N2 - The following paper presents the method for solving one-dimensional
inverse boundary heat conduction problems. The method is used to estimate
the unknown thermal boundary condition on inner surface of a thick-walled
Y-branch. Solution is based on measured temperature transients at two
points inside the element's wall thickness. Y-branch is installed in a
fresh steam pipeline in a power plant in Poland. Determination of an
unknown boundary condition allows for the calculation of transient
temperature distribution in the whole element. Next, stresses caused by
non-uniform transient temperature distribution and by steam pressure
inside a Y-branch are calculated using the finite element method. The
proposed algorithm can be used for thermal-strength state monitoring in
similar elements, when it is not possible to determine a 3-D thermal
boundary condition. The calculated temperature and stress transients can
be used for the calculation of element durability. More accurate
temperature and stress monitoring will contribute to a substantial
decrease of maximal stresses that occur during transient start-up and
shut-down processes.
JO - Archives of Thermodynamics
L1 - http://rhis.czasopisma.pan.pl/Content/94260/PDF/13_paper.pdf
L2 - http://rhis.czasopisma.pan.pl/Content/94260
IS - No 3 December
EP - 200
KW - Inverse method
KW - Transient temperature
KW - Heat transfer coefficient
KW - Stress distribution
ER -
A1 - Grądziel, Sławomir
PB - The Committee on Thermodynamics and Combustion of the Polish Academy of Sciences
JF - Archives of Thermodynamics
SP - 191
T1 - Determination of temperature and thermal stresses distribution in power boiler elements with use inverse heat conduction method
UR - http://rhis.czasopisma.pan.pl/dlibra/docmetadata?id=94260
DOI - 10.2478/v10173-011-0022-4