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Calculations show, that the conversion from nuclear and fossil energy sources to renewables needs a storage capacity of 10TWh, which is 300 times the existing capacity of pumped hydro power in Germany. A new technology to overcome the limitations of large land usage is the hydraulic hydro storage system, which uses a huge rock mass to store potential energy. This cylindrical rock mass is cut out of the natural ground using mining technologies. The system is sealed and water is pumped below the cylinder, using excess energy from solar and wind power systems. During times of energy scarcity, the pressurized water is turbinated to generate electricity. The storage capacity grows with the fourth power of the system radius.
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Hydraulic Hydro Storage System
Prof. Dr. rer. nat. Eduard Heindl Furtwangen University
hmax=r
o Water is pumped into a subsurface cavity, using cheap electrical powero The rock cylinder is lifted by hydraulic forceso The storage is discharged when the energy price is high, using a power converter
power grid r
2r
E~r4
Operation Principle
capacitypower converter
connect
Hydraulic Hydro Storage System
E = 2 π g ρ * r4h=r
l=2r
rmass ~ r³maximum heigth ~ r
storage capacity:
surface ~ cost ~ r²
cost per kWh capacity ~ 1/r²advantage
Hydraulic Hydro Storage System
Physical Properties
Construction
1km
mine shaft
base tunnel, water intake
1. tunnel
2r
construction road
2. tunnel
Hydraulic Hydro Storage System
mined space
exca-vator
excavatedmaterial
side view
waterproofing
waterproofing
2. tunnelbase-tunnel
base plate seperationHydraulic Hydro Storage System
base plate seperation
base-tunnel
2. tunnel
rock
excavatedmaterial
top view!
exca-vator
cutted rock
Hydraulic Hydro Storage System
base plate seperationbase plate seperatedzylinder is monted on a ballast bed
side view
waterproofing
waterproofing
2. tunnelbase-tunnel excavatedmaterial
Hydraulic Hydro Storage System
Drillingdrilling guide holes for the wire saw
Hydraulic Hydro Storage System
Diamond wire sawingsurface
1. tunnel
traction
Diamond wire saw
rock
drilling holes
r
cut surface
side view
Hydraulic Hydro Storage System
rock mass
Due to rock mechanics, it is neccessary to cut a V-shaped trench
sawing string
utility tunnel
side view
utility tunnel
boulder
Hydraulic Hydro Storage System
rock mass
trench will get smaler due to rock pressure
every surface is sealed using geomembrane
utility tunnel
side view
utility tunnel
geo-membrane
Hydraulic Hydro Storage System
Sealing and Securing
metal
sealing ring
Sealing to keep rock dry
floating piston
cylinder capacity filled with water
rock securing
Hydraulic Hydro Storage System
Sealing O-ring
rock mass
piston
pin joint with sensor
seal
steel
podest
water pressure
steel coversteel cover
Hydraulic Hydro Storage System
Setup: multi O-ring sealing
piston
podest
v
v
v
rock
pressure: 10 Bar per O-ringpressure: 10 Bar per O-ring
Hydraulic Hydro Storage System
Safety
blocking in case of high
flow2. backup
sealing ring
floating piston
cylinder capacity filled with water
1. backupsealing ring
self inflating in case of
water contact
There should be systems, that stop a leakage by physical means
Hydraulic Hydro Storage System
tunnel10.000
€/m 73 Mio. €
drilling
500 €/m 157 Mio. €
wire saw 10 €/m² 63 Mio. €
overburden 20 €/m³ 126 Mio. €
base seperation 1.000 €/m² 785 Mio. €
seal (stainless steel) 200 €/m² 157 Mio. €
seal geomembrane 100 €/m² 393 Mio. €
O-ring10.000
€/m 31 Mio. €
Summe 1.785 Mio. €
Investment for r=500 m HHSHydraulic Hydro Storage System
Radius [m] 62,5 125 250 500
storage capacity [GWh] 0,5 7 100 1600
pressure [Bar] 25 50 100 200
Investment² [Mio. €]
40
112
400
1800
Investment per kWh [€]
80
16
4
1
value of one loaded system 100€/MWh [Mio.€]
0,05
0,800
12
200
ROI [# of cycles] 800 140 33 9
Technical and Financial Data*
*figures rounded²invest does not include pumping system
Hydraulic Hydro Storage System
Advantage storage capacity beyond 1000 GWh visibleefficiency: 80% known valueno resource problemno mountains neccessaryno enviromental problems, because no chemicals neededonly small footprint (up to 2 MWh/m²)less water consumption than PHS (~1/4)known technologiesprice drops with 1/r²
Hydraulic Hydro Storage System
Thank you!
www.Hydraulic-Hydro-Storage.com
Hydraulic Hydro Storage System
contact
Furtwangen UniversityProf. Dr. Eduard HeindlRobert Gerwig Platz 1
78120 FurtwangenGermany
+49 177 [email protected]
www.hydraulic-hydro-storage.com
Hydraulic Hydro Storage System
