Development of The Experimental Stand With Centrally Located Specimen For The Investigation of Heat and Moisture Phenomena in Porous Building Materials

Cieślikiewicz, Łukasz; Wąsik, Michał; Kubiś, M.; Łapka, Piotr; Bugaj, Marcin; Pietrak, Karol; Wiśniewski, Tomasz; Furmański, Piotr; Seredyński, Mirosław

doi:10.2478/ceer-2019-0005

Cited by 8 publications

(3 citation statements)

References 21 publications

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“…Their further development will be also related to their validation. It will be performed with experimental stands which are under development and testing and which were described in recent publications [15] and [16].…”

Section: Resultsmentioning

confidence: 99%

Investigation of the equilibrium and non–equilibrium models of heat and moisture transport in a wet porous building material

et al. 2019

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In the paper the equilibrium and non-equilibrium models of moisture transport across the wet building material are proposed and compared. The equilibrium condition between gaseous and liquid moisture phases in the first model is relaxed in the second one, where evaporation and condensation are driven by the difference between the actual moisture partial pressure and its saturation value. In both models moisture is assumed in the gaseous phase as well as continuous (funicular) and discontinuous (pendular) liquid phase. Moreover, the transport of moisture is tightly coupled with heat transfer, which is treated as the fully equilibrium process in both models. The proposed models are verified with numericalresults available in literature, namely with temporal variation of temperature in selected location in the building material. Additionally, predicted with both models temporal changes of the moisture content in three selected points and the total moisture content are compared. Both models produced similar results.

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Section: Resultsmentioning

confidence: 99%

Investigation of the equilibrium and non–equilibrium models of heat and moisture transport in a wet porous building material

et al. 2019

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“…Their further development will also be related to their validation. It will be performed with experimental stands which are under development and testing and which are described in recent publications [19,20].…”

Section: Discussionmentioning

confidence: 99%

Analysis of Non-Equilibrium and Equilibrium Models of Heat and Moisture Transfer in a Wet Porous Building Material

et al. 2020

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In the proposed paper, non-equilibrium and equilibrium models of heat and moisture transfer through wet building materials are presented and compared. In the former, the mass transfer between liquid and gaseous moisture results from the difference between the partial pressure of water vapor and its saturation value. In the second model, the equilibrium between both phases is assumed. In the non-equilibrium model, liquid moisture can be in the continuous (funicular) or discontinuous (pendular) form. The transfer of moisture for each proposed model is tightly coupled with the energy transfer, which is assumed to be an equilibrium process. The time step and grid size sensitivity analysis of both numerical models are performed primarily. The verification of the model is based also on the numerical data available in literature. Finally, obtained with considered models, temporal variations of moisture content in three locations in the computational domain are compared. Reasonable conformity of results is reported, and discrepancies related to differences in formulations of models are discussed.

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“…The most problematic as well as time-and energy-consuming step is the first step of the renovation of wet walls, in which masonry walls are dried by applying different techniques (e.g., convective [4][5][6], vacuum [7] or microwave drying [2,8]). Therefore, in order to improve the overall efficiency of the masonry wall renovation process, the drying step should be optimized.…”

Section: Introductionmentioning

confidence: 99%

Efficiency Comparison between Two Masonry Wall Drying Devices Using In Situ Data Measurements

Łapka

Cieślikiewicz

2021

Energies

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In this paper, an in situ investigation and comparison of energy consumption and efficiency of two devices for implementation of the thermo-injection masonry wall drying method are presented. The following drying devices were considered: the currently used device (CUD) and the novel prototype device (NPD) with optimized control of the operating parameters. The historic building subjected to the drying and renovation was located in the city of Łowicz (Poland). The temperature and relative humidity of the air in several points in the basement and the temperature and moisture content at various locations in the considered masonry wall segments, as well as the electrical parameters for both devices, were measured in the real time and registered by applying a dedicated data acquisition system. The specific energy consumption during drying, defined as the energy consumption divided by the length of the drying wall section and by the mean volumetric moisture content change in the wall, was equal to 16.58 and 10.44 kWh/m/moisture content vol.% for the CUD and NPD, respectively. Moreover, the moisture content in the wall decreased by an average of 2.13 and 3.22 vol.% for the CUD and NPD, respectively, while the temperature of the wall surface in the drying zone was increased to approximately 35–40 °C and 40–65 °C for the CUD and NPD, respectively. The obtained results showed that the NPD was much more efficient than the CUD and that the building renovation process may be more environmentally friendly by applying more efficient drying devices and strategies.

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Development of The Experimental Stand With Centrally Located Specimen For The Investigation of Heat and Moisture Phenomena in Porous Building Materials

Cited by 8 publications

References 21 publications

Investigation of the equilibrium and non–equilibrium models of heat and moisture transport in a wet porous building material

Investigation of the equilibrium and non–equilibrium models of heat and moisture transport in a wet porous building material

Analysis of Non-Equilibrium and Equilibrium Models of Heat and Moisture Transfer in a Wet Porous Building Material

Efficiency Comparison between Two Masonry Wall Drying Devices Using In Situ Data Measurements

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