Abstract
Heat exchangers for heating liquid media are used in agricultural, food and other industries. Infrared heating appears to be the most effective and energy-efficient way of thermo-processing of agricultural products. When exposed to infrared radiation, energy transfers directly from the radiation source to the liquid in the absence of contact between them. The density of the heat flux on the surface of the material is significantly higher than with convective and conductive heating. Infrared radiation penetrates into material, which eliminates local overheating and undesirable structural changes of the surface layer (decomposition and burning of the liquid). It is appropriate to carry heating of the product in a thin layer by infrared irradiation, when the entire portion of the liquid is processed. Devices with thin-layer fluid flow can be made according to various schemes depending on the location of the energy source and its shape. Most installations have a similar geometric design: two axial cylinders, one of which is an emitter and the other is a heated liquid product. (Research purpose) The research purpose is developing an engineering method for calculating thermal and geometric parameters of installations for the treatment of a thin layer of liquids by infrared irradiation with axial cylindrical surfaces. (Materials and methods) The article presents the process of radiation heat exchange between the radiator and the liquid flow in a thin layer along the inner surface. (Results and discussion) An equation describes the physical characteristics of the system: the performance, the radiator surface temperature, the initial temperature of the liquid product, the optical characteristics of the radiator and the treated liquid, the liquid heating temperature at the output and the geometric parameters of the installation with axial cylindrical surfaces. (Conclusions) The presented engineering calculation methods reflect the maximum possible conditions of radiant exchange in heat exchange units of this type for heat treatment of agricultural products. The theoretical error of the calculated energy and structural parameters of the designed installation when using the considered methods does not exceed 10 percent.
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