RESULTS OF NUMERICAL SIMULATION OF GEOTHERMAL COOLING IN THE VENTILATION SYSTEM OF ANIMAL PREMISES

The microclimate of livestock premises is determined by a set of physical, chemical and biological parameters inside the premises for keeping animals and is characterized by the following parameters: air temperature, internal surfaces of walls, ceilings, floors, windows, doors, and other internal structures; humidity of air, internal surfaces of walls, ceiling, floor, windows, doors, and other internal structures; the speed and direction of air flows in the locations of animals, manure, inflow and exhaust channels, windows and doors; the gas composition of the air - the concentration of carbon dioxide, ammonia, hydrogen sulfide, carbon monoxide; the presence of dust and microorganisms in the air; the intensity of natural and artificial lighting; optical radiation; the level of industrial noise, the degree of air ionization. Modern microclimate creation systems include subsystems: ventilation system - provides regulation of the gas composition and partly the air temperature (in the summer) in the room; air conditioning and heating systems - provide air temperature regulation in the room. Currently, various methods of cooling supply air are used in pig farming and can be divided into two types: vapor compression cooling units, so-called split systems and water evaporative cooling systems. However, additional cooling of the forced air into the pig house can be obtained using the geothermal effect. The purpose of the research is to substantiate the expediency of the geothermal cooling process in the ventilation system for injecting clean air in piggery premises. As a result of research, the physico-mathematical apparatus of the geothermal heating process in the fresh air injection ventilation system, which is based on the equations of continuity of air flow, Navier-Stokes equations, heat transfer equations, initial and boundary conditions, is generalized. The results of the verification of the numerical modeling of the geothermal heating process in the ventilation system of clean air injection in the Star CCM+ software package are given. As a result of the simulation, the distribution of the temperature field and the vector field of air flow velocities in the ventilation system for injecting clean air was obtained, and the feasibility of the geothermal cooling process was proven.