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This paper addresses the concrete mode of using the energy of the microwave field in the drying process of wooden sticks used in the food industry. For the numerical analysis of the microwave field we used the COMSOL Multiphysics numerical modelling programme. The experimental measurements were performed using a multimode applicator. The aim of this paper is to present a study on the microwave field...
Chinese fir was taken as specimen in this paper. Firstly, specimens were preheated to 80°C, and then the pressure in the drying box was vacuumized to the needed vacuum degree (absolute pressures were 0.06, 0.04 and 0.02MPa respectively), finally, pressure in the drying box was recovered to the atmospheric pressure by vapor from wood during drying period. The results indicated that the drying rates...
The control problem of Wood Vacuum Dehumidifier is very complicated. A PID control method based on RBF neural network algorithm is designed. The controller is based on the conventional PID control, . makes use of the study ability of the nerve network to turning the PID control parameters, and proceeds the simulation research using matlab software. From the simulation results, it is can be shown that...
A research project was completed which demonstrated the use of a new design of electric heat pump in a softwood lumber drying operation. Data was collected over one year of kiln operation at a lumber mill in Georgia. Results showed an average Coefficient of Performance of 2.69.
Japanese Sugi (Cryptomeria japonica D. Don) wood was dried by superheated steam under the temperature of 140, 160, 180 degree C and the relative humidity of 100% to make wood flooring. Moisture absorption and desorption characteristics and chemical composition of treated wood were analyzed to investigate the dimensional stability at saturated and dry ambient condition. The results showed that the...
Waste wood, a renewable energy source is used as feedstock for Universiti Teknologi Malaysia's newly-developed two-stage incinerator system. The research goals are to optimize the operation of the thermal system, to improve its combustion efficiency and to minimize its pollutants formation. During experimental work, the feedstock will undergo four different processes; drying, devolatilisation, gasification...
Two methods of reduction of microwave power reflection from a wood stack are studied theoretically. The first method consists in choice of such slope angle of the radiating aperture at which a phenomenon of the Brewster takes place. The second method is based on application of the metal grid located between an radiator and a stack. The optimum relations for a choice of a grid cell size and a grid...
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