modelFloorOnSlab
Information
Model of a slab-on-grade floor, the ground is modelled as purely conductive and considers solar fluxes transmitted through windows
Hypothesis and equations
Inner floor on a slab-on-grade floor model with a boundary condition on underside temperature (ground temperature). Modelling considers only the 1D conduction within the floor and the ground. On the upper side, convection and long wavelengths exchanges are modelled by a global surface exchange coefficient hs. The optional parameter RadInterne allows to take into account short wavelengths flows.
The parameter SurEquiValentTerre allows to take into account a ground layer whose thickness, mesh and type (clay/silt or sand/gravel) are defined in the Ground parameters section. In case this parameter is False the ground constituent material must be considered in the CaracParoi parameter.
Bibliography
none
Instructions for use
Complete the parameters regarding the type of models, inclusion of short wavelengths solar flux as well as a layer of a ground equivalent under the floor.
Complete the parameters of the slab / floor especially on the surface, the surface exchange coefficient and the characteristics of materials used. If SurEquivalentTerre = True is selected, fill in the Groud Parameters section information on the thickness of this layer and its discretization.
Complete the parameters for initialisation.
Known limits / Use precautions
none
Validations
Validated model - Gilles Plessis 06/2012
--------------------------------------------------------------
Licensed by EDF under a 3-clause BSD-license
Copyright © EDF 2009 - 2023
BuildSysPro version 3.6.0
Author : Gilles PLESSIS, EDF (2012)
--------------------------------------------------------------
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| SI.SurfaceCoefficientOfHeatTransfer | U_value | BuildSysPro.Building.BuildingEnvelope.Functions.U_Wall(wall_record = caracParoi, hs_int = hs_int, hs_ext = 1e6) | Wall U-value |
| Type of floor | |||
| Integer | ParoiActive | 1 | Type of floor |
| Integer | nP | 1 | Number of the layer whose upper boundary is the site of power injection - must be strictly lower than n |
| Type of model | |||
| Boolean | SurEquivalentTerre | true | Consideration of an earth layer between the floor and Tsol |
| Boolean | RadInterne | true | Consideration of radiative fluxes inside |
| Boolean | CLfixe | true | Time-invariant temperature of the ground |
| Floor parameters | |||
| BuildSysPro.Utilities.Records.GenericWall | caracParoi | Floor characteristics (including those of the ground under the floor if SurEquiValentTerre = False) | |
| SI.Area | S | 1 | Floor surface |
| SI.CoefficientOfHeatTransfer | hs_int | 5.88 | Coefficient of global surface exchange on the inner face |
| Ground parameters | |||
| BuildSysPro.Utilities.Records.GenericSolid | caracTerre | BuildSysPro.Utilities.Data.Solids.SoilClaySilt() | Physical characteristics of the ground |
| SI.Temperature | Ts | 293.15 | Ground temperature |
| SI.Length | eSol | 0.2 | Ground thickness |
| Integer | mSol | 5 | Number of meshes to model the ground |
| Water-based heating floor parameters | |||
| Integer | nD | 8 | Number of water floor discretization slices |
| SI.Distance | Ltube | 128 | Floor heating coil length |
| SI.Distance | DiametreInt | 0.013 | Inside diameter of the tube |
| SI.Distance | eT | 0.0015 | Tube thickness |
| SI.ThermalConductivity | lambdaT | 0.35 | Thermal conductivity of the tube |
| Initialisation parameters | |||
| SI.Temperature | Tp | 293.15 | Initial temperature of the floor |
| BuildSysPro.Utilities.Types.InitCond | InitType | BuildSysPro.Utilities.Types.InitCond.SteadyState | |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| BuildSysPro.BaseClasses.HeatTransfer.Interfaces.HeatPort_b | T_int | ||
| BuildSysPro.BaseClasses.HeatTransfer.Interfaces.HeatPort_b | Ts_int | ||
| Modelica.Blocks.Interfaces.RealInput | FluxAbsInt | LWR/SWR flows absorbed by this floor on its inner face | |
| BaseClasses.HeatTransfer.Interfaces.HeatPort_a | T_ground | Ground temperature | |
| Modelica.Blocks.Interfaces.RealInput[2] | WaterIn | Vector containing 1-the fluid temperature (K), 2-the flow (kg/s) | |
| Modelica.Blocks.Interfaces.RealOutput[2] | WaterOut | Vector containing 1-the fluid temperature (K), 2-the flow (kg/s) | |
| Modelica.Blocks.Interfaces.RealInput | PelecPRE | Electric power injected into the floor |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| BuildSysPro.BaseClasses.HeatTransfer.Sources.FixedTemperature | TemperatureSol | ||
| BuildSysPro.Systems.HVAC.Emission.RadiantFloor.RadiantHeatingFloor[nD] | PlancherActifEau | Floor surface divided into nD active floors with water circulation inside | |
| BuildSysPro.BaseClasses.HeatTransfer.Components.HomogeneousNLayersWall | plancherClassique | ||
| BuildSysPro.Systems.HVAC.Emission.RadiantFloor.RadiantHeatingFloor | PlancherChauffanteElec |
Revisions
Aurélie Kaemmerlen 02/2011 :
- Ajout du choix de considérer ou non les flux CLO sur la face interne via le booléen RadInterne
- Ajout d'une liste déroulante pour le choix des matériaux via l'annotation(choicesAllMatching=true)
Vincent Magnaudeix 03/2012 : Ajout d'un noeud de température pour une connection à une température de sol variable
Aurélie Kaemmerlen 05/2011 : Modification du nom du connecteur CLOabs changé en FluxAbsInt
Gilles Plessis 06/2012 :
- Fusion des anciens modèles pour considérer le sol ou non
- Insertion du record ParoiGenerique pour le paramètrage des caractéristiques de la paroi sous une forme "replaceable"
Aurélie Kaemmerlen 07/2012 : Modification similaires à celles effectuées sur la paroi classique
- Intégration de l'option permettant d'en faire un plancher chauffant à eau, Modification du paramètre par défaut pour hint (5.88 au lieu de 1)
- Intégration du modèle partiel de plancher chauffant électrique.
Amy Lindsay 03/2014 : changement des FluxSolInput en RealInput pour les flux absorbés intérieur pour éviter les confusions (ces flux absorbés en GLO ou en CLO peuvent non seulement provenir du soleil, mais aussi d'autres sources radiatives)
Benoît Charrier 12/2015 : ajout du paramètre caracTerre permettant de changer les caractéristiques physiques du sol
Mathias Bouquerel 07/2019 : the calculation of the wall U-value is added (takes into account the wall composition and heat transfer coefficients).