DEVELOPMENT OF THE ALGORITHM FOR CLIMATE CONTROL SYSTEM OF A TRUCK CABIN TO ENSURE ITS HIGH ERGONOMIC CHARACTERISTICS
This paper examines the relevance of equipping trucks with air conditioning systems. For European and Chinese consumers, this option is the norm and becomes a necessity in the domestic truck market. When creating a climate system for a truck, an air conditioning unit (ACU) is selected at the beginning in terms of heat and cooling capacity, as well as air supply to the cabin. The kinematic connections between the dampers are deciphered according to the design documentation. The NX CAD tools have determined the dependence of the angle of rotation of the air distribution and mixing control flaps on the angle of rotation of the electric actuator. To carry out numerical studies of the characteristics of the ACU, the computational domain of the ACU is used, which includes the ACU channels for the air circuit, the cores of the heat exchangers and the liquid circuits. The finite-volume model of the computational areas of the elements of the ACU was obtained using the grid generator ANSYS MESH. The model is a hybrid mesh consisting of hex, tet and prizm elements between the elements of which the interface data transfer surfaces are assigned. The computational model for hydraulic, gasdynamic and thermal calculation of the ACU was developed in the ANSYS CFD software package and includes boundary conditions, turbulence models and solver settings. The Shear Stress Transport (SST) turbulence model was used to simulate the flow of a viscous incompressible fluid in ACU with a high Reynolds number. Heat transfer between the computational mesh of the air loop and for the fluid loop was modeled using a double cell model. As a result, the fields of static pressure, streamlines and temperature fields in the air conditioning unit were obtained. Algorithms for controlling air temperature in a climate control unit by mixing airflows have been developed.