Modelling Porous Cementitious Media with/without Integrated Latent Heat Storage: Application Scenario

Mona Nazari Sam (), Jens Schneider and Holger V. Lutze
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Mona Nazari Sam: Department of Civil and Environmental Engineering, Institute IWAR, Chair of Environmental Analytics and Pollutants, Technical University of Darmstadt, 64297 Darmstadt, Germany
Jens Schneider: Institute of Structural Mechanics, and Design (ISM+D), Technical University of Darmstadt, 64297 Darmstadt, Germany
Holger V. Lutze: Department of Civil and Environmental Engineering, Institute IWAR, Chair of Environmental Analytics and Pollutants, Technical University of Darmstadt, 64297 Darmstadt, Germany

Energies, 2023, vol. 16, issue 18, 1-20

Abstract: This paper presents a methodological approach for the evaluation of the thermal behavior of cementitious porous media with/without integrated latent-heat thermal energy storage (LHTES). To achieve this goal, the Lewis-Nielsen model has been calibrated to predict the insulation properties of mineralized foamed concretes. Two pore-related microstructural fitting parameters, A and Φ m , are presented according to the available data in the literature. In this regard, new findings are implemented for the classification of pore structure and prediction of the homogenized thermal conductivity of two-phase cementitious foams with or without phase change materials. The calibration and predictive analyses have been extended to a wide range of experimental data, including variation of binder types, porosities, and latent components. The presented analytical approach appears to agree well with experimental results and can be employed in the design of two-phase mineral foam materials. Then, to assess the thermal behavior of the predicted insulating envelopes, a one-dimensional (1D) enthalpy-based model is used which combines Fourier’s law of heat conduction, the first law of thermodynamics, Lewis-Nielsen conductivities, and the mixture theory for LHTES additions. The results demonstrated the importance of volumetric heat capacity for the thermal inertia of building envelopes.

Keywords: latent heat thermal energy storage (LHTES); thermal energy storage (TES); porous media; cementitious foam; conductivity prediction; Lewis-Nielsen model; Fourier’s law; dynamic envelopes; energy efficiency (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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