THE LONGWAVE RADIATIVE HEAT-TRANSFER OF THE BUILDING ENVELOPES

The longwave radiative heat transfer between outside surface of the building envelopes and the thermal environment, is treated in this paper as interesting from the point of view of the studies of the influence of the atmospheric counterradiation on the heat balance of low-sloped roofs and walls. This influence may be taken into account by means of introducing a correction that would lower outside air temperature values. This paper presents the way of calculating this correction (temperature depression) as well as the factors influencing its values. The paper submits also quantitative analysis of the influence of the longwave atmospheric radiation upon the net radiative heat loss of the low-sloped roofs and walls as a function: the thermal resistance of the building partitions, the emissivity of their outside surfaces, wind speed, the sky, the outdoor and the indoor air temperature values.