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An experimental and numerical study about a typical solar air collector is presented. Transfer equations are deduced from thermal balance on each component of the solar collector. The numerical model is validated with experiments performed with a typical air collector; realized and tested under meteorological condition of Algiers, Algeria. Results obtained, for a collecting area AC = 2 m2 and air...
With 2200 kW/year/m2 of sunshine (National Office of Meteorology - Algeria), Algeria enjoys favorable climatic conditions to use the sun as a source of thermal energy for drying agricultural products. Indeed drying offers the possibility of recovery of surplus fruits and vegetables by their conservation for future consumption. Indirect drying gives better results (nutritional and taste viewpoint)...
The pyrolysis of cornstalk was studied by using Pyris-ITGA thermogravimetric apparatus with the heating rates of 20, 40, 60, 80, 100K/min and final temperature of 1073 K. Through the analysis of TG and DTG, the results show that the pyrolysis process of cornstalk includes four steps: drying, pre-pyrolysis, mainpyrolysis and carbonization; As the heating rate increased, both the maximum pyrolysis rate...
The experimental research was carried out about process of SO2 removal in flue gas using white lime slurry atomization, and with the method of non-contact on-line measuring for SO2 concentration in riser. The temperature distribution of slurry atomization drying was measured by new sandwich structure thermocouple with air pump. The results showed: The maximum SO2 removal and temperature decreasing...
Simulation model for sinter mixture's drying process was established and validated with the tunnel drier experiment. On this basis, hot blast temperature and flow rate, sinter bed's porosity factor and particle diameter are analyzed. The result shows that the effects of hot blast temperature and flow rate are far larger than the effects of sinter bed's porosity factor and particle diameter. Hot blast...
Schisandra Chinensis is a traditional Chinese medicine. The effects of dried schisandra impact the medicinal value and economic benefit of schisandra directly. Presently, studies on the characteristics and uses of schisandra chinensis are reported frequently in China. However, the studies of factors on the influencing drying effect of schisanda chinensis have not been reported. In this paper, the...
LG type vacuum freeze dryer vapor captor is taken as the study object, and a mathematical model of frost heat transfer of the vapor captor was established, the effective heat capacity method was used to simulate the heat transfer processes of vapor captor. Frosting mechanism under low temperature and low pressure condition was investigated, and the changing relation curves of temperature distribution,...
In recent years microwave drying has been studied as an extended method of drying to obtain high quality products including fruits, vegetables and grains. Major advantages of microwave drying of foods are higher drying rate, energy saving and uniform temperature distribution giving a better product quality. As yet the kinetics of microwave drying process has been investigated by means experiments...
A mathematical model describing the coupled heat and mass transfer inside porous media during convective drying was established, based on thermodynamic theory. An experimental system had been established to validate the precision of dynamic mathematical model. The experimental data of moisture content and temperature inside potato were compared to the simulated values, showing a good agreement. Variation...
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...
The conventional PID control of most processes has good control effect and robustness. Without adaptive capacity and prone to elicit inertia delay, this method can only be applied in a special working condition. This paper puts forward a composite fuzzy PID control method based on the establishment of fuzzy rules and the compound of PID controller, as well as the cascade PID controller regulation...
A fluidized bed microwave drying system was proposed for paddy drying. It consisted of two applicators which each had four perpendicular slots. The applicator was excited by two magnetrons. The analysis of electric field intensity distribution when paddy orientation was taken into account revealed that suitable paddy density in the applicator volume is 40%. Then, an investigation on the cumulative...
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