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Window Downdraft - [source code]

Use this component to compute the floor-level downdraft air temperature and velocity at a given set of points that are located close to a cold surface such as a window. The draft conditions produced by this model are assumed to be 10 cm off of the floor. _ The model used in this component comes from physical measurements of window downdraft that were further validated using several CFD experiments. Ther are published in these papers: _ Heiselberg, P. (1994). “Draft Risk from Cold Vertical Surfaces.” Building and Environment, 29: 297-301. Manz, H. and Frank, T. (2003). "Analysis of Thermal Comfort near Cold Vertical Surfaces by Means of Computational Fluid Dynamics." Indoor Built Environment. 13: 233-242.

Inputs

  • testPts [Required]

The test points at which downdraft conditions will be evaluated.

  • windowSrfs [Required]

Breps or Surfaces representing the window surfaces off of which downdraft flows.

  • winSrfTemp [Required]

A number representing the surface temperature of the windows in degrees Celcius.

  • airTemp [Required]

A number representing the air temperature of the room in degrees Celcius.

  • defaultVeloc [Optional]

A number in m/s that represents the speed of the air that is not in the downdraft. The default is set to 0.05 m/s.

  • runIt [Required]

Set to 'True' to run the component and claculate downdraft conditions.

Outputs

  • draftAirTemp

Script output PPD.

  • draftAirVeloc

Script variable downDraft

  • airFlowPlanes

Script variable downDraft

[Check Hydra Example Files for Window Downdraft](https://hydrashare.github.io/hydra/index.html?keywords=Ladybug_Window Downdraft)