4 ms·
So...what is that in Megawatt-hours?
by leggomylibro 9y ago
So...what is that in Megawatt-hours?
- robotresearcher 9y agoLifted rock is 3X whatever the number for lifted water is. The KWH is proportional to how much was lifted and (approximately) how high it was lifted.
- oh_sigh 9y agopotential energy = HAM = Height * Acceleration(due to gravity) * Mass. Height = 250m Acceleration(on earth) = 9.8 m/s/s Mass = pi * r^2 * h = pi * 125m * 125m * 500m * 3 g/cm^3 = 7.36e13 HAM = 250 * 9.8 * 7.36e13 = 1.8e17
- splittingTimes 9y agoCompared to the potential energy of lifted water mass in a dam, isn't the water also highly pressurized under that rock mass? Would that not need to be taken into account as well?
- semi-extrinsic 9y agoWater is very incompressible, so you don't really get anything in addition to the potential energy. If you decompress water from 300 bar (equivalent to 1 kilometer height of rock above it) to 1 bar (atmospheric pressure) it only expands by 1.5%.