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• W4230678918 abstract "Wang-Sang Lee Professor Wang-Sang Lee from Gyeongsang National University (GNU) in South Korea, talks to Electronics Letters about the paper ‘Four-kWatt Homogeneous Microwave Heating System Using a Power-Controlled Phase-Shifting Mode for Improved Heating Uniformity’, page 465. Microwave (MW) ovens are commonly used as a cost effective and convenient solution for heating, drying, cooking, and sterilising ceramics, electronic materials, and so on. A MW oven is adapted to radiate microwaves generated by means of a MW supply (commonly magnetrons) to the inside of a metal heating applicator, thereby causing a material to be heated by radiated microwaves within the heating applicator (MW cavity). While designing a continuous MW belt dryer, we have found that the uniform heating characteristic is the core technology of the MW dryer. Can you describe the background to the work performed and the advance reported in your Electronics Letters paper? In conventional MW ovens, the non-uniformity of the electromagnetic-field distribution within the MW cavity is the primary drawback, in that homogeneous MW heating of an object cannot be achieved. This can produce improper heating due to hot and cold spots within the MW cavity. A non-uniform MW distribution within the heating cavity causes uneven MW heating, which results in a degraded drying performance and magnetron damage. As a result, the maintenance cost of the MW dryer system is increased, and even the durability and reliability of products using microwaves are lowered, which is a growth-inhibiting factor on the related market. By controlling the input power of each MW source of multiple waveguides, a method of improving the heating uniformity was proposed in a previous study. In this case, careful control of the operation mode is required for the improved uniformity characteristics as the heating characteristics of the specific region exist depending on the respective operation modes. Moreover, effectively uniform MW heating distribution of the dielectric material is achieved using multiple MW sources since the electric field distribution depends on the size of the MW cavity and the location of the MW source in the MW cavity. For improved uniform MW heating, we propose a power-controlled phase-shifting mode in multiple MW generators for improved heating uniformity without physical alteration of a MW cavity in this letter. Basically, increased temperature caused by MW heating depends on the internal electric field intensity at 2.45GHz in the MW cavity. For the electric field calculation, there has been a great deal of difficulty in mathematically modelling the electric field strength due to multiple reflections by the object to be dried and the metal body in the MW cavity with multiple waveguides. We achieved the improved heating uniformity discussed in our Letter by using a commercially available three-dimensional electromagnetic field analysis tool for multiple signal sources with different input signals. To realise the phase shifting mode, waveguides having a length of 90 degrees phase difference are used. From the proposed power-controlled phase-shifting mode, uniform heating distribution is achieved by reducing the hot and cold spots in the microwave cavity. The experiments demonstrated that in comparison to a conventional mode with simultaneous multiple inputs, the proposed mode can achieve an improved heating uniformity of approximately 64.4%. In the short term, product performance due to temperature uniformity improvement in all MW heating systems, such as MW ovens, MW conveyor-belt dryer, and so on, can be improved and will result in energy savings. In the long term, improved life span of magnetrons will increase the possibility of development in related markets due to the reduction of maintenance costs and the increased reliability of related products. The development of microwave heating technology can be expanded to a variety of applications such as waste recycling, ceramics, high-temperature material plasticity, and food drying. To improve the performance of drying technologies, microwave-based hybrid drying technologies have been gradually expanding. The hybrid dryer can be manufactured in various forms such as microwave and hot air drying, microwave and infrared drying, microwave and vacuum drying. This dryer design requires the consideration of venting holes and other slits which cause microwave performance degradation. In addition to improving the performance of the dryer in practical applications, we are also considering ways to reduce the manufacturing cost of a microwave dryer. Recently, MW heating technologies have been applied to various fields, and the related market is growing rapidly. As a result, the manufacturing cost has been reduced and the market is further expanding. Due to high product and installation costs in industrial MW dryers, the ease of maintenance and durability, as well as the drying performance of the product, become important features for new products. Furthermore, active MW dryers provide a cost-effective and efficient solution that overcomes the problem of non-uniform heating in conventional MW systems. In the future, there will be autonomous MW dryers in related markets, which are not only superior in energy efficiency but also capable of drying based on the characteristics of heated materials." @default.
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• W4230678918 date "2019-04-01" @default.
• W4230678918 modified "2023-10-16" @default.
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• W4230678918 doi "https://doi.org/10.1049/el.2019.0996" @default.
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