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Brian Siana Profile picture
Brian Siana
@briansiana
Astronomer @astroucr, Professor and Associate Faculty Director of Sustainability @UCRiverside. Ask me about my heat pump.
Aug 3, 2022 • 15 tweets • 4 min read
I modeled my electric vehicle (Hyundai Kona Electric) efficiency as a function of velocity. There's some interesting insight in here about the efficiencies of electric vehicles. I hope you enjoy this🧵as much as I did! First, units! I prefer having the unit of energy in the numerator (kWh/mile), but the US seems to be quickly adopting mile/kWh similar to its fossil cousin: mpg. One nice thing about kWh/mile is that it's energy/distance. In other words, it's a force!
Dec 13, 2019 • 11 tweets • 7 min read
Question: What is the thing in your household that almost certainly uses the most power when in use?

Answer: Your shower! It's using energy at a rate of ~15 kW and uses a total of about 2 kWh of energy. I've assumed 2.3 gallons minute flow rate, 8 minute shower, and a 25 C (45 F) temperature increase from the cold-water tap. In some colder climates with deep well water, I suspect the tap is colder than the 60 F tap water that I've assumed here. So power is even higher there.