Irreversibilities associated with a rotary regenerator and the efficiency of a steam power plant |
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| Institution: | 1. Paleontološki inštitut Ivana Rakovca ZRC SAZU, Novi trg 2, 1000 Ljubljana, Slovenia;2. Departamento de Ciencias de la Tierra, Universidad de Cádiz, CASEM, 11510 Puerto Real, Spain;3. Institut des sciences de la Terre, Université de Lausanne, Géopolis, 1015 Lausanne, Switzerland;4. Department of Geology, Portland State University, 97207-0751 Portland, OR, USA;5. Department of Geology, Faculty of Science, Niigata University, 950-2181 Niigata, Japan;1. Department of Physiology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, The Netherlands;2. Department of Cardiology, Rouen Hospital, Rouen, France;3. MicroPort CRM, Clamart, France;4. Heraeus, Hanau, Germany;5. Department of Cardiology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University Medical Centre+ (MUMC+), Maastricht, The Netherlands;6. Department of Cardiology, Radboud University Medical Centre (Radboudumc), Nijmegen, The Netherlands;1. Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai Institute of Applied Mathematics and Mechanics, School of Mechanics and Engineering Science, Shanghai University, Shanghai 200072, PR China;2. School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, PR China;3. Shanghai Shangdian Power Equipment Co., Ltd., Fengxian District, Shanghai 210499, PR China |
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| Abstract: | In the present study a number of expressions determining the irreversible entropy generation in a rotary regenerator are presented. Adding to them formulae: (i) concerning the efficiency of a steam power plant, (ii) describing heat transfer and the pressure losses in a rotary heat exchanger, a computational model has been obtained in order to show how these irreversibilities and the efficiency of a steam power plant depend on the design parameters of a rotary regenerator. Here it was useful to assume an air cycle i-s for flue gas in a steam boiler. The numerical results are presented mainly in graph form making it possible to show the results obtained clearly and to easily draw some conclusions. By first, varying the values of the rotary regenerator matrix height, distribution factor of regenerator flow area on the hot and cold sides, total leakage factor, distribution factor of total leakage on the hot and cold ends and density of gas mass rates flowing through each side of the regenerator, the dependence of the entropy generation rates on the above parameter values is demonstrated. The direct effects of changes in values of the above parameters on a normalized energy measure or irreversibilities and the efficiency of a steam power plant are then evaluated. Having these results presented in juxtaposition, some general and practical conclusions are formulated. |
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