 |
|
|
|
|
|
|
 |
General information
|
|
|
|
|
|
|
| |
 |
|
|
Description
|
|
|
General criteria
|
|
|
Environmental criteria
|
|
|
|
|
|
|
| |
|
|
|
Impacts on energy efficiency:
|
| |
 |
|
|
Energy efficiency potential for single vehicle: > 10% |
| |
|
|
|
Energy efficiency potential throughout fleet: (no data) |
| |
|
|
|
|
Depends on application context.
Cf. Stationary energy storage in DC systems, Diesel-electric vehicles with energy storage and On-board energy storage in DC systems. |
|
|
|
|
| |
|
|
|
Other environmental impacts: neutral |
| |
|
|
|
|
(no details available) |
|
|
Economic criteria
|
|
|
|
|
|
|
| |
|
|
|
Vehicle - fix costs: high |
|
|
|
|
| |
|
|
|
Vehicle - running costs: significant reduction |
|
|
|
|
| |
|
|
|
Infrastructure - fix costs: none |
|
|
|
|
| |
|
|
|
Infrastructure - running costs: unchanged |
|
|
|
|
| |
|
|
|
Scale effects: low |
|
|
|
|
| |
|
|
|
Amortisation: > 5 years |
|
|
Application outside railway sector
|
|
|
|
|
|
|
| |
|
|
|
Status of development outside railway sector: in use |
| |
|
|
|
|
Since 1988, small fly-wheel systems (2 kWh, 150 kW) have been in use in electric busses for urban transport in several European cities. Fly-wheels made by the Magnetmotor GmbH have been in use in diesel-electric city buses since 1988. Since 1992, 12 trolley buses with fly-wheels have been running in Basel, Switzerland, with a total of more than 200.000 operating hours. |
|
|
|
|
| |
|
|
|
Time horizon for broad application outside railway sector: in 5 - 10 years |
| |
|
|
|
|
(no details available) |
|
|
|
|
| |
|
|
|
Expected technological development outside railway sector: highly dynamic |
| |
|
|
|
|
Energy densities of current fly-wheels attain 20 kWh/m3. Experts claim that a 5-fold increase of this figure is possible.
The use of superconductors instead of conventional magnets for the bearing of the fly-wheel would lead to a further reduction of losses. |
|
|
|
|
| |
|
|
|
Market potential outside railway sector: small |
| |
|
|
|
|
Since an application of fly-wheels in private cars is highly doubtful, there is no mass market for fly-wheel technology in the foreseeable future. The main market is diesel-electric busses and city rail systems. This means that demand will no exceed a few hundred fly-wheel systems. |
|
|
Overall rating
|
|
|
|
|
|
|
| |
|
|
|
Overall potential: promising |
| |
|
|
|
Time horizon: long-term |
| |
|
|
|
|
Fly-wheel technology is a promising solution for energy storage systems. First in-service experience from trolley busses and stationary storage in a light city rail DC system show principal technological feasibility and reliability. High power fly-wheels for on-board storage in DMUs are still under development. Main barriers for fly-wheels are high initial investment and long payback times. Best cost-benefit ratio is reached for stationary storage systems in local DC systems. Scale effects will be small in the foreseeable future since no mass markets exist. Growing technological competition from double-layer capacitors make a wide-spread use of fly-wheel technology uncertain. Nevertheless, due to long life-time and relatively high maturity, fly-wheels are still a promising technology. |
Technologies
go back to technology list
previous technology 
date created: 2002-10-09
add technology
show overview
show evaluation
show details
print data sheet
print screen
Evaluation briefing
Technology list