4 ms·
The power cycle used here is quite an interesting one. The heat from the compression cycle and cold from the expansion cycle are stored separately and re-used
by Mvandenbergh 6y ago
The power cycle used here is quite an interesting one.
The heat from the compression cycle and cold from the expansion cycle are stored separately and re-used which substantially increases storage efficiency.
Waste heat from co-located industrial plants is used to further boost expansion performance. A lot of "low grade" industrial heat is available but when you're re-heating from cryogenic temperatures, 100 C is actually high grade heat.
I suspect that the time over which it's efficient to store is limited by losses from the temperature stores.
- jhayward 6y ago> Waste heat from co-located industrial plants is used to further boost expansion performance. Let's not greenwash this. The "waste heat" is fossil fueled.
- Mvandenbergh 6y agoThat's not "greenwashing" because it's obvious. Thermal input in industrial processes is essentially all fossil fuel, high temperature input is 100% fossil fuel. To the extent that we need these processes, we may as well get as much bang for our CO2e buck as we can. Even if and when these processes can be driven using hydrogen combustion or other heat sources, there will still be low grade waste heat to use.
- jhayward 6y agoIt's greenwashing because it's not obvious, and the wording is deliberately deceptive. An accurate description would give readers the relevant facts, not assume they can figure out the hidden catch.