Contribution to analytical and numerical study of combined heat and moisture transfers in porous building materials

2011 ◽  
Vol 46 (7) ◽  
pp. 1354-1360 ◽  
Author(s):  
K. Abahri ◽  
R. Belarbi ◽  
A. Trabelsi
Keyword(s):  
Building Materials ◽  
Numerical Study ◽  
Porous Building Materials ◽  
Heat And Moisture

scholarly journals Numerical modelling of a hemp concrete wall

2019 ◽  
Vol 85 ◽  
pp. 08003 ◽  
Author(s):  
Georges Costantine ◽  
Chadi Maalouf ◽  
Tala Moussa ◽  
Guillaume Polidori ◽  
Elias Kinab
Keyword(s):  
Building Materials ◽  
Moisture Transfer ◽  
Numerical Study ◽  
Object Oriented ◽  
Hysteresis Phenomenon ◽  
Energy Costs ◽  
Concrete Wall ◽  
Heat And Moisture ◽  
Account Heat ◽  
Indoor And Outdoor

In a global warming context associated to the abuse of energy consumption, actual researches focus more and more on reducing energy costs in the building sector. This target could be achieved by using innovative building materials, such as hemp concrete, due to its positive impacts on thermal and environmental levels. The aim of this work is to carry out a numerical study of a hemp concrete wall subjected to several indoor and outdoor conditions of temperature and relative humidity using the program object oriented SPARK. The hygrothermal behaviour of the wall is investigated taking into account heat and moisture transfer within the wall as well as hysteresis phenomenon between the sorption and desorption curves and their temperature dependency.

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

2019 ◽  
Vol 29 (1) ◽  
pp. 53-65 ◽  
Author(s):  
Łukasz Cieślikiewicz ◽  
Michał Wasik ◽  
Michał Kubiś ◽  
Piotr Łapka ◽  
Marcin Bugaj ◽  
...  
Keyword(s):  
Building Materials ◽  
Closed Loop ◽  
Rotation Speed ◽  
Control Parameters ◽  
Porous Building Materials ◽  
Preliminary Results ◽  
Operation Conditions ◽  
Experimental Stand ◽  
Heat And Moisture ◽  
Air Streams

Abstract The paper presents development of an experimental stand with centrally located specimen for the investigation of heating and drying processes in porous building materials. Additionally, the paper contains preliminary results of measurements which test and verify the assumed operation conditions of the stand. In order to control parameters of air which was used to heat and dry the specimen, the stand was operating in a closed loop and was equipped with several elements, i.e., the cooler (humidity condenser), fan with variable rotation speed, humidifier and heater. Moreover, the stand consisted of two square and parallel ducts with air streams which had identical parameters. This allowed for two measurements at the same time.

HYSTERESIS AND TEMPERATURE DEPENDENCY OF WATER VAPOR SORPTION

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Ruta Miniotaite
Keyword(s):  
Building Materials ◽  
Moisture Sorption ◽  
Water Vapor Sorption ◽  
Temperature Dependency ◽  
Adsorption And Desorption ◽  
Porous Building Materials ◽  
Heat And Moisture Transport ◽  
Almost All ◽  
Heat And Moisture ◽  
Sorption Characteristics

Moisture in porous building materials plays an important role in almost all durability problems. The sorption characteristics of building materials exhibit hysteresis in the way the equilibrium curves develop between adsorption and desorption. The sorption curves are also somewhat temperature-dependent. These facts are most often neglected in models for combined heat and moisture transport in materials. This study provides the sorption isotherm and its hysteresis of different porous building materials. The paper seeks to contribute to the knowledge base about such sorption characteristic by presenting some new measurements of hysteresis and temperature dependency of the moisture sorption characteristics of different porous building materials: concrete, porous concrete, cement plaster, limes cement plaster, brick, and spruce. Scanning curves are measured for all materials where periods with adsorption and desorption interrupt each other intermittently between 0% and 97% of relative humidity.

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