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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
close main section General information
  open sub-section Description
close main section General criteria
  open sub-section Status of development: in use
  Time horizon for broad application: 2 - 5 years
  Expected technological development: basically exploited
  Benefits (other than environmental): none
  Barriers: medium
  Applicability for railway segments: high
    Type of traction:  electric - DC, electric - AC, diesel
    Type of transportation:  passenger - main lines, passenger - high speed, passenger - regional lines, passenger - suburban lines
    Grade of diffusion into railway markets:
  Diffusion into relevant segment of fleet: < 5%
  Share of newly purchased stock: < 20%
  Market potential (railways): high
close main section Environmental criteria
  open sub-section Impacts on energy efficiency:
  Energy efficiency potential for single vehicle: < 2%
  Energy efficiency potential throughout fleet: < 1%
  Other environmental impacts: neutral
close main section Economic criteria
  open sub-section Vehicle - fix costs: low
  Vehicle - running costs: minor reduction
  Infrastructure - fix costs: none
  Infrastructure - running costs: unchanged
  Scale effects: not applicable
  Amortisation: (no data)
no data available Application outside railway sector (this technology is railway specific)
close main section Overall rating
  open sub-section Overall potential: promising
  Time horizon: short-term
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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