THERMAL BEHAVIOUR OF A HEAT EMITTING DEVICE IN UNSTEADY STATE

摘要

A "detailed" model of a heat emitter in hot water circulation hasrnbeen developed considering, two phases (liquid and metal), the nonrnlinear heat transfer and the enthalpy transport by the fluid. Arnreduced order state model ( order two or three) has been thenrnformed, linearising the initial "detailed" model and using a modelrnreduction technique developed in our laboratory which is especiallyrnbased on modal analysis. The simulated results from both thernmodels for a step input of the inlet temperature have beenrnpresented and discussed. The extension of the work in order tornidentify the parameters of the reduced order state model has beenrnhighlighted and further possibilities have been discussed. Finally,rnthis study should be able to define an optimum methodology forrnthe experimental characterisation of fluid circulation emittingrndevices