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The part not absorbed is lost back through the glazing by reflection. 5 Absorbed solar radiation. The amount of radiation absorbed by a passive solar heating system per square foot of aperture (S) is given by the product of the transmitted radiation and the absorptance. In the general case, for a one-month period, we have: S = [alpha] [multiplied by] QS. 9) The units of S are (Btu/ftÀ2Ù) per unit time. The total amount of solar radiation absorbed by a particular system (SÚT¿) is given by the product of S and AÚc¿ (or AÚp¿ where appropriate) and has units of Btu per unit time.
16) and the units are Btu. 18 Solar load ratio. The solar load ratio (SLR) is the ratio of the amount of solar radiation absorbed by the system to the effective building heat load. 18) or For tilted apertures in sunspaces, AÚp¿ must be substituted for AÚc¿. solar load ratio is dimensionless. 19 Auxiliary heat requirement. The auxiliary heat requirement (QÚA¿) is the amount of heat that must be supplied by a conventional back-up heating system to maintain the building temperature at TÚset¿ for a specified time period; the time period of interest usually has a duration of one month or one year.
These initial values should, as previously stated, be checked by design analysis calculations before proceeding to construction documents. 8 Thermal storage mass. The amount of thermal storage mass required per square foot of solar aperture depends primarily on the solar availability at the building site. The relative solar availability in the continental United States is given by the contour map in figure 8. Masonry thermal storage walls and sunspaces with masonry common walls generally employ a wall thickness of about 12 inches of high density material.