How many building owners would give up that much space?
West-Abalone-171 on
Why does this keep happening? How could it possibly pass peer review?
A residential highrise with ~3m floors costs **at least** $2000/m^2 to construct.
At 200m (a very tall highrise in most places) you’re storing **at most** iron ore at 5000kg/m^3
So the **maximum energy** is 200m x 5000kg/m^3 x 9.8m/s^2 = 30MJ or 9kWh/m^2
A typical highrise is 200-600kg/m^3
So the block weighs 0.5-1.2x the mass of the entire building **all at the top floor**
So the cost of the place to put the block in the **best case scenario,** completely ignoring that the block doubles the mass of the building (and more than double the structural components) is **at least** $220/kWh because this is the minimum cost for that floor space (and it’s the most desirable and expensive to support floor space so this is a huge underestimate of costs).
There are batteries on the market today at half the price.
We haven’t considered a single cent from the actual storage system or the massive added structural costs and the budget is gone twice over.
Moreover if the entirety of a floor is dedicated to a weight, it is being shared by 55 stories below it. If they represent 100m^2 of floor space each that’s an upper limit of 16kWh. Roughly 30 litre, 140kg battery.
2 Comments
How loud is it?
What are the maintenance costs?
How many building owners would give up that much space?
Why does this keep happening? How could it possibly pass peer review?
A residential highrise with ~3m floors costs **at least** $2000/m^2 to construct.
At 200m (a very tall highrise in most places) you’re storing **at most** iron ore at 5000kg/m^3
So the **maximum energy** is 200m x 5000kg/m^3 x 9.8m/s^2 = 30MJ or 9kWh/m^2
A typical highrise is 200-600kg/m^3
So the block weighs 0.5-1.2x the mass of the entire building **all at the top floor**
So the cost of the place to put the block in the **best case scenario,** completely ignoring that the block doubles the mass of the building (and more than double the structural components) is **at least** $220/kWh because this is the minimum cost for that floor space (and it’s the most desirable and expensive to support floor space so this is a huge underestimate of costs).
There are batteries on the market today at half the price.
We haven’t considered a single cent from the actual storage system or the massive added structural costs and the budget is gone twice over.
Moreover if the entirety of a floor is dedicated to a weight, it is being shared by 55 stories below it. If they represent 100m^2 of floor space each that’s an upper limit of 16kWh. Roughly 30 litre, 140kg battery.