4 ms·

Primary energy consumption is not relevant. What matters is the useful part and not the wasted part (released as mostly unwanted heat) in the transition to ren

by guerby 5y ago

Primary energy consumption is not relevant. What matters is the useful part and not the wasted part (released as mostly unwanted heat) in the transition to renewable. For example electric cars uses one quarter of the energy of a fossil car for the same service (moving around). Heat pump use one third or less of the energy to heat up water or air vs burning fossil fuels. Etc...

eldaisfish 5y ago
>Primary energy consumption is not relevant. Are you sure? Transport alone consumes around 40% of oil output. Replacing even a chunk of that with electric vehicles will cause electric demand to skyrocket. You'll be able to power around three to four times as many cars with the same amount of energy but primary energy is absolutely relevant because that energy is currently coming from oil. >Heat pump use one third or less of the energy to heat up water or air vs burning fossil fuels. Are you sure? My Furnace is 95% efficient and burns natural gas. My water heater is 75% efficient and also burns natural gas. Both devices are middle of the road and much more efficient options are available.
- KptMarchewa 5y ago
  >You'll be able to power around three to four times as many cars with the same amount of energy Even more than that, since charging EVs usually happens at night. And it's pretty easy to incentive EV users to do that.
- ben_w 5y ago
  Heat pumps use energy you would otherwise not, so can look like >100% efficient: https://help.leonardo-energy.org/hc/en-us/articles/203047881-How-efficient-is-a-heat-pump- https://help.leonardo-energy.org/hc/en-us/articles/203047881... Thermodynamically speaking this is an accounting trick, much like counting the cost of opening a curtain as an alternative to the energy cost of a lightbulb. But it’s a useful measure for consumers.

4 ms·

Primary energy consumption is not relevant. What matters is the useful part and not the wasted part (released as mostly unwanted heat) in the transition to ren

by guerby 5y ago

eldaisfish 5y ago
>Primary energy consumption is not relevant. Are you sure? Transport alone consumes around 40% of oil output. Replacing even a chunk of that with electric vehicles will cause electric demand to skyrocket. You'll be able to power around three to four times as many cars with the same amount of energy but primary energy is absolutely relevant because that energy is currently coming from oil. >Heat pump use one third or less of the energy to heat up water or air vs burning fossil fuels. Are you sure? My Furnace is 95% efficient and burns natural gas. My water heater is 75% efficient and also burns natural gas. Both devices are middle of the road and much more efficient options are available.
- KptMarchewa 5y ago
  >You'll be able to power around three to four times as many cars with the same amount of energy Even more than that, since charging EVs usually happens at night. And it's pretty easy to incentive EV users to do that.
- ben_w 5y ago
  Heat pumps use energy you would otherwise not, so can look like >100% efficient: https://help.leonardo-energy.org/hc/en-us/articles/203047881-How-efficient-is-a-heat-pump- https://help.leonardo-energy.org/hc/en-us/articles/203047881... Thermodynamically speaking this is an accounting trick, much like counting the cost of opening a curtain as an alternative to the energy cost of a lightbulb. But it’s a useful measure for consumers.