Rotating heat exchangers are used in steel industry, air conditioning and thermal power plants to pre-heat air used in steam generators or for waste heat recovery. Here we focus on a rotating heat exchanger on a so-called Ljungström arrangement operated in thermal power plants to pre-heat the air fed to the steam generators. In these devices the heat exchange between two fluids is achieved through a rotating matrix that gets in contact alternatively with the two fluid streams and acts as a thermal accumulator. To increase the heat capacity and the overall exchange surface, the rotating matrix is filled by a series of folded metal sheets. In the paper we de-scribe a methodology to account for the effects of the Ljungström in a virtual test-rig implemented in a Computational Fluid Dynamics environment. To this aim, a numerical model based on the work of Molinari and Cantiano was derived and implemented in the OpenFOAM library. RANS numerical results were compared with those of a mono-dimensional tool used by ENEL to design Ljungström heat exchangers and validated against available measurements in a real configuration of a thermal power plant.

A CFD-based virtual test-rig for rotating heat exchangers / Corsini, Alessandro; Delibra, Giovanni; Di Meo, Giulio; Martini, Mirko; Rispoli, Franco; Santoriello, Andrea. - ELETTRONICO. - 82:(2015), pp. 245-251. (Intervento presentato al convegno 70th Conference of the Italian Thermal Machines Engineering Association, ATI 2015 tenutosi a roma) [10.1016/j.egypro.2015.12.029].

A CFD-based virtual test-rig for rotating heat exchangers

CORSINI, Alessandro;DELIBRA, GIOVANNI
;
RISPOLI, Franco;SANTORIELLO, ANDREA
2015

Abstract

Rotating heat exchangers are used in steel industry, air conditioning and thermal power plants to pre-heat air used in steam generators or for waste heat recovery. Here we focus on a rotating heat exchanger on a so-called Ljungström arrangement operated in thermal power plants to pre-heat the air fed to the steam generators. In these devices the heat exchange between two fluids is achieved through a rotating matrix that gets in contact alternatively with the two fluid streams and acts as a thermal accumulator. To increase the heat capacity and the overall exchange surface, the rotating matrix is filled by a series of folded metal sheets. In the paper we de-scribe a methodology to account for the effects of the Ljungström in a virtual test-rig implemented in a Computational Fluid Dynamics environment. To this aim, a numerical model based on the work of Molinari and Cantiano was derived and implemented in the OpenFOAM library. RANS numerical results were compared with those of a mono-dimensional tool used by ENEL to design Ljungström heat exchangers and validated against available measurements in a real configuration of a thermal power plant.
2015
70th Conference of the Italian Thermal Machines Engineering Association, ATI 2015
rotating heat-exchanger; ljungstrom; CFD; synthetic methods; openfoam
04 Pubblicazione in atti di convegno::04b Atto di convegno in volume
A CFD-based virtual test-rig for rotating heat exchangers / Corsini, Alessandro; Delibra, Giovanni; Di Meo, Giulio; Martini, Mirko; Rispoli, Franco; Santoriello, Andrea. - ELETTRONICO. - 82:(2015), pp. 245-251. (Intervento presentato al convegno 70th Conference of the Italian Thermal Machines Engineering Association, ATI 2015 tenutosi a roma) [10.1016/j.egypro.2015.12.029].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/969209
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