Aerodynamic protection of hangars against cold ingress through apertures

Aerodynamic protection of apertures in buildings effectively counteracts cold ingress while doors are open. Aerodynamic protection systems are classified as full or partial. Full systems are characterised by virtually complete localisation of the aperture and elimination of its influence on the air-heat regime (AHR) of the premises. The air curtain and infiltration protection systems are full systems. Partial aerodynamic protection systems (SAP) are used where full protection systems are technically impossible or economically inexpedient to implement. SAP reduces the quantity of external air entering the premises, but does not remove the influence of the aperture on the AHR. The physical-mathematical model of AHR of premises with large apertures is developed in terms of microclimatic variables. The resulting algorithm determines the current air temperature, the temperatures of surfaces of gates and plant, the optimal capacity of the peak heating system and SAP, and the time taken to re-establish steady-state microclimatic conditions. The application of the program is illustrated by an example of calculation for a hangar building.