----- Original Message ----- From: "Sustainable Technologies" To: "Cathy Colwell" Sent: Wednesday, February 07, 2001 5:59 PM Subject: Re: Mainland High School, Daytona Beach, FL - #2 Dear Cathy a.. (1) What would a 100 watt, 2 square meter array cost per window? As with most technolgy products, the initial pricing will be high, decreasing as volumes increase. Our forecast price is $US 550 per sq Meter b.. (2) Which side of a building (N, S, E, W) would be best for placing permanent solar cells into windows? (Florida) North is not so good, South is slightly better but East and West are similar and acceptable. c.. (3) Would the windows still let in light for general lighting purposes? They could be designed to let in light, but they would not provide a 'view', due to non transparent areas d.. (4) What is the current efficiency of these first generation titania cells? This is a complex question. In the laboratory 11% has been achieved, but the first panels to be sold will be closer to 5.5%. It is important to note that this is a measurement at standardised laboratory conditions, not operating conditions. e.. (5) Is there a minimum angle of incidence for the light rays? NO A minimum intensity? NO A maximum wavelength of light? This depends on the spectral responce of the dye. f.. (6) Is there any correlation with latitude? Insolation typically varies with latitude. Simply, closer to equator, more sunlight, more electrical output. (Other local conditions such as cloud cover, haze also effect insolation). Angle of sun also varies with latitude, which has a big effect on silicon PV, which requires panels to be perpendicular to the rays for maximum output. The angular effect on Tiania is less, due to its nanoparticulate structure. Regards Sylvia Tulloch Thank-you so much for helping. Cathy Check out STA's web page http://www.sta.com.au Sustainable Technologies Australia Limited PO BOX 6212 Queanbeyan NSW 2620 Australia Ph:61-2-6299 1592 Fax:61-2-6299 1698