| /*---------------------------------------------------------------------------*\ | |
| ========= | | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox | |
| \\ / O peration | Website: https://openfoam.org | |
| \\ / A nd | Copyright (C) 2019-2023 OpenFOAM Foundation | |
| \\/ M anipulation | | |
| ------------------------------------------------------------------------------- | |
| License | |
| This file is part of OpenFOAM. | |
| OpenFOAM is free software: you can redistribute it and/or modify it | |
| under the terms of the GNU General Public License as published by | |
| the Free Software Foundation, either version 3 of the License, or | |
| (at your option) any later version. | |
| OpenFOAM is distributed in the hope that it will be useful, but WITHOUT | |
| ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| for more details. | |
| You should have received a copy of the GNU General Public License | |
| along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>. | |
| Class | |
| Foam::functionObjects::comfort | |
| Description | |
| Calculates the thermal comfort quantities predicted mean vote (PMV), | |
| predicted percentage of dissatisfaction (PPD) and the draught rate (DR) | |
| based on DIN ISO EN 7730:2005. | |
| The draught rate is defined for velocities between 0 m/s and 0.5 m/s. Values | |
| larger than 0.5 m/s will be set to 0.5 m/s. Furthermore, the draught rate is | |
| defined between 20 degC and 26 degC. A temperature limitation is not | |
| implemented. The draught rate is mainly used for HVAC analysis in rooms. | |
| Usage | |
| \table | |
| Property | Description | Required | Default value | |
| clothing | The insulation value of the cloth | no | 0 | |
| metabolicRate | The metabolic rate | no | 0.8 | |
| extWork | The external work | no | 0 | |
| Trad | Radiation temperature | no | 0 | |
| relHumidity | Relative humidity of the air | no | 0.5 | |
| pSat | Saturation pressure of water | no | -1 | |
| tolerance | Residual control for the cloth temperature | no | 1e-4 | |
| maxClothIter | Maximum number of iterations | no | 100 | |
| meanVelocity | Use a constant mean velocity in the whole domain | no |\ | |
| false | |
| \endtable | |
| \table | |
| Predicted Mean Vote (PMV) | evaluation | |
| + 3 | hot | |
| + 2 | warm | |
| + 1 | slightly warm | |
| + 0 | neutral | |
| - 1 | slightly cool | |
| - 2 | cool | |
| - 3 | cold | |
| \endtable | |
| \verbatim | |
| comfortAnalysis | |
| { | |
| type comfort; | |
| libs ("libfieldFunctionObjects.so"); | |
| executeControl writeTime; | |
| writeControl writeTime; | |
| } | |
| \endverbatim | |
| SourceFiles | |
| comfort.C | |
| \*---------------------------------------------------------------------------*/ | |
| // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // | |
| namespace Foam | |
| { | |
| namespace functionObjects | |
| { | |
| /*---------------------------------------------------------------------------*\ | |
| Class comfort Declaration | |
| \*---------------------------------------------------------------------------*/ | |
| class comfort | |
| : | |
| public fvMeshFunctionObject | |
| { | |
| // Private Data | |
| //- Clothing [-] | |
| dimensionedScalar clothing_; | |
| //- Metabolic rate [kg/s^3] | |
| dimensionedScalar metabolicRate_; | |
| //- External work [kg/s^3] | |
| dimensionedScalar extWork_; | |
| //- Switch set to true if the radiation temperature is provided | |
| Switch TradSet_; | |
| //- Mean radiation temperature [K] | |
| dimensionedScalar Trad_; | |
| //- Relative humidity [percentage] | |
| dimensionedScalar relHumidity_; | |
| //- Saturation pressure of water [Pa] | |
| dimensionedScalar pSat_; | |
| //- Thermal insulation of clothing [W/m^2/K] | |
| dimensionedScalar Icl_; | |
| //- Prefactor of cloth area [-] | |
| dimensionedScalar fcl_; | |
| //- Tolerance criteria for iterative process to find Tcl | |
| scalar tolerance_; | |
| //- Maximum number of correctors for cloth temperature | |
| int maxClothIter_; | |
| //- Switch to use volume weighted velocity field for calculation | |
| Switch meanVelocity_; | |
| // Private Member Functions | |
| // Calculate the magnitude of the velocity [m/s] | |
| tmp<volScalarField> magU() const; | |
| // Calculate the radiation temperature in the domain using a simple | |
| // approach [K] | |
| dimensionedScalar Trad() const; | |
| // Calculate the saturation pressure based on 7730:2006 | |
| // Possible options: adding different calculation methods such as | |
| // the formulation based on Magnus or others [Pa] | |
| tmp<volScalarField> pSat() const; | |
| // Calculate and return the surface temperature of the cloth [K] | |
| // and the heat transfer coefficient hc [W/m^2/K] | |
| tmp<volScalarField> Tcloth | |
| ( | |
| volScalarField& hc, | |
| const dimensionedScalar& metabolicRateSI, | |
| const dimensionedScalar& extWorkSI, | |
| const volScalarField& TdegC, | |
| const dimensionedScalar& Trad | |
| ); | |
| // Return true if the cloth temperature iteration has converged | |
| bool converged(const volScalarField&) const; | |
| public: | |
| //- Runtime type information | |
| TypeName("comfort"); | |
| // Constructors | |
| //- Construct from Time and dictionary | |
| comfort | |
| ( | |
| const word& name, | |
| const Time& runTime, | |
| const dictionary& dict | |
| ); | |
| //- Destructor | |
| virtual ~comfort(); | |
| // Member Functions | |
| //- Read the data needed for the comfort calculation | |
| virtual bool read(const dictionary&); | |
| //- Return the list of fields required | |
| virtual wordList fields() const; | |
| //- Calculate the predicted mean vote (PMV) | |
| // and predicted percentage dissatisfaction (PPD) fields | |
| virtual bool execute(); | |
| //- Write the PPD and PMV fields | |
| virtual bool write(); | |
| }; | |
| // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // | |
| } // End namespace functionObjects | |
| } // End namespace Foam | |
| // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // | |
| // ************************************************************************* // | |