- load coefficient (Btu/deg.F-day).
- load collector ratio (Btu/deg.F-day ft2).
- reference month.
- number of months in heating season.
- number of glazings.
- number of glazings of nonsouth windows.
- net load coefficient (Btu/deg.F-day).
- exterior zone (Btu/deg.F-day).
- interior zone (Btu/deg.F-day).
- non-south window fraction.
- number of zones.
- period of diurnal cycle.
- ground floor perimeter (ft).
- total external perimeter of the heated floorspace (ft).
- productivity (Btu/ft2).
- actual annual heating load (Btu/yr).
- auxiliary heat requirement (Btu).
- annual auxiliary heat requirement (Btu).
- delivered solar energy (Btu).
- annual delivered solar energy (Btu).
- excess solar energy during reference month (Btu)
- annual incremental cooling load (Btu).
- effective building heat load (Btu).
- annual effective building heat load (Btu).