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   CO2-based demand control for coach ventilation  evaluated  
The ventilation of confined spaces can be controlled according to demand by using CO2-concentration as an indicator for occupancy. This concept can be applied to railway passenger coaches and saves energy since less outside air has to be heated or cooled to inside temperature.
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: 5 - 10 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 - 5%
  Energy efficiency potential throughout fleet: 1 - 2%
  Other environmental impacts: neutral
close main section Economic criteria
  open sub-section Vehicle - fix costs: medium
  Vehicle - running costs: significant reduction
  Infrastructure - fix costs: none
  Infrastructure - running costs: unchanged
  Scale effects: medium
  Amortisation: (no data)
close main section Application outside railway sector
  open sub-section Status of development outside railway sector: test series
  Time horizon for broad application outside railway sector: in 5 - 10 years
  Expected technological development outside railway sector: basically exploited
  Market potential outside railway sector: small
close main section Overall rating
  open sub-section Overall potential: very promising
  Time horizon: mid-term
References / Links:  Brunner, Gartner 1999;  Dongen, Fiechter 2000;  Emmerich, Persily 1997
Attachments:
Related projects:  CO2-controlled ventilation;  Savings on Coaches, Type Bpm
Contact persons:
 date created: 2002-10-09
 
 
© UIC - International Union of Railways 2003
 
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