Determination of the optimal weight during drying of materials microwave energy supply

DETERMINATION OF THE OPTIMAL WEIGHT DURING DRYING OF MATERIALS MICROWAVE ENERGY SUPPLY

Zulkumar Masharipova, associate professor at the department of informatics, automation and control of the Tashkent institute of chemical technology

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Ravshan Boboyorov, associate professor at the department of informatics, Automation and Control of the Tashkent Institute of Chemical Technology
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Alisher Jabborov, is a senior lecturer at the department of informatics automation and control of the Tashkent institute of chemical technology
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Aziza Maksudova, is a senior lecturer at the department of informatics automation and control of the Tashkent institute of chemical technology
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Muazzam Madraximova, Urgench State University tutor
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Abstract
The drying process is a complex process, since heat and mass transfer processes occur simultaneously throughout the volume of material to be dried. The results of determination of the equilibrium state of the various factors affecting the drying process, as defined by the differential equations describing the temperature variation of the gas and solid phase change material and humidity. On the basis of differential equations drawn up computer models of processes in MATLAB program. Made a comparison of research findings on the physical and computer models.

To make optimal use of the dryer, saving energy determined the optimal weight of the product to be dried. When discrete dried material supply microwave energy to change the amount of moisture contained mass changes are reflected in the test results.

Key words: mass transfer, dryer, microwave, physical model, in the gas phase, the solid phase, the computer model, weight, temperature
The drying process requires a lot of energy and a long process of optimizing the temperature profile of the main technological challenge. Food to optimize the drying process should be able to solve the problem of temperature drying mode. Constant temperature in the process of determining the mode of drying material in nature (structural, organaleptic, physical and chemical) and the maximum amount you need to save natural properties.
Thus, not only during the construction of the heat transfer process in accordance with the technological characteristics and was able to look at the process that created it.
The drying process of a physical model experiments were conducted to find the weight of the material. The parameters of the experiment factor:
1) Moisture content in the material to be dried;
2) drying of the material to be dried regime;
3) article drying time.
Experience covers for "Spanish" and select varieties of potatoes, pumpkins, samples 5 mm and 10 mm thick, 100 g, 200 g number of pieces. Setting initial weight of material to be dried, 0.1kg (100gramm) and the initial moisture content of the material is 84%. Ovens as a high frequency generator, which is equal to the power of 0.9 kW microwave power generator and used by special direction of the key.
Microwave energy mode in the drying process is a discrete manner. The drying process for the realization mode using a computer model used in the process, and a drying mode is selected. Changes in temperature limit set 50⁰С-70⁰С. Samples of the furnace chamber, packed the camera, make sure the door is firmly closed after the equipment is installed magnetron microwave heating as a result of the effect of material samples and increasing the temperature of the material. The chamber includes a microwave energy transmission while fans will start with the air inside the chamber from the moisture separated from the product. Camera in air flow rate is 0.5 kg / s. The duration of the material in the process of warming computer models will continue for some time. Power is supplied to the chamber is stopped after a predetermined time and then the furnace, the temperature of the material were measured, sampled, and weighed humidity varies depending on the weight of the material.
Upon receipt of the temperature of the material to be dried is 50⁰С, energy intensive process continued. The total weight of the desired weight (depending on the amount of dry matter) until he continued. The test results are shown in Table 1.
The length of the column 1 of the table, column 2 of the experimental device, the change in mass (m_eksp), in column 3, the calculated values(m_through), 4-column shows the difference between the calculated values with the experimental values (_{ } = m_eksp-m_through),
At the same time, it defines this: