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4.3.42. STEBBS

STEBBS (Surface Temperature Energy Balance for Building Surfaces) model parameters.

Controls the building energy balance calculations including internal heating/cooling, building materials properties, and thermal behaviour.

Parameters:

WallInternalConvectionCoefficient

Internal convection coefficient of walls [W m-2 K-1]

Unit:

W m^-2 K^-1

Default:

7.69

Default Description:

Default value calculated from the CIBSE GUIDE A, Table 3.47, Page 176

Range Description:

Value must be greater than zero.

RoofInternalConvectionCoefficient

Internal convection coefficient of roof [W m-2 K-1]

Unit:

W m^-2 K^-1

Default:

10.0

InternalMassConvectionCoefficient

Convection coefficient of internal mass [W m-2 K-1]

Unit:

W m^-2 K^-1

Default:

7.69

FloorInternalConvectionCoefficient

Internal convection coefficient of ground floor [W m-2 K-1]

Unit:

W m^-2 K^-1

Default:

5.88

WindowInternalConvectionCoefficient

Internal convection coefficient of windows [W m-2 K-1]

Unit:

W m^-2 K^-1

Default:

7.69

WallExternalConvectionCoefficient

Initial external convection coefficient of walls and roof [W m-2 K-1]

Unit:

W m^-2 K^-1

Default:

25.0

RoofExternalConvectionCoefficient

Initial external convection coefficient of roof [W m-2 K-1]

Unit:

W m^-2 K^-1

Default:

25.0

WindowExternalConvectionCoefficient

Initial external convection coefficient of windows [W m-2 K-1]

Unit:

W m^-2 K^-1

Default:

25.0

GroundDepth

Depth of external ground (deep soil) [m]

Unit:

m

Default:

0.0

ExternalGroundConductivity

External ground thermal conductivity

Unit:

W m^-1 K^-1

Default:

0.0

IndoorAirDensity

Density of indoor air [kg m-3]

Unit:

kg m^-3

Default:

1.2

IndoorAirCp

Specific heat capacity of indoor air [J kg-1 K-1]

Unit:

J kg^-1 K^-1

Default:

1005.0

WallBuildingViewFactor

Building view factor of external walls [-]

Unit:

dimensionless

Default:

0.0

WallGroundViewFactor

Ground view factor of external walls [-]

Unit:

dimensionless

Default:

0.0

WallSkyViewFactor

Sky view factor of external walls [-]

Unit:

dimensionless

Default:

0.0

MetabolicRate

Metabolic rate of building occupants [W]

Unit:

W

Default:

0.0

LatentSensibleRatio

Latent-to-sensible ratio of metabolic energy release of occupants [-]

Unit:

dimensionless

Default:

0.0

ApplianceRating

Power demand of single appliance [W]

Unit:

W

Default:

0.0

TotalNumberofAppliances

Number of appliances present in building [-]

Unit:

dimensionless

Default:

0.0

ApplianceUsageFactor

Number of appliances in use [-]

Unit:

dimensionless

Default:

0.0

HeatingSystemEfficiency

Efficiency of space heating system [-]

Unit:

dimensionless

Default:

0.0

MaxCoolingPower

Maximum power demand of cooling system [W]

Unit:

W

Default:

0.0

CoolingSystemCOP

Coefficient of performance of cooling system [-]

Unit:

dimensionless

Default:

0.0

VentilationRate

Ventilation rate (air changes per hour, ACH) [h-1]

Unit:

h^-1

Default:

0.0

OutdoorAirAnnualTemperature

Annual mean air temperature, which can be used as deep soil temperature

Unit:

degC

Default:

10.0

OutdoorAirStartTemperature

Initial outdoor air temperature [degC]

Unit:

degC

Default:

0.0

IndoorAirStartTemperature

Initial indoor air temperature [degC]

Unit:

degC

Default:

0.0

IndoorMassStartTemperature

Initial indoor mass temperature [degC]

Unit:

degC

Default:

0.0

WallIndoorSurfaceTemperature

Initial wall indoor surface temperature [degC]

Unit:

degC

Default:

0.0

WallOutdoorSurfaceTemperature

Initial wall outdoor surface temperature [degC]

Unit:

degC

Default:

0.0

RoofIndoorSurfaceTemperature

Initial roof indoor surface temperature [degC]

Unit:

degC

Default:

0.0

RoofOutdoorSurfaceTemperature

Initial roof outdoor surface temperature [degC]

Unit:

degC

Default:

0.0

WindowIndoorSurfaceTemperature

Initial window indoor surface temperature [degC]

Unit:

degC

Default:

0.0

WindowOutdoorSurfaceTemperature

Initial window outdoor surface temperature [degC]

Unit:

degC

Default:

0.0

GroundFloorIndoorSurfaceTemperature

Initial ground floor indoor surface temperature [degC]

Unit:

degC

Default:

0.0

GroundFloorOutdoorSurfaceTemperature

Initial ground floor outdoor surface temperature [degC]

Unit:

degC

Default:

0.0

WaterTankTemperature

Initial water temperature in hot water tank [degC]

Unit:

degC

Default:

50.0

InternalWallWaterTankTemperature

Initial hot water tank internal wall temperature [degC]

Unit:

degC

Default:

0.0

ExternalWallWaterTankTemperature

Initial hot water tank external wall temperature [degC]

Unit:

degC

Default:

0.0

WaterTankWallThickness

Hot water tank wall thickness [m]

Unit:

m

Default:

0.01

MainsWaterTemperature

Temperature of water coming into the water tank [degC]

Unit:

degC

Default:

0.0

WaterTankSurfaceArea

Surface area of hot water tank cylinder [m2]

Unit:

m²

Default:

0.0

HotWaterHeatingSetpointTemperature

Water tank setpoint temperature [degC]

Unit:

degC

Default:

60.0

HotWaterTankWallEmissivity

Effective external wall emissivity of the hot water tank [-]

Unit:

dimensionless

Default:

0.0

DomesticHotWaterTemperatureInUseInBuilding

Initial water temperature of water held in use in building [degC]

Unit:

degC

Default:

40.0

InternalWallDHWVesselTemperature

Initial hot water vessel internal wall temperature [degC]

Unit:

degC

Default:

0.0

ExternalWallDHWVesselTemperature

Initial hot water vessel external wall temperature [degC]

Unit:

degC

Default:

0.0

DHWVesselWallThickness

Hot water vessel wall thickness [m]

Unit:

m

Default:

0.005

DHWWaterVolume

Volume of water held in use in building [m3]

Unit:

m³

Default:

0.05

Default Description:

Missing default explanation.

Range Description:

Missing range explanation.

DHWSurfaceArea

Surface area of hot water in vessels in building [m2]

Unit:

m²

Default:

0.5

DHWVesselEmissivity

NEEDS CHECKED! NOT USED (assumed same as DHWVesselWallEmissivity) [-]

Unit:

dimensionless

Default:

0.0

HotWaterFlowRate

Hot water flow rate from tank to vessel [m3 s-1]

Unit:

m³ s^-1

Default:

0.0

DHWDrainFlowRate

Flow rate of hot water held in building to drain [m3 s-1]

Unit:

m³ s^-1

Default:

0.0

DHWSpecificHeatCapacity

Specific heat capacity of hot water [J kg-1 K-1]

Unit:

J kg^-1 K^-1

Default:

4186.0

HotWaterTankSpecificHeatCapacity

Specific heat capacity of hot water tank wal [J kg-1 K-1]

Unit:

J kg^-1 K^-1

Default:

500.0

DHWVesselSpecificHeatCapacity

Specific heat capacity of vessels containing hot water in use in buildings [J kg-1 K-1]

Unit:

J kg^-1 K^-1

Default:

500.0

DHWDensity

Density of hot water in use [kg m-3]

Unit:

kg m^-3

Default:

1000.0

HotWaterTankWallDensity

Density of hot water tank wall [kg m-3]

Unit:

kg m^-3

Default:

2500.0

DHWVesselDensity

Density of vessels containing hot water in use [kg m-3]

Unit:

kg m^-3

Default:

2500.0

HotWaterTankBuildingWallViewFactor

Water tank/vessel internal building wall/roof view factor [-]

Unit:

dimensionless

Default:

0.0

HotWaterTankInternalMassViewFactor

Water tank/vessel building internal mass view factor [-]

Unit:

dimensionless

Default:

0.0

HotWaterTankWallConductivity

Effective wall conductivity of the hot water tank [W m-1 K-1]

Unit:

W m^-1 K^-1

Default:

0.5

HotWaterTankInternalWallConvectionCoefficient

Effective internal wall convection coefficient of the hot water tank [W m-2 K-1]

Unit:

W m^-2 K^-1

Default:

0.0

HotWaterTankExternalWallConvectionCoefficient

Effective external wall convection coefficient of the hot water tank [W m-2 K-1]

Unit:

W m^-2 K^-1

Default:

0.0

DHWVesselWallConductivity

Effective wall conductivity of the hot water tank [W m-1 K-1]

Unit:

W m^-1 K^-1

Default:

0.5

DHWVesselInternalWallConvectionCoefficient

Effective internal wall convection coefficient of the vessels holding hot water in use in building [W m-2 K-1]

Unit:

W m^-2 K^-1

Default:

0.0

DHWVesselExternalWallConvectionCoefficient

Effective external wall convection coefficient of the vessels holding hot water in use in building [W m-2 K-1]

Unit:

W m^-2 K^-1

Default:

0.0

DHWVesselWallEmissivity

Effective external wall emissivity of hot water being used within building [-]

Unit:

dimensionless

Default:

0.9

HotWaterHeatingEfficiency

Efficiency of hot water system [-]

Unit:

dimensionless

Default:

0.0

MinimumVolumeOfDHWinUse

Minimum volume of hot water in use [m3]

Unit:

m³

Default:

0.0

ref

The ref parameter group is defined by the Reference Info structure.