modelLogStove

Diagram of LogStove

Information

Log stove (by default 3,6 kg)

Hypothesis and equations

The model connects directly to the air node of the heated room.

Bibliography

detailled model is the note :H-E14-2011-01955-FR

Instructions for use

none

Known limits / Use precautions

none

Validations

Validated model - EIFER 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 : EDF (2011)
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Parameters

TypeNameDefaultDescription
SI.MassmL03.6Initial mass of wet wood log
SI.MassmB0(1 - H/100)*mL0Initial mass of dry wood log
RealH15.0Wood humidity in %
Realx1Stoichiometric value of carbone
Realy1.44Stoichiometric value of hydrogen
Realz0.66Stoichiometric value of oxygen
SI.SpecificEnergyHpy125900Specific Energy of pyrolysis
SI.SpecificEnergyHevap2260000Latent Heat of Vaporization
SI.SpecificEnergyPCS20000000Higher Heating Value - HHV
SI.SpecificEnergyPCIPCS*(1 - H/100) - 2512*(9*0.05*(1 - H/100) + H/100)Lower Heating Value - LHV
SI.MassmP113Stove's mass
SI.MassmGV_P*1.4Gas mass in combustion chamber
SI.AreaS_L0.03Wood surface
SI.AreaS_P1.07Inside stove surface
SI.AreaS_PExt3.5External stove surface
SI.AreaS_Vitre0.1421Window surface
SI.AreaS_G0.12219Gas surface
SI.VolumeV_P0.08Volume of combustion chamber
Realcontactratio20ratio of the stove's surface used in radiative heat transfer with smokes
RealA51300000000
SI.EnergyEa88000Activation energy for vaporization
SI.EmissivityeL0.9Emissivity of the wood
SI.EmissivityeG1Emissivity of the gas
SI.EmissivityeP0.3Emissivity of the stove (intern)
SI.CoefficientOfHeatTransferhccL15.432Heat transfer coefficient of the wood
SI.CoefficientOfHeatTransferhccP30.864Heat transfer coefficient of the combustion chamber
SI.CoefficientOfHeatTransferhccPExt6.173Heat transfer coefficient of the stove
Realdmi2.77/3600Initial mass loss
SI.TimeTaux0.4*3600Response time
RealTauxEtoileCR1.6Mass loss characteristic time
Reala0.79573283Coefficient a
Realb0.18557385Coefficient b
SI.Timet_sech688Drying time
SI.MassmPhase30.001When this mass is reached, the fire is over: it's the 3rd phase

Connectors

TypeNameDefaultDescription
Modelica.Blocks.Interfaces.RealInputAllureAir rate (0,1 = reduced rate ; 0,3 = normal rate)
Modelica.Blocks.Interfaces.RealOutputT_FenKWindow temperature
BuildSysPro.BaseClasses.HeatTransfer.Interfaces.HeatPort_bConvectionHeat transmitted by convection to the room
BuildSysPro.BaseClasses.HeatTransfer.Interfaces.HeatPort_bRadiationHeat transmitted by radiation to the room
Modelica.Blocks.Interfaces.RealInputt_startTime when the stove starts a new phase
Modelica.Blocks.Interfaces.RealOutputm_bMass of wood
Modelica.Blocks.Interfaces.RealInputTpieceRoom temperature in K

Components

TypeNameDefaultDescription
SI.MassmLMass of wood (wet)
SI.MassmEMass of water in the wood
SI.MassmBMass of dry wood
SI.MassmFMass of smoke
SI.SpecificHeatCapacityCpLSpecific Heat Capacity of wet wood
SI.SpecificHeatCapacityCpGSpecific Heat Capacity of gas
SI.SpecificHeatCapacityCpPSpecific Heat Capacity of the stove
RealM_O216Molar mass of 02
RealM_N214Molar mass of N2
RealM_O8Molar mass of 0
RealM_C6Molar mass of C
RealM_H1Molar mass of H
SI.TemperatureT_LWood temperature
SI.TemperatureT_GGas temperature
SI.TemperatureT_PStove's side temperature
Modelica.Units.NonSI.Temperature_degCT_FenCWindow temperature in Celsius degrees
SI.EnergyFlowRateQpypyrolysis energy flow rate
SI.EnergyFlowRateQevapvaporization energy flow rate
SI.EnergyFlowRateQcombcombustion Energy flow rate
SI.EnergyFlowRateQccLGconvective heat transfer between the wood and the gas
SI.EnergyFlowRateQccPExtconvective heat transfer between the stove and the room
SI.EnergyFlowRateQccGPconvective heat transfer between the gas and the stove
SI.EnergyFlowRateQrLGradiative heat transfer between the wood and the gas
SI.EnergyFlowRateQrLPradiative heat transfer between the wood and the stove
SI.EnergyFlowRateQrGPradiative heat transfer between the gas and the stove
SI.EnergyFlowRateQrGLradiative heat transfer between the gas and the wood
SI.EnergyFlowRateQrPLradiative heat transfer between the stove and the wood
SI.EnergyFlowRateQrPGradiative heat transfer between the stove and the gas
SI.EnergyFlowRateQrVitreradiative heat transfer through the stove's window
SI.EnergyFlowRateQrPExtradiative heat transfer between the wood and the room
SI.SpecificHeatCapacityCpFSpecific Heat Capacity of the smoke
SI.EnergyFlowRateQ_FHeat lost within the smoke
SI.CoefficientOfHeatTransferhrradiative heat transfer coefficient
RealXcombustion coefficient X
RealA1View factor
RealA2View factor
RealB1View factor
RealB2View factor
RealC1View factor
RealC2View factor
RealtEtoile
RealtChargeMoment when wood is inserted into the stove
RealtCharge2Used to make a difference between the start of mE and mB loss if a start phase is required
SI.EnergyFlowRateQ_demarrageeP*Modelica.Constants.sigma*S_P*(T_P^4 - C1*Tpiece^4) + eG*Modelica.Constants.sigma*S_G*(T_G^4 - B2*Tpiece^4) + hccL*S_L*((T_G) - Tpiece)actual power in the chamber of combustion
SI.EnergyFlowRateQ_fournie300estimated power required to start the combustion without warming phase
SI.EnergyFlowRateQ_starting1000
Integerdemarragetrue only during the start phase

Revisions

Hubert Blervaque - Juin 2012

Prise en compte du message suivant : /// Rque Aurélie Kaemmerlen, 10/2011 : ATTENTION, les initialisations sur T_L, T_G et T_P(start=Tpiece) sont invalides car Tpiece n'est pas un paramètre mais une variable. Cette initialisation n'est donc pas utilisée par Dymola