DefinePK

Abstract

A simplified procedure is proposed for estimating the actual value of the reduced resistance to the heat transfer of a building’s outer enclosing structures using two methods: a contact method and a non-contact method. The first method consists in isolating thermally homogeneous levels on the thermogram, measuring the value of the heat flux density, the temperatures of the outer and inner surfaces in each level, calculating the resistance to heat transfer. The second method is based on monitoring the temperatures of the indoor and outdoor air for the building's facade in question (or for an isolated floor), calculating heat transfer resistances of points isolated for analysis from the thermogram array. In both methods, the value of the reduced resistance to heat transfer is estimated as a weighted average of the levels (or the array of points) of the thermogram. The technique can be successfully used for thermal engineering surveys of buildings.