This paper presents two simplified and approximated relations of heat transfer effectivneness for steam condenser. The proposed relations of heat transfer effectivneness are a function of the measured and reference parameters. Correctness of relations were verified on the basis of data from the characteristics and measured data for the 200 MW steam condenser. A comparison of the outlet cooling water temperature calculated from the proposed relations and Beckman formula were performed. Formula proposed by Beckman for steam condenser of heat transfer effectivneness, in simplified form, is a function of saturation temperature, mass flow rate of cooling water and the reference parameter. It contains two constant exponents, which must be determined on the basis of the measured data. To assess the accuracy of the correlations the average value and standard deviation were used. The proposed correlations have simpler forms, but are slightly less accurate compared to the Beckman correlation.
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The paper presents a mathematical model of a steam condenser in the changed conditions. A list of independent parameters on which the water temperature at the outlet from the steam condenser depends was selected and by means of the Buckingham theorem a functional relation between two dimensionless quantities was obtained. The exact form of the function was determined on the basis of data from the characteristics of steam condenser for a 200 MW power plant and actual measurement data for dierent condenser operating in a power plant of 200 MW. A linear relation between two dimensionless quantities was obtained. The correctness of the proposed relation was examined by comparing the measured temperature and calculated temperature from the proposed relation.
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The study presents the possibility of applying the Buckingham Π theorem to modeling high-pressure regenerative heat exchangers in changed conditions. A list of independent parameters on which the water temperature at the outlet of the heat exchanger depends was selected; and by means of the Buckingham Π theorem a functional relation between two dimensionless quantities, where there is no overall heat transfer coefficient, was obtained. The exact form of the function was determined on the basis of actual measurement data and a linear relation between two dimensionless quantities has been obtained. The correctness of the proposed relation was examined for two high-pressure regenerative exchangers for a 200MW power plant.
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