Otimização exergetica de um sistema coletor-armazenador de calor latente / Exergetic optimization of a collector-storage system of latent heat

AUTOR(ES)

Santiago del Rio Oliveira

DATA DE PUBLICAÇÃO

2008

RESUMO

This work deals with the exergetic optimization of a solar thermal energy system. This consists of a solar collector and a rectangular water storage tank that contains a phase change material distributed in an assembly of slabs. The study takes into account both conduction and convection heat transfer modes for water in the solar collector, and also the phase change process for the PCM in the storage tank. Thus, in the solar collector, optimal output temperature and optimal mass flow rate are determined as a function of solar radiation conditions. Moreover, for the storage tank, optimal melting temperature and the maximum power output taking into account the phase change process are determined. The melting process in a PCM is analyzed by means of an approximated analytical solution. Finally, energetic and exergetic analysis were done for each system component and for the overall system, and efficiencies of first and second law of thermodynamics were calculated. Results of a numerical case study are presented and discussed

ASSUNTO(S)

latent heat exergetic analysis energia - armazenamento otimização coletores solares energia solar solar collector optimization phase change material

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