MIL-HDBK-1003/19
QN
- net building heat load (Btu).
QS
- utilizable solar heat (Btu).
QSL
- steady state building heat load (Btu).
QS
- monthly solar radiation transmitted through an
arbitrarily oriented solar collector (Btu/ft2-month).
QSA
- annual solar radiation transmitted through an
arbitrarily oriented solar collector (Btu/ft2-yr).
QTAn
- annual solar radiation transmitted through a vertical,
south facing aperture with n glazings arbitrarily
oriented (Btu/ft2-yr).
Rd
- thermal resistance of decorative floor or wall covering
(deg.F-ft2-hr/Btu).
Rtot
- total thermal resistance of the roof
(deg.F-ft2-hr/Btu).
R-value
- thermal resistance of a material layer or set of layers
(deg.F-ft2-hr/Btu).
RBASE
- thermal resistance of basement walls
(deg.F-ft2-hr/Btu).
RPERIM
- thermal resistance of perimeter insulation
(deg.F-ft2-hr/Btu).
RROOF
- thermal resistance of the roof (deg.F-ft2-hr/Btu).
RTAP
- thermal resistance of insulation layer in a
thermosiphoning air panel (deg.F-ft2-hr/Btu).
RWALL
- thermal resistance of the wall (deg.F-ft2-hr/Btu).
s
- heat capacity scale factor (Btu/deg.F-ft2).
S
- solar radiation absorbed per square foot of collector
(Btu/ft2).
ST
- total absorbed solar radiation (Btu).
SHF
- solar heating fraction for reference month.
SHFa
- annual solar heating fraction.
SLR
- monthly solar load ratio.
SLRm
- minimum monthly solar load ratio.
SLR*
- scaled solar load ratio.
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