Numerical and experimental determination of in-structure temperature profiles

Abstract

When building physics simulations are done initial conditions express the actual hygrothermal state of building envelope. For the temperature field simulations initial condition is represented by the initial temperature in the body profile at the start of heat transfer. In-structure temperature varies quickly so temperature initial conditions are often neglected. Nevertheless in specific cases initial conditions have to be taken into an account even when simple temperature field simulations are done. The contribution shows various temperature initial conditions determination for insulated construction of outdoor test cell. Comparison of measured and calculated temperature profiles in structure shows correctness of start-up pre-calculation initial condition consideration.

Application of Chemical Grouting as an Option of Removing Soil Moisture - a Case Study in the Reconstruction of the Church

“…This lack of realized Directive WTA 4-4-96 authors who Directive introduced the term "degree of wet" assesses the content of moisture in the masonry due to its porosity. This means that in addition to the moisture content in percent by weight is necessary to provide each and the open porosity of the material [14]. The degree of wet Sp is defined by: Without pressure injection may be used up to the dampness of about 50% for pressure injection is referred to an upper limit of about 80% [18].…”

“…This means that the creation of new micro cracks are able to fill them, thus waterproofing practically never gets old. [13], [14] 3…”

The Influence of the Initial Condition in the Transient Thermal Field Simulation Inside a Wall

“…The measured parameters were: outdoor and indoor ambient air temperature and relative humidity; temperature and relative humidity inside the structure; surface temperature and heat flux. The room air temperature and relative air humidity were measured using a digital sensor, [28,29]. The weather station measured wind direction, wind speed, air pressure, air temperature and relative humidity, collisions, and also monitored global irradiation with Pyranometer, as shown in Figure 1.…”

“…Table 1. Structure of the investigated perimeter wall (from the inside, the layers are in the direction of the heat flow) [28,29].…”

Analysis of Air Flow in the Ventilated Insulating Air Layer of the External Wall

“…The main source of the processes taking places in the atmosphere as sunlight, so the effect of solar radiation on the air velocity in a ventilated air layer unquestionable [7]. The system of ventilated facades is based on venting the air gap with the thickness ranging from 20 to 50 mm located between thermal insulation and facade itself [2].…”