EXPERIMENTAL RESEARCH AND CFD MODELING OF MODULAR POULTRY BREEDING

For high-quality and simultaneous breeding of different ages of poultry a modular keeping is proposed. The heating system of the module is a panel infrared heater. It is intended for local heating of technological area. Design dimensions of the module were determined for reasons of qualitative course of technological process, namely the stocking density of poultry. Experimental studies of the temperature regime of poultry breeding area were carried out. Body temperature of the poultry was within acceptable limits, up to 41.5ºC. In addition, the surface temperature of the feathers did not exceed 29.1ºC, which fully complies with sanitary and hygienic standards. For a better representation of temperature regime in the module, CFD modeling was performed. Fields of velocities, pressures and temperatures were obtained. The air temperature near poultry in the module reached 18.6ºC, and the average velocity did not exceed 0.75m/s.

Natural research of the thermal process on the surface of irradiation by infrared heater

Comfortable conditions for people to stay in the production room with the use of infrared emitters depend on the uniform distribution of temperatures over the entire area of the irradiation zone. Therefore, the purpose of the research was to determine experimentally the temperature on the irradiation surface with an infrared heater and to summarize the results, for their further use in the design of infrared heaters in various production facilities. The distribution of temperatures on the irradiation surface was determined by the method of experimental studies. To derive the patterns of temperature field distribution on the irradiation surface, the experiment was carried out at variable power of the infrared heater Qheat, W, the height of its installation H, m and different blackness degrees of the floor surface εfloor, which depends on the floor material. The graphical distribution can prove the regularity of that heat in solid materials is distributed due to thermal conductivity – from particles with higher temperatures to less heated. Using mathematical methods of experimental data processing, experimental dependences were approximated to determine the relative temperature of the irradiation surface. The temperature gradient obtained graphically is directed along the normal to the isothermal surface in the direction of increasing temperature. This approach enables considering the development of process in the dynamics and allows the visualization of heating to adjust the basic parameters of process. Scientific results obtained in this work will allow developing a new methodological approach to the study of heating processes on the surface of irradiation by an infrared heater on the basis of a combination of physical and mathematical modeling, which can form an instrumental basis for the target study of such processes of formation of the thermal regime in production facilities. The thermal power of the infrared heater Qheat, W had the greatest influence on the value of the relative temperature of the floor surface tfloor. With constant values of the height of the heater, the blackness degree of the irradiation surface and with increasing the thermal power of the heater twice the value of the relative temperature of the irradiation surface increased by 9.7 %.

Development and Evaluation of an Infrared Heating System for Die Preheating

In this study, a high power infrared heater was implemented to preheat an H13 steel die used for high pressure die casting. The performance of the heating system was quantified experimentally by measuring die temperatures in various locations with embedded thermocouples. Heating time was reduced significantly by using a flat, stainless-steel reflector on one side of the heater. A numerical model was developed to simulate the infrared radiation heat transfer into the die. The model was validated against literature data and experimental results. The model was then used to evaluate different lamp configurations to obtain a more uniform heating distribution and to avoid hot spots on protruding surfaces. The validated model has proven to be useful in evaluating different lamp configurations tailored for specific die geometries or heating requirements.

Infrared heater warming system markedly reduces dew formation: An overlooked factor in arid ecosystems

ABSTRACTDew plays a vital role in ecosystem processes in arid and semi-arid regions and is expected to be affected by climate warming. Infrared heater warming systems have been widely used to simulate climate warming effects on ecosystem. However, how this warming system affects dew formation has been long ignored and rarely addressed. In a typical alpine grassland ecosystem on the Northeast of the Tibetan Plateau, we measured dew amount and duration by artificial condensing surfaces, leaf wetness sensors and in situ dew formation on plants from 2012 to 2017. We also measured plant traits related to dew conditions. The results showed that (1) warming reduced the dew amount by 41.6%-91.1% depending on the measurement method, and reduced dew duration by 32.1 days compared to the ambient condition. (2) Different plant functional groups differed in dew formation. (3) Under the infrared warming treatment, the dew amount decreased with plant height, while under the ambient conditions, the dew amount showed the opposite trend. We concluded that warming with an infrared heater system greatly reduces dew formation, and if ignored, it may lead to overestimation of the effects of climate warming on ecosystem processes in climate change simulation studies.