Ladybug Primer
Ladybug Tools for Grasshopper Documentation
  • Ladybug Primer
  • Components
    • 0 :: Import
      • Download Weather
      • EPWmap
      • Import EPW
      • Import Location
      • Construct Location
      • Deconstruct Location
      • Import DDY
      • Import STAT
      • Deconstruct Design Day
      • Import Design Day
      • EPW to DDY
    • 1 :: Analyze Data
      • Construct Data
      • Construct Data Type
      • Construct Header
      • Deconstruct Data
      • Analysis Period
      • Calculate HOY
      • Apply Analysis Period
      • Apply Conditional Statement
      • Arithmetic Operation
      • Time Interval Operation
      • Degree Days
      • Wind Speed
      • Adaptive Comfort
      • PET Comfort
      • PMV Comfort
      • UTCI Comfort
      • Indoor Solar MRT
      • Outdoor Solar MRT
      • Ankle Draft
      • Clothing by Temperature
      • Comfort Statistics
      • Convert to Timestep
      • Data DateTimes
      • Day Solar Information
      • Deconstruct Header
      • Directional Solar Irradiance
      • HOY to DateTime
      • Humidity Metrics
      • Mass Arithmetic Operation
      • Radiant Asymmetry
      • Relative Humidity from Dew Point
      • Solar MRT from Solar Components
      • Thermal Indices
    • 2 :: Visualize Data
      • Hourly Plot
      • Monthly Chart
      • Adaptive Chart
      • PMV Polygon
      • Psychrometric Chart
      • UTCI Polygon
      • Benefit Sky Matrix
      • Cumulative Sky Matrix
      • Sky Dome
      • SunPath
      • Radiation Dome
      • Radiation Rose
      • Wind Profile
      • Wind Rose
    • 3 :: Analyze Geometry
      • Direct Sun Hours
      • Incident Radiation
      • View Factors
      • View Percent
      • View Rose
      • Visibility Percent
      • Human to Sky Relation
      • Sky Mask
      • Solar Envelope
      • Surface Ray Tracing
      • Shade Benefit
      • Thermal Shade Benefit
      • Set Rhino Sun
      • View From Sun
      • Real Time Incident Radiation
    • 4 :: Extra
      • Color Range
      • FalseStartToggle
      • Generate Point Grid
      • ImageViewer
      • Legend Parameters
      • Mesh Threshold Selector
      • Preview VisualizationSet
      • Spatial Heatmap
      • Capture View
      • Legend 2D Parameters
      • Orient to Camera
      • Set View
      • To IP
      • To SI
      • To Unit
      • Unit Converter
      • Adaptive Comfort Parameters
      • PMV Comfort Parameters
      • Passive Strategies
      • Solar Body Parameters
      • Dump Data
      • Load Data
      • Open Directory
      • Open File
      • Compass
      • Magnetic to True North
      • Activities Met List
      • Area Aggregate
      • Area Normalize
      • Clothing List
      • Construct Matrix
      • Create Legend
      • Deconstruct Matrix
      • Deconstruct VisualizationSet
      • Dump VisualizationSet
      • Filter by Normal
      • Legend Parameters Categorized
      • Mesh to Hatch
      • PET Body Parameters
      • Passive Strategy Parameters
      • Screen Oriented Text
      • SortByLayers
      • Time Aggregate
      • Time Rate of Change
      • UTCI Comfort Parameters
    • 5 :: Version
      • Sync Grasshopper File
      • Versioner
      • Export UserObject
      • Legacy Updater
Powered by GitBook
On this page
  • Inputs
  • Outputs
Export as PDF
  1. Components
  2. 1 :: Analyze Data

Thermal Indices

PreviousSolar MRT from Solar ComponentsNext2 :: Visualize Data

Last updated 2 years ago

-

Calculate thermal indices that have historically been used by meteorologists. All of them are "feels like" temperatures that attempt to account for factors beyond sir temperature. These include the following:

  • Wet Bulb Globe Temperature (WBGT) * Heat Index (HI) * Wind Chill Temperature (WCT)

Most of these indices have fallen out of use in favor of Universal Thermal Climate Index (UTCI). However, they are still used in some regions and are a part of older codes and standards.

Inputs

  • air_temp [Required]

Data Collection or individual value for air temperature in C. This input is used by all three metrics.

  • mrt

Data Collection or individual value for mean radiant temperature (MRT) in C. Default is the same as the air_temp. This input only affects the WBGT.

  • rel_humid [Required]

Data Collection or individual value for relative humidity in %. Note that percent values are between 0 and 100. This input affects WBGT as well as HI.

  • wind_vel [Required]

Data Collection or individual value for meteoroligical wind velocity at 10 m above ground level in m/s. This is used by both WBGT and WCT.

Outputs

  • wbgt

A data collection or value for Wet Bulb Globe Temperature (WBGT) [C]. WBGT is a type of feels-like temperature that is widely used as a heat stress index (ISO 7243). It is incorporates the effect of temperature, humidity, wind speed, and mean radiant temperature (optionally including the effect of sun).

  • heat_index

A data collection or value for Heat Index (HI) temperature [C]. Heat index is derived from original work carried out by Robert G. Steadman, which defined heat index through large tables of empirical data. The formula here approximates the heat index to within +/- 0.7C and is the result of a multivariate fit. Heat index was adopted by the US's National Weather Service (NWS) in 1979.

  • wind_chill

A data collection or value for Wind Cill Temperature (WCT) [C]. Wind Chill Index is derived from original work carried out by Gregorczuk. It qualifies thermal sensations of a person in wintertime. It is especially useful at low and very low air temperature and at high wind speed.

[source code]