DOE-2 Reference Manual Version 2.1 - DOE2.com

. Locating and Orienting Building Shades, Roofs, and Exterior WallsThe method for locating and orienting building shades and exteriorwalls is similar to the SPACE locating method, although buildingshades are specified relative to the building coordinate system androofs and exterior walls are specified relative to the spacecoordinate system. In both cases, X, Y, Z, AZIMUTH, and TILT must beinput. TILT is simply the angle between the vertical (the buildingz-axis or the SPACE z-axis) and the surface outward normal. Verticalsurfaces have TILT = 90; surfaces with the surface outward normalpointing straight up (horizontal) have TILT = 0 (see Fig. III.7).For vertical surfaces, AZIMUTH is the clockwise angle between they-axis (SPACE y-axis for exterior walls; building y-axis for shades)and the surface outward normal (see Fig. 111.8). X, Y, and Z are thecoordinates (relative to the space coordinate system for exteriorwalls; relative to the building coordinate system for building shades)of the lower left-hand corner of the surface as viewed from outside(i.e., in a direction opPosite to the surface outward normal).Horizontal or nonvertical surfaces are trickier. The TILT is determinedas before. Choose the origin of the surface and specify valuesfor X, Y, and Z. Next, mentally rotate the surface to a verticalposition such that the origin does not move (see Fig. III.9). SpecifyAZIMUTH, which is again the clockwise angle between the relevanty-axis and the outward normal of the surface in its new position.The values of HEIGHT and WIDTH are the height and width of the surfacein its new, or vertical, position. Of course, the program will notsee the-SUrface in the vertical position because the TILT, which wasspecified before mentally rotating the surface to vertical, wasalready established at its true value.CAUTION: The incorrect specification of AZIMUTH can result in coincidentwalls, inside out walls, outward protruding walls, bay windowsinstead of setback windows, direct sunlight through north facingwindows, incorrect shading, and a whole host of other problemstoo numerous to mention. In complicated buildings these effects maynot be readily noticeable in the simulation output.If a building has exterior shading, either from itself or from otherstructures, X, Y, and Z should not be allowed to default to zero.c. Locating Windows and DoorsLocating and orienting windows and doors is rather simple. The userneeds to specify X and Y in the WINDOW or DOOR instructions.(Exception: if there is no exterior shading, X and Y may be allowedto default to zero.) The opening is regarded as lying in the plane(the x-y plane of the surface coordinate system) of its wall. 'Valuesfor X and Y locate the lower left-hand corner of the opening, asviewed from outside, relative to the lower left-hand corner of thewall. See Fig. IILlO. The x-dimension runs parallel to the widthof the wall and opening; the y-dimension runs parallel to the height.Assigning a positive value to the keyword SETBACK will result in aIIL15 (Revised 5/81)