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Renewable Energy Group

This group is for learning and sharing all information about renewable energy - Solar Power, Wind Power, Alternative fuels & Transportation....

Location: California
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Latest Activity: Jun 24

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Solar Wind

Discussion Forum

Enhanced GeoThermal Systems

What does everyone think of this type of energy and technology?   Continue

Started by Darlene Cavallara Oct 30, 2011.

Energy - The Number One Issue 4 Replies

We thought we would start the first discussion in this group with some thoughts about the issues that face us not just in regards to peak oil and fossil fuel.  Let's talk about energy in general -…Continue

Tags: Energy

Started by Darlene Cavallara. Last reply by Evan Spurrell Apr 10, 2011.

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Comment by Darlene Cavallara on October 29, 2011 at 12:12am

Check out what Google is backing - Enhanced Geothermal Systems

 

EGS: What is an Enhanced Geothermal System?

Geothermal PlantAn Enhanced Geothermal System (EGS) is an engineered subsurface heat exchanger designed to either extract geothermal energy under circumstances in which conventional geothermal production is uneconomic, or to improve and potentially expand the production operations so that they become more economic. Most commonly, EGS is needed in cases where the reservoir is hot but permeability is low. In such systems, permeability may be enhanced by inducing slippage along preexisting fractures (often called hydroshearing) or by hydraulic fracturing, using high-rate water injections, and/or chemical stimulation, or a combination of both. In some cases very little pressure is needed to cause a permeability increase, in others high pressure may be needed. It depends on the in-situ fracture patterns, stress magnitudes/orientations and rock strength. Once the permeability has been increased, production can be sustained by injecting water (supplemented as necessary from external sources) into injection wells and circulating water through the newly created permeability, where it is heated as it travels to the production wells. As the circulating water cools, the engineered fractures, induced seismicity, and chemical dissolution of minerals may also create new permeability, continually expanding the reservoir and exposing more heat to be mined.

Comment by Fred Klammt on May 1, 2011 at 6:43pm
Hi Mary:  For solar cooking - I bought a  'kids cocoon' chair  from Ikea once (it's round and parabolic shaped) for $4...  glued a $1 car sun shade reflector inside it and put a black 1 qt pan in the bottom... it boils water in about 20 minutes - in the summer time.  Solar cooking is a real niche area....  making your own as the books Samantha references and various internet links - like you tube and http://www.cookwiththesun.com/solar.htm  are plentiful.  Above all - have FUN!
Comment by mary rose on May 1, 2011 at 10:58am
This is wonderful information to have, particularly interested in that posted by Samantha as i am try to get info like this into our Community Center here for distribution to our small community of about 750 people.  Thanks everyone.
Comment by Fred Klammt on May 1, 2011 at 7:08am

Lo-Cost DIY solar

I've discovered it costs 70%+  less $ to put in your own simple solar  HW or PV system without following the bureaucratic and corporate utility-driven CSI (California Solar initiative) rules.  The only catch is you need to provide your own labor or find somebody else to install it properly. 

 

Here's a couple examples from my presentations on lo-cost energy:

 

Lo-Cost DIY Solar Hot Water Drainback System

  • 2 Absorber Plates (wholesale- El Cajon) $530.//DC Variable pump (Hartnell)$180.// Reservoir tank$  50.//Copper Piping + Fittings $100.//∆T controller + Wiring.$140.//Misc (Framing, used Patio Door Glass $200.                                     
  •  ~TOTAL $1,200.// minus 30% Fed Tax Credit on equipment  $360.// 
  • ~ net total cost $840.

 Lo-Cost DIY  Solar PV Stand-alone System

  • 2 Collectors (270Watt) $750.//Controller $  56.// Inverter $860.//Battery (2) (optional) $290.//Monitor (optional).$140.//Wiring, shunt, Misc $200.
  • ~TOTAL$2,296.// minus 30% Fed Tax Credit on equipment $ 688.80.
  • ~ net total cost  $1,607.
Comment by David Eggleton on April 9, 2011 at 4:45am

Reduction of energy use is a closely related option, which, of course, may also be imposed (on more and more entities).  Here's information about an opportunity, called the Thousand Home Challenge, to contribute your perspectives on the process and its outcomes.

Comment by Darlene Cavallara on October 7, 2010 at 11:48pm
Thanks for the link - we are going to try to post it on the main page so that folks can easily find it. It falls under the 'primary resource' list for sure :-) Hmmm...maybe we will create a page on the main bar with that title....

Cheers!
Comment by Samantha on October 7, 2010 at 1:49pm
While I was searching, lo and behold, I found a compendium of solar cooker plans here:

http://solarcooking.org/plans/

something for everyone here...great resource!
Comment by Samantha on October 7, 2010 at 1:38pm
I just realized some stuff is on another computer, so I'll have to crank it up and search. Meanwhile, I did find this in the list of recommended books from SEI. Prices may have changed, because it's a few years old, but then, check Amazon...

Solar Cooking

Cooking with the Sun, Beth & Dan Halacy, Morning Sun Press, CA, 1992.

How to use the sun's energy to cook food, including detailed plans to build a solar oven. Available from Solar Energy International. $8

Heaven's Flame, Joseph Radabaugh, Home Power, 1991.

Complete instructions on how to build the SunStar solar cooker plus a discussion of numerous solar cooker designs. Available from Home Power Magazine, PO Box 520, Ashland, OR 97520. (916) 475-3179. $10

The Expanding World of Solar Box Cookers, Barbara Kerr, 1991.

The history and theory behind solar cooking, along with plans and instructions for building and using a solar box cooker. Available from Kerr-Cole Solar Box Cookers, PO Box 576, Taylor, AZ 85939. $10
Comment by Samantha on October 7, 2010 at 1:32pm
Hi everyone,

I'll dig up my directions and post. Thanks for responding.

Light and Peace,

S.
Comment by Judith Newton on October 7, 2010 at 12:13pm
I'd love the info, too. I have a Sun Oven (made black beans in mine yesterday) and I use my car for a solar dryer... it works great in our dry, warm summers! A solar sauna sounds wonderful, too.
 

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