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General information
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Description
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Conversion losses of traction equipment of an electric traction unit show up as heat that must be removed from the system continuously to prevent over-heating. This is done by the coolers that in many locomotives are realised as mechanical ventilators.
Although at peak load the power required for cooling is almost negligible, it is not at low load (cf. Figure 1). This share can be substantially reduced by demand-controlled operation, i.e. by controlling ventilation power (e.g. the speed of the mechanical fans) according to actual cooling demand of the motor (or other traction equipment).
While most modern locomotives and some EMUs are equipped with demand-controlled ventilation, the technology does not seem to be a standard in new stock.
Old stock can in some cases be equipped with demand-operated ventilation as a retrofit. |
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General criteria
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Status of development: in use |
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Time horizon for broad application: now |
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Expected technological development: basically exploited |
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Benefits (other than environmental): medium |
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Barriers: medium |
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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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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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Market potential (railways): high |
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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 |
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Demand-operated ventilation is a feature of many but not all modern electric vehicles. In MU stock the main obstacle is additional cost and complexity due to the required separate auxiliary inverter. However, LCC are likely to be in favour of demand-operated ventilation even in MUs. |
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date created: 2002-10-09
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