Effect of Flow Steering Angle Toward the Hydrokinetic Turbine Performance

The kinetic turbine is one of the solutions for use in low-speed river flows ranging from 0.01–2.8 m/s. This kinetic turbine is used as a conversion equipment to convert the water kinetic energy into an electrical energy. The working principle of a kinetic turbine is utilizing and relies on the water kinetic energy. Water flowing into the turbine area will produce a momentum on the turbine blades. This momentum change would then push the turbine blades and finally spin the turbine runner. The aim of research is thedetermination of the effect of water flow steering angle (a) and water flow rate variation in the kinetic turbine performance. This research uses vertical axis kinetic turbines with eight curve blade attached to the turbine runner. The variables used are two values of water flow steering angle, namely 25°and 35°. The water flow rate variation of 30 m3/h, 35 m3/h, 40 m3/h and 45 m3/h. The method used in this study uses a real experimental method. These two variations would then compare with the result of a hydrokinetic turbine performance done on the previous research.The results show that the water flow steering angle a affected the kinetic turbine performance (power, efficiency and torque). From these several water flow steering angle and water flow rate variations, the turbine performance with a 35° water flow steering angle get the highest performance compared with the use of 25° and 14° water flow steering angle. The greater the flow angle and the greater the water flow rate, the greater the torque, power and efficiency. The highest turbine power produced, P=17.5 W, occurs on the 35° water steering angle, and on a Q=45 m3/h water flow rate and on a 80 rpm turbine rotation. While the highest turbine efficiency, h=27 %, occurred on the Q=30 m3/h water flow rate, on a 60 rpm turbine rotation and on a water flow steering angle a=35°. The highest turbine torque, 3.1 Nm, occurs at Q=45 m3/h water flow rate at a maximum turbine braking and on a water steering angle a=35°

Komposit Hibrid Polyester Berpenguat Serbuk Batang Dan Serat Sabut Kelapa

Sawdust coconut trunks of palm trees and fiber coconut coir are two waste materials from the processing of coconuts and coconut tree trunks sawmill waste are plentiful materials can be utilized for producing composites using polyester resins. Both each properties materials as follow polyester resin: liquid in the open air conditions, sawdust coconut and coconut coir fiber properties is lightweight and fragile nature of the polyester adhesive used as a binder (binder) between fiber coconut coir and sawdust coconut palm tree trunks as a filler. The variation volume fraction between the sawdust and coconut trunks of fiber coconut coir in polyester resin influence mechanical properties for each composition of this composite. By comparizing the volume fraction of either polyester, sawdust coconut palm tree trunks and fiber coconut coir (Coir coconut) using tensile test standard ASTM D638-I, and the ASTM D6110 for impact testing. The result of tensile and impact test, obtained that the optimum percentage 30:10 per cent, mean tensile strength on 95.953 N/mm2 , mean elasticity 0,125 % , mean elasticity modulus 768.702 N/mm2, mean absorbed energy 2,679 J and mean impact value 0,068 J/mm2

Upaya Peningkatan Sifat Mekanik Baja Mild Steel Melalui Perbaikan Kualitas Dengan Heat Treatment Annealing Dan Holding TIME Pada Heat Treatment Dengan Taguchi Method

The purpose of this study was to determine the ability of the mechanical tensile strength and hardness and microstructure of the steel material Mild Steel. The electrodes used were a new electrode, the electrode was added calium compound is then heated to 100 °C, 100 ° C and heated electrode. Strong currents are used 75 A, 85 A, and 95 A, for a distance of specimen 3 mm, 4 mm and 5 mm. This study used an experimental methodology and the research conducted in the laboratory. The test results showed that the maximum tensile strength is in the condition of the electrode plus a calium compound and heated at 100 ° C, 95 A current and a distance of 5 mm , with Heat Treatment 20 minutes is 278 N/mm2 . Similarly , for the region of weld metal hardness indicates the optimal hardness using electrodes were added and heated calium compounds 100oC , current 95 A and a distance of 5 mm , with Heat Treatment 20 minutes , which is 185 VHN . HAZ hardness to areas with the same test conditions with Weld Metals, hardness value is 371 VHN

Pengaruh Variasi Diameter Injektor Konvergen Udara Terhadap Fenomena Flooding Dalam Aliran Dua Fase Gas-Cair Berlawanan Arah Pada Pipa Vertikal

One type of multi-phase flow is the flow of gas-liquid two-phase. Two-phase flow is widely used in daily life and industry. One type of two-phase flow is air-liquid two-phase flow in opposite directions vertically. In the two phase flow of air-liquid in the pipe flooding, phenomenon in the opposite direction is a loss, so it should be avoided or restricted. To overcome this problem then we make the air injector to get the air superficial velocity corresponding. The design of injector that with shaped nozzle has varies diameter out. They are 4 mm, 6 mm and 8 mm. These varies diameter out of nozzle will be examined to find which one of the diameter out nozzle that can slow the flooding that can be seen in the most of the parameters such as superficial velocity, air flow and flow patterns. The results of these research showed that the varies d-out that has the ability to handle debit and best superficial velocity in a row is shaped air injector nozzle with diameter out of 8 mm, 6 mm, 4 mm. The greater the air flow and air superficial velocity the faster flooding occurs. Flow pattern before the onset of flooding is annular flow pattern. Flow pattern at the beginning of the flooding was wispy annular. And flow pattern at the time of the total flooding is churn flow pattern

Pengaruh Variasi Sudut Water Injector Berbentuk Diffuser Terhadap Fenomena Flooding Pada Aliran Dua Fase Cair – Udara Vertikal Berlawanan Arah

Flooding phenomenon becomes a looses in countercurrent two-phase flow of air-liquid in vertical pipe. Water injector sattached in to the pipe prevents the looses occur. With the use of water injector, liquid will flow attached to the inside wall of the pipe, so the air will flow freely in the middle of the pipe. New design of water injectors in diffuser shape, will be studied to replace the old annular water injectors. 10 o , 15 o , and 20 o of water injector angle will be varied to find which ones can make slowing down flooding. This Research will seek water injectors with the most slowing down flooding, indicating by it superficial velocity, fluid flow, and flow patterns. Abetter Water injector is in whis have ability to handle higher flow rate and higher superficial velocity. The best water injectors in a row is a water injector with 10 o , 20 of angle

Pengaruh Sudut Pengarah Aliran Dan Jumlah Sudu Radius Berengsel Luar Roda Tunggal Terhadap Kinerja Turbin Kinetik

The aimof this research was to know kinetic turbine performance feat influence onguide angle of the water input flow and the amount of outter radius blade hinged of single wheel. Kinetic turbine was used in this research, it has vertical axes with three guide angle variations of 150, 250, and 350 and also the amount of blades is 8, 10 and 12. The results showed that the guide angle of flow and the amount of blades influence the kinetic turbine performance (power, efficiency, and torque). The guide angle of flow and the amountof blade out hinged radius of single wheel influences the kinetic turbine performance. From several angle variation of guide angle and the amount of blade out hinged radius of single wheel under observation, the turbine performance with guide angle of flow 350 higher than 250 and 150. The performance of 12 blades turbine is higher than turbine with blades of 10 and 8. The higher guides angle the more blades, the higher tangential force, torque, power and efficiency. The maximum performance of kinetic turbine occurs at the guide angle of flow 350, the blades amount 12, revolution 90 rpm, water capacity 50m3/hour and with produced power, efficiency and torque are 21.365 Watt, 33,241 %, and 3.864 N.m respectively

Analisa Dan Penerapan Model Maintenance Quality Function Deployment (MQFD) Untuk Meningkatkan Kualitas Sistem Pemeliharaan Mesin Gilingan (Studi Kasus Pada PT.PG.X2 Malang)

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