Now showing 1 - 10 of 28
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    Low wind speed wind turbine blade design for Thailand
    (2020-08-31) ;
    Saengsuwan, Noppakoon
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    Renewable energy is a reason why this study has been chosen. In this paper focused on an analysis of the characteristics of the wind when the wind turbine blade is encountered using a commercial fluid dynamics solver such as Fluent by selecting the impact angle of 5, -5, 10, 15, 20, -10, -15 and -20 degrees. Aerodynamic characteristics such as lift coefficient, drag coefficient, lift to drag ratio has been evaluated in this study. Fluent simulation results will be compared with the result of the milling airfoil tested in wind tunnel. Our goal is to a construction of wind turbine in low wind speed country like Thailand.
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    Wind Tunnel Model for Natural Wind Velocity
    (2020-10-25)
    Taecharoenwiriyakun, Suriya
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    ;
    At the present time, the demand for energy in Thailand is increasing rapidly. Therefore, improving production efficiency is important in solving energy problems. According to the Alternative Energy and Alternative Energy Development Plan 2015-2036 in Thailand, the objectivity for wind power generation has increased dramatically. For this reason, the research team had the idea to create a wind tunnel with adjustable wind speed to mimic local wind speed in Thailand to be used in designing and analyzing wind turbine blade designs to suit various wind speeds. This can increase the efficiency of the production of energy even more. Wind speed adjustment or the pressure, lift and rotation speed measured can be done by a computer. By applying the PID control theory, it can precisely control the wind speed.
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    Prototype of Chipping and Briquetting Machine for Eucalyptus Wood Processing
    (2025-01-01)
    Phaisalpanumas, Pipat
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    Namboot, Nattarat
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    Chutikan, Damisara
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    Usadornsak, Chartchai
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    Tantitippawan, Naritsak
    This paper presents eucalyptus, versatile plants that can grow well in almost every area of Thailand. In the future, the demand for eucalyptus wood tends to increase both domestically and internationally because eucalyptus wood has become a major raw material in various industries and is also an important source of energy in terms of biomass fuel production. The research team has designed and built a eucalyptus woodchipper and pelletizer prototype. The machine has a width of $1,300 \text{mm}$, a length of 800 mm, and a height of 900 mm. Inside the machine, there are log conveying systems, a shredder, and a pelletizing system. The shredder uses a 2.2 kW gear motor for shredding logs and a set of 23 blades. The conveying system consists of 4 upper and lower conveyors and uses a 0.2 kW gear motor. The speed is controlled by an inverter. The pelletizing system uses a hydraulic system for compression, which has a hydraulic pump motor as the source of pressure. In the prototype pelletizing and baling test, the optimum speed of the conveying machine was set at 5 rpm, the chopping speed at 320 rpm and the baling pressure at 220 $\text{kg} / \text{cm} 2$. The processing of eucalyptus into the form of wood chips reduces the volume of eucalyptus by 46 percent, allowing more logs to be transported at a time and significantly reducing transportation costs. In addition, the creation of new products from eucalyptus processing will help generate more income for eucalyptus farmers than just cutting and selling eucalyptus.
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    Wireless Pressure Measurement Prototype for the Elderly
    (2020-07-01)
    Seangsuwan, Noppakoon
    ;
    This paper presents the wireless pressure measurement prototype for the elderly likely processes data by real time informative collecting, due to parts of feet getting adhesively a joint to other body's organism, such as its eye sights, heart, brain, and lungs. Therefore, pressure steps of movement with adjustable measurements are conductively evaluated a mis-behavioral effect of this puncture, especially on diseases' analysis. In concern with our productive Wireless Measurement Force Sensor is being made for use of helping on feet by Force Sensor Resistor (FSR), consisting of six adjoints as though it collecting such informative ranges when steps. In which of being collaborated with LabView processing via Bluetooth. It could detect the force pressure of sitting, sleeping and walking.
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    Wireless Carbon Monoxide Level Control and Monitoring System
    This paper proposes an online carbon monoxide control and monitoring system. The proposed system comprises an MQ-7 CO gas sensor module, a DHT11 digital temperature and humidity sensor module, an ESP8266 module, and a Relay Module. The ThingSpeak platform is used to create HMI for online monitoring of CO level, temperature, humidity, and status of the ventilation fan. This proposed system can measure CO and monitor all parameters of measurement data, alert users when CO values exceed the set value. In addition, the measured CO values are used to control the ventilation system operation (ON or OFF) to maintain the CO at a non-harmful level. The experiment testing and results with three conditions show that the proposed system can measure and monitor CO level, temperature, and humidity online with satisfying values. The ventilation fan can operate with function as a design procedure and maintain CO at a non-harmful level.
      2
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    Pressure measurement device via a wireless network for the seat cushion
    (2022-01-01) ;
    Hewchaiyapum, C.
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    Seangsuwan, N.
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    Techahongsa, P.
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    This paper presents wireless pressure measuring devices for the seat cushion consisting of an air cushion which reduces the chances of developing a pressure ulcer. A force sensor resistor (FSR sensor) is placed in the position where pressure is most likely to occur. FSR sensor is put under air cushions to help distribute the pressure and reduce the damage which may happen to the sensor. The pressure is applied to the sensors, they will send the data to the microcontroller (Arduino MEGA 2560) and then transmit data via Bluetooth to LabVIEW for display on the monitor screen with the measured pressure range which is divided into different colors. If the pressure is continuously applied for a period of 30 minutes, there will be a notification via the LED light to allow the user to change their sitting positions to reduce the likelihood of pressure ulcers.
      4
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    Modeling and simulation of wind power generation system using diode bridge rectification circuit for converter
    This paper presents the variable-speed permanent magnet synchronous generator wind power system using the diode bridge rectification circuit for the converter. The wind speed model which simulates the actual wind is investigated, and it is realized as the Simulink model. The parameters of the permanent magnet synchronous generator are measured and the generator torque characteristic using the obtained parameters is calculated. The wind turbine torque characteristic and the range of the wind speed in which the wind power system can operate is clarified by comparing with boost converter method and PWM converter method. The diode bridge rectification circuit system simplifies the maintenance and improves the reliability and reduces the cost in compare with boost converter method and PWM converter method.
      1
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    Application of Matrix Converter to Wind Power Generation System
    (2024-01-01)
    Juntham, C.
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    This paper presents the application of a threephase matrix converter for wind power generation based on a permanent magnet synchronous generator (PMSG). The topology applied in the research is the 3 × 3 - matrix topology consisting of nine bi-directional switches. This paper focuses on the simulation of the proposed system using the MATLAB/ Simulink program to design the control algorithm for the PMSG. The algorithm and switching strategies acquired from the simulation will then be implemented on the real system using FPGA as the processor.
      4
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    A novel resolver-to-DC converter based on OTA-based inverse-sine function circuit
    A new technique for realizing the resolver-to-DC converter using the OTA-based inverse-sine function circuit is presented. The proposed converter comprises the demodulator, absolute detector, minimum detector, ± unity-gain amplifier, controlled signal logic circuit, and OTA-based inverse-sine function circuit. The output voltage is linearly proportional to the resolver angle with maximum absolute error of about 0.195%, which is less than the error from the conventional resolver-to-DC converter based on the similar OTA-based inverse-sine function circuit. PSPICE simulation and experimental results verifying the performances of the proposed circuit are in close agreement with the expected values. © 2008 SICE.
      5
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    Applied to reuse steam condensate water in Medium petrochemical plant to boiler feed water
    (2022-01-01) ;
    Seekhieo, A.
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    In Thailand's petrochemical industrial estate which has a small or medium-size plant, boiler feed water is bought from the external boiler feed water provider to use in an incinerator to make steam for plant use, and the steam condensate water that comes after the incinerator process is sold back to the provider as well. The cost gap between bought water and sold water is considered a waste since the income gained from selling post-boiled water is less than expenses from bought water. In this paper, the research to improve the steam condensate water quality and reuse the water has been proposed. This application is to be considered to build the steam condensate treatment unit for treating water potential to reduce the overall operation cost (OPEX). The online analyzer is being used to control the chemical dosing package via a plant control system to check the quality of water and treat it in real-time so the water can be reused.
      3