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Zero Net Energy - March 24, 2021

by gmoke Thu Mar 25th, 2021 at 02:26:37 AM EST

Making a wooden solar insolation visualization
www.makingdatatangible.com/solar - program to help you make your own
https:/pysolar.readthedocs.io/en/latest - a collection of Python libraries for simulating the irradiation of any point on earth by the sun
Editorial Comment:  possibly a useful tool for those thinking about solar in relation to zero net energy

District heating in Sweden

World's largest PassivHaus-certified office building

Saudi Arabia to build a zero emissions city

Sustainable Housing Ownership Project, Thunder Valley Community Development Corporation

Gothenburg, Sweden is developing the world's first large-scale zero-emissions city zone
news.cision.com/business-region-goteborg/r/gothenburg-green-city-zone-leads-the-way-towards- zero-emissions-transportation-in-the-near-future,c3266333
https:/cleantechnica.com/2021/01/19/gothenburg-partners-with-volvo-to-create-a-climate-neutral-city /

Ohlone College - 185,000-square-foot net zero energy development
https:/www.cannondesign.com/our-work/work/ohlone-community-college-district-academic-core-buildings /

UK prefab low energy homes coming to scale?  An estimated 30,000 in the pipeline
www.theguardian.com/artanddesign/2021/mar/06/eco-homes-become-hot-property-in-uks-zero-carbo n-paradigm-shift
Leeds Climate Innovation District

Deep Energy Retrofit for Triple Deckers

Oregon State University goes for net zero in new building

ML King Open/Cambridge Street Upper School in Cambridge, MA achieves net zero emissions

Net zero home development with 3D printed components

Years of Zero Net Energy links at http://solarray.blogspot.com

The article about triple-deckers suggests the scale of the problem.

They have gone into a few old buildings, gutted them, replaced all of the mechanical systems, and made them into practically modern buildings. I have lived in Worcester; most of the triple deckers there were built between 1880 and 1920 and are in bad condition. They need a LOT of work to bring up to modern standards.

But the cost numbers do not come close to working out. And the number of such buildings that would need to be retrofitted is huge. And when you're done, you are still not close to zero net energy with gas furnaces in the basements.

I recently obtained an estimate to replace the conventional HVAC system in my small house with a heat pump, it came to $30,000. That is far beyond the financial reach of almost all of the property owners in the neighborhood. The payoff time at current utility rates approaches a century.

The scale of the problem is still not internalized.

by asdf on Thu Mar 25th, 2021 at 10:15:41 PM EST
Energiesprong (https://energiesprong.org) has developed a pre-fab system for retrofitting old buildings to near net zero.  They've been working for the last few years in the EU with success and have begun working in NY state recently.  My understanding is that the wider variety of building styles in the USA has given them some difficulties and the program has not been as successful as expected but they are still working on it.

Jimmy Carter's 1979 energy plan called for insulating 90% of our homes to higher standards by 1986 so at one point we had the ambition, or at least Carter did.  The earliest Green New Deal legislation called for making all public housing net zero energy within 10 years, at least in the draft I read.

Solar IS Civil Defense

by gmoke on Fri Mar 26th, 2021 at 06:43:24 PM EST
[ Parent ]
Bill Gates is pretty clear on the "zero" requirement in his new book
by asdf on Mon Mar 29th, 2021 at 08:13:48 PM EST
Good for him.  Now he should find out how Scotland has produced something like 97% of its energy from renewables without coal or nuclear and reportedly rarely used gas peaker plants so he can quit it with that nuclear hobbyhorse and "renewables can produce only 80% of our energy" jazz.

Solar IS Civil Defense
by gmoke on Tue Mar 30th, 2021 at 07:41:53 PM EST
[ Parent ]
About a year ago I had my detached garage wired with a 50 amp outlet to support my future electric car purchase.

Now, having thought about it for a year, it seems likely that I will not bother to buy an electric car. The closest I can get to a net zero energy transportation system (other than taking the bus that stops a block from my house) is to buy a second-hand hybrid. It's already been built, it uses a small amount of gasoline, and is a lot cheaper.

(Reality is that I plan to keep my existing hybrid for another decade.)

That raises the question of how to convince people to replace their existing vehicles with EVs. If you take an EV price of $30,000 and compare it to a used hybrid price of say $5000, it would take a $25,000 state subsidy to even out the purchase price.

by asdf on Mon Apr 5th, 2021 at 07:57:28 PM EST

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