The application of numerical modeling is considered to solve the problems of radiation heat exchange in structurally inhomogeneous two-phase media which are realized during the combustion of fuel in boiler units atmospheric emissions from air carriers when they move at supersonic speeds. The optically active ingredients of the gas phase of the combustion products have a sharp selection of spectral absorption lines (radiation) which causes a difference in the spectral transmission functions for selective radiation from the spectral transmission functions for non-selective radiation (gray body). In the presence of a dispersed phase of the combustion products acute selection is subjected to such a parameter of the radiation propagation medium as the probability of quantum survival. The number of spectral lines determining the spectral transmission functions increases with temperature and is determined by hundreds of thousands of lines at high temperatures. In this paper we consider a closed simulation of radiation heat transfer in combustion chambers when the temperature field in the combustion chambers is calculated first and then the flux of thermal radiation to the tube heat-receiving surfaces.
Transition to a new approach related to use of facades and roofs entirely made of glass in building construction called for an additional analysis to evaluate an issue of how to ensure an interior climate. In the article have been investigated the factors, which make people feel uncomfortable in the pavilions with large glazing areas: cold air flow near glazing area, which occurs on the cold surfaces of the windows, going down and along the floor, radiation heat exchange between human beings and building envelopes, condensation on internal glazing surfaces.
Numerical modeling of radiation heat exchange in combustion chambers and heat exchangers of power installations