> The question is what properties can you effectively get from out of > it? > Solar infrastructure has many bases to cover: > > 1) Electricity > 2) Cooling and dehumdification > 3) Heating > 4) Hot water > > Now while the above system can clearly help with #3 and #4, #2 is > iffy > and #1 is totally unclear. If the solar energy was very cheap then say 10% efficiency for electricity would be tolerable if you could still use the remainder for heating. Even steam engines manage that. Steam is capable of over 20% efficiency so a 10% target is probably acceptable. Half my roof in winter at 50% thermal capture and 10% conversion to electricity using steam is about 10 kWh of electricity and 90 kWh of heating. In summer its almost 4 times that. If the plant was sized to deal with summer power you'd have 40 kWh / day for summer cooling if desired. The hotter the day the more he cooling available. Russell -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist