The scope of this thesis was to study the thermal behaviour of an helical coil heat exchanger inserted in an Joule Brayton cycle with an external combustor feeded by biomass. This thesis was structured in three main parts: the first part is a library research on thermo dynamic correlations for shell and tube heat exchangers and thermo dynamic and fluid dynamic models similar to the one studied in this thesis. The second part shown the develop of a model, done with the support of Matlab, used to confirm the actual performance and to predict the performance of the heat exchanger working under modified conditions. The last part consists in the analysis of the corrosion behaviour of the high temperature cyclic oxidation of the AISI 310 stainless steel
Lo scopo di questa tesi è stato l’analisi termica di uno scambiatore elicoidale a doppia elica inserito in un ciclo Joule Brayton con combustore esterno alimentato a biomasse. Il lavoro è suddiviso in tre parti: la prima è una ricerca bibliografica volta ad individuare metodi e modelli di analisi termo-fluidodinamica di scambiatori di calore di tipo affine a quello oggetto dello studio, la seconda presenta la costruzione di un modello, implementato con Matlab, atto a riprodurre le prestazioni attuali della macchina da un lato e dall’altro a consentire un’ analisi parametrica; la terza consiste nello studio del comportamento all’ossidazione dell’acciaio AISI 310 con ciclaggio termico ad alte temperature.
Analisi termica di uno scambiatore di calore a tubi elicoidali per impianti alimentati a biomassa
VILLA, PAOLO
2013/2014
Abstract
The scope of this thesis was to study the thermal behaviour of an helical coil heat exchanger inserted in an Joule Brayton cycle with an external combustor feeded by biomass. This thesis was structured in three main parts: the first part is a library research on thermo dynamic correlations for shell and tube heat exchangers and thermo dynamic and fluid dynamic models similar to the one studied in this thesis. The second part shown the develop of a model, done with the support of Matlab, used to confirm the actual performance and to predict the performance of the heat exchanger working under modified conditions. The last part consists in the analysis of the corrosion behaviour of the high temperature cyclic oxidation of the AISI 310 stainless steelFile | Dimensione | Formato | |
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https://hdl.handle.net/10589/107662