This paper deals with the study of seismic analysis of hyperbolic cooling towers. Here we discusses hyperbolic stack natural draft cooling towers. The objective function is set to be the minimum weight of the tower. Structural analysis and design software for power plants. Eigen buckling analysis is carried out for three cooling towers using fea based ansys software. Solving applied problems involving hyperbolas college algebra. Cooling towers are designed and manufactured in several types, with numerous sizes available. How to model a hyperbolic cooling tower on sap2000 youtube.
The cooling towers make the control of the cooling process by controlled. Static and dynamic analysis of hyperbolic cooling tower. Bellary thermal power station is a power generating unit near kudatini village in bellary. How to model a hyperbolic cooling tower on sap2000. In consideration of the uncertain factors, a hyperbolic cooling tower with initial geometrical imperfections is studied by the pds module in ansys. We developed our first duplicate finder doublet scan in 1996, on classic mac os. With respect to the steel quantity and peak displacement index, the seven systems were analyzed and compared. Effect of buckling on analysis of hyperbolic cooling towers.
How does the shape of a hyperbolic cooling tower like. Natural draught hyperbolic cooling towers are the characterizing land marks. The study includes the comparison between two existing cooling towers of different element types and varying mesh ratio is adopted and also. Each cooling tower is 500 feet tall and approximately 370 feet wide at the bottom. Study the effect of wind load and dead load on rc hyperbolic. The analysis of thin shells of revolution in general has always occupied an important place in the theory of structures, and recently the problem of hyperbolic cooling towers has attracted many investigators due to the wide use of such shells in industry. Fluidika techlabs cooling tower performance evaluation software.
The project deals with the performance study and analysis of induced draft cooling tower, which is one of the deciding factors used for increasing the power plant efficiency also modelling and analysis of flow using software. How does the shape of a hyperbolic cooling tower like those. Data from fe analysis three different hyperbolic cooling tower shells are analyzed using different fe mesh sizes. Air flows in to the tower through openings in the bottom, and cools the entering hot water. You can analyse these structures in any finite element analysis software, i have seen designs done in staad pro using plate elements.
Stability analysis and performance comparison of large. Air flows in to the tower through openings in the bottom, and cools the. Dec 15, 2015 the top of cooling towers widens because this is the point where hot air from inside the tower diffuses and mixes with the atmospheric air. Keywords cooling tower, wind load analysis for cooling tower i. Analysis and design of strengthened hyperbolic cooling tower. Abstractthis paper deals with the study of hyperbolic cooling tower of 175m high above ground level. Bacs product selection software contains performance and technical data for all of bacs evaporative cooling products. Under the working condition of gravity and wind load, to contrast the two models of the presence or absence of abdominal rod displacement, stress and unit axial force, and check the stability of compressive bar, and structural. The main interest is to demonstrate that the column supports to the tower could be replaced by equivalent shell elements so that the software developed could easily be utilized. Static and model analysis will perform by using ansys 16. The top of cooling towers widens because this is the point where hot air from inside the tower diffuses and mixes with the atmospheric air. Natural draught cooling towers are very common in modern days thermal and nuclear power stations.
Stability analysis and performance comparison of largescale. Seismic analysis and design of a hyperbolic cooling tower ijsetr. All the fe models used to analyze the hyperbolic cooling tower. The hyperbolic cooling tower in hamburg, germany, is made up of a regular dodecagonal space trusses without internal bracing. The hyperbolic cooling tower is modeled by sketching the curved portion by arc command in a given height and. Because of circular symmetry, its just the equation of a section through the vertical axis of symmetry. May 28, 2019 what is the equation that determines the hyperbolic shape of a cooling tower. The software, which was accepted very well by a population of 90 students, was evaluated. The static and dynamic analysis of hyperbolic cooling tower. These con crete structures have the same height ft. Hyperboloid structure hyperbolic structures have a negative gaussian. This paper leads to software package utilized towards a practical application by considering problem of natural draught hyperbolic cooling towers. The cooling towers varying shape required flexible formwork for the changing diameters of the tower.
This cooling tower has been analyzed for wind load using ansys software by assuming fixity at the shell base. Model a hyperbolic cooling tower on sap2000 video tutorial download. In the power generation industry, a wellmaintained. In this study, shell portion of the cooling towers has been modeled and assuming bottom end is fixed condition. Two cooling towers with different heights are analyzed.
The wetcooling software was developed with design verification in mind, not to. Significance of meshfineness in accuracy of finite. The following sections each deal with a particular stage of analysis and define the pertinent methods that were used at that stage. Study on buckling behaviour of hyperbolic cooling towers. The linear static analysis is carried out using fea based ansys software. Slunecna rozhledna, sunny lookout tower is a simpler hyperboloid structure, velke pavlovice, czech republic, 2009. A hyperboloid of one sheet is a doubly ruled surface, and it may be generated by either of two families of straight lines. Mar 01, 20 here we discusses hyperbolic stack natural draft cooling towers.
What is the equation that determines the hyperbolic shape. Nonlinear buckling analysis of hyperbolic cooling tower. The mae west sculpture is a doubly ruled surface hyperboloid structure, munich, germany, 2011. Static and dynamic analysis of hyperbolic cooling tower 43 description of the geometry of the towers. Pdf analysis studying for improving cooling tower researchgate. Experimental studies on cooling tower the hyperbolic cooling towers are subjected to static and dynamic loads. Earthquake analysis of hyperbolic cooling towers pamukkale. The chilled water system analysis tool cwsat software is developed as a. Hyperbolic cooling tower repair preventative maintenance is essential in protecting critical infrastructure and keeping facilities operational.
Extent of cooling tower selection software parameter variation. The hyperbolic shape itself does not help the cooling of a power plant. A selection of finite shell element convergence study of finite shell elements available in ansys software is carried out, in order to validate the proper shell element. Kulkarni 3, software package utilized towards a practical application by considering the problem of natural draught hyperbolic cooling towers. Introduction a cooling tower is an enclosed device, designed for the evaporative cooling of water where hot water.
Analysis and design of strengthened hyperbolic cooling. A natural draft tower also known as hyperbolic cooling tower is similar to an. Numerical analysis are performed using a software coded in matlab programming language which makes possible to use matlab and sap2000 structural analysis software package simultaneously. Dynamic analysis of hyperbolic cooling tower, journal of civil engineering technology and research, civil, international journal of engineering trends and applications ijeta volume 3 issue 5, sep. Abstract hyperbolic cooling towers are large, thin shell reinforced concrete. Nonlinear buckling analysis of hyperbolic cooling tower shell. Effect of wind loading on analysis of natural draught hyperbolic cooling tower. The linear static analysis of hyperbolic cooling tower is carried out using different shell elements. Contrastive analysis is made on stress, internal force. Three different cooling towers will modeled by using solidworks 2016 software i.
International journal of civil engineering nd and technology. A selection of finite shell element convergence study of finite shell elements available in ansys software is carried out, in order to. The software program can be used for the analysis of existing towers or for the preparation of specifications for new towers. Hyperbolic cooling tower repair structural technologies. What is the equation that determines the hyperbolic shape of a cooling tower. Effect of wind loading on analysis of natural draught. Computational software to analyze and determine cooling performance curves and thermophysical operational variables in natural draft counterflow wet cooling. According to the parametric analysis scheme, considering all the combinations of each parameter, the seven types of hyperbolic steel cooling tower systems were studied systematically. Analysis of natural draught hyperbolic cooling tower by finite element method using equivalent plate method.
The first hyperbolic towers were designed in 1914 and were 35 meters high. Two existing cooling towers are chosen from bellary thermal power station btps as case study. Citeseerx document details isaac councill, lee giles, pradeep teregowda. If you read this book carefully, you can make any cooling tower design programs by yourself. A matlabbased program for the design and simulation of. Cooling towers hyperbolic stack natural draft cooling. Today, the tallest cooling towers are in france, standing a remarkable 170 meters tall. Both the towers have varying thickness throughout the height. Case study of seismic effect on hyperbolic cooling towers issuu.
In the power generation industry, a wellmaintained cooling tower enables the entire cooling system to perform at optimum efficiency. They are an imposing characteristic and integral part of thermal power plants all. The major concern during i study the cooling tower theory was how to computerize the cooling tower theory from the calculation of ntu to the cooling tower performance analysis. Finite element analysis of hyperbolic cooling towers. Significance of meshfineness in accuracy of finite element. For this analysis a single case of the tower with alternative i and v supports is taken up. Because of circular symmetry, its just the equation of a section through the vertical axis of symmetry math\fracz2a2\fracr2b21math where mathzmat. Abaqus, shell, hyperbolic cooling tower, static, buckling i.
How to design a natural draft cooling tower hyperbolic. Again, this will be a first issue releasing the actual engineering approach. This cooling tower has been analyzed for wind load using ansys software by assuming fixity at the. Analysis of natural draught hyperbolic cooling towers by. The boundary conditions considered are top end free and bottom end fixed. Feb 05, 2015 2 n prabhakar technical manager, bombay structural aspects of hyperbolic cooling tower, national seminar on cooling tower, jan1990, technical session iv, paper no 9 3 prashanth n, sayeed. This paper leads to software package utilized towards a practical application by considering problem of natural draught. Proceedings of the 2 nd international conference on current trends in engineering and management icctem 2014 17 19, july 2014, mysore, karnataka, india 9 static and dynamic analysis of. Case study of seismic effect on hyperbolic cooling towers. A cooling tower is an enclosed device, designed for the. Each cooling tower is 500 feet tall and approximately 370 feet wide at the bottom with concrete walls 20 inches thick. Case study on effect of static and dynamic loads on.
The material properties of the cooling tower are youngs modulus 31gpa, poissons ratio 0. In this study analysis and modelling were done using software. Data analysis was initiated for a sample of 45 data per group and. Hyperbolic software competence at your service tidy up 5 a new generation of our duplicate finder. In example 6 we will use the design layout of a cooling tower to find a hyperbolic equation that models its sides. Contrastive analysis is made on stress, internal force, displacement and failure probability of cooling tower shell. Effect of wind loading on analysis of natural draught hyperbolic. Hyperbolic cooling tower, dynamic analysis, earthquake. What makes the cooling successful is the height of the tower. It is the most commonly used shape among natural draught cooling towers. Manufacturors and users of cooling towers have very diverse requirements. Finite element analysis of hyperbolic cooling tower by the. It works on the principle of temperature difference between the air inside the tower and outside the tower.
Jul 05, 2014 model a hyperbolic cooling tower on sap2000 video tutorial download. Cooling towers, closed circuit cooling towers, and evaporative condensers. According to the parametric analysis scheme, considering all the combinations of each parameter, the seven types of hyperbolic steel coolingtower systems were studied systematically. This paper is concerned with a numerical solution of hyperbolic cooling tower shell, a class of full nonlinear problems in solid mechanics of considerable interest in engineering applications. The hyperbolic shape is just to have a stronger structure to deal with the high winds you get by increasing altitude. Apr 23, 2014 you can analyse these structures in any finite element analysis software, i have seen designs done in staad pro using plate elements. Creating a new model to predict cooling tower performance and.
Parametric analysis of hyperbolic cooling tower under. Dynamic loads are dominant loads among all other loads. Introduction hyperbolic cooling towers are large, thin shell reinforced concrete structures which contribute to environmental protection and to power generation efficiency and reliability. Cooling tower calculations software program is a powerful, user friendly, software program for the analysis of induced, mechanicaldraft, counterflow cooling towers. In this analysis, the postbuckling analysis of cooling tower shell with discrete fixed support and under the action of wind loads and dead load is studied. The cooling tower construction contains over 3,900 cubic yards of concrete and 488,000 pounds of reinforcing steel. Hyperbolic cooling towers are an essential part of thermal power plants. Thes e towers with very small shell thickness are exceptional stru ct res by their sheer size and sensitivity to horizontal loads.
Therefore, we want to maximize the area through which this diffusion takes place, so that more hot vapor is quickly mixed and the entire process of cooling is done more efficiently. Solving applied problems involving hyperbolas college. What is the equation that determines the hyperbolic shape of. Discretization errors in finite element models of hyperbolic. Two analysis methods done and compared were time history and response spectrum. This is not to say that the software cant be used for the design of cooling towers. Structure a is a typical hyperbolic cooling tower shell. Natural draft cooling tower performance evaluation software. We use german finite element software sofistik, where shell elements can be used. The finite element analysis of hyperbolic cooling tower under quasistatic wind load 1, using a constant meridional curvature element and semiloof shell elements. Optimality study in linear static analysis of hyperbolic. Numerical simulation of heat transfer process in solar enhanced natural draft dry. Home software training model a hyperbolic cooling tower on sap2000.
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