MIL-HDBK-1003/19
L
- latitude (degrees).
LC
- load coefficient (Btu/deg.F-day).
LCR
- load collector ratio (Btu/deg.F-day ft2).
m
- reference month.
N
- number of months in heating season.
NGL
- number of glazings.
NGLn
- number of glazings of nonsouth windows.
NLC
- net load coefficient (Btu/deg.F-day).
NLCe
- exterior zone (Btu/deg.F-day).
NLCi
- interior zone (Btu/deg.F-day).
NSF
- non-south window fraction.
NZONE
- number of zones.
P
- period of diurnal cycle.
Pg
- ground floor perimeter (ft).
Pt
- total external perimeter of the heated floorspace (ft).
PR
- productivity (Btu/ft2).
Qact
- actual annual heating load (Btu/yr).
QA
- auxiliary heat requirement (Btu).
(QA)a
- annual auxiliary heat requirement (Btu).
QD
- delivered solar energy (Btu).
(QD)a
- annual delivered solar energy (Btu).
QE
- excess solar energy during reference month (Btu)
QI
- annual incremental cooling load (Btu).
Qint
- internal heat generation rate (Btu/day).
QL
- effective building heat load (Btu).
(QL)a
- annual effective building heat load (Btu).
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