
357Solar Heating and Cooling of Buildings
© 2008 Taylor & Francis Group, LLC
components, whose properties determine the efciency of solar thermal collectors, are
glazings and absorbers.
Unglazed, transpired solar air collectors offer a low-cost opportunity for some applica-
tions such as preheating of ventilation air and agricultural drying and curing [2]. Such col-
lectors consist of perforated absorber sheets that are exposed to the sun and through which
air is drawn. The perforated absorber sheets are attached to the vertical walls, which are
exposed to the sun. Kutcher and Christensen [3] have given a detailed thermal analysis of
unglazed t ...