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	Introduction     Database      Technologies    Projects     Calendar     Discussions     Contact & Links     Imprint & Disclaimer     Sitemap	go back to technology list       previous technology  next technology     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 General information   Description General criteria   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 Environmental criteria   Impacts on energy efficiency:   Energy efficiency potential for single vehicle: 2 - 5%   Energy efficiency potential throughout fleet: 1 - 2%   Other environmental impacts: neutral Economic criteria   Vehicle - fix costs: medium   Vehicle - running costs: significant reduction   Infrastructure - fix costs: none   Infrastructure - running costs: unchanged   Scale effects: medium   Amortisation: (no data) Application outside railway sector   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 Overall rating   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			Your contribution    add technology  Views of this page    show overview    show evaluation    show details  Print options    print data sheet    print screen  Help    Evaluation briefing    Technology list     French - German