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   Excess ventilation  evaluated  
Due to internal or external heat sources (passengers, lights, electrical equipment, sunshine through the windows) temperature inside coaches may rise beyond 20° C even for much lower outside temperatures. In this case the coach may be cooled by outside air through an excessive operation of ventilation. This saves energy for air-conditioning.
Technology field: Optimisation of comfort functions
open main section General information
open main section General criteria
close main section Environmental criteria
  close sub-section Impacts on energy efficiency:
  Energy efficiency potential for single vehicle: < 2%
  Energy efficiency potential throughout fleet: < 1%
   

Energy savings result from the net effects of saved climatisation energy and higher energy demand of ventilation motors.

No quantitative data on energy savings realised is available.

The following calculation gives a rough estimate of the saving potential:

  • 20% of the total energy demand of a passenger train is due to comfort functions (mainly air-conditioning).
  • According to a rough estimate by a DB expert, cooling to make up for interior heat sources amounts to about one third of energy for air-conditioning.
  • Conditions for excessive ventilation (occupancy, sunlight, outside temperature) are only given in a certain time portion (presumably < 50%) of operation.
  • Excessive ventilation alone will in many cases not be sufficient to reach target temperature.

Taking these limitations into account, excessive ventilation will save < 2% of overall energy.
  Other environmental impacts: neutral
    (no details available)
open main section Economic criteria
no data available Application outside railway sector (this technology is railway specific)
open main section Overall rating
References / Links:
Attachments:
Related projects:  Energy Management System of New Coaches
Contact persons:
 date created: 2002-10-09
 
 
© UIC - International Union of Railways 2003
 
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