MONITORING OF TRANSIENT TEMPERATURE AND THERMAL-STRESSES IN PRESSURE COMPONENTS OF STEAM BOILERS

Two methods of solving the transient inverse heat conduction problens in complex shaped elements are presented in this paper. The time-space temperature distribution in whole element cross-section is reconstruc ted using the measured temperature histories at several points placed inside the element or on its easily accessible outer surface. Thermal stresses are then evaluated involving Finite Element Analysis. In both methods the heat transfer coefficient at the element inner surface is the unknown value. Four examples are presented, two for one method sh owing the high accuracy of the presented methods and possibility of th eir practical application. (C) 1997 Elsevier Science Ltd.