Gringo Pillo wrote:
Composting is not new to me because in Finland nearly every house has an insulated compost (mandatory to separate biological waste)
However the use of this heat to warm water is interesting. Probably the gasoline consumption to mow a 5000 m2 yard is more than the energy you get from the compost.
has prices of many equipment including windmills and water powered generators.
Has the idea of making biogas at home spread in chile? in the south we have wood but this could be useful in the north?
what appeals to me about it, and I know it is no silver bullet, is that it would be relatively easy to convince many people in rural areas to try it because they already have similar greenhouses. Very common in the Patagonia in fact. mowing a lawn is one thing, but imagine you live in a one room shack burning wood on a 1,000 hectare ranch down south, or even a 10 hectare ranch, raising sheep, cattle or whatever. The potential energy growing around you is nearly unlimited, relative to the needs to heat a house. Especially if you consider a call to the gas guy might take a month for a new tank of propane (most use wood for cooking and hot water by the way). so, simply the yard clippings from a relatively urban lot is sufficient, down south where larger properties are the norm has big potential. Large properties, lots of biomass available, easily built, easy to understand (we are talking often people with 8th grade and below educations but experts in farming), works in wet and cloudy environments (temps do not get Wisconsin cold accept in the mountains and way down south).
the first thing I thought about when I read the descriptions was all the piles and piles of rotting hay I see in Southern Chile that they can not feed to the cows for whatever reason. Mostly because it was harvested wet. That is perfect, cheap, and free fuel that once broken down at 10 times the rate of rotting in the field, can be used as fertilizer.
I thought combining one of those systems with a simple pre-solar water heater (likly best on the way in to the house, to add another say 50 F over ambient), and then sinking the pipes outbound from the the house about 5-6 feet under ground (50-70 F constant geo temp), would likly bring a constant return water temp of over 200+ F without a lot of work or materials for the life of a house. Most of the experiments I looked at said that a constant 130 - 150 F could be reached with adding materials about every 3 months, and some up to 6 months. combined, it should be low work high return.
Regarding imports, all the solar panels, winmills, and so on are all sold in Chile. You just got to do your homework. There is a place on the highway south of Puerto Varas that specializes in renewable energy including windmills and other solutions. As I understand a gringo owns it (will investigate).