Assessment of different revolving time combinations on coffee grains drying using a fixed-bed dryer / AvaliaÃÃo de diferentes combinaÃÃes de tempo de revolvimento, em secador de camada fixa para cafÃ

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

This assignment aimed to value the energetic efficiency on coffee drying (Coffea Arabica, L.), with different combinations of time revolvment on a fix layer dryer. The experiment was developed on July, 2004 in Jesuitas city, ParanÃ. The dryer was compound of: a drying chamber with a capacity to 4,5 m3 of grains, chamber plenum with volum of 2,9 m3, fan with leakage of 473,2 m3 mim-1, two motors with potency of 2 cv (one for the drive of the fan and another one for the drive of the revolvment system) and mechanical system with shovels, that kept the product in horizontal rotatory revolvment. The grainÂs contents of damp were gotten by the standard method of greenhouse 105Â1ÂC for 24 hours. The sampleÂs collection was carried out with a collector segmented on four different points of the drying chamber at each two hours. The temperature and the airÂs damp were gotten through digital thermhigrometer, installed in a meteorological shelter. The drying airÂs temperature was 75ÂC. The ventilation and the drying kept it continuous during the test, having as treatment the timeÂs interval and revolvment of one hour, two hours, three hours and continuous revolvment. It was observed the revolvment with intervals of three hours promoted the smaller energy electric (17,11 kWh) and firewood consume (208,25 kg). The average of the energetic efficiency between the treatments was 12,30 MJ kg--1. for the model of dryers used it is recommended the utilisation of the revolvment system with intervals of three hours and continuous dryer, considering that had not been difference in the final quality of the product in sensorial analysis

ASSUNTO(S)

energy instalaÃÃes para o preparo coffea arabica, l. coffea arabica, l secagem drying energia agronomia coffee preparing buildings

ACESSO AO ARTIGO

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