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DOE-2 Reference Manual Version 2.1 - DOE2.com

DOE-2 Reference Manual Version 2.1 - DOE2.com

DOE-2 Reference Manual Version 2.1 - DOE2.com

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15. EXTERIOR-WALL (or ROOF)This instruction is used to specify the size, construction, and positionof an exterior surface of a space such as an exterior wall, roof, orexterior floor (such as above a breezeway or carport). EXTERIOR-WALLand ROOF are synonymous within the program. Each EXTERIOR-WALL instructionapplies to the SPACE instruction immediately preceding it anddescribes one of the exterior walls of that space.U-name may be used to identify each wall. A logical namingconvention minimizes errors of omission.EXTERIOR-WALL (or ROOF) This command word tells LOADS that the data tofollow specify an exterior wall, roof, or exterior floor.LIKECONSTRUCTIONGND-REFLECTANCESKY-FORM-FACTORGND-FORM-FACTORmay be used to copy data from a previously U-namedEXTERIOR-WALL instruction.is used to identify, by U-name, the previously enteredCONSTRUCTION instruction that defines the type ofconstruction used in this wall. It can be used also toidentify the code-word of a CONSTRUCTION in the <strong>DOE</strong>-2CONSTRUCTIONs Library.is the solar reflectance of the ground; that is, thefraction of sunlight incident on the ground that isreflected. The following table (see Ref. 5, Chap. 26)provides typical values for various surfaces.SurfaceOceanBituminous ConcreteWheat FieldDark SoilGreen FieldGrass, DryCrushed Rock SurfaceConcrete, OldConcrete, Light ColoredPaved AsphaltGND-REFLECTANCE0.050.100.070.080.12-0.250.240.200.220.320.18is the fraction of the hemisphere facing the wall that issubtended by the open sky.is the fraction of the hemisphere facing the wall that issubtended by the ground, adjacent buildings, trees, hills,etc.Note: SKY-FORM-FACTOR and GND-FORM-FACTOR are used in the diffuse radiationcalculation. If no entry is made for SKY-FORM-FACTOR and GND-FORM-FACTOR,they are calculated by the program by using the TILT angle of the walland ignoring the presence of BUILDING-SHADEs. The user should specifyhis own values for SKY-FORM-FACTOR and GND-FORM-FACTOR if he wishes toaccount for the shading of diffuse radiation from sky and ground.111.100 (Revised 5/81)

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