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Supply chain management efficiency for the Andrographis paniculata (Burm. f.) Wall. ex Nees of the Bandongbang community enterprise in Prachinburi province, Thailand
(2024-07-01)
Lertpairat, S.
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Suwanmaneepong, S.
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Llones, C.
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Mankeb, P.
The results showed that primary producers in the upstream supply chain, farmers engaged in systematic cultivation and collaborative planning with the Chaopraya Abhayabhubesorn Hospital Foundation. A two-year Memorandum of Understanding (MOU) instils farmers’ confidence in Andrographis paniculata cultivation. Supply chain operations reference (SCOR) based on practices that exhibited a moderate level of implementation, reflecting a balanced approach. In the midstream supply chain, effective planning aligns production capacity with customer demand, ensuring the availability of quality inputs at fair prices. The midstream supply chain excels in product collection, on-time delivery, and structural damage control protocols. The Chaopraya Abhayabhubesorn Hospital Foundation played a crucial role in the downstream supply chain. Their strategy balanced production resources to effectively meet market demand. MOUs with various members, stringent quality checks, and defined return protocols to ensure product quality. In conclusion, the study found effective supply chain practices. It underscored the importance of stakeholder collaboration in optimizing A. paniculata production and distribution. Relevant government agency support for SCOR-based supply chain management practices could help to enhance the overall sustainability and efficiency of A. paniculata among community enterprises.
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Production efficiency and the role of collective actions among irrigated rice farms in Northern Thailand.
(2022-01-01)
Llones, Christopher Almoroto
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Mankeb, Panya
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Wongtragoon, Unggoon
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Suwanmaneepong, Suneeporn
The idea of shared irrigation management is expected to result in a better production outcome for farmers. However, there is little evidence of whether collective action participation leads to a higher level of production efficiency. Using cross-sectional survey data from irrigated rice farms in Northern Thailand, we found that a higher level of production efficiency is associated with higher participation in collective action. At the same time, engagement in collaborative works such as irrigation maintenance, group meetings, conflict resolution, and policy adherence has a marginal effect on farmers’ efficiency. Our findings suggest that complementing existing efforts in addressing irrigation issues with efforts to mobilize collective actions among farmers leads to an improved on-farm outcome.
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Application of a small transformer for designing current detection and overcurrent protection circuit for laboratory tables
(2022-01-01)
Arunrungrusmi, Somchai
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Phanphech, Parinda
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Mungkung, Narong
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Tanitteerapan, Tanes
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Poonthong, Wittawat
The purpose of this research is to study, design and build over current protection circuits for low voltage AC supply for electrical and electronic circuit experiments in laboratories to prevent damage to circuits and equipment. The use of transformers as current detectors in this research focuses on 3 issues: 1. Circuit design and testing 2. Determination of voltage drop and power loss at current sensing transformer 3. Finding the efficiency of the designed circuit. This test will be performed 5 times to ensure the accuracy of the designed circuit. The research results showed that the designed circuit can cut the circuit efficiently and with precision, the designed circuit has an error of not more than 1%, can cut off the circuit when an over current occurs and prevent short-circuit and reduce the rate of damage of the device
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The effects of operating conditions and the biomass component on combustion efficiency and emission performance of a swirling fluidized-bed combustor fired using
(2021-01-01)
Udomsup, Janya
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Choomjaihan, Prasan
This work presents a study for biomass possible to bring renewable energy in a swirling fluidized bed combustor (SFBC). The main objective of this experimental work was to study the biomass component and excess air of biomass. Palmyra palm shell, Leucaena (lam.), and water hyacinth are using as fuel in the tests. Quartz sand of 600-850 µm and static bed height of 20 cm was used as inert bed material. For all of the tests, the feed rate was fixed as 45 kg h<sup>-1</sup> for variable excess air (of 40%, 60% and 80%). As the experimental results, the temperature profiles in SFBC were obviously seen deviate when tests with higher excess air. In the test run, the highest cellulose (palmyra palm shell) for 80% excess air had CO and NO emissions were found in quite stable level (less than 250 and 300 ppm, respectively). The combustion efficiency more than 99% could be achieved in this work.
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Optimization Based Dynamics Setpoint Control to Improve Cycle Power Efficiency of The Lm6000pf+ Aero Gas Turbine
(2021-01-01)
Kongratana, Viriya
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Tawangkan, Wissanudech
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Wongvanich, Napasool
The efficiency of the Aero Gas Turbine in a combine cycle power plant (CCPP) is maximum under the conditions that the combustion chamber temperature is highest, the compressor is working at full capacity and all bleed valves are closed. The Inlet Air Heating System is therefore used to improve the efficiency of the machines in low power generation conditions. To ensure stability in response to air temperature and machine capacity changes, this work thus proposes an optimization-based automation system designed to stabilize the CCPP. Results show that under changing conditions, the overall efficiency of the air compressors in low load conditions increases by 3%, shortening the system start time of 15 minutes and improving the efficiency of the combined cycle power plant by an average of 100 BTU / kw.hr. The average fuel cost is reduced by approximately 600,000 baht per month.
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Analysis of electric current by using MySQL database on web server for machine performance evaluation: A case study of air conditioning system
(2020-10-13)
Sriratana, Witsarut
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Khagwian, Vittaya
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Satthamsakul, Sutham
This study developed a performance analyzing system for industrial machines by using an air conditioning system as a case study. Electricity consumption of the air conditioner compressor operating normally under controlled temperature in the room was gathered by applying the principle of quantitative data collection. Work efficiency of the system was analyzed by using the big data pattern. Due to sufficient information, it can further contribute to the application of AI (Artificial Intelligence) in analysis of the failures or causes of machine malfunctions. Data collecting system in this study was designed to analyze electric current and various parameters including power voltage, temperature and humidity, real power and power factor in order to recheck as well as increase the reliability of the system. All collected data were stored in the MySQL database on a web server and managed by phpMyAdmin that could allow users to access the information chronologically on daily, monthly, or yearly basis via a computer screen. The test results showed that the designed system was accurate with a small variation about 0.07 A or 1.78% compared to the standard digital ammeter. For power voltage, an average difference compared to the standard digital voltmeter was approximately 0.4 V or about 0.17%.
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Effects of inner angle of bowl, flow rate and speed on the efficiency of glycerol separation from the raw biodiesel using cylindrical bowl centrifuge
(2017-01-01)
Chungcharoen, Thatchapol
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Netjaibun, Kanokphan
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Pratabkong, Thaweesak
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Suwannasam, Puttapong
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Limmun, Warunee
The centrifugal technique has been widely used for separation of fluids with moderately high viscosities because it provides an efficient separation in short residence times. In this work, the cylindrical bowl centrifuge was selected for separation of raw biodiesel and glycerol. In addition, the inner angle of bowl, flow rate and speed were investigated on their effects on the efficiency of separation. The experimental results showed that the inner angle of bowl and the flow rate affected the efficiency of separation significantly. The increase of inner angle of bowl (from 90 to 135 degree) and flow rate (from 50 to 200 ml/min) provided the increase of separation efficiency. In term of speed, the efficiency of separation was increased when increasing the speed from 1,800 rpm to 2,100 rpm. On the other hand, the efficiency of separation was decreased when increasing the speed from 2,100 rpm to 2,400 rpm. The efficiency of cylindrical bowl centrifuge was in the ranges of 29.17-39.83%, 52.83-61.83% and 84.6-91.4% for bowl inner angles of 90, 120 and 135 degree, respectively. The bowl inner angles of 135 degree, flow rate of 200 ml/min and speed of 2,100 rpm were appropriate conditions for glycerol separation from the raw biodiesel using cylindrical bowl centrifuge.
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Comparison on performance between synchronous single-ended primary-inductor converter (SEPIC) and synchronous ZETA converter
(2014-10-15)
Woranetsuttikul, Kaweepoj
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Pinsuntia, Kittapas
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Jumpasri, Nattawat
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Nilsakorn, Taywin
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Khan-Ngern, Werachet
This paper presents the performance comparison of synchronous single-ended primary-inductor converter (SEPIC) and synchronous ZETA focusing on the converter efficiency and the output waveform quality. The conventional SEPIC and ZETA converters operated in Buck and Boost modes were modified to the synchronous SEPIC and synchronous ZETA converters to improve the converter efficiency. The operating conditions were setup where the duty cycle was operated from 0.3 to 0.7 for covering buck-boost modes at the continuous current mode. Two switching frequencies at 20 kHz and 40 kHz were operated to compare the effect of switching loss and conduction loss where the efficiency was concerned. Finally, the converter efficiency and the ripple factor of the output voltage were concluded.
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Analysis on savings and credit cooperatives efficiency in Thailand: A data envelopment analysis (DEA) approach
(2014-01-01)
Asawaruangpipop, Poramate
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Suwunnamek, Opal
The microfinance institutions in Thailand were considered to be significant as the alternative financing source such as Savings and Credit Cooperatives (SCCs). While these institutions have been intensified in term of cooperative quantity and impact on entire economy, many SCCs' operations have still now been suffered from losses with negative returns and liquidity problems. This research therefore aims to investigate the efficiency of 732 SCCs in Thailand by using the databases of Cooperative Auditing Department, Ministry of Agriculture and Cooperatives of Thailand and evaluate SCCs' technical efficiencies on production and intermediation model by Data Envelopment Analysis (DEA) method. The efficiency evaluation results classified according to the types of cooperatives indicated that state enterprise cooperative had maximum quantity of efficient cooperatives and average efficiency score. When conducting the co-analysis on efficient cooperatives or best practiced cooperatives of each type of cooperative, it was found that private cooperatives had maximum efficiency in term of cooperative quantity and efficiency score. © 2014 Academic Journals Inc.
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Air-gap power and rotor loss estimation for induction motor efficiency monitoring based on Kalman filtering
(2013-01-01)
Jirasuwankul, N.
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Manop, C.
This paper presents a technique of induction motor's efficiency monitoring based on air-gap power and rotor loss estimation by Kalman filtering. A simplified model of three phase induction motor, with equivalent circuit of five elements, has been tested by the proposed technique with varying load torque and power to represent practical operations. Good agreement between the simulation and experimental results are found in a normal operating range of load torque and power. © 2013 IEEE.

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