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Showing 1 to 20 of 25 for “"Flownex"”.
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Boiler system modelling using Flownex®
… boiler modelling methodology, specifically using Flownex, which is capable of running transient simulations for a large variety of coal-fired boiler designs typically used in Eskom. Flownex has been identified as the key software to accomplish the global objective of the Centre for Energy …
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Modelling of the deaerator system in Flownex
… plant. The software identified for this task is Flownex SE. Flownex is a one-dimensional thermal-hydraulic solver that solves user defined networks by obtaining a numerical solution of the governing equations of fluid dynamics and heat transfer. The software contains a vast library of low level …
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Development of appropriate steam turbine models in Flownex
… one-dimensional thermo-hydraulic network solver, Flownex, is the software envisaged to accomplish this goal. The development of appropriate steam turbine models in Flownex supports fulfilment of this goal. Steam turbines of fossil and nuclear power plants make up most of the generating capacity …
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Development of a dynamic modelling of biomass boilers using flownex
… The numerical model has been developed using Flownex, a one-dimensional thermohydraulic simulation software with the aim of presenting credible insights into transient performance and controllability of the boiler of interest. This study develops stand-alone numerical models of the economiser, …
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Development of a performance-based high pressure feed water heater model for Flownex SE
Feed-water heaters (FWHs) are an integral part of the power plant with respect to the overall heat recovery, and thus its efficiency. While the main purpose of the FWHs is to heat up the feed-water before being sent to the boiler, there are more added advantages owing to the installation of this …
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Component development for a high fidelity transient simulation of a coal-fired power plant using Flownex SE
… a high-fidelity transient system model using the Flownex Simulation Environment, a onedimensional thermohydraulic network solver. The components have been modelled all with the aim of using minimal design input data. The feedwater heater component model includes transient effects and thermodynamic …
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The Off-Design Modelling of a Combined-Cycle Power Plant
… a model of a combined-cycle power plant in Flownex which can be solved in off-design conditions in order to compare it to plant data. The verification of this model will show that Flownex can be used to effectively and efficiently model a combined-cycle power plant. The process of …
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Transient boiler heat exchanger thermal behaviour analysis
… method. Finishing off with the use of the Flownex software. The exact analytical solutions are used to characterise the transient temperature distribution in solid materials with simplified heat transfer, highlighting the dependence of the solutions on the Fourier number and Biot number. …
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Advanced analytics for process analysis of turbine plant and components
… The thermofluid engineering model was built on FLOWNEX® SE using existing custom components for the various heat exchangers. The model was then tuned to current plant conditions by catering for plant degradation and maintenance effects. The artificial neural network was of a multi-layer …
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Low load operation of turbine-driven boiler feed pumps
… The BFPT system of this Unit was modelled in Flownex, a one-dimensional thermofluid process modelling package. The model included individual pump stages, steam admission valves and a stage-by-stage turbine model utilising custom stage components. These turbine stage components represent each …
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The effect of steam generator tube plugging on its overall thermal performance - A Systems CFD-Based Study
… computational fluid dynamics (CFD) software Flownex® was used. First, a Flownex® model of the steam generator was developed and validated via comparison of the results to a validated model from the literature. Following this, a hydro-thermal analysis was performed to determine the effect of …
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Kalman Filtering and its Application to On-Line State Estimation of a Once-Through Boiler
… of the boiler are developed, a MATLAB® and a Flownex® model, comprising the economiser, evaporators, reheaters, superheaters and furnace. The mathematical MATLAB® model is better suited to real-time execution and is used in the filter. The more sophisticated model is based on a commercial …
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The Integration of a Mixed-Flow Impeller with a Crossover Diffuser into the CAT250TJ Engine
… (CFD) in Ansys® Fluent® and cycle modeling in Flownex® - were performed, followed by successful experimental testing of the upgraded compressor stage within the CAT250TJ engine. At the design point, CFD simulations demonstrated a 14.10% improvement in total-to-total pressure ratio and a 12.17% …
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Thermofluid design and performance analysis of an air-cooled heat rejection system for a 50 MWe sCO2 concentrated solar power plant
… The PC and IC designs were then modelled in the Flownex ® SE software to perform quasi-steady state studies, and to assist with the development of complete dynamic plant models by others. The Python and Flownex models agree well, with the heat rejection rates within 3%. The Flownex ® SE model …
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Developing a minimal-input one-dimensional methodology for modelling axial compressors using a diffuser analogy
… used as inputs for an off-design model built in Flownex SE. Using correlations of total pressure loss from the open literature, the Flownex model is then able to predict the stage's performance over a range of off-design operating conditions. The model was validated against a well-documented …
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Multiple-Input Single-Output system identification techniques using the pebble bed modular reactor data
… techniques on data obtained from the Flownex simulation package. These techniques are used to obtain a (MISO) mathematical model for the Pebble Bed Modular Reactor (PBMR). MISO system identification techniques are used in this project to study the effect that the inputs have on each …
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Determining appropriate loss coefficients for use in the nozzle-model of a stage-by-stage turbine model
… to accurately model a turbine stage. Utilizing Flownex, a thermohydraulic network solver, the turbine stage component can be expanded to accurately model any arrangement and category of turbine. This project focused on incorporating turbine blade passage geometrical information, as it relates to …
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First Order Assessment of Heat Transfer due to the Loss of Inventory in a Spent Fuel Pool
… as a first order approximation. Accordingly, the Flownex systems CFD code (version 8.6.1.2630) was used to simulate the thermal response of the uncovered SFAs in the SFP of a typical Pressurised Water Reactor (PWR) during a severe accident scenario. Two network models were developed. The first was …
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A thermofluid network-based methodology for integrated simulation of heat transfer and combustion in a pulverized coal-fired furnace
… co-simulation with a steam-side process model in Flownex® was successfully demonstrated for steady-state and dynamic simulations.
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Integrated process and control modelling of water recirculation in once-through boilers during low load and transient operation
… study transient events. The model developed in Flownex can simulate the complex thermo-fluid processes and associated controls of the feedwater start-up system. This includes the waterrecirculation loop, and allows for detailed transient analysis of the complete integrated system. The model was …
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