SciELO - Scientific Electronic Library Online

 
vol.12 número2Estimación del coeficiente de transferencia de calor global a bajas presiones en un condensador helicoidal integrado a un transformador térmicoDetección de fallas en un intercambiador de calor, utilizando observadores por modos deslizantes de segundo orden índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

  • Não possue artigos similaresSimilares em SciELO

Compartilhar


Revista mexicana de ingeniería química

versão impressa ISSN 1665-2738

Resumo

HERNANDEZ-DIAZ, W.N. et al. Coffee grain rotary drying optimization. Rev. Mex. Ing. Quím [online]. 2013, vol.12, n.2, pp.315-325. ISSN 1665-2738.

The objective of the present work was to determine the coffee bean Guardiola dryer operating conditions that minimized the energy consumption (Q) and maximized the process thermal efficiency. A mechanistic coffee bean drying model was solved for a complete mixed assumption to simulate the drying. The simulated results reproduced the experimental results obtained with a 7.60 m3 Guardiola dryer loaded with 2675 kg of wet green coffee grains. The thermal second law efficiency of the drying was calculated with an expression that takes into account the exergy air carries before entering the dryer. For the same coffee load, and with restrictions on grain's temperature (Tβ < 45°C), final water content (Xβ < 11%) and water activity (aw < 0.80), the drying was simulated for several air fluxes and temperatures to find the optimum drying conditions (Tγ = 80°C and Gγ =6560 kg air.h-1). A 15.80% reduction in energy consumption was achieved when optimization results were compared with the normal operation conditions.

Palavras-chave : optimization; thermal efficiency; drying; exergy; coffee.

        · resumo em Espanhol     · texto em Inglês     · Inglês ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons