Re: Bloques de hormigón como sistema de almacenamiento de electricidad

Posted by Fleischman on Ago 27, 2018; 12:31pm
URL: http://foro-crashoil.109.s1.nabble.com/Bloques-de-hormigon-como-sistema-de-almacenamiento-de-electricidad-tp46977p46980.html

Mucho hormigón tienen que subir...

De Tom Murphy (do the math):

Gravitational Storage

Hydroelectric dams and pumped storage solutions rely on the gravitational energy stored in an elevated mass. What could we do in a home environment? Could we get much out of our personal pumped storage tank on-site?

Let’s start small by considering the 3 W-h of energy stored in a AA battery, as computed above. One kWh of energy is 3.6×106 J of energy, so our AA battery stores 10,800 J of energy. A mass of m kilograms, hoisted h meters high against gravity at g≈10 m/s² corresponds to E = mgh Joules of energy. If we were willing to hoist a mass 3 m high, how much mass would we need to replace the AA battery? Have a guess? The answer is 360 kg, or about 800 lb. A battery the size of your pinky finger beats the proverbial 800 lb gorilla lifted onto your roof!

The lesson is that gravitational storage is incredibly weak. A volume of water the size of our bedroom raised even 10 m above our home in a precarious threat to the neighbors would store 0.625 kWh. That’s enough for 30 minutes of typical household electricity consumption. You’ll forgive me if I ignore efficiency losses. It’s not even worth the effort. It’s over.