The Electricity Generating Authority of Thailand , Thai: การไฟฟ้าฝ่ายผลิตแห่งประเทศไทย, is a state enterprise that owns and manages the majority of Thailand's electricity generation capacity, as well as the nation's transmission network.EGAT is managed by the Ministry of Energy.Most of EGAT's electricity is sold to the Metropolitan Electricity Authority and the Provincial Electricity Authority . Wikipedia.
Ngarmukos C.,Ramathibodi Hospital |
Chailurkit L.-O.,Ramathibodi Hospital |
Chanprasertyothin S.,Mahidol University |
Hengprasith B.,Electricity Generating Authority of Thailand |
And 2 more authors.
Clinical Endocrinology | Year: 2012
Background: Osteocalcin (OC), an osteoblast-specific protein, has been demonstrated to affect glucose metabolism in both animals and humans. Studies in animals have shown an effect of undercarboxylated OC (ucOC) on beta-cell proliferation and insulin resistance. It remains unclear whether OC is associated with the future development of diabetes in humans, as well as the relative importance of ucOC vs OC. Objective: The aim of this study was to examine serum OC and its post-translational forms as potential biomarkers for future the development of type 2 diabetes. Methods: This was a nested case-control study using data from the Electricity Generating Authority of Thailand (EGAT). We identified 63 men without diabetes in the exploratory cohort at baseline who developed type 2 diabetes (DM) during the 10-year follow-up period from 1998-2008, and also 63 men age- and BMI-matched for a non-diabetes control group (non-DM). Serum N-mid OC and ucOC were measured in baseline blood samples. Logistic regression models were used to explore and identify baseline factors, including OC and ucOC, that predicted the subsequent development of diabetes. Results: The mean age and BMI were similar in both non-DM and DM groups (47.2 ± 0.5 vs 47.8 ± 0.8 years and 25.2 ± 0.5 vs 25.9 ± 0.5 kg/m 2, respectively). Only baseline mean serum N-mid OC (15.2 ± 0.5 vs 13.0 ± 0.5 μg/l, P < 0.05) and fasting plasma glucose (4.92 ± 0.04 vs 5.28 ± 0.07 mmol/l, P < 0.05) were significantly different between the two groups. Multiple logistic regression analysis showed that baseline serum N-mid OC and glucose, but not ucOC, were independent risk factors for the development of diabetes in this long-term study cohort. Conclusions: Circulating total OC is associated with incident diabetes in men. Further studies to evaluate the potential utility of OC as a biomarker to predict the development of type 2 diabetes are warranted. © 2012 Blackwell Publishing Ltd.
Vithayasrichareon P.,University of New South Wales |
MacGill I.F.,University of New South Wales |
Nakawiro T.,Electricity Generating Authority of Thailand
Renewable and Sustainable Energy Reviews | Year: 2012
Rapid social and economic progress in fast developing countries such that among the countries in the Association of Southeast Asian Nations (ASEAN) have driven substantial growth in electricity consumption in this region. Whilst this represents significant societal and economic development, it has potentially growing adverse environmental impacts. This raises a concern on sustainable development in the electricity sector in this region. This study evaluates key sustainability challenges in the electricity industries in the five largest energy consumers in ASEAN: Indonesia, Thailand, Malaysia, the Philippines and Vietnam. The 3A's energy sustainability objectives: Accessibility, Availability and Acceptability are used as the sustainability analytical framework. This study also draws together a set of associated indicators and criteria within the analytical framework to analyse the status of the electricity industries in these countries. The analysis shows that key sustainability challenges in the ASEAN-5 are attributable to satisfying rapid demand growth; enhancing security of electricity supply; and mitigating the increase in CO 2 emissions from electricity generation. Given the promising resource and technical potential in this region, renewable energy emerges as a favourable option to address these challenges; however, increasing the share of renewable energy in electricity generation requires considerable policy support. This study suggests that there is an opportunity for the ASEAN countries to strengthen regional collaborations through experience and resource sharing to enhance sustainability in the electricity industries. This study also highlights some of the key issues facing the electricity industry, and the need for new generation investment decision support tools which can address these issues. © 2012 Elsevier Ltd. All rights reserved.
Kongnam C.,Electricity Generating Authority of Thailand |
Nuchprayoon S.,Chiang Mai University
Renewable Energy | Year: 2010
The control problem of a wind turbine involves the determination of rotor speed and tip-speed ratio to maximize power and energy capture from the wind. The problem can be formulated as a nonlinear programming problem with the annual energy generation as the objective function. The wind speed distribution is modeled as the Weibull distribution. The Weibull shape and scale parameters are assigned to be stochastic in response to limited wind data and variability nature of the wind. It is proposed to apply particle swarm optimization to solve for optimum rotor speed under fixed-speed operation and optimum tip-speed ratio under variable-speed operation. The optimum rotor speed varies with the wind speed distribution, while the optimum tip-speed ratio does not depend on the wind speed distribution. It can be concluded from the simulation results that both the wind power and energy are more dependent of the Weibull scale parameter than the Weibull shape parameter. This implies that the wind power and energy are more dependent of the mean wind speed than the speed distribution. © 2010 Elsevier Ltd.
Nuntaphan A.,Electricity Generating Authority of Thailand |
Vithayasai S.,Chiang Mai University |
Vorayos N.,Chiang Mai University |
Kiatsiriroat T.,Chiang Mai University
International Communications in Heat and Mass Transfer | Year: 2010
This paper presents the performance of a wire-on-tube heat exchanger of which the wire is an oscillating heat pipe. The experiments for this heat exchanger were performed in a wind tunnel by exchanging heat between hot water flowing inside the heat exchanger tubes and air stream flowing across the external surface. R123, methanol and acetone were selected as working fluids of the oscillating heat pipe. The inlet water temperature was varied from 45 to 85 °C while the inlet air temperature was kept constant at 25 °C. The results show that the oscillating heat pipe technique for all working fluids could increase around 10% of the heat transfer rate obtained from that without the refrigerant flow in the capillary tube when the inlet water temperature is at 60 °C. Moreover, the heat transfer models for evaluating the heat exchanger effectiveness and the air-side heat transfer coefficient, are also developed in this work. These results of the models agreed very well with the experimental data. © 2009 Elsevier Ltd. All rights reserved.
Chotivisarut N.,Rajamangala University of Technology at Lanna |
Nuntaphan A.,Electricity Generating Authority of Thailand |
Kiatsiriroat T.,Chiang Mai University
Renewable Energy | Year: 2012
In this study, a concept of using thermosyphon heat pipe radiator to extract heat from water in a storage tank to generate cooling water during the nighttime was proposed. The cooling water could be used to serve the cooling load in a room during the daytime. A tested room with artificial load was constructed and a heat transfer model to calculate the water temperature during the nighttime and the room temperature during the daytime was developed. The simulated results agreed well with those of the experimental data. The model was used to find out the possibility of this concept for seasonal cooling load reduction of the similar building in the areas of different climates. The selected sites were Bangkok and Chiang Mai, Thailand and also Alice Springs, Australia where they are hot and humid, hot and semi-humid, and hot and semi-arid, respectively. Cooling water was produced during winter and used to serve cooling load in an air-conditioned building in summer. It found that, among three cities, Alice Spring showed a highest potential followed by Chiang Mai and Bangkok. The effect of controlled room temperature and UA of the room cooling coil on summer load fraction were shown. © 2011 Elsevier Ltd.
Sritara C.,Mahidol University |
Ongphiphadhanakul B.,Mahidol University |
Chailurkit L.,Mahidol University |
Yamwong S.,Mahidol University |
And 2 more authors.
Journal of Clinical Densitometry | Year: 2013
Serum uric acid levels have recently been found to be associated with bone mineral density (BMD) in elderly males. The purpose of the present study was to investigate the relationship between bone-related phenotypes and serum uric acid levels in young and middle-aged males and females. Subjects consisted of 1320 males and 485 females aged 25-54. yr. Bone densitometry and quantitative ultrasonometry (QUS) were performed on each subject. Serum uric acid and biochemical markers of bone turnover were measured in fasting serum samples. When adjusted for covariates including age, body weight, and serum creatinine in multiple linear regression models, it was found that there was a positive association between uric acid levels and BMD in males at the lumbar spine (p< 0.05). The association between uric acid levels and BMD was found in females after controlling for age, body weight, and serum creatinine at the femoral neck, but in the opposite direction (p< 0.05). Uric acid levels were related to the stiffness index (SI) as assessed by QUS in males, independent of age, body weight, and serum creatinine (p< 0.05). No association between uric acid and SI in females was found. The present study demonstrated a positive association in males between serum uric acid levels and BMD, and SI from QUS, suggesting a beneficial influence of uric acid on both the quantity and quality of bone in males. © 2013 The International Society for Clinical Densitometry.
Anantavanich K.,Electricity Generating Authority of Thailand |
Pietsch G.J.,RWTH Aachen
IEEE Transactions on Power Delivery | Year: 2016
A means to reduce thermal and pressure stress of electrical installations due to internal arcing is the application of arc energy absorbers. Most of them consist of layers of expanded metal with a complex fine structure. The direct consideration of such devices in advanced pressure calculation methods is hardly feasible due to the huge amount of necessary computing capacity. That is why it is reasonable to replace a direct consideration of such absorbers in the calculations by models, which describe in a simplified way the effects of absorbers. The main effects influencing pressure rise are heat absorption and flow resistance. In this contribution, several models describing these effects are presented and implemented in a pressure calculation method, which utilizes a computational fluid dynamics solver to obtain 3-D resolved pressure results. This new approach is applied to some applications and validated by comparing measurements with calculation results. © 2015 IEEE.
Chureesampant K.,Electricity Generating Authority of Thailand
35th Asian Conference on Remote Sensing 2014, ACRS 2014: Sensing for Reintegration of Societies | Year: 2014
This paper addresses the change detection capabilities of polarimetric synthetic aperture radar (SAR) for the L-band frequency in comparison with single- and dual-polarization and fully polarimetric SAR data. The combinations of polarized power data are combined co-polarized power (HH+VV) data, combined cross-polarized power (HV+VH) data, and total power (HH+HV+VH+VV) data. All polarization combinations are investigated quantitatively for unsupervised change detection under different topographic characteristics. In particular, highly urbanized area (Osaka), vegetated area (Chiba), and mixed topographic area (Kyoto) in Japan are examined. The unsupervised change detection method applied in this study is based on a closed-loop process. Firstly, adaptive iterative filtering is used to determine the optimal filter size such that the speckle noise is sufficiently reduced. Secondly, the log-ratio image is generated from filtered SAR images and is modeled according to a Gaussian distribution. Thirdly, the Kittler-Illingworth minimum error thresholding (KI) algorithm is applied under generalized Gaussian (GG) assumption to select the optimal double thresholding (T1, T2) that discriminates the positive changes with backscatter increase and negative changes with backscatter decrease from the unchanged areas. The double thresholding was obtained from the two lowest KI criterion function JGG(T1,T2) values, and this showed high potential for generating accurate change detection. From a comparison of the change detection performance for various topographic features, the combined cross-polarized power (HV+VH) data are preferable if fully polarimetric data are unavailable. The selection of filter size affects the change detection accuracy, and is dependent on the topographic characteristics.
Patchimpattapong A.,Electricity Generating Authority of Thailand
Proceedings of the International Conference on Energy and Sustainable Development: Issues and Strategies, ESD 2010 | Year: 2010
Strengthening energy security, mitigating global warming and being competitive in global markets are among reasons Thailand is developing nuclear power program. Based on the current Thailand Power Development Plan there will be 5 units of a 1,000 MWe nuclear power plant commercialized from 2020 to 2028. Nuclear power will contribute no greater than 10% of Thailand electricity generation. Currently, Electricity Generating Authority of Thailand (EGAT), government owned utility, is conducting nuclear power plant feasibility study. Major tasks include reactor technology and supplier selection, site survey and selection, and human resources development planning. Since this is Thailand's first nuclear power plant, infrastructure assessment and establishment planning, e.g. nuclear law and regulatory body, and public education and participation, are also crucial to the success of the program. All these will be in the readiness report to submit to the Thai Cabinet for approval next year. According to the Nuclear Power Infrastructure Establishment Plan, a roadmap for launching nuclear power program in Thailand, nuclear power project will be implemented during 2011-2013, construction will start in 2014, and Thailand's first nuclear power plant will be complete for commercial operation in 2020.
Sangpetch T.,Electricity Generating Authority of Thailand
2014 International Conference on Probabilistic Methods Applied to Power Systems, PMAPS 2014 - Conference Proceedings | Year: 2014
This paper presents a study of the dependable capacity of renewable generation, undertaken within System Planning Division, Electricity Generating Authority of Thailand (EGAT), in 2011. In the study, reliability evaluation methods are chosen for an assessment of dependable capacities associated with system reliability indices to determine specific information for the long-term planning purposes. A review of generation profiles of renewable power plants is undertaken with specific targets of six sources, i.e. solar, wind, biomass, biogas, municipal solid waste, and mini-hydro. Obtained data of generation profiles are used to develop the probabilistic criteria for generation adequacy assessment, representing the nonlinear relationship of conventional and renewable power plants as a function of availability for system capacity planning. Later, the paper offers a mathematical model for dependable capacity assessment. The Probability Density Function (PDF) is adopted for different reliability indices to evaluate the dependable capacity on the basis of probabilistic actual generation profiles from the obtained data of power plants. Reliability evaluation methods - chronological and probabilistic - are deployed throughout analytical process. Lastly, the paper provides results from the analyses of the country's survey data, along with a description of the dependable capacities onto six different renewable generating resources and variety of studied periods. © 2014 IEEE.