4.19 SGDIST

SGDIST creates a subobject of the current window that distributes a specified fraction of that window’s solar gain to a specified delayed model (massive) surface. Any remaining solar gain (all of the window’s solar gain if no SGDISTs are given) is added to the air of the zone containing the window. A window may have up to three SGDISTs; an error occurs if more than 100% of the window’s gain is distributed.

Via members sgFSO and sgFSC, the fraction of the insolation distributed to the surface can be made dependent on whether the zone’s shades are open or closed (see ZONE member znSC).

sgName

Name of solar gain distribution (follows “SGDIST” if given).

Units	Legal Range	Default	Required	Variability
	63 characters	none	No	constant

sgSurf=sfName

Name of surface to which gain is targeted.

If there is more than surface with the specified name: if one of the surfaces is in the current zone, it is used; otherwise, an error message is issued.

The specified surface must be modeled with the Delayed model. If gain is targeted to a Quick model surface, a warning message is issued and the gain is redirected to the air of the associated zone.

Units	Legal Range	Default	Required	Variability
	name of a SURFACE	none	Yes	constant

sgSide=choice

Designates the side of the surface to which the gain is to be targeted:

INTERIOR	Apply gain to interior of surface
EXTERIOR	Apply gain to exterior of surface

Units	Legal Range	Default	Required	Variability
	INTERIOR, EXTERIOR	Side of surface in zone containing window; or INTERIOR if both sides are in zone containing window.	Yes	constant

sgFSO=float

Fraction of solar gain directed to specified surface when the owning window’s interior shading is in the open position (when the window’s zone’s shade closure (znSC) is 0).

Units	Legal Range	Default	Required	Variability
	0 \(\le\) x \(\le\) 1,and sum of window’s sgFSO’s \(\le\) 1	none	Yes	monthly-hourly

sgFSC=float

Fraction of solar gain directed to specified surface when the owning window’s interior shading is in the closed position. If the zone’s shades are partly closed (znSC between 0 and 1), a proportional fraction between sgFSO and sgFSC is used.

Units	Legal Range	Default	Required	Variability
	0 \(\le\) x \(\le\) 1, and sum of window’s sgFSC’s \(\le\) 1	sgFSO	No	monthly-hourly

endSGDist

Optionally indicates the end of the solar gain distribution definition. Alternatively, the end of the solar gain distribution definition can be indicated by END or by just beginning another object.

Units	Legal Range	Default	Required	Variability
		none	No	constant

Related Probes:

• @sgdist