
525Passive Solar Heating, Cooling, and Daylighting
© 2008 Taylor & Francis Group, LLC
9.5.1 First Level: Generalized Methods
A rst estimate or starting value is needed to begin the overall passive system design
process. Generalized methods and rules of thumb have been developed to generate initial
values for solar aperture size, storage size, solar savings fraction, auxiliary heat required,
and other size and performance characteristics. The following rules of thumb are meant to
be used with the dened terms presented earlier.
9.5.1.1 Load
A rule of thumb used in conventional building design is that a design heating load of 120–
160 kJ/CDD per m ...