Dual-channel digital control of energy consumption and air supply in microclimate systems of livestock premises

Abstract

Abstract The problem of livestock premises air environment parameters ensuring in terms of temperature, humidity and CO2 gas content, established by zoo technical standards, is considered. The problem is formulated as a problem with non-linearity object and consists in its phase (temperature, humidity and CO2 gas content) coordinates stabilizing by the premises heating capacity and its air exchange intensity controlling. A mathematical model of control object’s dynamics parameters based on material flows and energy balance equations is developed. A cyclic algorithm for this problem solving has been developed, it consists of two successive stages: the control search this problem solving, and the found control establishment until any of the coordinates’ phase go beyond the established limits due to disturbances.The search for the control vector consists in periodic relay switching of its coordinates from specified maximum to minimum values so that the phase coordinates remain in the region of permissible variation. It is shown that the control vector corresponding coordinates as their average values for the switching cycle are defined. A block diagram of the control system implementing the developed algorithm is presented. The calculation data are given for a pigsty for 1300 animals.