Investigation of the Influence of Wetting Ability of the Sprayed Surface of the Heat Exchanger on the Process of Evaporative Cooling Ivan Ignatkin, Nikolay Shevkun, Dmitry Skorokhodov Thermo, 2026 Ensuring the required microclimate parameters is the most critical task in hot climates. In pig farms, air cooling is provided by means of steam-compression chillers or evaporative cooling, which is the simplest way to cool the air. The implementation of evaporative cooling depends largely on the interaction of the media involved in this process. This paper considers the process of interaction of cooling water with the surface of a cellular polycarbonate heat exchanger. A mathematical model describing the process of wetting the sprayed surface of the heat exchanger is obtained. The authors determined the theoretical water flow rate required to provide air cooling for a given operation mode. Experimental trials of a recuperative heat recovery unit with a heat exchanger made of cellular polycarbonate equipped with a water evaporative cooling system were carried out. The authors conducted a comparative assessment to evaluate the effectiveness of evaporative cooling in a heat recovery unit equipped with a polycarbonate heat exchanger versus panel evaporative systems using wetted paper pads at pig farms in the Vladimir and Tambov regions of Russia. The panel evaporative coolers provided a temperature reduction of 11.3 °C without any splashing effect. Under the same operating conditions, the heat recovery unit achieved an inlet air temperature reduction of 10.5 °C, accompanied by splashing. When the water flow rate supplied for evaporation was reduced until the splashing ceased, the cooling temperature drop decreased to 10.1 °C, which is 11% lower, compared with the paper pads. The study revealed characteristic operating modes for the unit that ensure effective air cooling, depending on the cooling water flow rate. Since the prevailing temperature during the system’s main operating time is significantly lower than the design temperature (the absolute temperature maximum), to achieve effective cooling of the supply air without splashing or excessive water waste, the cooling circuit water should circulate at a flow rate within 40 to 63% of the maximum design value. Alternatively, an automated control system should be employed to regulate the water supply based on outdoor air temperature and humidity.
Developing and Testing the Air Cooling System of a Combined Climate Control Unit Used in Pig Farming Ivan Ignatkin, Sergey Kazantsev, Nikolay Shevkun, Dmitry Skorokhodov, Nikita Serov, et al. Agriculture Switzerland, 2023 This article presents the results of developing and testing the air-cooling system of a combined climate control unit used in pig farming. The authors have found a water-evaporative system to be the most efficient for cooling the air supply. Cooling systems of this type consume 0.003 kW/kW of electric power to produce 1 kW of cold. Based on the developed mathematical model for water-evaporative cooling in the combined climate control unit, the authors have determined that an air supply with a temperature of 31.2 °C and a relative humidity of 30.4% can be cooled by 8.3 °C when saturated with moisture to a relative humidity of 90.0% (by 11.7 °C at 100%). Experimental studies of the cooling system confirmed the theoretically obtained data.
Far North: Optimizing Heating Costs I. Yu. Ignatkin, N. A. Shevkun, A. S. Kononenko, V. Ryabchikova, V. Panchenko Lecture Notes in Networks and Systems, 2023
Economic evaluation of innovative engineering solutions in animal husbandry N V Sergeyeva, V N Arinichev, N A Shevkun, E A Ovsiannikova, Ya S Chistova Iop Conference Series Earth and Environmental Science, 2021 Many agricultural organizations are searching for innovative solutions in the engineering equipment of livestock premises in order to maintain an optimal microclimate in them. With stable keeping, the productivity of animals directly depends on the nutritional value of feed, a certain state of the air, temperature and humidity. The article provides a brief analysis of the indicators of economic activity of Temp LLC in the Kaliningrad region, whose main activity is dairy farming. A reduction in the productivity of dairy livestock and high growth rates of the cost of milk were revealed. Measures are proposed to maintain the microclimate in the cowshed using HB LED lamps and the PM-Kit curtain system controlled by automated Farm Management Support systems. The system allows to control many basic processes for animal care, but the article only covers lighting and air exchange. The measures will increase the average annual productivity of animals by 7.3% and reduce the cost of 1 cent. of milk by 4.6%.
