Aerodynamic and hydraulic calculations – time-consuming and important steps in the design of engineering systems. There are many different programs for the calculations of heating and ventilation systems. Such as Autodesk REVIT, software, dramatically gaining popularity in the field of BIM-modeling. Design engineers using this software package for the calculations, are faced with the problem of mismatch of diameters, pressure loss between the program and manual calculation. In this regard, it was necessary to understand this problem: compare the calculation results of velocity and pressure losses in the air ducts and pipings in the program REVIT with traditional methods of calculation, find out what formulas calculates this program . The calculations in software Autodesk REVIT have an errors and inaccuracy. Backed by Russian standards, it is necessary will understand how accurate and correct calculations produces software package. The work examines the results hydraulic and aerodynamic calculations, analysises this results with the results of calculations by traditional methods. Calculations in software Autodesk REVIT is applicable for calculating systems of ventilation, but for calculating systems of heating better not to use this program. For the bold use calculations of program is necessary improvement of the software.

Keywords: BIM-technologies, Building Information Model, Autodesk REVIT, software, BIM-modeling, aerodynamic calculation, hydraulic calculation, system of ventilation, system оf heating, comparative analysis