Abstract
This paper reports a numerical approach for modelling the thermal behavior and heat accumulation/liberation of sustainable cementitious composites made with Recycled Brick Aggregates (RBAs) employed as carriers for Phase-Change Materials (PCMs). In the framework of the further development of the fixed grid modelling method, classically employed for solving the well-known Stefan problem, an enthalpy-based approach and an apparent calorific capacity method have been proposed and validated. More specifically, the results of an experimental program, following an advanced incorporation and immobilization technique, developed at the Institut für Werkstoffe im Bauwesen for investigating the thermal responses of various combinations of PCM-RBAs, have been considered as the benchmark to calibrate/validate the numerical results. Promising numerical results have been obtained, and temperature simulations showed good agreement with the experimental data of the analyzed mixtures.
Highlights
The energy demand for heating and cooling the global building stock represents a massive part of the total energy consumption around the world (≈ 40%) [1]
The numerical simulations are based on the assumption that the Phase-Change Materials (PCMs)-Recycled Brick Aggregates (RBAs) mortars can be considered as a continuum and homogenous media
It is based on the mixture theory by using the volume percentages of each individual component such as RBAs, cement paste and PCMs
Summary
The energy demand for heating and cooling the global building stock represents a massive part of the total energy consumption around the world (≈ 40%) [1]. In the EU, it accounts for about half of all energy consumption [2]. To attenuate this number, thermal efficiency of construction and building elements, like walls, roofs, and floors, has become the most important measure to enhance energy savings of the new and existing building stock. With the introduction of the 2019/2021 EU Buildings Directive, it has been emphasized that new buildings of the EU-Member States have to be designed as “Nearly-Zero-Energy Buildings” from the beginning of 2021 onward [3].
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