The numerical modelling of spectators and performers’ comfort in large concert halls was considered. The research shows that numerical modeling of air velocity and temperature helps to make a justified choice of technical solutions for ventilation and air conditioning systems and to examine their operation under extreme mode of service as well.

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The modelling of the working cycle of a closed cycle power installation with real gas is considered. The properties of a real gas are investigated using carbon dioxide as an example. The indicators of the real thermodynamic cycle of the installation when working on carbon dioxide are investigated. Particular attention is paid to the simulation of heat transfer in the recuperator.

A mathematical model of carbon dioxide isobaric flow under supercritical pressure in the condition of a constant heat flux on the surface of a cooled pipe is discussed. Criterion dependencies for heat transfer are analyzed. The effect of greatly variable heat capacity is shown. A method has been developed for taking this factor into account in numerical calculations. Areas are found with the so-called degraded heat transfer.