MIL-HDBK-1003/19
c
- specific heat (Btu/lb-deg.F).
C
- capital invested ($).
D
- solar declination (degrees).
DF
- diurnal heat capacity thickness function.
DD
- heating degree days (deg.F-day).
DDa
- annual heating degree days (deg.F-day/yr).
DDact
- annual heating degree days based on actual average
indoor temperature (deg.F-day/yr).
DDm
- heating degree days for harshest winter month in a
particular location (deg.F-day/month).
DHC
- diurnal heat capacity (Btu/deg.F).
ed
- delivery efficiency.
et
- total system efficiency.
eu
- utilization efficiency.
(eu)a
- annual utilization efficiency.
E
- annual energy saved (MMBtu/yr).
EF
- effective heat capacity heat thickness function.
EFi
- effective heat capacity heat thickness function for
element i.
EHC
- effective heat capacity (Btu/deg.F).
f
- area factor.
F
- scale factor.
G
- effective aperture conductance (Btu/deg.F-day ft2).
h
- ceiling height (ft).
hr
- duration (hours).
k
- thermal conductivity (Btu/deg.F-ft-hr).
Kb
- frontflow/backflow parameter for thermosiphoning air
panels.
l
- thickness (ft).
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