Overview
System type: Pressurized solar water and space-heating system
Location: Amherst, Wisconsin
Solar resource: 4.2 average daily peak sun-hours
Production: 7.2 kBtu per month (average)
Climate: 8,500 heating degree days
Percentage of hot water produced annually: More than 80%
Percentage of space heating produced annually: More than 75%
Equipment
Collectors: 320 sq. ft. of custom-made flat plate collectors
Collector installation: Roof-mounted, facing south at a 50° tilt
Heat-transfer fluid: Wausau Chemical Co. “HT” propylene glycol, 50% dilution
Circulation pump: March 809 HS, 12 VDC
Pump controller: PV-direct (no controller)
Storage
Tank: 80 gal. domestic water storage
Heat exchanger: AAA Solar Quad-Rod, 5 ft. thermosyphon
Backup DHW: Quietside dual-core condensing boiler
Other: 2,100 cubic feet of sand bed space-heating storage
