Appendices - GSA

of the wall admits fresh air without heating in summer. Figure A-11 illustrates
how an SVP system works.
Figure A-10: Solar ventilation air preheating system schematic
SVP are very low maintenance systems as there is only one moving part, the fan.
Due to the low cost of this simple technology (about $20/sf installed) and its high
efficiency, over 2 million sf have been installed, mostly in manufacturing plants in
the Northeast and in Canada.
Savings at each site depend on both the solar resource and the heating degree
days for that site. Solar ventilation preheat is generally cost effective at the
northern sites that can use the heat through much of the year. A site with a
heating season of 4 months or longer could consider this technology. The SVP
system on a US Bureau of Reclamation water treatment plant in Leadville,
Colorado cost $28,000 and saves $4,000 per year. Figure 15 shows the
distribution of the solar resource.
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