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Tom Moyer 🇺🇸 Profile picture
Tom Moyer 🇺🇸
@TomMoyerUT
Climate solutions hawk. Decency & integrity over partisanship. #PrinciplesFirst. Utah Citizens’ Climate Lobby. EOD robotics engineer & former science educator.
Apr 15, 2022 • 7 tweets • 2 min read
Carbon dioxide removal has been in the news lately with the $925M announcement from Stripe and Frontier.

There's been lots of discussion about the energy requirements for direct air capture, and thermodynamic limits. So I decided to check the numbers.
A 🧵 The Climeworks process uses 10.8 GJ of energy per ton of CO2 captured. Interestingly - most of that is heat, to release the CO2 from the capture material. Since they're in Iceland they get heat for free. For each ton they need 9 GJ (2.5 MWh) of heat and 0.5 MWh of electricity. 2/
Jan 28, 2022 • 12 tweets • 7 min read
I've got some heat pump #EnergyTwitter data to share. I monitor the electrical usage of my heat pump, but I haven't been able to measure the amount of heat it's producing, which means I haven't known how efficient it is.
It turns out that I was running it really badly. A 🧵 I've had the fan set to "auto" and a "set it and forget it" thermostat program. That's the usual advice to keep the heat pump running in the middle of its range.

The dots are 20-minute snapshots in time, with the heat pump running more or less steady state. 2/
Oct 3, 2021 • 16 tweets • 6 min read
We traveled down to Price, UT today to talk about economic development in coal county with Mayor Mike Kourianos. Mike told me that the best way we can help is to talk about what they’re doing, so here goes a 🧵 Besides being mayor, Mike is a supervisor at the coal plant, working 12-hour shifts. (I don’t know when he sleeps.) His dad was a miner and didn’t want him taking that path. Mike is working to build a thriving community that’ll still be here after the coming energy transition. 2/
Aug 17, 2020 • 13 tweets • 7 min read
Time to write up something I’ve been meaning to get to for a while. This is my family’s carbon footprint for last year. 2020 is going to look great because we’re not flying and we’re barely driving, but what’s shown is more typical.
A thread, with thoughts on how we get to zero. I’m not interested in arguing about individual action vs. systemic change. We can’t get there with individual action alone. That’s why I volunteer with @citizensclimate. But I think those of us who want to see a zero-emissions economy need to show what that would look like.
2/
Feb 14, 2020 • 15 tweets • 16 min read
After this thread about how to build a net-zero house, I was asked to do one on the cost / benefit of energy efficiency work. I’ve got good data on this from our project, so here goes. Caution – nerd thread ahead.
cc: @energysmartohio @EfficiencyLast @EsTresidder @energysmartohio @EfficiencyLast @EsTresidder 2/ The point of energy efficiency work is to cut energy use, which results in lower energy costs. If it doesn't, then you're not helping the environment or your wallet.
The discussion about cost effectiveness has been going on in this good thread.
Jan 5, 2020 • 28 tweets • 30 min read
Time for a THREAD about the details of our all-electric net-zero house.

Credit to @BrachDesignArch, Russell & Co Construction, and @CEsolar_com
cc: @energysmartohio and @Guay_JG

This thread is posted as a pdf at tinyurl.com/w2439yr @BrachDesignArch @CEsolar_com @energysmartohio @Guay_JG Our annual generation covers everything the house uses plus one EV, with enough surplus for an additional 1,200 mi/yr of EV driving.

Gas service is on the property, but we didn’t run it to the house.