Simulated Air Flow Rate Effects on Drying Times and Costs for Conventional and Recirculating Peanut Drying Facilities

摘要

In conventional nonrecirculating peanut drying systems, an air flow rate of 10 m~3/min-m~3 is recommended. Drying systems utilizing air.reeirculation need not consider the inefficiency associated with unsaturated air exiting the system, since the extra drying capacity of the air will eventually be utilized. As a result, the air flow rate recommendation for recirculation type drying systems needs to be reexamined. In this study, two computer models were modified to simulate the peanut drying process in a solar-assisted partial air recirculation drying system and a conventional drying system, respectively. The weather data from the 1992 drying season atLewiston, NC and the parameters of both facilities were used as the input data for the models. Air flow rates of 5, 7.5, 10, 12.5, 15, 17.5, 20, and 22.5 m~3/min-m~3 were examined. The simulation results showed that the effect of air flow rate on dryingtimes and costs in a solar-assisted partial air recirculation peanut drying facility was significant. When the air flow rate was increased, the seasonal drying capacity, the electrical and fuel consumption, and total or specific drying cost increased aswell. On the other hand, drying time for each wagon decreased and total energy consumption remained relatively constant.