Studying temperature and moisture conditions of building envelopes using a condensation nomogram

Abstract

The current article presents a graph of the dependence of the condensation temperature on the internal air temperature and relative air humidity, as well as the calculation of the temperature difference of the building envelopes. The purpose of the study is to construct a graph of the dependence of the condensation temperature and calculate the temperature difference between the temperature of the inner surface of the building envelope at the required resistance to heat transfer and the temperature of the inner surface of the building envelope at which condensation occurs. A formula for calculating the condensation temperature has been derived. Based on the calculation data, tables of the dependence of the condensation temperature on the relative air humidity and internal air temperature were obtained, and a graph of the dependence of the condensation temperature was constructed. Also, a formula of the internal surface temperature at the required resistance to heat transfer using the Fourier and Newton-Richmann laws was obtained. As a result of the performed calculations, tables with the difference in internal surface temperatures at the required resistance to heat transfer and condensation temperatures for walls, ceilings, floors, and windows were presented.