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The 3rd Conference on Thermal Power Plants (Gas, Combined Cycle, and Steam) starts on October 18, 2011 in Amirkabir University of Technology, Tehran, Iran. Energy crisis has brought a great deal of attention to electrical energy and the associated industries. The complexity of power generation made it more important as compared to other related industries. The 3rd conference on Thermal Power Plants...
In this study, a numerical simulation of evaporation in two phase flow of water has been performed considering energy and mass transfer during phase change based on the VOF (volume offluid) model in CFD software Fluent 6.3, with a UDF (user defined function) as an evaporation, and unsteady solution is considered in several times. The operating conditions are specified at high pressure (HP), 99.7 bar...
In this paper, effect of magnetic field on a bubble within two-phase bubbly flow studied by using a Level Set method. Two-phase flows under effect of external fields especially magnetic field have a wide range of medicine and engineering applications, such as magneto hydrodynamic problems (MHD), gas and oil facilities, fusion nuclear reactors, nuclear diagnose and medicine, MHD power plant, and etc...
Shahid Salimi steam power plant which located in proximity of Caspian Sea is one of the biggest power plants in Iran. Now, the desalination system of this power plant is ion exchange (IE) demineralization units. By considering this fact that there is waste heat in cooling seawater of the cycle condenser of this power plant, this study aimed to introduce proper desalination systems to use that mentioned...
PV system establishment needs full investment which must be economical versus network energy cost. This analysis is one of the most important parts of a solar system design. In Tehran the shape of the load curve of a commercial buildings and the form of the sun radiation curve are alike. By considering this coincidence there could be a way to use solar power to supply a part of the demand. According...
In this study the effect of earth reflective coefficient on the maximum solar radiation reached to a solar collector surface was investigated by the mathematical KT and Hay models. The results showed that the maximum total radiation on the collector inclined at optimum angles increases due to increasing the earth reflective coefficient. The results also showed that neglecting the earth reflection...
Fault detection is one of the most important and challenging issues in engineering application. In this article fault detection of Gilan combined cycle power plant is investigated. To do so two neural network structures are applied. The first neural network which is trained by Kalman Filter. The second structure is NARX network which is trained by levenberg-marquardt method. The results obtained show...
Controllers which are designed through traditional methods do not have proper performance due to parameters alternation, un-modeled dynamics, modeling error, unknown process and non-linearity of the process which is approximated linear and in some cases result in instability of the system. Hence in most modern controllers, robustness is major design feature. In this article a LQG controller for the...
The first step in designing the cooling system of a turbo generator is the ventilation system analysis. The present paper deals with a comprehensive investigation of flow parameters of a high power turbo generator. By employing the lumped-parameter model in the closed circuit of the flow network, the cooling medium flowrate and pressure drop in each element is calculated. In addition, considering...
In this article, helically serrated finned tubes, which are generally used in heat recovery steam generator (HRSG) boilers in combined cycle power plants, are experimentally studied, in order to find their thermal contact resistance (TCR) values in different conditions. Temperature, air velocity and fin-to-tube bonding extent were the variables and a precise methodology was performed to extract the...
So far, several combined cycles have been proposed with MHD generator as a topping cycle and gas turbine or steam turbine as bottoming cycles. Triple cycle which is examined in this study is a modification of all dual cycles has been proposed in different papers. Most of available cycles are dual. High temperature of hot gases exhausted from the MHD generator, was the motivation to consider the performance...
Retaining ring in rotating machineries such as turbo-generators is to resist centrifugal forces of the field end winding of rotors. Retaining ring is one of the high stressed parts of a turbo-generator and its failure may cause catastrophe. Inducing compressive residual stresses into retaining ring can raise resistance to stress cracking and also decrease the effect of high inner pressure imposed...
Stators of large turbo-generators experience a number of electromagnetic forces which may lead to not only violent vibration causing damage within stator windings but also noise emission. Therefore, an accurate computation of the resonant frequencies of stators seems to be very essential. The Ritz method is employed in the present analysis to drive the governing equation of the stator. Stator is modelled...
In this paper, novel methods for designing and implementing analogue and digital hardware and software for detecting hydrogen concentration are presented. In the proposed software, by using the benefits of MEMS thermal conductivity sensors, we could calculate hydrogen — air mixture conductivity and consequently measure concentration with using relations between heating power loss and temperature difference...
Compensation technique using series capacitor is very cost-effective way to increase power transfer capability. But use of the series capacitors may cause Oscillations Subsynchronous Resonance (SSR). In this paper Subsynchronous Resonance phenomenon investigated in compensation networks with series capacitor. And shown that unlike a fixed series compensation effect in creating the SSR phenomenon,...
This paper provides an idea for the presentation of virtual power plant(VPP) as a main sector of power system networks in energy market. This idea, in the decentralized power systems, consisting of thousands of distributed generation resources, optimizes the operation and presentation of an efficient DG group in energy market. In this study, the presentation of the virtual power plant in the energy...
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