1. Solar Collectors

2. Types Back-pass solar collectors –Used to heat air –Glazed surface –May be integrated with thermal mass Concentrating solar collectors –Best suited for clear skies –Steam production –Concentrates light at absorber which can increase efficiency at high temperature –Four forms: parabolic trough, parabolic dish, power tower, stationary solar collectors Trombe Wall –Thermal mass designed to radiate heat during the night –Glass to allow sunlight through –With added salt fillers stored energy changes from 200 cal/day to 80,000 cal/day Batch Solar Collectors –Water heating –Glazed water collectors Solar cookers Liquid Solar Collectors –Vacuum tubing

3. Manufacturers and Products SES Dish Stirling System Technology Designers of large, industrial solar dish systems Product made of huge concentrator (dish reflectors) and power conversion unit (hydrogen heating that runs pistons) Industrial Solar Technology Roof mount parabolic troughs Specifications – IST Roof Mounted Trough (RMT) System Reflective Module Size120.75 in. x 45.2 in. (3067 mm x 1148 mm) Gross Aperture Area37.9 ft2 (3.52 m2) Net Aperture Area35 ft2 (3.25 m2) Concentrator Weight55 lb (25 kg) Materials of ConstructionAluminum Reflective Surface Coated polished aluminum With 1120 ft^2 area, produces 52 kW th

4. Manufacturers and Products Solarco Manufacturing Ltd. 24 Tube Kit $2,100 Works down to -40 Celcius 93% light allowed in 3.6 ft x 4.9 ft

5. Reflecting Surfaces Cool roofs –White surfaces preferred –Metal surfaces offer high albedos but low thermal emittance –Reduce heating costs in hot environments

6. Reflecting Options Coatings ($.75 – $1.50 per square foot) –Elastomeric –Polyurethane –Acrylic Single-ply Membranes ($1.50 – $3.00) –Semi-flexible –EPDM, PVC, TPO Reflective tiles ($3.00) –Pigments allow for 70% reflection of sun’s energy Metal roofs ($2.00 and up) –With additional pigments will reflect infrared as well

7. Areas of further exploration Alternating cool roof/warming roof material? Designing our own trough system for heat Pigments for roofing Integration of a trough system Current research into reflecting light (moisture barriers)