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4.3.47. 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:

convection_coefficient_wall_internal

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

Unit:

W m^-2 K^-1

Example:

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.

convection_coefficient_roof_internal

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

Unit:

W m^-2 K^-1

Example:

10.0

convection_coefficient_internal_mass

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

Unit:

W m^-2 K^-1

Example:

7.69

convection_coefficient_ground_floor_internal

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

Unit:

W m^-2 K^-1

Example:

5.88

convection_coefficient_window_internal

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

Unit:

W m^-2 K^-1

Example:

7.69

convection_coefficient_wall_external

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

Unit:

W m^-2 K^-1

Example:

25.0

convection_coefficient_roof_external

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

Unit:

W m^-2 K^-1

Example:

25.0

convection_coefficient_window_external

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

Unit:

W m^-2 K^-1

Example:

25.0

depth_ground

Depth of external ground (deep soil) [m]

Unit:

m

Example:

3.0

thermal_conductivity_ground

External ground thermal conductivity

Unit:

W m^-1 K^-1

Example:

0.193

threshold_metabolism

threshold of metabolic rate to determine occupancy active or inactive [W]

Unit:

W

Example:

74.3

ratio_latent_sensible

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

Unit:

dimensionless

Example:

0.0

daylight_control

Integer flag to enable daylight-based lighting control (0 = off, 1 = on)

Unit:

dimensionless

Example:

0

threshold_lighting_illuminance

Indoor illuminance threshold above which electric lighting is switched off [lx]

Unit:

lx

Example:

300.0

efficiency_heating_system_air

Efficiency of space heating system [-]

Unit:

dimensionless

Example:

0.9

max_power_cooling_system_air

Maximum power demand of cooling system [W]

Unit:

W

Example:

0.0

efficiency_cooling_system_air

Coefficient of performance of cooling system [-]

Unit:

dimensionless

Example:

3.4

rate_ventilation

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

Unit:

h^-1

Example:

0.0

temperature_air_outdoor_initial

Initial outdoor temperature [degC]

Unit:

degC

Example:

0.0

temperature_air_indoor_initial

Initial indoor temperature [degC]

Unit:

degC

Example:

0.0

temperature_air_annual_mean

Annual mean air temperature [degC]

Unit:

degC

Example:

10.0

temperature_air_month_mean_diffmax

Maximum difference in monthly outdoor air temperature [degC]

Unit:

degC

Example:

10.0

thickness_hot_water_tank_wall

Hot water tank wall thickness [m]

Unit:

m

Example:

0.01

temperature_mains_water

Temperature of water coming into the water tank [degC]

Unit:

degC

Example:

0.0

surface_area_hot_water_tank

Surface area of hot water tank cylinder [m2]

Unit:

m²

Example:

2.0

setpoint_temperature_heating_water

Water tank setpoint temperature [degC]

Unit:

degC

Example:

60.0

emissivity_hot_water_tank_wall

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

Unit:

dimensionless

Example:

0.0

thickness_hot_water_vessel_wall

Hot water vessel wall thickness [m]

Unit:

m

Example:

0.005

volume_hot_water

Volume of water held in use in building [m3]

Unit:

m³

Example:

0.05

Default Description:

Missing default explanation.

Range Description:

Missing range explanation.

surface_area_hot_water

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

Unit:

m²

Example:

0.5

rate_flow_hot_water

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

Unit:

m³ s^-1

Example:

0.0

profile_flow_hot_water

Profile of hot water flow rate from tank to vessel [m3 s-1]

Unit:

m³ s^-1

The profile_flow_hot_water parameter group is defined by the Ten Minute Profile structure.

specific_heat_capacity_hot_water

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

Unit:

J kg^-1 K^-1

Example:

4186.0

specific_heat_capacity_hot_water_tank_wall

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

Unit:

J kg^-1 K^-1

Example:

500.0

specific_heat_capacity_hot_water_vessel_wall

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

Unit:

J kg^-1 K^-1

Example:

500.0

density_hot_water

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

Unit:

kg m^-3

Example:

1000.0

density_hot_water_tank_wall

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

Unit:

kg m^-3

Example:

2500.0

density_hot_water_vessel_wall

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

Unit:

kg m^-3

Example:

2500.0

conductivity_hot_water_tank_wall

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

Unit:

W m^-1 K^-1

Example:

0.5

convection_coefficient_hot_water_tank_wall_internal

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

Unit:

W m^-2 K^-1

Example:

7.7

convection_coefficient_hot_water_tank_wall_external

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

Unit:

W m^-2 K^-1

Example:

7.7

conductivity_hot_water_vessel_wall

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

Unit:

W m^-1 K^-1

Example:

0.5

convection_coefficient_hot_water_tank_vessel_internal

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

Example:

7.7

convection_coefficient_hot_water_tank_vessel_external

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

Example:

7.7

emissivity_hot_water_vessel_wall

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

Unit:

dimensionless

Example:

0.9

efficiency_heating_system_water

Efficiency of hot water system [-]

Unit:

dimensionless

Example:

0.9

profile_appliance

10-minute profile of appliance usage factor in building [-]

Unit:

dimensionless

The profile_appliance parameter group is defined by the Ten Minute Profile structure.

power_density_lighting

Lighting power per building floor area [W m-2]

Unit:

W m^-2

Example:

2

ref

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