Estudo do Desempenho de uma Torre de RecuperaÃÃo de Calor com Canais SintÃticos de Poliuretano para um Dessalinizador Solar TÃrmico / Performance study of a heat recovery tower with synthetic (polyurethane) flow channels to operate in a solar desalination unit

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

23/04/2010

RESUMO

Because of the lack of drinkable water in various semi-arid regions and the necessary use of renewable energies, the present work presents a performance study of a heat recovery tower to operate in a solar desalination unit for decentralized water production. The solar desalination unit has two parts: a heating unit and a desalination unit.This work presents the field results with a desalination tower with synthetic (polyurethane) flow channels. The tower operation consists of the heating of salty water, the evaporation of desalinated water vapor in the lower stage, and the vapor condensation on the above stage. The condensate flows to a lateral channel to be collected, while the salty water in the trays is heated by the heat transfer processes, particularly the condensation from the tray below. The heating, evaporation, and condensation processes are repeated among the trays in a heat recovery mechanism. The results also show the correlation parameters for the Sherwood number, developed using the experimental data gathered in a temperature controlled laboratory desalination unit. This correlation was used as a reference in the study of heat recovery towers. The solar dealination system is working properly and showed a daily production of 35 liters. The results present the production per stage and the temperature profiles, in graphical form. For the performance parameters, a GOR value of 1,26 and a COP value of 4,78 were measured. The Sherwood correlation was used to compare experimental and simulated values.

ASSUNTO(S)

engenharia mecanica dessalinizaÃÃo da Ãgua energia renovÃvel energia solar dessalination renewable energies solar

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