modelHotWaterRadiatorRegul
Information
Hypothesis and equations
Hot water radiator taking into account inertias of water filling and radiator body. Room heating needs have to be modelled apart from this model.
The radiator is controlled by an input of valve opening (between 0 and 1).
The radiator is discretized in horizontal slices with uniform temperature (water + metal). This discretization is detailed in document "Type 13 Radiateur" [EDF2000].
The model is based on dissipated power calculation from French standard with a power law [NF-047]. According to this standard, radiator parameters are standardized to a rated power for which the gap between mean radiator temperature and mean air temperature is 50°K.
Bibliography
Detailed modelling in note : H-E14-2011-01955-FR
[NF-047] NF / AERAULIQUE ET THERMIQUES - Radiateurs, convecteurs et panneaux rayonnants de plafonds - Annexe n°9
[EDF2000] Type 13, Radiateur, Document interne EDF sur la modélisation d'un radiateur à eau, corrigé par M. Raguin
Instructions for use
Setting of inertia is simplified thanks to a list of correlations by radiator type (cast iron, aluminium, steel) from manufactures data.
Known limits / Use precautions
For specific studies needing accuracy, it is possible to develop a pre-processor in order to determine the best value for the corrective coefficient CoeffCorrectif.
In further modelling, if the radiative dissipation become sensitive in comparison with conductive dissipation, it would be good to refine FracRad parameter in order to make it dependent on radiator temperature.
The mass flow conservation is not respected, it's recommended to use "RadiatorRoom" model.
Validations
Validated model - Hubert Blervaque, Sila Filfli 07/2011
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Licensed by EDF under a 3-clause BSD-license
Copyright © EDF 2009 - 2023
BuildSysPro version 3.6.0
Author : Hubert BLERVAQUE, Sila FILFLI, EDF (2011)
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Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Radiator technology | |||
| Integer | Type | 2 | Radiator type for determination of inertia (water filling and radiator body) by a correlation based on rated power |
| CERTITA given parameters for a DeltaTnom = 50°C | |||
| SI.EnergyFlowRate | Pnom | 1000 | Radiator rated power. Certita database gives manufacturers data certified standard NF (French standard) for a 50°C temperature gap |
| SI.TemperatureDifference | DeltaTnom | 50 | According to water temperature of distribution system, temperature gap between air and radiator (by default, in Certita conditions : 50°C) |
| Real | nNom | 1.29 | Slope of emission line |
| SI.MassFlowRate | DebitNom | 0.01 | Nominal water flow rate |
| Other parameters | |||
| Integer | N | 10 | Number of discretized elements |
| Real | CoeffCorrectif | 1.1 | For a low number of elements (<20), radiator rated power can be corrected with this parameter |
| Real | FracRad | 0.35 | Part of radiative emission in comparison with the convective part (between 0 and 1) |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| BuildSysPro.BaseClasses.HeatTransfer.Interfaces.HeatPort_b | Rad | Radiative part of dissipated heat to the room | |
| BuildSysPro.BaseClasses.HeatTransfer.Interfaces.HeatPort_b | Conv | Convective part of dissipated heat to the room | |
| Modelica.Blocks.Interfaces.RealInput | Regulation | Valve opening control (between 0 and 1) | |
| Modelica.Blocks.Interfaces.RealInput[2] | WaterIn | Vector containing 1- the input fluid temperature (K), 2- the input fluid flow rate (kg/s) | |
| Modelica.Blocks.Interfaces.RealOutput[2] | WaterOut | Vector containing 1- the output fluid temperature (K), 2- the output fluid flow rate (kg/s) |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| SI.MassFlowRate | Debit | Water flow rate in radiator | |
| SI.Temperature | Ta | Temperature of the room | |
| SI.EnergyFlowRate | Ptot | Puissance dissipée par le radiateur à la pièce |
Revisions
Hubert Blervaque 06/2012 : MAJ de la documentation BuildSysPro.
Sila Filfli 04/2013 : Ajout d'une vanne thermostatique simple. Le débit varie en fonction du besoin et ne peut dépasser la valeur nominale. Le besoin est représenté par l'ouverture de la vanne avec une régulation entre 0 - fermée et 1 - ouverte (il s'agit du ratio de la puissance demandée par rapport à la puissance nominale).
Hubert Blervaque 09/2013 : Ajout d'une corrélation par type de radiateur (fonte, aluminium, acier) issue de données constructeur pour faciliter le paramétrage de l'inertie.
Frédéric Gastiger 03/2015 : Correction d'une erreur sur la valeur de la masse volumique de l'eau (1E-3 au lieu de 1E3).
Benoît Charrier 05/2015 : Suppression des connecteurs T & m_flow.