PL
 |
EN
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 3

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Content available remote Simplified and approximated correlations of heat transfer effectiveness for steam condenser
Laskowski R. M., Lewandowski J.
Journal of Power Technologies
|
2012
|
Vol. 92, nr 4
258--265
EN
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.
2
Content available remote A mathematical model of the steam condenser in the changed conditions
Laskowski R. M.
Journal of Power Technologies
|
2012
|
Vol. 92, nr 2
101--108
EN
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.
3
Content available remote The application of the Buckingham Π theorem to modeling high-pressure regenerative heat exchangers in off-desing operation
Laskowski R.M.
Journal of Power Technologies
|
2011
|
Vol. 91, nr 4
198-205
EN
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.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.