Abstract
The renovation of old building facades should be performed mainly considering the building energy demand reduction. For this purpose, it is necessary to select retrofitted solutions that should be able of minimizing heat losses through walls. However, it is not only the nominal thermal transmittance that influences the amount of heat transported through the wall, but also the moisture content within the walls under in- service conditions. The main objective of this paper is the evaluation of the influence of the moisture content on the energy performance of retrofitted walls. A numerical study using the software WUFI Pro was carried out to quantify the influence of wind driven rain on the thermal transmittance of different wall assemblies exposed to different climates and orientations. This study reports the transient thermal transmittance of different retrofitted wall solutions as a function of moisture content.
Highlights
The renovation of old building facades should be performed on the basis of the reduction of energy consumption in order to reduce the building energy demand and the related greenhouse gas emissions
In the case of a building located in Krakow, wind-driven rain from the west results in even several times the increase of moisture content in relation to the southern orientation
Based on a comparison of the simulation results of a single-layer wall that is completely protected from wind-driven rain and with the added internal insulation, it can be determined that the maximum increase in moisture caused by this effect is around 1 kg /m2 of wall
Summary
The renovation of old building facades should be performed on the basis of the reduction of energy consumption in order to reduce the building energy demand and the related greenhouse gas emissions. For this purpose, it is necessary to select a retrofitted solution capable of minimising heat losses through the walls. The energy performance of exterior walls can be considerably worsened by the presence of moisture content in porous layers. When porous material pores are filled with water, their thermal conductivities increase [1,2,3,4,5,6]. As a matter of fact, several experimental and numerical studies have investigated the effect of moisture on the thermal transmittance values of different walls and concluded that the increase in moisture content in a wall can considerably increase the thermal transmittance values [7,8,9,10,11,12]
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