Jurnal POLIMESIN最新文献

{"title":"Web-based low–cost rooftop solar power plant for household application","authors":"A. Aditya, Nur Rani Alham","doi":"10.30811/jpl.v21i2.3471","DOIUrl":"https://doi.org/10.30811/jpl.v21i2.3471","url":null,"abstract":"The global warming issue has been resolved through Sustainable Development Goals (SDGs) agreed upon by the world. One of the SDGs is affordable and clean energy. Green energy, such as solar energy, is a solution to realize it. Solar energy has massive potential as renewable energy in tropical countries. On the one side, solar energy is an excellent renewable energy. On the other side, solar energy has a low maturity level of technology. It is proven by the extravagant investment cost of building a solar power plant. Indonesia has an investment cost of up to 1200 USD per kWh, which is unsuitable for household applications. This investment cost will continue to be higher when it uses an IoT system for monitoring or managing the solar power plant. The low-cost solar power plant was designed using a hybrid system to reduce the investment cost. The industrial standard components include ACS712 as a current sensor, ZMPT101B as an AC voltage sensor, and ESP32 as a data processor and IoT module. The Blynk platform, connected to ESP32, is a web-based monitoring system. The success parameter consists of the DC voltage and current from battery and solar panel, AC voltage and current from single phase inverter. The low-cost solar power plant is designed in a 1.92 kWh battery pack with 1 kWh of AC continuous output power with total investment cost 1080 USD. The proposed solar power plant design decreases an investment cost by 14.29% up to 50.00 % per kWh.","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127856525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Implementation of rapid entire body assessment and anthropometry methods in conveyor design","authors":"N. Panjaitan, Felica Felica","doi":"10.30811/jpl.v21i2.3119","DOIUrl":"https://doi.org/10.30811/jpl.v21i2.3119","url":null,"abstract":"The packaging station is one of the stations needed to produce the product. The workers in this station are still doing the process manually. The packaging station has several processes, namely the weighing process, the sewing process, and the moving process of the finished product by manually lofting the sack from the sewing machine to the pallet. The moving process has three activities holding, lifting, and moving. Workers who work manually often complain of pain felt while working, so they are at risk of experiencing musculoskeletal disorders. Accordingly, it is important to analyse the work posture to determine whether improvements must be made. The Rapid Entire Body Map (REBA) analyses the work position. Analysis of work posture is moving the product. The REBA method's posture assessment results are 8 for holding, 9 for lifting, and 10 for moving. From the results, it can be categorized as a high-risk level, and immediate improvements are needed. The improvements were made by designing a conveyor from the sewing machine to the pallet using the Anthropometric method with dimensions of 100cm, width of 65cm, and height of 113cm.","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"04 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124509898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Implementation of fuzzy logic control for the automation of diesel engine cooling systems","authors":"R. Randis","doi":"10.30811/jpl.v21i2.3359","DOIUrl":"https://doi.org/10.30811/jpl.v21i2.3359","url":null,"abstract":"Conventional cooling systems on four-wheeled vehicles generally use a cooling fan driven by the crankshaft through pulleys and a belt (V-belt), causing the wastage of fuel in the vehicle. This study aims to design and implement fuzzy logic control on a prototype of an automatic cooling system for a diesel engine. The tool's design uses the experimental method, uses Arduino as a microcontroller that functions as a data processing center, with inputs of two temperature sensors and a DC motor as output to rotate the fan, and fuzzy logic control methods as an automatic control system. The research results show that this tool can operate automatically according to the engine temperature, so it is expected to produce greater effectiveness and efficiency. Measurements on each component have been carried out and show satisfactory results, testing on the temperature sensor shows a small error. Comprehensive testing of the tool shows good performance, including the PWM output to adjust the rotational speed of the fan motor so that the system can be used properly. This research will help create a prototype of an automatic cooling system for a diesel engine cooling system so that it can be developed to reveal better fuel efficiency in the future.","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121337628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of CFD simulation model of earth air heat exchanger for space cooling of a 36 M2 house in tropical climate Banda Aceh, Indonesia","authors":"Sarwo Edhy, K. Khairil","doi":"10.30811/jpl.v21i2.3692","DOIUrl":"https://doi.org/10.30811/jpl.v21i2.3692","url":null,"abstract":"The global warming makes the ambient temperature hotter and greater efforts are made to reach a comfortable temperature. The continuous use of air conditioners that consume electricity is also unsustainable for the surrounding environment. Several studies on thermal comfort have been conducted by various researchers. Earth-air heat exchangers (EAHE) with air-working fluids can be used as a passive contribution to reduce building energy requirements for heating or cooling purposes. It should be noted that there is very little information in the literature on the development of a CFD (Computational Fluid Dynamic) simulation model of an EAHE for space cooling of a 36 m2 house in a tropical climate, such as Banda Aceh, Indonesia. Therefore, this study aims to examine the performance of EAHE with several variations in design parameters, such as pipe length, pipe diameter, number of pipe bends, and the type of soil where the EAHE is installed, as well as the thermal regime of a 36 m2 house either with or without the use of EAHE. The simulation in this study was conducted with CFD ANSYS Fluent software. The inlet air temperature of EAHE was set to be the same as the ambient air temperature, namely 31.4oC. The simulation results reveal that for variations in pipe length, the highest drop in outlet air temperature was yielded by the 47 m pipe length, which is 26.8°C. In which an increase in pipe length causes a decrease in air outlet temperature. The variation in pipe diameter does not significantly affect the outlet air temperature. Where the average air temperature drop at the EAHE exit is 0.046oC. The variation in number of turns shows that the drop in outlet air temperature is identical, namely 28.2°C, despite the fact that their pressure drop values are different. In addition, it was found that the performance of EAHE buried under different types of soil is distinct. The highest drop in outlet air temperature was generated when the EAHE was buried in silty soil, namely 26.1°C. A case study on a 36 m2 house shows that the utilization an underground heat exchanger can reduce the house’s indoor temperature by 2°C, with an average house temperature of 30.4°C compared to that with a natural ventilation.","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133911723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of variations in electric load on the performance of a 3 kW Micro Hydro Power Plant using an undershot waterwheel","authors":"Y. Herlambang","doi":"10.30811/jpl.v21i2.3195","DOIUrl":"https://doi.org/10.30811/jpl.v21i2.3195","url":null,"abstract":"The purpose of this study is to evaluate the performance of the undershot water wheel type with a 3 kW generator as a micro-hydro power plant that generates electricity by utilizing water power from paddy fields and local resources. Where the irrigation canal can irrigate approximately 247 hectares of rice fields during the dry season. The research technique employs a waterwheel with a 1.1-meter diameter, 12 blades with a 70-centimeter blade arm length, and a 2-inch shaft diameter. The transmission system employs a chain to increase rotation and decrease slippage and rotation losses, making it simpler to drive the generator to produce electricity. The test was conducted by varying the lamp capacity from 100 W to 800 W while maintaining constant water discharge and flow. Water discharge, water head, generator rotation, electric current traveling through the load, and output voltage are the test parameters. With a discharge of 0.476 m3/s, a water flow speed of 3.229 m/s, a waterwheel rotation of 42.39 rpm, and electric power of 207 W, the utmost efficiency value of 8.35% was determined.","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123666055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Trends, relationship, and model of selected service sector workers in Malaysia: Physiological responses of mental workload and mental fatigue during performing real-time tasks","authors":"Nurul Izzah Abd Rahman","doi":"10.30811/jpl.v21i2.3310","DOIUrl":"https://doi.org/10.30811/jpl.v21i2.3310","url":null,"abstract":"Service sector is a job that is considered exposed to high mental demand. There is lack of technique to measure issues related to the mental workload and mental fatigue levels among workers. Moreover, no studies have yet developed a model to predict mental fatigue especially for service sector workers. It is necessary to investigate mental workload and mental fatigue in real time working activities. The main purpose of this study was to identify the trends and relationship between mental workload and mental fatigue level among service sector workers. Ten participants with a mean age of 35.00±8.62 (SD) years took part in the study. Two experiments in Without Rest (WoR) and With Rest (WR) segments involving data entry and arithmetic tasks were conducted. Physiological measures using Electroencephalogram (EEG), Electrooculogram (EOG) and heart rate (HR) were assessed while participants were performing the tasks. The result shows that EEG alpha signal was significantly higher at the end of WR compared to WoR segment (p<0.05). Comparison between WoR and WR segments for each task show that HR of WR tasks were significantly lower in all tasks (p<0.05). This study developed seven mental workload and mental fatigue conceptual models with strong variables correlations (r>0.05) to evaluate the variability of both parts of two types of activities, namely, data entry and arithmetic tasks. The findings highlighted that validated parameters and methods for mental fatigue and mental workload measures are brain signals and heart rate monitoring, and task performance measure. Significant findings of the study could be as a reference for organizations to plan and manage resources by optimizing mental workload condition and minimizing mental fatigue occurrence","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123113886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical simulation analysis of structural strength of portable skid for storage tank with 50.000 liter capacity","authors":"Muslimin Al Masta","doi":"10.30811/jpl.v21i2.3501","DOIUrl":"https://doi.org/10.30811/jpl.v21i2.3501","url":null,"abstract":"A storage tank is a container used to store fluids such as fuel, water, and chemical. Skid construction is implemented to make the tank smoothly transported while operated, such as in the mining field. Skids were assembled on the storage tank's base to sit on the ground. This study aims to design and analyze a portable skid storage tank to resist the load of 50,000 liters (392 kN) of fuel and 45 kN of mass of construction itself statically. The skid's main components are a wear plate, pad eye, and seamless pipes of schedule 40 for support, central, and base. All structure's material is 250 MPa yield strength of ASTM 36 low carbon steel. Manual calculations and simulation analysis were implemented to review the skid structure's maximum stress and safety factor. The examination included pipe support, central pipe, and pad eye. Based on the result, the highest stress of 157.88 MPa by ANSYS and 148.07 MPa by manual calculation. Therefore, the construction is safely based on the Tresca and Von Mises criteria.","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131583554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design of photovoltaic/thermal (PV/T) with heat pipes as a heat transfer medium used for water heater","authors":"R. I. Mainil","doi":"10.30811/jpl.v21i2.3298","DOIUrl":"https://doi.org/10.30811/jpl.v21i2.3298","url":null,"abstract":"One of the main obstacles for developers and users of photovoltaic (PV) modules is that the module temperature is too high due to high solar radiation and a higher ambient temperature, which reduces PV efficiency. A photovoltaic/thermal (PV/T) system is a technique developed for absorbing heat, that combines PV with a solar thermal collector (STC). In this research, heat pipes are used as the heat transfer medium. This paper aims to design a PV/T system for water heating and examines the thermal performance and water temperature that can be achieved by PV/T. In designing PV/T, the method used is to estimate the intensity of solar radiation and determine the size of the thermal collector, thermal insulation, type of working fluid, and heat pipe filling ratio. The PV/T thermal performance is also tested after the system design has been built. The design parameters that have been obtained are the PV area of 0.67 m2 and the volume of heated water of 20 liters. This design proposes water as the working fluid of the heat pipe with a filling ratio of 10%. The system performance indicates that PV/T could heat the water to 50.9 °C with energy absorbed by the water of 1.85 MJ, and the maximum thermal efficiency of PV/T is 27.14%. The results show that PV/T has a very promising future in terms of its ability to use heat energy and can be further developed for future research so that it can encourage people to use environmentally friendly renewable energy","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125689839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A study on Flame Characteristics Premixed Burning by Giving Magnetic Field Induction","authors":"Deny tomy andrianto","doi":"10.30811/jpl.v21i2.3497","DOIUrl":"https://doi.org/10.30811/jpl.v21i2.3497","url":null,"abstract":"This study aims to compare the effect of magnetic field induction on the characteristics of the fire resulting from the combustion of premixed biodiesel calophyllum inophyllum . Further research on premixed combustion flames due to magnetic field induction. As time goes by, petroleum is currently running low, therefore alternative biofuels are needed. One type of non-food vegetable oil is Jatropha and calophyllum inophyllum oil, besides not being consumed, it can be processed into biodiesel as fuel. To get a more effective and efficient flame, you can apply a magnetic field effect to the fire, especially in terms of the burning rate of the fire. The experimental research method is to heat calophyllum inophyllum biodiesel until it is in the form of steam, then flow it to the burner which will then be given air which is controlled by the flow mass. Then the fire is ignited and the mass of the air flow is increased until the fire is lifted until it is extinguished. Two magnets are placed between the burners by varying the direction of the magnetic field N-S, N-N and the results of this study are the shape of the flame. The resulting fire is more transparent, clearer and more visible. The direction of the N-S magnetic field causes the temperature to be higher than the direction of the N-N magnetic field. The high and low of the flame is affected by the direction of the magnetic field, the stronger the N-S magnetic field. The magnetic field can affect the burning speed of the biodiesel flame. In a poor mixture (ϕ <1) in the presence of magnetic influence, the rate of fire is lower without the influence of a magnetic field, but in a rich mixture (ϕ > 1) in the presence of a magnetic influence, the rate of fire is higher than without the influence of a magnetic field. This is due to the magnetic influence that induces oxygen. Oxygen is paramagnetic, so it can be attracted by magnetic fields.","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"314 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122426780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Penggunaan material berubah fasa sebagai penyimpan energi termal pada bangunan gedung","authors":"H. Umar","doi":"10.30811/jpl.v18i2.1832","DOIUrl":"https://doi.org/10.30811/jpl.v18i2.1832","url":null,"abstract":"The energy consumption of the world building sector reaches 30% of overall energy consumption and accounts for one third of greenhouse gas emissions worldwide. Thermal energy storage is a simple and effective technique to be applied to buildings to improve building energy efficiency, and is expected to reduce the environmental impacts associated with energy use. Thermal storage by utilizing phase change material (PCM) is the most promising technique because of its high energy storage capability and small temperature changes. The combination of building materials and PCM is an efficient way to increase the thermal energy storage capacity of building components for the purpose of storing thermal energy directly in buildings. In this study the results of testing the use of beeswax as a phase change material in building concrete are given. The test results of concrete equipped with beeswax as PCM decreased the strength of the concrete but on the other hand it was able to absorb and store heat energy. The results of application analysis in buildings are able to reduce indoor cooling loads.","PeriodicalId":166128,"journal":{"name":"Jurnal POLIMESIN","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129618897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}