen during the welding process for each variation of the male-female chamfer angle varies due to the friction time different. The largest change in length was at the male-female chamfer angle of 15° and the smallest change in length at the male-female chamfer angle of 60°. The maximum tensile strength was obtained at the variation of male-female chamfer angle of 60° with a value of 226.47 MPa.

Comparative Study of Bisection, Newton, Horner’s Method for Solving Nonlinear Equation

The Bisection, Newton and Horner’s method are used to compare the efficiency to solve nonlinear function such as trigonometric, exponential, logarithmic and cubic polynomial function. Although these methods are considered as alternative, the methods also possess error compared to the exact value. The efficiency is measured by the error produced at the fixed iteration. The methods are converted into C language and executed by using maple 18.

Calibration of Dial Indicator Using Calibration Tester with JIS B 7503 Standard

The measurement process is the most important part of the production process in the industrial world. Obtaining good measurement results can not be separated from using measuring instruments that are always maintained. Subsequence, the maintenance of calibration procedures must be carried out periodically based on a predetermined time limit. The calibration process is an activity to compare standard quantities between measuring instruments and testers that are in accordance with the measuring instrument and carried out periodically. The implementation of the calibration process often has generates an uneven value where this value is better known as the uncertainty value. This research objective is to determine the uncertainty value of the measuring instrument of a dial indicator using the JIS B 7503 Standard. The calibration can control the quality of the equipment used, and can show whether the tool is feasible or not to be used.

Coalbed Methane As a New Source of Energy in Indonesia and Some Developed Countries; A Review

The decrease in conventional energy sources followed by the world's energy demand as well as mounting concern about climate change, the countries are competing to get new sources of environmentally friendly energy with large reserves. The utilization of CBM as a new energy is an option because of its huge reserves, more environmentally friendly than traditional fossil energy (CBM emissions are 0.39 tones/MWh) and energy efficiency equivalent to natural gas. Indonesia has huge CBM reserves (400 TCF) but has not been utilize optimally due to technological problems, government regulations, large investments and others. This issues plus geographical constraints also occurs in countries with huge CBMs resource such as Russia (450 TCF) and China (700 TCF). Meanwhile, USA (500 TCF) and Australia (500 TCF) already have more established rules and technology. It is necessary to conduct a comparative study from each country according to the applicable regulations to accelerate the utilization of CBM.