Модернізація вентиляційної системи пташника на основі новітніх технологій

This article presents the idea of modernizing ventilation systems to maintain microclimate in poultry houses. Supporting the necessary microclimate is a necessary factor for increasing productivity. At the same time, an important problem is the search for new approaches and principles for solving the problem of cooling and heating of tidal air of poultry houses in the summer and winter. This problem is especially important due to the decrease in the productivity of the poultry farm due to the imperfection of existing microclimate systems in the summer, in the presence of high temperature and humidity of external air. The purpose of which is the development and numerical modeling of the shell and tube heat exchanger of the new design, as the main element of the ventilation system. Numerical simulation of hydrodynamic processes and processes of heat transfer in channels with a compact placement of tube beams is made. For this purpose, the CFD modeling method was used and the ANSYS Fluent program was applied. The basis of the mathematical model is the Navier-Stokes equation, the energy conservation equation for convective currents and the continuity equation. In the calculations a standard k-e turbulence model was used. In all calculations, the volume flow of air is 86392 m3 / h. The heat carrier has been selected air with a temperature of +40 0С at the inlet, which flows in the channels for cooling external heated air in the poultry house in the summer period of the year, where as the cooler is used water underground wells. In the soybean, cold water moving inside the pipes, which has an incoming temperature of +10 0С. The layout of the heat carrier movement is cross-linked. The work looks at the shell and tube heat exchanger with a rectangular cross section in the transverse flow of pipe beams. The geometry of the pipes with diameters d =10 mmis peculiar, which differs from the traditional chess, corridor and compact beams. Neighboring pipes in such close beams are displaced one relative to the other at a distance of1 mm. Moreover, we consider three types of beam construction, in which there is a displacement of pipes in a transverse direction along the entire length of the tube beam at10 mm,12 mmand15 mm. Computer-aided mathematical modeling of heat and mass transfer processes in tubes of different geometries with compact placement of pipes using the ANSYS Fluent program complex was carried out. The conditions of the hydrodynamic flow in the channels were analyzed and estimates of the heat transfer intensity between the hot and cold coolant through the wall separating them. The most effective heat transfer surfaces have been determined and the promise of application of the proposed conduits of the beams of pipes in the design of heat exchangers of various applications is shown. Computer simulation gives an opportunity to analyze the conditions of hydrodynamic flow and heat transfer in the studied channels. The pressure drop reaches up to 700 Pa, the output temperature to +24 oC, which fully complies with the technical design standards. However, as in each system there is a drawback, and this is the financial cost of purchasing and cutting pipes, welding TA. Table 3 shows that for the manufacture of such a TA, 6120 m of pipe is required. Such expenses justify themselves by increasing the weight of poultry in the summer period of the year and reducing the use of gas in the winter period of the year. Keywords: heat exchanger, numerical simulation, heat-mass transfer, tube bundle, inter-pipe channels