ENERGY EFFICIENCY AND PERFORMANCE OF A COFFEE GRAIN DRYER USING CONCURRENT AND COUNTER-CURRENT FLOWS

Authors

  • Samuel Martin
  • Jadir Nogueira da Silva
  • Adílio Flauzino de Lacerda Filho
  • Daniel Marçal de Queiroz
  • Fabio Luiz Zanatta

DOI:

https://doi.org/10.13083/reveng.v17i6.138

Keywords:

Pós-colheita, secador, café

Abstract

This study was done to evaluate the performance and energy efficiency of a coffee grain dryer using concurrent and counter-current air flow. The first concurrent flow drying stage was separated from the second counter-current flow stage by a repose chamber. The first drying treatment was characterized by intermittent drying with mixing with the air at 45°C, and the second by intermittent drying with continuous reflux at the air at 70°C. In the first drying system initial and final moisture contents were 33.9 ± 5.0 and 11.8 ± 0.7% (w.b.), respectively, compared to 29.0 ± 3.6 and 11.6 ± 1.0% in the second treatment. The grain temperature remained within the recommended values for coffee. Intermittent drying, with continuous mixing, at 70°C consumed less energy compared to the intermittent drying with intermittent mixing at 45°C, and there was greater specific energy consumption in tests where the drying was concluded in few hours after the repose period.

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Published

2009-12-17

How to Cite

Martin, S., Silva, J. N. da, Lacerda Filho, A. F. de, Queiroz, D. M. de, & Zanatta, F. L. (2009). ENERGY EFFICIENCY AND PERFORMANCE OF A COFFEE GRAIN DRYER USING CONCURRENT AND COUNTER-CURRENT FLOWS. Engineering in Agriculture, 17(6), 454–461. https://doi.org/10.13083/reveng.v17i6.138

Issue

Vol. 17 No. 6 (2009)

Section

.

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