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Acta Scientiarum. Agronomy

versão On-line ISSN 1807-8621

Resumo

GRECO, Marcelo; CAMPOS, Alessandro Torres  e  KLOSOWSKI, Elcio Silvério. Thermal losses in coffee dryer. Acta Sci., Agron. [online]. 2010, vol.32, n.2, pp.209-212. ISSN 1807-8621.  http://dx.doi.org/10.4025/actasciagron.v32i2.3676.

This study aimed to evaluate the temperature reduction in the external parts of a fixed-bed coffee dryer, by means of different combinations of revolving times, using a noncontact thermometer. The experiment was developed in the month of June 2004 at a farm located in Jesuítas, Paraná State, Brazil. Coffee (Coffea arabica L.) variety IAPAR 59 was used. The dryer used was of the fixed-bed model, with metallic drying chamber, with cylindrical format, with an adapted grain revolving system. It was observed that there was a thermal reduction of 156.7ºC (79.1%) in the system going from the furnace to the drying chamber. The combination that provided smaller reduction of temperature was with continuous ventilation and 40 minutes revolving interval at every 3 hours until the end of the process. The combination that provided the greatest reduction in temperature was with continuous revolving, with a reduction of 81.09% in the surface temperature of the product.

Palavras-chave : loss of temperature; drying; coffee; fixed bed.

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