Structural Drying >> Hurricane Ceiling Leak Fix

Note that this requirement is not very satisfactory. At the end of a water absorption experiment, i.e., when the moisture front has reached the sample top, a moisture content profile is still present over the sample. Leaving the sample in water contact for a longer period of time slightly increases the overall moisture absorbed, Hurricane Ceiling Leak Fix but does not equilibrate this moisture profile entirely. 

A perfectly uniform moisture distribution will, hence, hardly be established. However, the discussion shows that possibly a high and practically reachable moisture content should be used as initial condition for the drying experiment. Sample Height (5) The sample height is already part of the equation. It is, Hurricane Ceiling Leak Fix though, recommended to use sample heights according to the laboratory practice. 

This means 1 to 10 cm (ca 0.4 to 4 in.), depending on the material, Hurricane Ceiling Leak Fix should typically be used. The height of the sample determines the duration of the overall drying and the information content to be gained from the data. A material like concrete with a very low liquid conductivity has a short first and a very long second drying phase. 

For a drying experiment on concrete, a small sample height is suitable. A material like ceramic brick, Hurricane Ceiling Leak Fix on the other hand, has a high capillary conductivity. Here, drying experiments would provide more meaningful results when higher sample heights are used. Discussion of the Influences The initial moisture content and the sample height remained somehow unclear in their impact on the first drying phase duration. 

Therefore, some additional calculations were performed for aerated autoclaved concrete, Hurricane Ceiling Leak Fix where both sample height and initial moisture content were varied. The results are shown in Figure 5. The top charts in Figure 5 show results where the drying was started from a moisture content lower than capillary saturation. Two interesting effects can be seen in these charts. 

One is that the first drying phase duration does follow the sample height in square-root form. The other effect is that there appears to be a threshold sample height up Hurricane Ceiling Leak Fix to which a relationship exists between first drying phase duration and sample height. Samples higher than this threshold have all the same first drying phase duration. 

The lower charts of Figure 5 show Hurricane Ceiling Leak Fix results where the drying was started from capillary saturation. Sample heights up to 50 cm were chosen to illustrate that for this material and these conditions, the first drying phase duration shows a more-or-less square-root dependence to the sample height. The explanation for this can be found in the moisture transport processes occurring during the first drying phase. 

This drying phase is characterized by a linear drying Hurricane Ceiling Leak Fix throughout the whole material sample. A clear moisture profile does not yet form. The first drying phase ends when a distinct moisture profile establishes inside the material. The moisture content at which this happens is called critical moisture content. 

If the moisture content at the beginning of the drying is smaller than the critical moisture content, the first drying phase consists only of the formation of a moisture profile. This affects only the boundary range of the material. For samples higher than the affected range, Hurricane Ceiling Leak Fix this becomes independent of the sample height. We can observe this in top charts of Figure 5. 

If, at the other extreme, the drying starts at a moisture content very much higher than critical moisture content, Hurricane Ceiling Leak Fix the linear drying without establishing a moisture profile is the main process. Its length is characterized by the amount of water to be dried out linearly. This is directly proportional to the sample height, and we observe a linear relationship between first drying phase duration and sample height. 

This is the case for the brick shown in Figure 2 at the right. For cases in between these two extremes, Hurricane Ceiling Leak Fix the first drying phase is partly characterized by a linear drying and partly by the establishment of a distinct moisture profile. For such cases we do not see a linear behavior but a relationship that does, more or less, follow a square-root behavior over the sample height (Figure 5, bottom charts). 

To confirm this reasoning, Hurricane Ceiling Leak Fix the differential equation of moisture diffusion (Equation 2) was solved analytically for an infinite plate. (2) where is the moisture content and D is the moisture diffusivity. The results of the analytic solution are shown in Figure 6. They were obtained for constant boundary conditions and a constant moisture diffusivity. 

For the exact steps of this analysis, Hurricane Ceiling Leak Fix refer to Scheffler (2008). The left-side chart of Figure 6 presents the development of the boundary moisture content over time for different sample heights (each line corresponds with one sample height). It becomes apparent that there is an upper bound that is not exceeded. 

Once reached, the course of boundary moisture content is independent of the sample height. The rightside chart of Figure 6 confirms this. Here, the first drying phase duration is plotted versus sample height. For the chosen conditions of this analysis, Hurricane Ceiling Leak Fix the first drying phase duration becomes height independent at around 15 cm (5.9 in.). Two conclusions can be drawn from these analyses. 

First is that the first drying phase does not have a clear dependence on the sample height, which could be used for the definition of a drying coefficient. Second is the summary of influences Hurricane Ceiling Leak Fix and dependencies of the drying process, which is compiled in Table 1. INTRODUCTION OF A NEW DRYING COEFFICIENT We have shown that the first drying phase duration is not a suitable measure for a drying coefficient. 

The derivation of a drying coefficient still has to cope with the different dependencies of the drying process. Numerical simulation has proven to be a valuable tool of such investigations, Hurricane Ceiling Leak Fix as climatic influences can easily be controlled. 

Indeed, if boundary temperature and relative humidity are kept constant and, for simplicity, a one-dimensional problem is assumed, only the following parameters remain: material properties, initial moisture content, Hurricane Ceiling Leak Fix and drying height. These have to be combined in a single-number drying coefficient.

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