Technologies - Ventilation control (in new stock)

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Ventilation control (in new stock)

evaluated

Traction equipment is cooled by ventilation to prevent over-heating. The energy needed for ventilation 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). The technology is wide-spread but not a standard yet.

Technology field: Optimisation of traction technologies



General information

General criteria

	Status of development: in use
		In locomotives, demand-controlled ventilation is becoming a standard (including high speed trains, such as TGV).

	Time horizon for broad application: now
		(no details available)

	Expected technological development: basically exploited
		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.

	Motivation:
		Energy saving Noise reduction in stations

	Benefits (other than environmental): medium
		Noise reduction When leaving a station, coolers make a high contribution to train noise. This can be substantially reduced by demand-control.

	Barriers: medium
		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.

	Success factors:
		Integrate demand-operated ventilation in specification sheet for locomotives. Integrate separate account for auxiliaries' consumption into energy efficiency specification given by manufacturers

	Applicability for railway segments: (no data)
	Type of traction: electric - DC, electric - AC, diesel
	Type of transportation: passenger - main lines, passenger - high speed, passenger - regional lines, passenger - suburban lines, freight
		(no details available)

	Grade of diffusion into railway markets:
	Diffusion into relevant segment of fleet: (no data)
	Share of newly purchased stock: (no data)
		(no details available)

	Market potential (railways): high
		(no details available)

	Example:
		(no details available)

Environmental criteria

Economic criteria

Application outside railway sector (this technology is railway specific)

Overall rating