Transitioning to carbon neutral electric generation would replace a big climate problem in the U.S., since about 60% of its electricity comes from burning natural gas.
The World Energy Forum forecasts that around 40% of electricity could be from wind and solar doing most of the heavy lifting by 2040, enabling a net zero global future.
Today hydropower provides about 16% of the world’s electricity, generating power in all but two U.S. states. 80% to 90% of our electricity at the lab comes from the wonderful Columbia River.
ARC is working to clean up combustion so renewable biomass (domestic switch grass, for example) could cook food and heat homes when fossil fuels are no longer available.
Reading a book at night in a warm house is a wonderful thing. Somebody is playing the piano… Dinner was great.
http://aprovecho.org/wp-content/uploads/2023/05/image-1-e1683852943480.png574900Kim Stillhttp://aprovecho.org/wp-content/uploads/2015/11/Aprovecho-Logo.pngKim Still2023-05-18 12:43:332023-05-18 12:43:35Electricity: Planning for Net Zero by 2040
If renewable switch grass, for example, was burned cleanly enough biomass could join solar, wind, hydro, and thermal energy as sustainable energy replacements in the post fossil fuel era. ARC estimates that an emissions rate of 0.3 grams/hour of PM2.5 would protect air quality in cities and meet the Paris Agreements when replacing natural gas.
Not all that hard to do…
“Earth is likely to cross a critical threshold for global warming within the next decade, and nations will need to make an immediate and drastic shift away from fossil fuels to prevent the planet from overheating dangerously beyond that level, according to a recent report from the Intergovernmental Panel on Climate Change.
… It says that global average temperatures are estimated to rise 1.5 degrees Celsius (2.7 degrees Fahrenheit) above preindustrial levels sometime around ‘the first half of the 2030s,’ as humans continue to burn coal, oil and natural gas.
…Under the 2015 Paris climate agreement, virtually every nation agreed to ‘pursue efforts’ to hold global warming to 1.5 degrees Celsius. Beyond that point, scientists say, the impacts of catastrophic heat waves, flooding, drought, crop failures and species extinction become significantly harder for humanity to handle.” –Brad Plumer reporting in the New York Times, 4/21/23
On the other hand, transitioning to renewability accomplishes an almost universal dream of humanity.
http://aprovecho.org/wp-content/uploads/2015/11/Aprovecho-Logo.png00Kim Stillhttp://aprovecho.org/wp-content/uploads/2015/11/Aprovecho-Logo.pngKim Still2023-04-28 16:42:352023-04-28 16:42:37Earth Day 2023: The Future Can Be Fun!
Depending on the size of the home, winter heating with a pellet burning stove uses from 2 to 6 tons of wood pellets per year. If the average house burned 3 tons per year, 3,729,400 homes could be heated with pellets currently manufactured in the USA. There are 142,153,010 residences in the USA. biomassmagazine.com/plants/listplants/pellet/US/
Bill Gates has written that the climate crisis can be solved by developing least cost, renewable technologies to replace fossil fuels. (“How to Avoid a Climate Crisis”, 2021)
Fuel switching from natural gas to renewably harvested wood pellets or split logs or dried wood chips (only if they can be burned cleanly enough to meet the Paris Agreements) seems to include a relatively small Green Premium. Replacing LPG/Propane, electricity, and Fuel Oil #2 with wood pellets seems like a good deal.
The direct burning of biomass seems to be dramatically more efficient compared to ethanol for applications such as home heating, cooking, heating water, or drying clothes. It makes sense that not having to create alcohol from biomass would save energy. When the use of natural gas is decreased (due to climate change), burning biomass for heating seems like a fuel-efficient option that could reduce the extra burdens on electricity.
One of my favorite reference books is “The Energy Primer” published in 1974. It has comprehensive review articles on solar, wind, water, and biomass energy. The following chart comes from a great article on biomass written by Richard Merrill. It shows that when renewable biomass is combusted, the efficiencies are much higher compared to making alcohol from biomass and then burning it.
The very clean burning of biomass allows efficient heating applications.
http://aprovecho.org/wp-content/uploads/2022/01/1.5.22-chart.jpg10411160Kim Stillhttp://aprovecho.org/wp-content/uploads/2015/11/Aprovecho-Logo.pngKim Still2022-12-16 17:16:142022-12-16 17:16:15Ethanol or Direct Burning for Heating Applications?
How can smoke, extremely dangerous for health and climate change, be ignored in carbon credit equations? Carbon dioxide and methane are counted but not smoke. Carbon dioxide is reduced when heat transfer is improved resulting in less wood being burned. Wood doesn’t make appreciable amounts of methane.
Because smoke is not counted to earn carbon credits, smoky stoves with good heat transfer efficiency make as much money as clean burning stoves even though the Black Carbon in smoke is something like 680 times worse than CO2 by weight for warming. Because smoke is not included in climate credit math, adding clean burning to biomass cook stoves usually has to be as inexpensive as possible.
We know that adding high pressure mixing to Rocket stoves dramatically reduces smoke. As of 2022, forced draft is required to achieve adequate amounts of mixing. Mixing requires high pressures that (so far) cannot be made with natural draft. We know how to improve the Rocket but are in the process of completing the transformation to clean burning.
http://aprovecho.org/wp-content/uploads/2022/09/44527589921_65c870e76f_c.jpg370799Kim Stillhttp://aprovecho.org/wp-content/uploads/2015/11/Aprovecho-Logo.pngKim Still2022-09-16 16:19:192022-09-16 16:24:57A Recent History of the Rocket Stove: 2022
In Part 1, we gave examples of how field studies can provide unpleasantly surprising results. Rocket stoves were designed to make a little less smoke and use substantially less fuel. So when the rocket stove was field tested by USAID the inventor, Dr. Larry Winiarski, was not surprised that the stove still made smoke. But the ARC team was surprised that it was not a real improvement over the open fire.
In 2011 the goals for cookstoves published by the Department of Energy asked that a stove use 50% less fuel and make 90% less PM2.5 to protect health when used indoors. Now in 2022 stoves are also supposed to address climate change, which means emitting less PM2.5 and hopefully making less than 8% black carbon. Field tests show that we need to make more improvements to meet these specific goals.
How
are these reductions achieved in the lab?
Use a chimney to reduce in-home concentrations of CO and PM2.5.
In lab tests, approximately 850°C gases need to flow in tight channel gaps around the pot(s) to reduce the fuel used to cook by about 50%.
Molecular mixing at 850°C (0.2 second residence time) can achieve something like a 90% reduction of PM2.5 (requires forced draft in a Rocket stove).
This mixing reduces greenhouse gas emissions by about the same amount.
Natural-draft and forced-draft TLUD stoves burning pellets and forced draft Jet-Flame stoves burning dry sticks without bark get close to these reductions in the lab. Unfortunately, they frequently do not yet meet these goals in the field.
The lab has to move into the field to learn if current technology can accomplish modern goals. Let’s go!
Next week in Part 3: sometimes field tests show success.
http://aprovecho.org/wp-content/uploads/2022/05/threestonepreference.jpg11211200Kim Stillhttp://aprovecho.org/wp-content/uploads/2015/11/Aprovecho-Logo.pngKim Still2022-07-01 15:57:102022-07-01 16:07:42Learning From The Field, Part 2
I recently read a Time article that pointed out that shipping accounts for 2.2% of annual global greenhouse gas emissions. To put it in perspective the writer, Aryn Baker, suggests that if shipping was a country, it would be the sixth largest CO2 emitter in the world, on par with Germany.
In her reporting from last year’s COP26 (UN Climate Change Conference), she writes:
“It doesn’t matter if
we want iPhones that come from China, steaks from Brazil or to tow an iceberg
to Glasgow; we all depend fundamentally on international shipping for
everything that we do,” says Johannah Christensen, head of the Global Maritime
Forum.
“This just underscores the importance of decarbonizing
shipping.”
Some ferryboats have transitioned to battery power. For the
60,000 ocean going cargo ships transporting global goods, the most promising
technology, says Christensen, is either hydrogen or synthetic fuels.
Making these fuels available sustains the globalization the world depends on for just about everything. In The Age of Aquarius, renewable fuels keep ships rolling on the high seas as we transition from grey to green. Check it out!
I didn’t realize that natural gas is mostly methane
which is about 84 times worse for climate change compared to CO2.
As reported in the recently published study “Methane and NOx Emissions from Natural Gas Stoves, Cooktops, and Ovens in Residential Homes,” methane leaks are bad news for both environmental and personal health. (Lebel, et al, Environ. Sci. Technol. 2022, 56, 4, 2529–2539)
The abstract in the Lebel
article states:
Natural gas stoves in >40 million U.S.
residences release methane (CH4) ─a potent greenhouse gas, through
post-meter leaks and incomplete combustion.
Using
a 20-year timeframe for methane, annual methane emissions from all gas stoves
in U.S. homes have a climate impact comparable to the annual carbon dioxide
emissions of 500,000 cars.
In addition to methane emissions, co-emitted
health-damaging air pollutants such as nitrogen oxides (NOx)
are released into home air and can trigger respiratory diseases.
Our data suggest that families who don’t use
their range hoods or who have poor ventilation can surpass the one hour
national standard of NO2 (100 ppb) within a few minutes of
stove usage, particularly in smaller kitchens.
http://aprovecho.org/wp-content/uploads/2022/03/3.17.22-greenhousegas.png460412Kim Stillhttp://aprovecho.org/wp-content/uploads/2015/11/Aprovecho-Logo.pngKim Still2022-03-17 17:16:392022-03-17 17:47:33Climate Change: Replacing Natural Gas and Coal Burning in the USA
