Showing posts with label Solar. Show all posts
Showing posts with label Solar. Show all posts

Wednesday, October 26, 2011

German designer makes bowl from sand using concentrated solar power and envisions a tool for solar powered production.

By way of the SASL Facebook group here's a video from Markus Kayser in which he installs a solar powered sintering* 3-D Printer which uses sand instead of they typical resins used in 3 D printers to make a rough bowl.
  
Although the film is beautiful and some have viewed it an artistic performance, Kayser sees his machine as the beginning of a productive tool for creating objects.

"In August 2010 I took my first solar machine - the Sun-Cutter - to the Egyptian desert in a suitcase. This was a solar-powered, semi-automated low-tech laser cutter, that used the power of the sun to drive it and directly harnessed its rays through a glass ball lens to ‘laser’ cut 2D components using a cam-guided system. The Sun-Cutter produced components in thin plywood with an aesthetic quality that was a curious hybrid of machine-made and “nature craft” due to the crudeness of its mechanism and cutting beam optics, alongside variations in solar intensity due to weather fluctuations.

In the deserts of the world two elements dominate - sun and sand. The former offers a vast energy source of huge potential, the latter an almost unlimited supply of silica in the form of quartz. The experience of working in the desert with the Sun-Cutter led me directly to the idea of a new machine that could bring together these two elements. Silicia sand when heated to melting point and allowed to cool solidifies as glass. This process of converting a powdery substance via a heating process into a solid form is known as sintering and has in recent years become a central process in design prototyping known as 3D printing or SLS (selective laser sintering). These 3D printers use laser technology to create very precise 3D objects from a variety of powdered plastics, resins and metals - the objects being the exact physical counterparts of the computer-drawn 3D designs inputted by the designer. By using the sun’s rays instead of a laser and sand instead of resins, I had the basis of an entirely new solar-powered machine and production process for making glass objects that taps into the abundant supplies of sun and sand to be found in the deserts of the world.

My first manually-operated solar-sintering machine was tested in February 2011 in the Moroccan desert with encouraging results that led to the development of the current larger and fully-automated computer driven version - the Solar-Sinter. The Solar-Sinter was completed in mid-May and later that month I took this experimental machine to the Sahara desert near Siwa, Egypt, for a two week testing period. The machine and the results of these first experiments presented here represent the initial significant steps towards what I envisage as a new solar-powered production tool of great potential. "


SOLAR SINTER (2MIN EDIT) from Markus Kayser on Vimeo.

From Kayser's website:

"Markus Kayser was born near Hannover, Germany in 1983. He studied 3D Furniture and Product Design at London Metropolitan University from 2004 - 2008 and continued 2009 with the study of Product Design at the Royal College of Art and gained his Master in 2011. Markus Kayser Studio was set up in London, UK in 2011.

From early works of furniture and lights in his father’s farm workshop through to today Markus Kayser developed an understanding of materials, processes and technologies which he sees as being key in combination with the natural given. He wants to engage by producing objects that one can relate to, that speak about something else other than just their utilitarian qualities. The layers to be discovered as well as one’s associations with objects interest him.

Experimentation plays a central part in developing his designs. Kayser’s recent work demonstrates the exploration of hybrid solutions linking technology and natural energy to show the great opportunities, to question current methodologies in manufacturing and to test new scenarios of production.
In his process it is important that behind the thorough research and the theory there must be a realistic proof of concept, which elucidates the real potential of a given subject. He tries to tell a story and to balance the seriousness with a sense of humour. This kind of storytelling makes his products as well as his experimental works digestible without losing its depths in content.

The aim of the newly formed Markus Kayser Studio is to engage in discussion about opportunities in the production of design involving new as well as forgotten processes and technologies. The studio draws from science, art and engineering and aims to blur gaps between seemingly separate fields. "
(SASL Finder: Chris)

Thursday, May 20, 2010

Surface area required to power the world with zero carbon emmissions and solar panels alone

I found this image here and on another sharing site.  I don't know who originated it.  I found similar ones dating back to 2007 (treehugger).  If the owner of it does not wish it to be reposted, we will remove it as soon as we are notified.

Sunday, March 7, 2010

MIT's Artificial Photosynthesis using solar power to pull the hydrogen out of water

They've received funding from ARPA-E.  MIT professor Dan Nocera says his system allows water from a puddle to be used to be split using a trickle of electricity from a photovoltaic panel with the help of a catalyst.  The hydrogen obtained from the water would be stored and burned.   The hope is that the energy your house needs could be produced at your own home.

Sun Catalytix of Cambridge Massachusetts is in the early stages of developing the process for commercial use.

Read more about the process on their website and in these articles:
With Artificial Photosynthesis, A Bottle of Water Could Produce Enough Energy To Power A House (Popular Science) and Shift happens: Will artificial photosynthesis power the world? (Scientific American)


Friday, February 26, 2010

Cal Tech flexible composite photovoltaic panels produce as much power as standard panels but using 1% of the materials

MIT's Technology Review reports on the work at Caltech by a team led by Harry Atwater to create a light trapping composite that requires one one hundredth of the silicon used in standard panels. Material Traps Light on the Cheap, February 26, 2010.

Friday, January 22, 2010

Pliny Fisk designed solar demonstration house relocated to San Antonio's Mission Verde Center


Pliny Fisk of Austin's Center for Maximum Potential Building Systems helped the 2007 Texas A&M Solar Decathlon team with a solar demonstration home called the Aggie GroHome.

After being displayed on the mall in Washington and then at A&M the home was disassembled and moved to San Antonio. It has been reassembled on the grounds of the former Cooper Middle School, at 1700 Tampico Street.

The house features modular construction, so the home can “grow” as the needs or usage change. It has a total of 465 square feet of indoor living space, with dining room, living room, entry, bedroom, patio and garage modules.

The modules are the same size, except for the entry module so they can be arranged differently, up graded, replaced or added to in the future.

The dining, living, entry and bedroom modules are at the center of the house and have windows at the top of high walls for daylighting. The kitchen extension includes a refrigerator, stove, microwave and dishwasher. The house includes space and hook-ups for a washing machine and dryer. The deck which surrounds the house has places for reflecting pools or gardens.

The house features 3 types of solar panels with batteries to store the power, a high efficiency heat pump, an energy recovery ventilator and dehumidifier, light wings for shading windows, slatted rain screens, a solar heated water storage tank and is designed to incorporate three small wind turbines.

A grand opening ceremony for the house (renamed SU CASA in the Mission Verde Center) including tours of the house will be Monday, January 25 at 1 pm at 1700 Tampico Street, San Antonio 78207.

For the project's relation to the South Texas Nuclear project expansion check out the Current's Greg Harmon's posting on the house: Cooper Center bringing green tech, training to West Side  .

Tuesday, December 1, 2009

Robert Kennedy Jr tells Solar Energy Industry Association that green technology will overthrow and democratize the energy system in the USA

At the Solar Energy Industry Association, Solar Power 09 conference October 27,2009, Robert F. Kennedy Jr delivered the keynote in which he pointed out that he believes that green technology including solar power will overthrow the oil and coal industries and democratize the energy system in this country which has corrupted our system of government in many ways.

He says that we are now learning that we must protect nature not for the birds but because nature is the infrastructure of our communities. He connects pollution to bad government saying, ""Where ever you see the large scale destruction of the environment you will also see the subversion of American democracy."

RFK Jr's talk begins three minutes into the video below. His voice is affected by spasmodic dysphonia but it doesn't stop him from delivering a powerful and insightful fact filled speech that brings together environmentalism, history, political philosophy and economics.





Thanks to Time is Energy for pointing out this presentation.

Monday, November 9, 2009

What could San Antonio and CPS do with 5.2 billion dollars (instead of putting it toward the cost of more nuclear plants)

Disclaimer: As  a group San Antonio Sustainable Living doesn't take policy positions.  Within our membership we have people who are in favor of nuclear expansion for various reasons and folks who oppose it for various reasons. 

Below is information from Energia Mia, a local coalition that opposes nuclear expansion.  A more complete version of this information is available here.

What Could You do with $5.2 billion?
About 2,500 MW of Total Capacity and 1,100 MW of Baseload Power for a lot less


San Antonio does not actually need 1080 MW – 40 percent of the two nuclear plants of nuclear power in 2020. In fact, CPS Energy is now talking about selling half of that power to other utilities. Still, if they did need 1080 MW of power by 2020, they could get it for less than $5.2 billion, In fact, an analysis found that utilizing cost estimates provided by the consultant hired by Austin Energy, CPS Energy could build the equivalent of over 2,500 MW of total energy capacity, and 1,100 MW of guaranteed electricity for less than $5.2 billion.
 
Among the measures that could more cheaply replace the need for any new nuclear power by 2020 include:
·   A more aggressive efficiency program than the 771 MW of energy efficiency they are estimating;
·   Incorporating the gains in energy efficiency they will obtain from the City’s advanced building codes;
·   Fulfilling the Mission Verde goals of a robust on-site solar program to lower energy demand and produce power locally;
·   Greater investments in wind energy, including wind with storage;
·   A significant investment in large-scale concentrated solar plants with energy storage;
·   Taking advantage of geothermal renewable energy in South Texas;
·   Investing in an additional efficient combined cycle natural gas plant;
·   Investing in industrial and institutional combined heat and power facilities;
·   Investing in a medium-scale biomass facility;
·   A more aggressive low-interest loan program for homeowners to make their homes more energy efficient and add solar water heaters and panels;
·   Improving energy efficiency services to those San Antonians least able to afford increased rates to make sure bill impacts stay low;
·   Utilizing the millions of dollars available in stimulus funds to promote energy efficiency and renewable power in San Antonio

What can you get for $5.2 Billion? Why not put our energy eggs into less risky baskets?
Extra 200 MW of Energy Efficiency                              Cost: $100 million
Install 500 MW of wind                                         Cost: $1 billion
Develop a 500 MW Solar on Rooftops Program           Cost: $210 million
Develop 500 MW of Utility-Scale Solar                    Cost: $1 billion
Install 200 MW of Wind Turbines plus Storage          Cost: $550 million
Install 100 MW of geothermal                                        Cost: $400 million
Build a 100 MW Biomass Plant                               Cost: $285 million

Wednesday, October 28, 2009

An overview prepared by Solar San Antonio of The Rifkin Report “San Antonio: Leading the Way Forward to the Third Industrial Revolution”

The following is an overview of Jeremy Rifken's report “San Antonio: Leading the Way Forward to the Third Industrial Revolution”. This overview was prepared by Solar San Antonio and is available in Word Document form on their website at this link.

THE RIFKIN REPORT – An Overview

The following is an overview of “San Antonio: Leading the Way Forward to the Third Industrial Revolution” prepared by Solar San Antonio. The full report can be read and/or downloaded at http://www.solarsanantonio.org/pdf/A_Vision_for_Sustainability.pdf
The plan incorporates the principles of what Mr. Rifkin calls the Third Industrial Revolution

Prelude: Energy Efficiency and Carbon Reduction.

Pillar One: Renewable Energy – Wind, solar, biomass, geothermal and other renewable energy sources; some centralized and lots of distributed.

Pillar Two: Buildings as Power Plants – After energy efficiency is achieved, then solar, micro-wind, etc. are added to meet part of building’s energy needs and, if possible, make building a net energy provider.

Pillar Three: Hydrogen Storage – Use the hydrogen solution to energy storage to make renewable/hydrogen hybrid the baseload power supply.

Pillar Four: Smart Grid and Plug-in Vehicles – Establish an electric grid that can manage energy consumption and receipt of power from thousands of disbursed energy generators.

Saturday, August 22, 2009

The American Recovery and Reinvestment Act needs a catchier name. How about "Cash for Clunkers: Home Edition"?


Cash for Clunkers was a big success. But the program that gives even more money to homeowners who improve their energy efficiency hasn't caused a rush at the dealers.

Perhaps its because the American Recovery and Reinvestment Act just isn't a catchy name, so based on a comment by Stephen Colley, long time SASL coordinator, we're going to call it "CASH FOR CLUNKERS: Home Edition".

The home edition of Cash for Clunkers is quite a bit more complicated than the automobile version. Tax credits are earned for installation of energy efficient devices. The IRS is still working on the final guidelines on what products qualify and on what documentation is necessary but until they do, they say to rely on manufacturer ratings and keep all your receipts and communications with sellers and installers, so there's no need to delay. IRS:Energy Incentives for Individuals in the American Recovery and Reinvestment Act .

Of course, our standard SASL disclaimer applies. (See the sidebar.) Do not rely on this site for tax advice.

Hanely Wood, the trade magazine publisher, has a great site that explains the act with regard to home improvements, www.thestimulussource.com and a regularly revised chart showing the home improvement Stimulus at a Glance.

Some improvements qualify for an unlimited 30% tax credit for all costs including parts and labor. These include: Geothermal HVAC Heat Pumps and Solar Water Heaters, Photovoltaics and Residential Wind Turbines. Fuel Cells and Microturbines earn a credit of 30% including parts and labor but limited to $500 per .5 kW capacity. This is the big credit, and you can receive credits for each of these you purchase. This is the heart of CASH FOR CLUNKERS: Home Edition.

The smaller credit is a maximum of $1500 when you spend $5000 (equipment only, no labor included) on a long list of qualifying improvements. The Congress set the standards high for these improvements. They include energy efficient windows, doors, roofing, insulation, biomass stoves, conventional central air conditioning, heat pumps HVAC (both split and the usual), furnaces and hot water boilers and theoretically water heaters, though as of today there are no qualifying models.

Although there are lots of categories for the smaller credit, you can only receive a total of $1500 in tax credits. Your credit is 30% so to get the maximum of $1,500 you must spend $5000. Any amount above $5000 will not earn additional credits in this category.

To me the really exciting thing about "CASH FOR CLUNKERS: Home Edition" is the unlimited credit for renewal energy items. Of these items, Solar Water Heaters and my favorite, Geothermal HVAC are great deals.

Southwest Mechanical Services estimates that in South Texas a geothermal system (which includes free hot water heating during A/C season) costs 35% more than the most efficient conventional system, including labor and the drilling of holes for a closed loop. With a 30% credit you get upgraded practically for free.

Even without a tax credit the energy efficiency of the geothermal will eventually make up for the price difference. Hard numbers are hard to come by because there aren't any double blind controlled HVAC studies but Southwest estimates that a geo system is 2 1/2 times as efficient as a 13 SEER HVAC heat pump.

Aside from the cost, geothermal is the one HVAC system that is just as effective when it is 105 degrees outside as when it is 88 degrees. Even if it didn't pay for itself, which it does, it pays for itself in comfort. My family's geo system cost $26,000. Under this program we would have received a $7,800 tax credit.

There are also CPS and state financial incentives to explore.

So what are you waiting for? Go out and trade your home clunker in and get some cash!

Photo courtesy of Almagill on Flickr with a Creative Commons license.

Sunday, August 16, 2009

Solar Hot Water Workshop, September 3, 2009 by Solar San Antonio and Tony Stephenson of Solar Texas


Solar San Antonio presents a Solar Hot Water workshop, September 3, 2009 at International Center 203 S. St. Mary's Street, Suite # 385, San Antonio.

Tony Stephenson
, of Solar Texas and long time member of San Antonio Sustainable Living will present information on Solar Hot Water Fundamentals, types of systems, sizing and determining the amount of storage and collectors, installation techniques for mounting collectors, options and types of pre-heat storage tanks, miscellaneous system components, sizing pumps and piping, procedure for soldering and supporting copper, pipe insulation, Controls, system fill and start-up, options for space and/or pool heating.

Tickets may be purchased through eventbrite

Friday, August 7, 2009

MIT Solar Revolution: Potential for photovoltaic produced fuel cell hydrogen and Thermophotovoltaics for conversion of waste heat to electricity

Using a catalyst of cobalt, phosphate and an electrode, professor Daniel Nocera reported in 2008 that he was able to split water into hydrogen and oxygen, which if perfected would allow for the storage of solar power in the form of hydrogen which could be used in a fuel cell.

MIT Video: Daniel Nocera describes new process for storing solar energy

The professor's work is part of the MIT Energy Initiative and was funded by the National Science Foundation and a grant from the Chesonis Family Foundation which helped to launch the MIT Solar Revolution Project.

MIT graduate student, Jing Cheng, is investigating another approach to generating energy: thermophotovoltaic, or TPV cells which use infrared radiation to produce energy. These cells are already in small scale use. The idea is that they would allow industry to capture waste radiated heat and convert it to electricity. The cells that Cheng is developing are intended to cost much less than current TPV cells to manufacture.

Sunday, July 12, 2009

Taiwan World Games stadium is largest completely solar powered sports venue

The main stadium built for the 2009 World Games (July 16 to 26) is the largest stadium to generate enough photovoltaics to power it completely. The stadium which seats 40,000 has 8,844 solar panels which will generate 1.1 million kWh per year.

The World Games are the B-list of the Olympics. Only sports that don't make it into the big show can be included. These sports include korfball (a Dutch non-contact basketball like game), Tchoukball (another non-contact ball game), inline skate hockey, ten pin bowling and Pétanque, canoe polo and fistball (a one-bounce variation on volleyball).

The solar cells lined up on the roof of the stadium were made by Lucky Power Technology LTD using equipment from 3S Swiss Solar Systems AG, Lyss.

Wednesday, July 8, 2009

US Dept of Interior announces beginning Solar "Grand Plan" implementation

There's distributed small solar power as called for in Mayor Hardberger's Mission Verde in which solar power is added where feasible near to the place where it is consumed. Then there's big solar, such as the 27 MW project which City Public Service announced June 22, 2009.

Nationally big solar is represented in the Grand Solar Plan as presented in the January 2008 issue of Scientific American. This plan called for massive solar power plants throughout the western US along with infrastructure which would allow 65% of electrical generation in the USA to come from Solar by the year 2050.

On June 29, 2009 the Department of the Interior announced plans to evaluate more than 24 separate sites which together have the potential to generate 100,000 MW of power.

Craig Severance of Energy Economy Online has an excellent analysis of the Dept of Interior announcement, the Grand Solar Plan and Western Renewable Energy Initiative.

Thanks to Christine Chapa of Solar San Antonio for passing this information on.

Below is the full text of the June 29 DOI announcement:

Secretary Salazar, Senator Reid Announce ‘Fast-Track’ Initiatives for Solar Energy Development on Western Lands

LAS VEGAS, Nevada – Under initiatives announced today by Secretary of the Interior Ken Salazar and U.S. Senator Harry Reid (D-NV), federal agencies will work with western leaders to designate tracts of U.S. public lands in the West as prime zones for utility-scale solar energy development, fund environmental studies, open new solar energy permitting offices and speed reviews of industry proposals.

“President Obama’s comprehensive energy strategy calls for rapid development of renewable energy, especially on America’s public lands,” said Secretary Salazar. “This environmentally-sensitive plan will identify appropriate Interior-managed lands that have excellent solar energy potential and limited conflicts with wildlife, other natural resources or land users. The two dozen areas we are evaluating could generate nearly 100,000 megawatts of solar electricity. With coordinated environmental studies, good land-use planning and zoning and priority processing, we can accelerate responsible solar energy production that will help build a clean-energy economy for the 21st century.”

“I want to thank Secretary Salazar for his commitment to renewable energy, and for being here in Nevada today,” said Reid. "This is the Secretary's second visit to Nevada to announce key renewable energy initiatives that will help make Nevada the blueprint for everything that’s right about the future of our nation’s energy policy. We’ve got sunny skies, strong winds, and land that when used properly, will allow us to lead the nation’s children into a cleaner, more efficient, and more profitable tomorrow.”

Under one initiative, 24 tracts of Bureau of Land Management-administered land located in six western states, known as Solar Energy Study Areas, would be fully evaluated for their environmental and resource suitability for large-scale solar energy production. The objective is to provide landscape-scale planning and zoning for solar projects on BLM lands in the West, allowing a more efficient process for permitting and siting responsible solar development.

Those areas selected would be available for projects capable of producing 10 or more megawatts of electricity for distribution to customers through the transmission grid system. Companies that propose projects on that scale in areas already approved for this type of development would be eligible for priority processing. The BLM may also decide to use alternative competitive or non-competitive procedures in processing new solar applications for these areas.

Secretary Salazar and Senator Reid also announced the opening of a new Interior renewable energy coordination office (RECO) in Nevada, the first of four, with the others located in Arizona, California, and Wyoming. The offices will help to expedite processing of the increased number of applications for renewable energy projects on U.S. lands.

Currently BLM has received about 470 renewable energy project applications. Those include 158 active solar applications, covering 1.8 million acres, with a projected capacity to generate 97,000 megawatts of electricity. That’s enough to power 29 million homes, the equivalent of 29 percent of the nation’s household electrical consumption. The BLM will continue to process existing renewable energy applications, both within and outside of the solar energy study areas.

Interior also is coordinating with states to expedite permitting for a number of solar power projects nearing approval. The BLM will begin site-specific environmental reviews for two major projects in Nevada that would have a combine capacity of more than 400 megawatts of electricity: the NextLight Silver State South array is planned to produce 267 megawatts; and the NextLight Silver State North would produce about 140 megawatts. Interior continues to work with the Western Governors Association to develop renewable energy zones and transmission corridors.

The Solar Energy Study Areas, located in Nevada, Arizona, California, Colorado, New Mexico and Utah and outlined in maps to be published in the Federal Register Tuesday, encompass about 670,000 acres. Only lands with excellent solar resources, suitable slope, proximity to roads and transmission lines or designated corridors, and containing at least 2,000 acres of BLM-administered public lands were considered for solar energy study areas. Sensitive lands, wilderness and other high-conservation-value lands as well as lands with conflicting uses were excluded.

As part of this initiative, the BLM will segregate the study areas from new mining claims and other actions initiated by third parties under public land laws. This temporary 2-year segregation will give BLM time to complete its environmental review and make a determination on solar energy zones. It will not affect rights established prior to the temporary segregation. The public will have the opportunity to comment on these proposed solar energy study areas during the environmental reviews before any final decisions are made. The evaluation is expected to be completed in late 2010.

An ongoing federally-funded environmental evaluation of potential solar energy development on public lands in 6 Western States, known as the Solar Programmatic Environmental Impact Statement, or PEIS, will be expanded to include an in-depth analysis of the potential impacts of utility-scale solar energy development on public lands in the 24 Solar Energy Study Areas. This enhancement will be supported by additional federal funding under the American Recovery and Reinvestment Act. The BLM will continue to process the 158 active solar applications during preparation of the PEIS. The bureau will also continue to accept new applications both within and outside of the Solar Energy Study Areas. However, these applications will be subject to any decisions made from the Solar PEIS.

This expanded evaluation, a collaborative effort with the Department of Energy, will allow the Bureau of Land Management to take a close look at each study area to determine where it makes sense to develop large-scale solar projects in an environmentally responsible way. Companies proposing solar energy projects in designated areas would be able to “tier” to this study, using it as part of their environmental impact studies for site-specific projects, which are required by the National Environmental Policy Act.

Additional information on the BLM’s renewable energy program is available at www.blm.gov

Sunday, June 28, 2009

"Solar 102" training July 17 at the Bright Shawl

From Solar San Antonio:
Come join solar stakeholders from across the City of San Antonio for a “Solar 102” workshop at the Bright Shawl on July 17th, 2009 8:00 am to 2:00 pm.

Hear from solar experts as we discuss solar installation, solar sizing, solar certification, solar hot water, and solar financing through CPS’s new STEP Program. Attendees will receive information about local solar installers, have the opportunity to network with solar industry leaders, learn about career options in solar, and discover where solar is headed in San Antonio.

Breakfast and lunch will be included in the ticket price ($76.88), as well as six info sessions taught by regional solar certification institutes and local solar providers.
Agenda items include: “The State of Solar”- high performance building, political and economic issues, Testimonials: Why go solar?-Solar economics, payback time, doing solar in SA, Learning Sessions (each followed by a brief Q&A),KW data & photovoltaics, Solar Installation, Solar Hot Water, Local Solar financing, CPS Certification Standards and NABCEP (North American Board Certified Energy Practitioners) certification.

Register and make your payment at the Eventbrite site for this event.
Let others know you intend to attend through San Antonio Enviroment Meetup.

Monday, June 8, 2009

American Solar Energy Society home tour to include San Antonio, October 3 & 4 2009

From Christine Chapa of Solar San Antonio comes this information:
The American Solar Energy Society National Solar Tour is the largest grassroots solar event in history. Tour homes and buildings to see how your neighbors are using solar energy to reduce their monthly utility bills -- and how you can too.

Last year close to 140,000 attendees visited some 5,000 buildings in 3,000 participating communities. Now in its 14th year, this event is coordinated nationally by the nonprofit American Solar Energy Society. It takes place annually during the first Saturday in October in conjunction with National Energy Awareness Month.

An increasing focus of the tour is on energy-saving techniques and sustainability through building design, energy efficient appliances, and use of green materials during remodeling. Tours also provide helpful, real-world examples of costs and how to save money with federal, state, and local incentives,

Ultimately the tour inspires people across the nation to make sustainable energy choices that help lower costs, support energy independence, protect against power outages, and reduce carbon emissions. We invite you to join the renewable energy revolution by participating in the ASES National Solar Tour.

2008 marked the first year San Antonio participated by featuring ten homes and buildings in Bexar County. Participating 2009 San Antonio locations will be posted soon.
Sounds great! Be sure to mark your calendars. You can indicate your support for the event by your RSVP on the event's Facebook page.

Monday, May 18, 2009

June 28: Cool House Tour, Austin

The Texas Solar Energy Society presents the 2009 Cool House Tour, June 28, 2009.

For San Antonians this is a great event to which to carpool. Be sure to check out our Facebook group. It will be a "related event".

This is a great opportunity to visit some of Austin’s best examples of sustainable home design. A $15 guidebook to the locations serves as your ticket and provides directions. They go on sale at Austin Central Markets Westgate , Austin Central Market North Lamar and online at the Texas Solar Energy Society website June 1, 2009.

Each project will have a full page devoted to its significant features and sustainable highlights, along with photos, so you can choose what you want to see and go at your own pace.

I've attended these tours in the past and they are filled with surprises, inspiration and interesting buildings.

Monday, May 11, 2009

Attic Fan operation in words and pictures

San Antonio Sustainable Living member and owner of Solar Texas(soltx.com), Tony Stephenson, explains the effect of the sun on a simple ventilated attic, as contrasted to a ventilated attic with an attic fan.

#1 - A home with simple vents and no attic fan.

Effects of the sun's heat on a home in the morning: Attic is about the same temperature as the ambient temperature. The sun hits the roof and the attic starts to warm.



#2 - A home with simple vents - no attic fan. Effects of the sun's heat on a home in the afternoon:

Towards the afternoon, the attic is considerably hotter than ambient. Air has expanded with the heat in the attic. There is so much heat, the vents and soffits just allow the attic air room to expand...everywhere. The hot air pushes out from the vents and soffits and gable vents.
Ideally, it would be great to have fresh, outside air coming in under the eaves through the soffits or gable vents, across the ceiling joists and rafters and out the vents on top of the roof. This is what a good solar powered attic ventilation fan is designed to do.



#3 - A home with simple vents - no attic fan.

Effects of the sun's heat on a home in the evening:
In the evening, insulation holds in the heat from the day like a sleeping bag left out in the sun. Cool, humid night time air returns to the attic as the attic cools and the air brings moisture with it. Process repeats every day.

When installed, a solar powered attic fan comes on when the sun comes up and goes off when the sun sets and will keep the attic close to ambient temperatures all day. In doing so, the extreme temperature variations are minimized and moisture and mold issues are virtually eliminated. The AC ductwork is usually in the attic and keeping the attic close to ambient allows the AC system to work a little easier.

My best results have been with attic fans near roof peaks with ample airflow from the attic extremities. Best result was with a home in Shavano Park where the homeowner's utility bill went from $385 in May 2008 to $247 in July (not a scientific evaluation). Fans were installed in mid-June.

A good attic fan should draw at least 1150 cubic feet per minute (cfm) of airflow. Anymore than 1575 cfm will start to bring conditioned air up from the home below through light fittings and other ceiling penetrations.


#4 - A home with solar attic ventilation fan in the afternoon.

With a good solar attic ventilation fan, the heat from the sun doesn't get a chance to build in the attic. The fan comes on when the sun is shining on the roof and brings a flow of fresh air through the attic. The fan comes on in the morning, even before the heat in the attic starts to build.

Originally posted to the SASL Facebook group.

Wednesday, May 6, 2009

Jigar Shah of SunEdison will keynote Solar San Antonio's 10th anniversary luncheon May 19th

This is not a traditional luncheon, but rather an opportunity to participate in a pretty historic celebration. Jigar Shah, founder of SunEdison (world's largest solar power services provider) will keynote Solar San Antonio's 10th anniversary and founder Bill Sinkin's 96th birthday. Mr. Sinkin was adamant that this event not be overrrun with corporate sponsors and that seats be reserved for individuals who are passionate about solar and renewable energy.

Please join fellow advocates, activist and socially/environmentally conscious neighbors for a celebratory luncheon in honor of the 10th anniversary of Solar San Antonio & Bill Sinkin’s 96th birthday

May 19, 2009
11:15 a.m. Registration
12:00 p.m. Luncheon & Program

Pearl Stable
The Historic Pearl Brewery
312 Pearl Parkway, San Antonio, Texas 78212

Individual Tickets: $96
Purchase tickets online at www.solarsanantonio.org
or R.S.V.P. by May 15 to 210.313.2445 or rsvp@solarsanantonio.org

Essentially SunEdison installs the solar system and continues to own and maintain the system. The energy user pays a fixed fee over a long term for the energy consumed. Using the contracts to purchase energy as collateral, SunEdison attracts lenders, who also benefit from a package including city and state solar rebates, accelerated depreciation benefits, and a thirty percent Federal tax write-off.

The energy user benefits from a fixed energy price, savings in electricity cost over time, and reduction in carbon emissions.

This win-win combination brought SunEdison from a start-up company in 2003 to a company that operates 200 commercial installations with a total capacity of 60 megawatts.

Overall, from 2000 to 2007, worldwide investment in solar rose from $66 million to $12.4 billion. In the 2004-2007 period, United States investment rose from $215 million to $3.2 billion. With innovators like Mr. Shah, this level of investment will skyrocket over the next decade.

Mr. Shah left SunEdison to pursue new and innovative endeavors. He will share his experience at SunEdison and his newest ideas at the luncheon on May 19.

The online version of OnEarth's article of Jigar Shah can be found here:
http://www.onearth.org/article/selling-the-sun?page=all

Monday, May 4, 2009

25 x '25 Alliance seeks increased use of renewable energy


How does the goal of 25% of the United States' energy production coming from farms, forests and ranches by the year 2025 sound? That's the goal of the 25 x'25 Alliance.

The 25 x '25 Alliance grew out of discussions of the Bioenergy and Agriculture Working group of the Energy Future Coalition, a group which is supported financially by Better the World Fund, the Turner Foundation, the Rockefeller Brothers Fund, the Annenberg Foundation
and the William and Flora Hewlett Foundation among others.

The Energy Future Coalition describes itself as "a broad-based, non-partisan alliance that seeks to bridge the differences among business, labor, and environmental groups and identify energy policy options with broad political support. "

Its advisory council includes Paul Gorman of the National Religious Partnership for the Environment, Kevin Knobloch, of the Union of Concerned Scientists, R. James Woolsey, former Director of the Central Intelligence Agency, Michael J. Sullivan, General President of the Sheet Metal Workers' International Association and John B. Ritch III, Director General of the World Nuclear Association.

The 25 x '25 Alliance lobbies at the federal and state level for Biofuels, Solar, Wind, Hydropower, Geothermal Electric production, and Energy Efficiency.

The 25 x 25 Action Plan calls for supportive policies in each of five areas:
  • Increasing production of renewable energy
  • Delivering renewable energy to markets
  • Expanding renewable energy markets
  • Improving energy efficiency and productivity
  • Strengthening conservation of natural resources and the environment

Monday, April 13, 2009

A Window that will Heat and Cool Your Home: KSD Solar Window

From ÖKO-Logic in Germany comes a well insulated window that spins to allow you to set it with the seasons. In the winter setting it accepts 70% of the sun's heat. In the summer setting it reduces penetration of the sun's heat producing rays by 70%.

Not only is this window efficient, it can be switched from a winter position in which it gains heat to a summer position in which it rejects heat.

The KSD window has six layers: white glass, SZR with argon gas, low-E-coat, float glass, Foil and green glass. In the winter the green glass layer is on the inside. In the summer it is on the outside.

The window has been available for some time in Germany, but I could not determine whether the company they set up to bring it to the USA, Eco-Logical Innovations, has been able to set up distributors yet.  (04/2011  Links to  distributor appear dead.  Here is a link to a mostly English brochure for the window produced in 2007.)



Winter Position
Summer Position
Air temperature Fahrenheit
Outside = 32
Inside = 68
Outside = 32
Inside = 68
Sun energy
(Watt per square meter)
Temp. outside window pane
Fahrenheit
Temp. inside window pane
Fahrenheit
Temp. outside window pane Fahrenheit
Temp. inside window pane Fahrenheit
0
34.34
61.34
69.62
68.36
100*
35.96
70.34
74.66
69.62
300
37.94
85.46
84.2
71.96
500
40.28
98.60
98.6
74.3
700
42.62
110.84
102.92
77
* Example: Already at 100 watts of solar energy in the winter time (cloudy sky) and at outside temperature of 32 degrees Fahrenheit, the inside window pane heats up to over 70 degrees. As a result a thermal barrier is created and no energy is lost through the window, effectively reaching a U rating of zero.

The video below features a demonstration of the window at a European trade show.