EMPD-Based Moisture Buffering Quantification with Moisture Dependent Properties (І): Modelling and Simulations

Materials with excellent moisture buffering performances have considerable application potential in the future developments of building moisture design. The appropriate application of building materials is determined via the effective assessment of their hygroscopic performance, however, currently available test methods (e.g., moisture buffer value test) can evaluate only the moisture buffering abilities of materials under limited circumstances. Advanced numerical prediction methods (e.g., heat, air and moisture transfer (HAM) models) are not practical because of unavailable hygrothermal properties and excessive computation times. Integrating the effective moisture penetration depth (EMPD) model with an inverse approach allows both identifying and predicting the effect of moisture buffering on room conditions effectively and efficiently. This paper reports that the existing EMPD models have limited application conditions, and hence proposes a modified two-layer EMPD model considering both the moisture-dependent hygric properties of materials and reasonable moisture transfer resistance distributions. A novel dynamic moisture test is presented in terms of typical moisture fluctuations in office buildings. Compared to standard hygric property tests, the combination of the inverse approach and the dynamic moisture test can extract key parameters of EMPD models efficiently and effectively. Thus, the actual performance of materials can be accurately predicted for wider spectrum of conditions. The precision of the modified EMPD model and proposed approach is validated by comparing the numerical predictions with both the measured results and HAM results. This method, with the advantages of a simple test procedure, low experimental cost, high test efficiency, and wide applicable range, is advisable for practical applications.

Jaar van publicatie:2021

BOF-keylabel:ja

IOF-keylabel:ja

BOF-publication weight:6

CSS-citation score:1

Auteurs:International

Authors from:Higher Education

Toegankelijkheid:Open