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0 \| Ladybug


1 \| AnalyzeWeatherData


2 \| VisualizeWeatherData


3 \| EnvironmentalAnalysis


4 \| Renewables

5 | Extra

6 | Developers


7 \| WIP

Steady State Surface Temperature

Use this component to calculate a steady state interior/exterior surface temperature from given given indoor/outdoor air temperatures and surface U-Values. Note that this component does not currently account for solar radiation, which can greatly alter surface temperatures in the real world.
The formulas used to account for air film resistance in this component come from ASHRAE Fundementals 2013, Chapter 26, Table 10 (26.20).

Inputs

Name	ID	Description	Type
Out Temp	_outTemp	A number (or list of numbers) that represent the outdoor air temperature in degrees Celcius.	Goo
In Temp	_inTemp	A number (or list of numbers) that represent the indoor air temperature in degrees Celcius.	Goo
U Value	_uValue	A number that represents the U-Value of the surface dividing the interior and exterior in SI (W/K·m2).	Goo
Int Emiss	intEmiss_	A number between 0 and 1 that represents the interior emissivity of the surface dividing the interior and exterior. The default is set to 0.9 for a non-metallic surface.	Goo
Srf Orient	srfOrient_	A number between 180 (downwards) and 0 (upwards) that represents the angle in degrees of the direction of heat flow. This is related to the orientation of the surface dividing the interior and exterior. This input can also be the normal vector of a surface that is facing the correct direction of heat flow. The default is set to 90 degrees for a verically-oriented surface (horizontal heat flow).	Goo
Out Wind Spd	outWindSpd_	A number (or list of numbers) that represents the outdoor wind speed in m/s. This is used to calculate the outdoor film coefficient. If no value is input here, a default of 6.7 m/s will be assumed (indicating a winter design day).	Goo

Outputs

Name	ID	Description	Type
In Film Coeff	inFilmCoeff	The interior film coefficient as calculated by the interior emissivity, surface orientation and Chapter 26, Table 10 of AHSHRAE Fundemantals.	Goo
Ext Film Coeff	extFilmCoeff	Script variable ssSrfTemp	Goo
In Srf Temp	inSrfTemp	The steady state interior surface temperature in degrees Celcius.	Goo
Ext Srf Temp	extSrfTemp	The steady state exterior surface temperature in degrees Celcius.	Goo

Video Tutorials

Ladybug Radiation Optimization