Re: Bloques de hormigón como sistema de almacenamiento de electricidad

Posted by Fleischman on Ago 31, 2018; 12:58pm
URL: http://foro-crashoil.109.s1.nabble.com/Bloques-de-hormigon-como-sistema-de-almacenamiento-de-electricidad-tp46977p47048.html

Cualquier cosa que se nos ocurra ya se le ha ocurrido antes a alguien...

En el mismo post de Tom Murphy (http://physics.ucsd.edu/do-the-math/2011/09/got-storage-how-hard-can-it-be/) habla de los volantes de inercia y el aire comprimido, entre otros.

A recent $53 million flywheel storage facility in Pennsylvania uses 200 large units storing 25 kWh each, working out to $10,000 per kWh of storage capacity. Each unit’s vacuum chamber looks to be about 1.5 m in diameter and 3–4 m tall. If we raise the ceiling and squeeze four into our bedroom, we could get 3 days of electricity storage for the typical American house for a cool million bucks. But the frictional losses—while painstakingly minimized—likely preclude these units from being useful over periods of days.

(...)

A high-quality tank can store air at 200 atmospheres of pressure. If we make a big bedroom-sized tank in cylindrical form similar to the flywheel dimensions, it has a volume of 10 m³. The steel walls would have to be about 6 cm thick to withstand the stress, so that the tank would have a mass of approximately 12 tons.  You did reinforce the floor, right?

We want to take a volume of air, V0, 200 times larger than our tank volume at atmospheric pressure (P0 = 105 Pa) and compress it to fit in the tank (adding two tons of mass!). If done slowly enough to maintain approximately constant temperature (several hours), the energy required is P0V0ln(P/P0), where ln() is the natural logarithm function. For our volume, this turns into 1 GJ, or almost 300 kWh—enough for 10 days of typical American electricity use.