Is the sand flowing or stationary?
Flowing sand has issues with blockages and erosion.
Stationary sand has pretty low conductivity, so getting all the energy out of your 200 yard cube of hot sand might be a challenge.
Flowing sand has issues with blockages and erosion.
Stationary sand has pretty low conductivity, so getting all the energy out of your 200 yard cube of hot sand might be a challenge.
You can progressively sink them in as the sand cools/ you want more energy out.