จำนวน Repository ( 7 )

แบบจําลองการวิเคราะห์การไหลของกําลังไฟฟ้า
แบบจําลองการวิเคราะห์การไหลของกําลังไฟฟ้า

his project presents a power flow analysis model for the purpose of studying power flow in a power system model. At present electric power is an important factor driving the country both in industry and transportation. The demand for electric power tends to increase the production is insufficient to meet the demand. Therefore it is necessary to make the most of the energy resources available in the system. An effective system must be analyzed to detect possible errors. A sudden increase or decrease in load in the system may result in inadequate production and distribution efficiency. Therefore this project is presented for the analysis of power flow in a 3 bus 5 bus and 30 bus power system model using a math simulation program. It is divided into 3 case studies: Case 1 power flow under normal conditions Case 2 transmission line disconnection Case 3 adding distributed power generation sources.

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ชุดทอลองการวิเคราะห์การไหลของไฟฟ้าในระบบไฟฟ้ากำลัง
ชุดทอลองการวิเคราะห์การไหลของไฟฟ้าในระบบไฟฟ้ากำลัง

This thesis presents the design and construction of an experiments of the power flow in the power systems. For the operating system of the power flow in the power systems. Comprise with the real power Reactive power Voltage in the power system. To guide the planning and operation of power systems. The results of the experiment to calculate the pressure at various points in the Power loss of system. As well as finding solutions to problems. Occurring in the system such as under voltage or short circuit in the system. This is the basic of stability analysis of power system operation and planning

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สมบัติทางวิศวกรรมของบล็อคปูพื้นคอนกรีตพรุนจากผิวทางแอสฟัลต์เก่านำมาใช้ใหม่โดยการแทนที่มวลรวมหยาบ
สมบัติทางวิศวกรรมของบล็อคปูพื้นคอนกรีตพรุนจากผิวทางแอสฟัลต์เก่านำมาใช้ใหม่โดยการแทนที่มวลรวมหยาบ

This research aimed to study the use of coarse aggregate obtained from removing old recycled asphalt pavement (RAP) in the production of the porous concrete paving block. Crushing and size separation of the coarse aggregate by using standard sieve size by selected the gradation size of the coarse aggregate that passed to sieve size 1/2” and retained on sieve size 3/8” and other that passed to sieve size 3/8” and retained on sieve size No.4 by mixing ratio 50 : 50 of the mass as replaced natural coarse aggregate. Portland cement quantity about 18% and 20% by weight of the aggregate. The water to cement ratio was 0.30 and 0.35 respectively. Compressive strength flexural strength and water permeability were investigated. The results showed that the cement content and water to cement ratio was influenced the strength properties and water permeability rate of the porous concrete paving block. The porous concrete paving block mixed with higher cement content (20%) had the compressive strength at the age of 28 days increased by 16-24% when compared with lower cement content (18%). On the other hand the water permeability rate decreased by 5.1-8.1%.

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การสร้างและหาประสิทธิภาพชุดทดลองเพื่อพัฒนาทักษะการเรียนรู้วิชากลศาสตร์ของไหล
การสร้างและหาประสิทธิภาพชุดทดลองเพื่อพัฒนาทักษะการเรียนรู้วิชากลศาสตร์ของไหล

The Experiment Set of Pipe’s Loss Flow is intended to design and create a trial version of the loss of flow in the pipe and the objective is to find the speed of the flow through the pipe by reading the difference of pressure The Experiment Set of Pipe’s Loss Flow is equipped with the structure of a width of 86 centimeters long 120 cm high 171 centimeters and have a trial version which contains the water pump the Centrifugal pump size 0.5 HP 220 – 240 volt 1 set. The tanks for trial 28 liters

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An experimental study flow capability of defined different thickness of  semi  crystalline thermoplastics of  flow path ratio
An experimental study flow capability of defined different thickness of semi crystalline thermoplastics of flow path ratio

The design of plastic injection mold requires precision and efficiency of the injection. Therefore mold design engineers need to determine the size location and number of the gates to fit the length of the plastic flow in the work piece so that when the injection mold is built they’ll get the complete and specified specimen. This research was conducted to study the influence of injection flow channel thickness affects the flow index. Poly ethylene high density High density polyethylene HDPE was used in the experiments. The flow of plastic was Spiral Test according to ASTM: D 3123-94 with rectangular cross-sectional area of 6 mm. wide 6 mm. pitch. It was found that the thickness of the flow channel at 0.51.01.5 and 2.0 mm. which has the best flow rates at the best injection speed at 25% the injection pressure at 30% and the flow distance of 52 116 238 and 299 mm respectively with the plastic melting temperature between 190 C and 220 C.

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