Influence of concrete fracture on the rain infiltration and thermal performance of building facades

Rouchier, Simon; Woloszyn, Monika; Foray, Geneviève; Roux, Jean-Jacques

doi:10.1016/j.ijheatmasstransfer.2013.02.013

Cited by 22 publications

(17 citation statements)

References 33 publications

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“…The physical model for the simulation is the system of partial differential equations for coupled heat and moisture transfer, written here with the temperature T and the vapour pressure p v as driving potentials. These conservation equations follow the notations and hypotheses usually made in building physics applications [11,17,30]. For the sake of simplification, liquid transfer is not considered.…”

Section: Theory and Problem Formulation 21 Forward And Inverse Problemsmentioning

confidence: 99%

Identification of the hygrothermal properties of a building envelope material by the covariance matrix adaptation evolution strategy

Rouchier

Woloszyn

Kedowide

et al. 2015

Journal of Building Performance Simulation

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This paper proposes the application of the Covariance Matrix Adaptation (CMA) evolution strategy for the identification of building envelope materials hygrothermal properties. All material properties are estimated on the basis of local temperature and relative humidity measurements, by solving the inverse heat and moisture transfer problem. The applicability of the identification procedure is demonstrated in two stages: first, a numerical benchmark is developed and used as to show the potential identification accuracy, justify the choice for a Tikhonov regularisation term in the fitness evaluation, and propose a method for its appropriate tuning. Then, the procedure is applied on the basis of experimental measurements from an instrumented test cell, and compared to the experimental characterisation of the observed material. Results show that an accurate estimation of all hygrothermal properties of a building material is feasible, if the objective function of the inverse problem is carefully defined.

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Section: Theory and Problem Formulation 21 Forward And Inverse Problemsmentioning

confidence: 99%

Identification of the hygrothermal properties of a building envelope material by the covariance matrix adaptation evolution strategy

Rouchier

Woloszyn

Kedowide

et al. 2015

Journal of Building Performance Simulation

Self Cite

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“…The liquid flow from the rain can vary according to the wind speed [5]. In the literature [17,19,22,39], it is possible to find values within the range [ 2 · 10 −5 , 8 · 10 −4 ] kg/(m 2 · s) . Simulations were performed using the bvp4c, with relative and absolute tolerances of the solver set to 10 −5 .…”

Section: Applicationmentioning

confidence: 99%

An adaptive simulation of nonlinear heat and moisture transfer as a boundary value problem

Gasparin

Berger

Dutykh

et al. 2018

International Journal of Thermal Sciences

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An adaptive simulation of nonlinear heat and moisture transfer as a boundary value problem arXiv.org / hal Abstract. This work presents an alternative view on the numerical simulation of diffusion processes applied to the heat and moisture transfer through porous building materials. Traditionally, by using the finite-difference approach, the discretization follows the Method Of Lines (MOL), when the problem is first discretized in space to obtain a large system of coupled Ordinary Differential Equations (ODEs). Thus, this paper proposes to change this viewpoint. First, we discretize in time to obtain a small system of coupled ODEs, which means instead of having a Cauchy (Initial Value) Problem (IVP), we have a Boundary Value Problem (BVP). Fortunately, BVPs can be solved efficiently today using adaptive collocation methods of high order. To demonstrate the benefits of this new approach, three case studies are presented, in which one of them is compared with experimental data. The first one considers nonlinear heat and moisture transfer through one material layer while the second one considers two material layers. Results show how the nonlinearities and the interface between materials are easily treated, by reasonably using a fourth-order adaptive method. Finally, the last case study compares numerical results with experimental measurements, showing a good agreement.Key words and phrases: coupled heat and moisture diffusive transfer; boundary value problems; semi-discretization in time; semi-discretization in space; bvp4c MSC: [2010] 35R30 (primary), 35K05, 80A20, 65M32 (secondary)

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“…Neglecting the variation of the capillary pressure and the mass content with temperature [23], the partial derivative of P c can be written as:…”

Section: B)mentioning

confidence: 99%

“…The Euler and Crank-Nicolson implicit schemes have been used in many studies and implemented in building simulation tools, as reported in the literature [2,9,13,14,16,18,23,24,27], due to their numerical property of unconditional stability. Nevertheless, at every time step, one has to use a tridiagonal solver to invert the linear system of equations to determine the solution value at the following time layer.…”

Section: Introductionmentioning

confidence: 99%

An improved explicit scheme for whole-building hygrothermal simulation

et al. 2017

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Abstract. Implicit schemes require important sub-iterations when dealing with highly nonlinear problems such as the combined heat and moisture transfer through porous building elements. The computational cost rises significantly when the whole-building is simulated, especially when there is important coupling among the building elements themselves with neighbouring zones and with HVAC (Heating Ventilation and Air Conditioning) systems. On the other hand, the classical Euler explicit scheme is generally not used because its stability condition imposes very fine time discretisation. Hence, this paper explores the use of an improved explicit approach -the Dufort-Frankel scheme -to overcome the disadvantage of the classical explicit one and to bring benefits that cannot be obtained by implicit methods. The Dufort-Frankel approach is first compared to the classical Euler implicit and explicit schemes to compute the solution of nonlinear heat and moisture transfer through porous materials. Then, the analysis of the Dufort-Frankel unconditionally stable explicit scheme is extended to the coupled heat and moisture balances on the scale of a one-and a two-zone building models. The Dufort-Frankel scheme has the benefits of being unconditionally stable, second-order accurate in time O (∆t 2 ) and to compute explicitly the solution at each time step, avoiding costly sub-iterations. This approach may reduce the computational cost by twenty, as well as it may enable perfect synchronism for whole-building simulation and co-simulation.

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Influence of concrete fracture on the rain infiltration and thermal performance of building facades

Cited by 22 publications

References 33 publications

Identification of the hygrothermal properties of a building envelope material by the covariance matrix adaptation evolution strategy

Identification of the hygrothermal properties of a building envelope material by the covariance matrix adaptation evolution strategy

An adaptive simulation of nonlinear heat and moisture transfer as a boundary value problem

An improved explicit scheme for whole-building hygrothermal simulation

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