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Keywords: void fraction calculation, two-phase flow, identification and modelling of a mass transfer network.

Summary

The basis of the research is a 13 km long citywide steam network with pipe diameters between DN50 and DN450 [1]. In order to reduce the loss of energy the measurement of the losses and the determination of their spatial and temporal distribution is required, thus suggestions can be made for a more energy efficient operation of the network [2].

The identification measurements of the steam network indicated a two-phase flow (wet steam) under working conditions. Furthermore in a reduced operating mode of the steam network, the output of the power plant and the measured consumption of the consumers showed a large difference, which indicated the limitations of the current monitoring system, the lack of the measurements of the condensation and the inaccuracy of the measurements of the steam flow. These reasons justified the development of a new intelligent monitoring system with an expert system. The following tasks have been performed in the research:

the geometry, topology and the data corresponding to the junctions and branches of the network have been recorded, visualised and archived;
tracing and characterization of the two-phase flow and condensation;
determination of material properties (thickness of the film, thermal conductivity, heat transfer coefficient, shear stress etc.), properties of state of operation (velocity-distribution, vapor/liquid volume fraction, critical velocity of steam, etc.), state of flow (layered, annular, spray) [3,4];
development of evaluation methods for the signals of the special sensors (volume flow meter operating as a condensator, flow meter based on dynamic pressure measurement, mass flow meter based on an acoustic approach).

In the paper the calculation method and formulas developed for the characterisation of a two-phase stratified flow in the network instrumented with classical and special measurements sensors are presented. The construction and development of the above devices and methods have provided the strategic background for the establishment of an intelligent monitoring and expert system.

References

1: L. Szakonyi, "Identification and computer aided supervising system integration of a regional steam-water network", Acta Agraria Kaposváriensis, University of Kaposvár, Hungary, (in Hungarian) Vol. 10, No. 1, pp. 157-162, 2006.
2: L. Szakonyi, "Developing of an info-communication technology for regional energy-distribution", Symposium on Informatics in Higher Education, Debrecen, Hungary, (in Hungarian), pp. D4 (p.12), 24-25. Aug. 2005.
3: L. Szakonyi, I.A. Jancskar, Z. Sari, "Energetic model for an elementary unit of a steam network", Pollack Periodica, An International Journal for Engineering and Information Sciences. HU ISSN 1788. 1994. Akadémiai Kiadó, Budapest, Vol. 1, No. 3, pp. 91-102, 2006.
4: L. Szakonyi, "Energetic model of an elementary pipe-segment of a steam-water network", Pollack Periodica, An International Journal for Engineering and Information Sciences. HU ISSN 1788. 1994. Akadémiai Kiadó, Budapest, Vol. 2, No. 1. pp. 63-78, 2007.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 89 PROCEEDINGS OF THE SIXTH INTERNATIONAL CONFERENCE ON ENGINEERING COMPUTATIONAL TECHNOLOGY Edited by: M. Papadrakakis and B.H.V. Topping Paper 194 Measurement Based Flow Regime and Velocity Profile Calculation of a High Pressure Steam Network in a Saturated State L. Szakonyi, P. Ivanyi and Z. Sari Department of Information Technology, Pollack Mihály Faculty of Engineering, University of Pécs, Hungary doi:10.4203/ccp.89.194 purchase the full-text of this paper Full Bibliographic Reference for this paper L. Szakonyi, P. Ivanyi, Z. Sari, "Measurement Based Flow Regime and Velocity Profile Calculation of a High Pressure Steam Network in a Saturated State", in M. Papadrakakis, B.H.V. Topping, (Editors), "Proceedings of the Sixth International Conference on Engineering Computational Technology", Civil-Comp Press, Stirlingshire, UK, Paper 194, 2008. doi:10.4203/ccp.89.194 Keywords: void fraction calculation, two-phase flow, identification and modelling of a mass transfer network. Summary The basis of the research is a 13 km long citywide steam network with pipe diameters between DN50 and DN450 [1]. In order to reduce the loss of energy the measurement of the losses and the determination of their spatial and temporal distribution is required, thus suggestions can be made for a more energy efficient operation of the network [2]. The identification measurements of the steam network indicated a two-phase flow (wet steam) under working conditions. Furthermore in a reduced operating mode of the steam network, the output of the power plant and the measured consumption of the consumers showed a large difference, which indicated the limitations of the current monitoring system, the lack of the measurements of the condensation and the inaccuracy of the measurements of the steam flow. These reasons justified the development of a new intelligent monitoring system with an expert system. The following tasks have been performed in the research: the geometry, topology and the data corresponding to the junctions and branches of the network have been recorded, visualised and archived; tracing and characterization of the two-phase flow and condensation; determination of material properties (thickness of the film, thermal conductivity, heat transfer coefficient, shear stress etc.), properties of state of operation (velocity-distribution, vapor/liquid volume fraction, critical velocity of steam, etc.), state of flow (layered, annular, spray) [3,4]; development of evaluation methods for the signals of the special sensors (volume flow meter operating as a condensator, flow meter based on dynamic pressure measurement, mass flow meter based on an acoustic approach). In the paper the calculation method and formulas developed for the characterisation of a two-phase stratified flow in the network instrumented with classical and special measurements sensors are presented. The construction and development of the above devices and methods have provided the strategic background for the establishment of an intelligent monitoring and expert system. References 1 L. Szakonyi, "Identification and computer aided supervising system integration of a regional steam-water network", Acta Agraria Kaposváriensis, University of Kaposvár, Hungary, (in Hungarian) Vol. 10, No. 1, pp. 157-162, 2006. 2 L. Szakonyi, "Developing of an info-communication technology for regional energy-distribution", Symposium on Informatics in Higher Education, Debrecen, Hungary, (in Hungarian), pp. D4 (p.12), 24-25. Aug. 2005. 3 L. Szakonyi, I.A. Jancskar, Z. Sari, "Energetic model for an elementary unit of a steam network", Pollack Periodica, An International Journal for Engineering and Information Sciences. HU ISSN 1788. 1994. Akadémiai Kiadó, Budapest, Vol. 1, No. 3, pp. 91-102, 2006. 4 L. Szakonyi, "Energetic model of an elementary pipe-segment of a steam-water network", Pollack Periodica, An International Journal for Engineering and Information Sciences. HU ISSN 1788. 1994. Akadémiai Kiadó, Budapest, Vol. 2, No. 1. pp. 63-78, 2007. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £95 +P&P)
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