This A home energy audit involves a thorough inspection of your home, which can uncover hidden structural and safety problems before they cause major damage. For example, improper ventilation can cause mold or mildew growth, which you may not discover until it becomes severe and costly repairs are required. A RESNET Certified professional can prevent problems before they affect your health or damage your home. -319 I believe they were looking at using a dry solid form of carbon, probably in combination with other materials in the form of some kind of ceramic blocks. I dont think that method has much traction right now. You would need to run pipes down into it with heat exchangers for both heat input and heat extraction. With any of these liquid salt systems, you still need to get the heat back out to run industry standard turbines, which means that you are constrained to a certain temperature range on the output side. Its not the biggest issue, but its one of those things that constantly locks you down in other areas, such as the temp range of your storage tank. That has a domino effect all the way up the chain to the size of your mirror field and its minimum density and minimum average sunlight exposure. "homemade permanent magnet motor " and "magnetic motor schematics " (include "how do solar systems form", "cost of solar power tower ", "magnetic attraction motor ", "alternative energy home projects ", "how to build a houses ", "Home energy costs on a reserve ", Listen to live and archived green energy talk radio podcasts on Blog Talk Radio - the leading talk radio network. & Magnet motor forum )