ASEAN Journal of Systems Engineering
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ENERGY SYSTEM DESIGN IN PACITAN REGENCY-EAST JAVA PROVINCE
Full text linkPlanning the construction of renewable energy plants in Pacitan district addresses the increasing electricity needs every year. Pacitan Regency is located on the coast with natural conditions in most of the mountains; there is a lot of renewable energy potentials such as water, wind and sunlight. Based on data from the central statistics agency of Pacitan district with the population increased by 0.18%/year. The energy system planning in this study allocates 70% of renewable energy generation and 30% of fossil plants by 2030.Projected availability of steam power plants with installed capacity of 2 x 315 MW, power capable of 560 MW. The distribution of renewable energy power plants is spread in the Pacitan area with hydroelectric power plants with a total target of at least 412 MW by 2025 and Pump Storage power plants with a total target of at least 1000 MW by 2025. Solar power plants have the potential of intensity radiation 4300 Wh/m2; the average air temperature is 32.5 0C and Solar Radiation 38.71%. Electricity generation waste power with a total target capacity of at least 84 MW. Wind potential with an average speed of 9 m/s. By 2030, the population of Pacitan district will reach 566,413 people, with an energy consumption of 843.85 kWh/capita; the demand required is 187,613 Mwh. By reducing the use of power plants from 100% to 30% can reduce CO^2 emissions to 125,419,390,667 Tons
SIMULATION MODEL DEVELOPMENT FOR FIRE WATER PIPING NETWORK WITH NEWTON-RAPHSON ITERATION
Full text linkThe oil and gas industry is an industry that possesses various risks. The most significant risk in this sector is fire. To support the oil and gas production activities, it is necessary to install permanent and non-permanent fire extinguishers to prevent and deal with fire accidents. The firewater network system has a role in supplying flow rates with a certain pressure to protect the production process in a fire. The flow rate and pressure must be able to preserve the process area. Therefore the performance of firewater network system must be monitored. Over time, the performance degradation of the firewater network system is unavoidable. This decrease is due to scaling or leak minor at pipe and the decreasing performance of the diesel fire pump.This research aims to create a model of simulation fire water network system using newton-raphson iteration. The simulation model that is formed will be used to vary the flow rate against pressure. Based on iteration show the flow rate at platform 4 is 198.9 m3/h. The discharge variation is carried out to see the pressure on platform 4, the variation of the discharge of 2,000 m3/h gives a pressure of 150.45 psig, the variation of the discharge of 1,500 m3/h gives a pressure of 130.85 psig, and the variation of the discharge of 500 m3/h gives a pressure of 24.26 psig. The results of the discharge variation are used to see the performance of the fire water network system. Performance with a discharge of 2,000 m3/h decreased by 9.74%, and performance with a discharge of 1,000 m3/h decreased by 8.81%
UTILIZATION OF OIL PALM EMPTY FRUIT BUNCHES AS MULCH IN COMMUNITY OWNED OIL PALM PLANTATIONS (CASE STUDY IN SIMARDONA VILLAGE, NORTH SUMATRA)
Full text linkSolid Waste Oil Palm Empty Fruit Bunches have high nutrients, which significantly determine oil palm growth rate and production. Each nutrient has its role and can show specific symptoms in plants if their availability in the soil is very lacking. Dry oil palm land and the difficulty of procuring chemical fertilizers for the community that owns oil palm plantations in Simardona Village are expected to be overcome by the use of OPEFB. Utilization of Oil Palm Empty Bunches as Mulch was done manually in 4 research scenarios. Scenario 1 uses 2 kg of chemical fertilizers plus 250 kg of OPEFB, scenario 2 uses 2 kg of chemical fertilizers plus 300 kg of OPEFB, scenario 3 uses 2 kg of chemical fertilizers plus 350 kg of OPEFB, and scenario 4 uses 2 kg of chemical fertilizers plus 400 kg of OPEFB.The results obtained are that the humidity or moisture has increased from a value of 1 to 4. Therefore, it can be seen that the effect obtained from the use of more OPEFB makes the humidity higher. The calculation of the total cost of using OPOPEFB as mulch is obtained from the sum of the price of chemical fertilizers, the price of OPOPEFB, and workers' wages. The total cost after utilization of TKKS is IDR854,000.00. The total cost before using TKKS was IDR441,600,000. The difference in costs before and after the utilization of TKKS is IDR412,400.00, an increase in costs of 48%. The cost of using TKKS is higher than before using TKKS. The total harvest obtained before the use of OPEFB is 2,000 kg or IDR4,900,000. Meanwhile, after using OPEFB, the total yield obtained was 2,700 kg or IDR6,615,000. Production income increased by 26%
OPTIMIZATION AND TECHNO ECONOMIC STUDY OF PLASTIC WASTE BENEFICIATION WITH PRODUCTION SIMULATION APPROACH CASE STUDY AT CV. PANDU KENCANA JOMBANG, EAST JAVA
Full text linkThe problem of plastic waste is getting more and more worrying day by day. Meanwhile, the industrial demand for plastics is also increasing. So we need a recycling business that can bridge this. Plastic waste in the environment can be decomposed, and the industry fulfills plastic needs at low prices. This study aims to analyze and optimize the business of recycling plastic waste into plastic ore to reduce the amount of plastic waste in the environment and obtain material benefits. The research method used is a case study in a plastic waste processing company with the collection of data needed to determine the formulation of the problem so that a mathematical model of linear equations can be formed, which then, through production simulations, will be obtained optimization. The results are then analyzed with a techno-economic study to determine the feasibility of the business.After optimization of production from simulations based on a mathematical model of linear equations, if the company wants to get maximum profit, then the company must produce PP Black A of 1022.73 kg, PP Black B of 852.27 kg, PP Gray of 625 kg. Meanwhile, PP Gray Jumbo should not be produced. Based on the techno-economic study, the feasibility analysis before optimization was obtained as ROIa=23.40%, ROIb=23.24%, POTa=2.99 years, POTb=3 years, BEP=36.07%, SDP=23.98% LANG=4.1, DCFRR=18.8 %. Then the feasibility analysis after optimization is ROIa=29.88%, ROIb=29.73%, POTa=2.5 years, POTb=2.51 years, BEP=31.03%, SDP=20.63%, LANG=4.1, DCFRR=24.85%
STUDY OF GREYWATER REUSE SYSTEM WITH LOCAL MATERIAL FILTER
Full text linkThe abundant supply of greywater as domestic waste becomes an opportunity for further processing and can be reused as water (reuse) instead of consumption (eating and drinking). Every day as much as 60% of greywater is wasted as a by-product of human consumption. Filtration using local media becomes the treatment option. The size of the greywater particles ranges from 10 μm to 100 μm. The filter media size is made into two levels i.e., 80 mesh (active zeolite and charcoal) and mesh 18 (active sand) to filter particles by ten μm and mesh 14 (zeolite and activated charcoal) and mesh 10 (activated sand) to filter the particle size of 53 μm. The combination of filter media thickness in three experiments took one of the filter media to be used in each experiment. Each experiment will be used one filter media with a thickness of 50 cm and 25 cm each for supporting filter media, with a total media thickness of 100 cm.All of the above become independent variables in research. While the dependent variable is water quality standard in accordance PP. 82 the year 2001 with the main parameters are BOD, COD, TSS, pH, and detergent. The flow rate is set at 24.55 ml / m2 min. Besides the quality standard, the research still refers to cost efficiency and processing time (filtration). All variables consist of 6 filters that give different results; in laboratory test control, only pH fulfills the quality standard of PP. 82 of 2001. This study provides the best combination of filter media in A filter with BOD presentation: 82%, COD: 85%, TSS: 99%, and 98% detergent with the fastest contact time of 2700 seconds. The resulting effluent placed TSS and detergent parameters below the quality standard threshold with TSS values ranging from 15-24 mg / l, while the detergent content was in the range of 14.828 - 42.37 mg / l
POTENTIAL STUDY OF PHOTOVOLTAIC POWER STATIONS TO MEET ENERGY NEEDS OF FUEL CELL UNITS IN BARU PANDANSIMO BARU BEACH OF BANTUL, YOGYAKARTA
No full textEnergy needs are increasing rapidly along with population growth, increasing population activity, and massive development in technology. However, a current energy source is mainly from fossil energy. This condition is inversely proportional to fossil energy stock, decreasing year by year as a natural condition of non-renewable energy. On the other hand, fossil energy damages the environment by its pollution, such as deforestation and air and atmospheric pollution in the form of greenhouse gas emissions. For this reason, the world needs another source of energy that could replace fossil energy as a source and is also environmentally friendly. New and renewable energy could be the solution.Indonesia has plenty amount of new and renewable energy potential. However, renewable energy is weather-dependent, thus requiring storage technology to store the energy. The current common storage technology is battery technology. This technology has some weaknesses: limited capacity, high cost, less flexibility, expensive, and short lifetime. Another storage technology with high flexibility, easy transport, high amount capacity, long lifetime, and wide usage is needed. Hydrogen storage appears to meet all these requirements.This study aimed to calculate the optimum potential of photovoltaic power stations at Baru Pandansimo Beach of Bantul, Yogyakarta, as an energy source to produce hydrogen as a storage energy system. The simulations are done using HOMER software were carried out in three photovoltaic power station scenarios: fixed-tilt, single-axis tracker, and dual-axis tracker, and showed that the fixed-tilt photovoltaic power station scenario is the most optimal design and architecture. With total capacity reaching 7.8 MWp potential to be built at Baru Pandansimo, it could generate 11,657,704 KWh/year electrical energy with an NPC value of USD 8.29 M, and a COE of 0.0420 USD/KWh. This electrical energy could produce 213,288.06 kilograms of H2 at a 2.3 USD/kg production cost.
PRODUCT CLUSTERING ANALYSIS ON THE MARKETPLACE USING K-MEANS APPROACH (CASE STUDY: SHOPEE)
Full text linkThe business world has experienced a paradigm shift towards a more modern concept. Many business processes are carried out through the internet or commonly known as e-commerce, by utilizing a platform known as Marketplace. One of the marketplaces that are quite well-known and in great demand in Indonesia is Shopee. The high online shopping activity in the current marketplace indirectly encourages business actors to understand the online market. However, one of the obstacles that are quite often faced by sellers, especially new sellers who are starting to enter the digital realm, is the emergence of confusion in the selection of products to be sold due to a lack of information regarding the demand for what products are in demand in the market.The process of searching for information related to the demand for products of interest is carried out through clustering analysis to find out the groups of products that are of interest to those that are less attractive to the public. The data used is product data from 6 categories in the Shopee market which was taken using web scraping techniques. The clustering processes used the K-means approach by determining the number of K and the optimal center point through the calculation of Sum Square Error (SSE) by looking at the elbow graph. The final results show the optimal number of K clusters that are different in each category, namely in category women’s clothing, men’s clothing, and electronics are at K=4 then for products in the category of Muslim fashion, care & beauty and household appliances are at K=3. Based on the validation results using the Davies Bouldin Index, values were obtained in6 categories, namely 0.391, 0.438, 0.414, 0.357, 0.387, and 0.377, which means that the cluster structure and the level of information formed in each category using the K-Means method is quite good
COMPARISON OF ABILITY PO4 AND NH3 DECREASE IN HOSPITAL WASTEWATER USING PHYTOREMEDIATION BATCH WITH EICHHORNIA CRASSIPES AND AZOLLA PINATA
Full text linkHospital operations have the potential to produce waste, especially wastewater, which can cause environmental pollution. Therefore it is necessary to control the disposal of liquid waste that is discharged into the environment. It is required to reduce the pollution of wastewater management is excellent and appropriate legislation. Research methodology starts from the data observed laboratory test results for samples of hospital wastewater. From these data, it is known that the levels of phosphate and ammonia still do not meet quality standards following the Decree of the Minister of Environment No. 58 of 1995 regarding effluent standards for hospitals. Further research is limited only focused on decreased levels of phosphate and ammonia in hospital wastewater.Data research includes a phosphate concentration of outlets as a pilot study. The subsequent wastewater will be divided into seven-bath, three-bath containing wastewater and water hyacinth plants with a density different in each basin ie density of 60 mg/cm2, 90 mg/cm2, and 120 mg/cm2, three baths containing hospital wastewater and Azolla plant density of each tub 60 mg/cm2, 90 mg/cm2, 120 mg/cm2, and the control tanks containing wastewater without a given crop. Based on the results obtained, phosphate levels can meet the fastest quality standards for four days on a tub of hospital wastewater and water hyacinth with a density of 120 mg/cm2 and all of a tub of wastewater hospitals and Azolla. For ammonia takes the fastest four days, this happens in a tub filled with water hospital waste, and water hyacinth with a density of 120 mg/cm2 and the entire tub of wastewater hospitals and Azolla
PERFORMANCE OF ROOFTOP PHOTOVOLTAIC SYSTEM WITH ADDITIONAL WATER COOLING SYSTEM
Full text linkImproving solar power plant performance is considered quite important for existing and prospective users of rooftop solar power plants in Indonesia due to its unattractive economic value. One of the efforts to optimize the performance is the application of an additional cooling system on the plant's photovoltaic module. This study aimed to determine the effectiveness of temperature reduction of the applied cooling system on solar panel productivity. The research was performed on the existing rooftop solar power plant with a capacity of 3 kWp, located in Depok City with coordinates of 6°38'03.40" South Latitude and 106°82'03.49" East Longitude.The results showed that the additional water cooling system with a closed-loop pumping method on the installed solar module’s entire surface could improve the rooftop solar power plant performance with an average production increase of 15.7% in 7 days of study. Meanwhile, from an economic point of view, this cooling system installation payback period was 2 years.
AN IMPROVEMENT IN THE MOBILITY OF MANGKUBUMI YOGYAKARTA AREA WITH URBAN MODELING INTERFACE SIMULATION
Full text linkMangkubumi Yogyakarta area is not only a strategic area in the city of Yogyakarta, which lies on the axis of philosophy, forming the spatial structure of the city of Yogyakarta but also a compact area with building facilities that function as offices, education, trade/services, worship, and settlements. The discourse of developing the site has long been announced as a supporting area for Malioboro tourism, and Tugu station developed into TOD (Transit Oriented Development), among others. In 2019, the research, development research aiming to find an area model supporting the realization of the maximum mobility value was carried out in Mangkubumi area to measure mobility levels in the area, and the results of this study found that the rate of mobility and walkability was 76 and 79 respectively.The method used was a simulation of the Urban Modeling Interface (UMI) software to measure the value of mobility in regional models. The research step used area modeling, which was carried out in eight models. After the simulation, the best model with the highest mobility value was selected. The eight models were made based on the four road network patterns of Morlok’s idea (Grid, Spiral, Hexagonal, and Delta), each of which was designed to be two types, namely, type A and type B. Type A was a form of modeling by conducting interventions focused on residential building facilities, and type B was focused on all area building facilities. The finding of this research was that the best road network pattern was the Delta network pattern after intervening in all building facilities and after carrying out land use by placing residential building facilities at the center of the area and placing other building facilities on edge the area. This simulation resulted in a walkability score of 92 and bike-ability of 92. The score is the highest in the walk score ranking level. A value of 92 means that there are walker's paradise, daily business not requiring a car, and biker's paradise, daily affairs done by cycling