JURNAL TERBARU

ANALISA EFISIENSI ROOFTOP SOLAR COPRA DRYER DENGAN SUSUNAN KOLEKTOR SECARA SERI

Abstract: Rooftop solar copra dryer tool is an instrument used for drying copra with capacity ± 40 kg, for one drying. The purpose of this research is to see how to efficiency drying in a series connectivity on copra process of drying. Using the dryer solar can exsiccate drain agricultural products. Where the work plase, sunlight absorbed or strored through solar collectors, heat will come from the collector come into a system of air flow to the piping system and forward to the drying. Design tool dryer aims to exsiccate copra of the water is decreased from 52.68 % until 5-6 %. Medium dryer is the heat produced by the capture of the sun and distributed for ciblyin to the drying chamber they would be used for drying copra. After doing research with the experimental method to directly observe and measure the way things are done in the dryer and then do the processing and evaluation of test data. From the results of tests and calculations, drying wits series to get a final moisture content of the materiall is achieved after 25 hours of drying by using a tool maker Rooftop wits 5.97 %. Final moisture content of the materiall is achieved after 25 hours of drying with direct drying wits 24%. Rooftop solar copra dryer appliance is more Effective and Efficient. Un contaminated by air environment (dust, sand, vermin and its other).
Key words: Rooftop solar copra dryer, solar collectors, the mass flow rate of air

PURIFIKASI BIOGAS SISTEM KONTINYU MENGGUNAKAN ZEOLIT

ABSTRACT: The continued development of the technology industry and the rapid depletion of petroleum energy the need for alternative sources of renewable energy to be a very important consideration. Biogas is a renewable energy that has great potential as an alternative energy. The content consists of CH4 biogas as fuel around 50-80% and CO2 as an impurity around 27-45%. With the CO2 gas can affect the purity of CH4 in biogas womb. Therefore, to get the maximum quality of biogas purification necessary. The research was done by making purification equipment (purifier) with zeolite granular solid filler mounted on a biogas digester system continue. Purification processes varying on zeolite layer that fills the purifier is 1, 2, 3, 4, and 5 layer. All walks take a purification process for 60 minutes and observed every 15 minutes. The results showed that the increasing time between biogas purification with zeolite, the CO2 levels tend to decline with the lowest percentage of 21.3% and CH4 levels increase with the highest percentage of 74.7%. This is due to the increasing time of purification, CO2 absorbed in the zeolite structure more and more. So with the absorption of CO2 by the zeolite, the resulting levels of CH4 has increased. In addition to the greater number of zeolite layers become increasingly declining CO2 and CH4 levels increase. This is because the more the number of layers of filler, wide contact area between the biogas by zeolite increasingly large that CO2 is absorbed by the zeolite increased.
Keywords: Zeolite, CO2, CH4, purification, biogas continuous system

KEKUATAN TARIK DAN POROSITAS SILINDER AL-MG-SI HASIL DIE CASTING DENGAN VARIASI TEKANAN

ABSTRACT: Tensile strength and porosity of die-casted Aluminum Alloys Al-Mg-Si with various applied pressure were investigated. Al-Mg-Si was melt in the electric induction crucible with temperature of 850 degree Celsius. Melt aluminum was poured in the metallic mould that pre-heated in 150 degree Celsius. Melt aluminum was pressed by the plunger with pressure of 0.1, 10, 30, and 50 MPa and held for 5 minutes. After aluminum was solidified, specimens for tensile strength and porosity test were machined. Tensile strength, porosity test and microstructure observation were conducted. Results of tensile strength and porosity test show that the higher plunger pressure, porosity becomes lower and tensile strength of specimens to be higher. Maximum tensile strength occurs in the specimens that pressed in 50 MPa. It occurs due to minimum porosity and small grains of microstructure in the specimens.
Keywords: Aluminum, Die casting, Pressure, Tensile Strength, Porosity, Microstructure

PENERAPAN METODE SAVING MATRIX DALAM PENJADWALAN DAN PENENTUAN RUTE DISTRIBUSI PREMIUM DI SPBU KOTA MALANG

ABSTRACT: Several existing problems in PT. Pertamina depot Malang in distributing premium products to the gas station in Malang is the high number of premium demand is not matched by the availability of the number of vehicles as well as sufficient capacity tank trucks, and inconsistencies in the distribution schedule every day, and the lack of a clear standard distribution service. Therefore, this study would like to set up distribution routes and schedules and determine the capacity and number of tank trucks are effective and efficient in order to benefit the company. In this research, the determination of the method of saving a useful matrix to solve the problem of transportation and distribution. Based on calculations using the method of saving matrix, then the distribution of these proposals can be given as many as 16 in the three stages of the delivery so that every gas station will have no shortage of fuel supply. Successfully reduced transportation costs and shortened the distance of 261 km to 259.6 km. In the distribution of premium in Malang PT. Pertamina Depot Malang who initially use 11 tanker trucks capable streamlined into 6 tanks.
Key Words: Saving Matrix, Rute and distribution schedule, transportation cost

PENGARUH KANDUNGAN DAN UKURAN SERBUK GENTENG SOKKA TERHADAP KETAHANAN BAKAR KOMPOSIT GEOPOLIMER

ABSTRACT: The objective of this research is to investigate the effect of particle content and grain size of Sokka roof tile powder on the burning endurance of the composite of Sokka roof tile powder - ripoxy R-802.The materials used were a Sokka roof tile powder (SGS), ripoxy R-802 resin, MEKPO catalyst and P-EX promotor. The Sokka roof tile powder was generated from the rejected Sokka roof tile which was crushed into powder. The powder was sieved to result in three size variances, which were mesh 80 retained in mesh 100 (177μm-149μm), mesh 150 retained in mesh 200 (99μm-74μm), and breaking away from mesh 200 (≤74μm). Prior to getting mixed with the resin, SGS was heated in an oven for 45 minutes in the temperature of 105oC. Afterwards, the powder was mixed with ripoxy R-802 resin for 3 minutes. The variances of SGS content were determined to be 10%, 20%, 30% and 40% composition. Making composite was conducted by press mould. Fixed composites was given post curing treatment in the temperatures of 80oC for 120 minutes. The burning testing on the composite was conducted on the basis of the standard of ASTM D-635. The indicator of burning endurance was determined by the data of time of burning (TOB) and rate of burning (ROB). The TOB resulted from the time of ignition and the ROB resulted from the time of fire propagation time in the composite. The results of this research are as follows: (1) the addition of SGS can improve the burning endurance of the composite of SGS-ripoxy R-802 as indicated by the increase in the TOB but the decrease of ROB due to the addition of the content of SGS; (2) the small size of the particle of SGS can increase the burning endurance of the composite of SGS-ripoxy R-802 as signified by the increase in the TOB but the decrease in the ROB due to the small size of the particle of SGS which breaks away from mesh 200 (≤74μm).

FLUKS TERMAL DALAM POROUS MEDIA SAAT MENGKONDENSASI UAP

ABSTRACT: The aim of present study is to observe behavior of heat fluxes in porous media during it condenses the extracted-moist from a vapor related to its heat- and mass-transfer. This study applies two types of porous media which have difference in thermal conductivity, and it considers various ambient-temperatures. The test is conducted by streaming a laminar saturated vapor over porous glass-beads and alumina-balls media inside a duct, where the outside of the duct is treated by the ambient-temperatures. The vapor with various temperatures is forced tangentially over the upper-face of the media, whereas temperature of bottom of the media is kept to be constant. As for treat-I, the ambient temperatures are maintained at a constant value, hence, temperature ratio of the vapor to the ambient is non-unity. Furthermore, for treat-II, the ambient temperatures are increased with increasing the vapor temperatures such as the temperature ratio of the vapor to the ambient becomes unity. From this study, it can be informed that the heat fluxes on the porous media play a key role on condensing the extracted-moist. However, the gradual increase of the condensate inside the porous media decreases effective thermal conductivity on the bed of alumina balls and glass beads, and it further generates the un-steady heat transfer of the condensation.
Keywords: heat fluxes, thermal conductivity, saturated vapor

ANALISIS PENERAPAN METODE RCM DAN MVSM UNTUK MENINGKATKAN KEANDALAN PADA SISTEM MAINTENANCE (STUDI KASUS PG. X)

ABSTRACT: Maintenance system on milling season is using of preventive and corrective maintenance program. However, implementation of the program is still not guided with adequate SOP (Standart Operation Procedure) especially on a specific areas. Downtime occurring during year 2012 on the season were of 241.83 hours. This impacts to loss of potential profits, labor costs, and production capacity. To cope the problem, the study proposes application of Maintenance Value Stream Mapping (MVSM) supported by Reliability Centered Maintenance method (RCM). RCM consists of FMEA, reliability analysis, and RCM Worksheet. For the reliability analysis this study uses easyfit 5.5 profesional, whereas for the MVSM describes actual activity of the maintenance. Based on the application and analysis, it is known there exist 3 machines that are in critical condition and they show having the highest downtime, namely : Unigrator, cane Carrier I, and Cane Carrier II. The result of this research are SOP for actual activity of maintenance, time interval of maintenance, and tipe of maintenance for the machines.
Key Word: MVSM, RCM, SOP Maintenance, 5S, FMEA, RCM Worksheet

PRODUKSI BROWN’S GAS HASIL ELEKTROLISIS H2O DENGAN KATALIS NAHCO3

ABSTRACT: This research is intended to investigate the effect of NaHCO3 (Natrium Bicarbonate) percentage on the performance of HHO (Brown’s Gas) production using electrolysis method. Performance of HHO production that was observed in this research were electric power that used for HHO production as well as rate and efficiency of HHO production. Electrolysis is decomposition of water molecules (H2O) into hydrogen and oxigen molecules (HHO) using electricity in an electrolite solution. This process takes place when two electrodes (anode and cathode) placed in the water and direct electric current flowed through the system. In this research Natrium Bicarbonate was dissolved in the water to increase the rate of electrolysis process. Percentage of Natrium Bicarbonate was varied from 2,5% – 15%. The results show that electric power that used for HHO production and rate of HHO production were increased with the increasing of Natrium Bicarbonate percentage and reach their maximum value at 12,5% Natrium Bicarbonat. However maximum value for electrolysis efficiency was occurred for Natrium Bicarbonate percentage of 10%.
Keywords: Brown’s Gas, Electrolysis, NaHCO3 (Natrium Bikarbonate), Performance of electrolysis process

INTEGRASI SUPPLIER, PRODUSEN, DAN PELANGGAN PADA UKM KERAMIK DINOYO DENGAN CLOUD COMPUTING

ABSTRACT: Globalization forces company as well as small medium enterprise (SME) to face broader market competition. Ceramics small medium enterprises at Dinoyo, Malang are categorized as popular and competitive SME in Indonesia. Ceramics SME Dinoyo have to do continous improvement in order to win the market. The improvement must do to the entire supply chain, including the order receive or forecast system, the production process, and the delivery process to customer. Supply chain approach will give advantages on the desicion of optimal inventories level, demand fulfillment, and materials to end products quality ensurance. The advantages will be achieved when there is collaboration among echelon of supply chain which consist of supplier, manufacturer / producer, and customer. The collaboration among supplier, producer, and customer needs an information system to integrate all informations from each of them. The integration information system will provide information about stock level or inventory level to supplier. Cloud Computing based Information System is a solution to build a database which gives an easier and faster access for supplier and customer. Cloud computing is a technology using internet service with a virtual server for data maintainance and aplication.This research aims to design software of information system using cloud computing techonolgy to simplify data and information processing for Ceramics SME Dinoyo. The cloud computing aplication integrate information from supplier, producer, and customer by using database sharing. The database sharing by producer facilitates the collaboration between supplier and producer as well as between producer and customer. This research shows that the cloud computing application takes lower cost compare to manual system applied by Ceramics SME Dinoyo.
Keywords: supply chain management, information system management, cloud computing, SME

ANALISA DAN PENERAPAN MODEL MAINTENANCE QUALITY FUNCTION DEPLOYMENT (MQFD) UNTUK MENINGKATKAN KUALITAS SISTEM PEMELIHARAAN MESIN GILINGAN (STUDI KASUS PADA PT.PG.X2 MALANG)

ABSTRACT: Maintenance system is critical because if the maintenance goes well it will be able to guarantee the availability of the mechanical equipment so that the production system will running smoothly. One of the mechanical equipment that most important in the manufacturing especially in the sugar mill is the milling machine. The milling machine should always be in a condition that ready for use. In order to guarantee the availability of the machine, maintenance of a good strategy absolutely must be done. This research used MQFD method whereby this method is an integration between QFD and TPM method. According to Pramod et al., Merging the two methods are expected to improve the quality of maintenance as well as to accommodate the all costumer voices both internal customers and external customers as compared to existing methods of maintenance. The results of this study, it is known that the milling machine maintenance needs to be improved in order to improve the performance of milling machines. As the solution, the steps to be taken are Implementation of routine inspection, Train maintenance staff, Assessing and Improving awareness of the operator and machinist, Utilizing softwares to record and analyze machine components data, Execution Planned Component Replacement and cleaning the machine regularly.
Keywords: Maintenance Quality Function Deployment (MQFD), Total Productive Maintenance (TPM), House of Quality (HOQ), Quality Function Deployment (QFD)
 
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