MIL-HDBK-1003/19
3.
DEFINITIONS
3.1
Definitions of acronyms and symbols used in this handbook.
[alpha]
- solar aperture absorptance.
[alpha]ir
- infrared absorptance.
[W-DELTA]TI
- temperature increment without ventilation (deg.F).
[theta]
- tilt of solar collector relative to vertical plane
(degrees).
[rho]
- density (lb/ft3).
[tau]
- building time constant (hr).
[open phi]
- azimuth of solar collector (degrees).
a
- city parameter.
Aa
- actual roof area (ft2).
Ac
- solar collection area (ft2).
(Ac/Af)o - reference ratio of collector area to floor area.
Ae
- external surface area of a building or thermal zone
(ft2).
Af
- heated floorspace (ft2).
Ag
- ground floor area (ft2).
Ai
- mass area of element i (ft2).
Am
- thermal storage mass surface area (ft2).
An
- non-south window area (ft2).
Ap
- projected area of solar collection aperture on a
vertical plane (ft2).
Ar
- roof area projected on a horizontal plane (ft2).
As
- total south wall area (ft2).
Aw
- wall area (ft2).
ACH
- air changes per hour.
ADR
- air density ratio.
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