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General information
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Description
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General criteria
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Status of development: in use |
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In locomotives, demand-controlled ventilation is becoming a standard (including high speed trains, such as TGV). |
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Time horizon for broad application: now |
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(no details available) |
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Expected technological development: basically exploited |
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The main barrier for a wide-spread use of demand-controlled ventilation in EMUs lies in the fact that a demand-control would mean variability of the whole board-supply including other equipment such as batteries etc.
There could be minor technological potential for solving this problem. |
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Motivation:
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- Energy saving
- Noise reduction in stations
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Benefits (other than environmental): medium |
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Noise reduction
When leaving a station, coolers make a high contribution to train noise. This
can be substantially reduced by demand-control. |
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Barriers: medium |
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Technological
Most coolers use (frequency-controlled) 3-phase motors. Their speed is
controlled by the frequency of the board energy supply. Other equipment
(batteries etc.) supplied by the on-board grid, would then be strongly affected
as well. In this case a demand-control of ventilation would require a separate
frequency-variable energy supply, which is raises costs and complexity. This is
especially a problem for EMUs having a very complex on-board grid. Even if
separate inverter equipment is needed, LCC are still in favour of
demand-operated ventilation. However, in most cases manufacturers will not
implement a measure that raises the price of the vehicle even if it reduces
LCC.
Vibrational issues
Variable frequencies due to demand-controlled fans may cause vibrational
problems (resonant behaviour of train components). This problem has been
resolved according to SNCF. |
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Success factors:
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- Integrate demand-operated ventilation in specification sheet for
locomotives.
- Integrate separate account for auxiliaries' consumption into energy
efficiency specification given by manufacturers
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Applicability for railway segments: (no data) |
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Type of traction: electric - DC, electric - AC, diesel
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Type of transportation: passenger - main lines, passenger - high speed, passenger - regional lines, passenger - suburban lines, freight
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(no details available) |
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Grade of diffusion into railway markets:
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Diffusion into relevant segment of fleet: (no data) |
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Share of newly purchased stock: (no data) |
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(no details available) |
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Market potential (railways): high |
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(no details available) |
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Example:
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(no details available) |
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Environmental criteria
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Impacts on energy efficiency:
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Energy efficiency potential for single vehicle: 2 - 5% |
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Energy efficiency potential throughout fleet: (no data) |
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Other environmental impacts: neutral |
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Economic criteria
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Vehicle - fix costs: (no data) |
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Vehicle - running costs: significant reduction |
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Infrastructure - fix costs: none |
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Infrastructure - running costs: unchanged |
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Scale effects: low |
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Amortisation: (no data) |
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Application outside railway sector (this technology is railway specific)
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Overall rating
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Overall potential: very promising |
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Time horizon: short-term |