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Indirect solar gain is one of three methods of passive solar heating, in addition to isolated and direct gain. When solar heat is collected in one area and transferred to another through the process of convection, this is the indirect method.

Here's a rundown of how it works. As with most passive solar heating systems that don't require the use of mechanical pumps or fans, heat is invited indoors through a series of south-facing windows. It is then absorbed through building materials with thermal mass, or the natural capacity to absorb heat. These materials include masonry walls or floors. When placed in a container, water can be even more effective than masonry or concrete in that it exchanges heat more quickly. Water walls and roof ponds are examples of how water containers can be used for indirect solar gain. These are described below.

Very practical and cheap energy for the World.

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I rounded the north corner of the field when I spotted farmer Jacob on his new, green John Deere. I slowed my van up to almost a walking pace and eased it to the side of the road. I waiting for Farmer Jacob to arrive so I could inquire what my friend had just been planting.

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Energy Tags: wind power, battery technology

Solar is happening. And, New Jersey solar enthusiast, Ed Seliga, is walking around with a great, big smile on his face these days, because much to his amazement, delight and not a little bit of trepidation, he finds himself holding a tiger by the tail.

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In mid-June, Chongqing City held its tenth anniversary as a Special Economic Zone in western China. The city government held a fireworks display on the waterfront, with 120,000 fireworks explode in the sky. Traffic was a gridlocked mess and the business district came to a standstill. Bus engines idled and drivers continued to blow their horns as if doing so would move traffic. Walking along, I noticed the relative lack of air pollution for the large amount of vehicles. The thought dawned on me that if I were in Bangkok the air would be a toxic black cloud. Why are there such pollution differences in gridlocked Asian traffic, and how does all this relate to Peak Oil?

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