- Tytuł:
- Optimum heating of cylindrical pressure components weakened by holes
- Autorzy:
-
Dzierwa, P.
Taler, J. - Powiązania:
- https://bibliotekanauki.pl/articles/240098.pdf
- Data publikacji:
- 2012
- Wydawca:
- Polska Akademia Nauk. Czytelnia Czasopism PAN
- Tematy:
-
kotły
naprężenie termiczne
normy
odwrotne zagadnienia przewodzenia ciepła
optymalizacja nagrzewania
zbiorniki ciśnieniowe
boiler standards
heating optimization
inverse heat conduction problem
pressure vessels
thermal stress - Opis:
- A method for determining time-optimum medium temperature changes is presented. The heating of the pressure elements will be conducted so that the circumferential stress caused by pressure and fluid temperature variations at the edge of the opening at the point of stress concentration, do not exceed the allowable value. In contrast to present standards, two points at the edge of the opening are taken into consideration. The first point, P[1], is located at the cross section and the second, P[2], at the longitudinal section of the vessel. It will be shown that the optimum temperature courses should be determined with respect to the total circumferential stress at the point P[2], and not, as in the existing standards due to the stress at the point P[1]. Optimum fluid temperature changes are assumed in the form of simple time functions. For practical reasons the optimum temperature in the ramp form is preferred. It is possible to increase the fluid temperature stepwise at the beginning of the heating process and then increase the fluid temperature with the constant rate. Allowing stepwise fluid temperature increase at the beginning of heating ensures that the heating time of a thick-walled component is shorter than heating time resulting from the calculations according to EN 12952-3 European Standard. @eng
- Źródło:
-
Archives of Thermodynamics; 2012, 33, 3; 111-121
1231-0956
2083-6023 - Pojawia się w:
- Archives of Thermodynamics
- Dostawca treści:
- Biblioteka Nauki
Artykuł