Thermal delay simulation in multilayer systems using analytical solutions

Simões, I.; Simões, N.; Tadeu, A.

doi:10.1016/j.enbuild.2012.03.005

Cited by 23 publications

(14 citation statements)

References 11 publications

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“…It should be noted that the highest thermal delay values are reached when the screeds (or the ICB) are laid under the 30 mm thick concrete slab: Cases 2 and 4 exhibit greater thermal delays than 1 and 3, respectively, which means that the thermal delay increases with the number of layers, as also reported by Simões et al [5], particularly if those layers differ in terms of their thermal properties. The thermal delay is larger than 3 hours if there is a floating concrete slab.…”

Section: Thermal Delay and Thermal Transmittance Coefficient Of The Fsupporting

confidence: 55%

“…A full description of these equations can be found in one of our previous papers [5], where the 3D and the 2.5D solution for multi-layered systems has been proposed and validated against experimental results.…”

Section: Analytical Solutionsmentioning

confidence: 99%

“…It uses one-dimensional analytical solutions where the time variable is catered for by using a frequency domain approach. These solutions have been previously proposed and validated against experimental results by the authors ( [5], [31]). The technique uses the Green's functions for harmonic heat plane sources.…”

mentioning

confidence: 99%

“…However, as real conditions are mostly unsteady, in addition to providing good thermal resistance building elements should have the thermal capacity to attenuate and delay external temperature fluctuations. Simões et al [5] used an analytical model, validated with experimental results, to show the importance of cork layers in the thermal delay conferred by multilayer wall systems. Mathieu-Potvin and Gosselin [6] computed numerically the thermal shielding exhibited by an exterior wall containing layers of PCMs.…”

mentioning

confidence: 99%

“…phase change heat, temperature and the corresponding heat capacities. Simões et al [5] presented an analytical formulation to compute thermal delay in multilayer systems with insulating materials, such as cork, mineral wool and expanded polystyrene. The results prove that the contribution of the insulating material's properties to thermal delay is more relevant in systems composed of few layers.…”

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confidence: 99%

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Thermal delay provided by floors containing layers that incorporate expanded cork granule waste

Tadeu

Moreira

António

et al. 2014

Energy and Buildings

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This paper reports the computation of the thermal delay provided by concrete floors built with layers of cork and lightweight screed that incorporate expanded cork granule waste. The heat transfer by conduction across these multilayer systems is simulated analytically under unsteady boundary conditions. The thermal delay is computed for multilayer concrete floors with varying numbers of layers and layer thicknesses. The mass density and thermal conductivity of the various materials were determined experimentally. Given its heterogeneity, the specific heat of the lightweight screed was obtained indirectly using both the experimental results and the analytical model.The results obtained show the potential of these composites in applications for increasing the thermal performance of concrete floors, in particular the thermal delay and thermal resistance. The results show that the contribution of the insulating lightweight screed material's properties to thermal delay is more relevant in systems composed of few layers. The constructive solutions composed of a greater number of layers present higher thermal delay value.

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Section: Thermal Delay and Thermal Transmittance Coefficient Of The Fsupporting

confidence: 55%

Section: Analytical Solutionsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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