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CO2-based demand control for coach ventilation |
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evaluated |
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| 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.
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Technology field: Optimisation of comfort functions
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General information
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General criteria
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Environmental criteria
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Economic criteria
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Vehicle - fix costs: medium |
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For retrofit measure: Due to pronounced differences between air-conditioning technology of rail vehicles, no general figure can be given. The following figure may give an idea: Retrofit measure for demand-operated ventilation of SBB B 20-73 coach in Switzerland caused additional costs of about 14.000 EUROs. However, this is the cost for a dedicated solution realised on one single coach. This figure could be substantially reduced if a larger number of vehicles is refitted. |
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Vehicle - running costs: significant reduction |
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Reduced energy costs (cf. Energy efficiency potential) |
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Infrastructure - fix costs: none |
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(no details available) |
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Infrastructure - running costs: unchanged |
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(no details available) |
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Scale effects: medium |
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Installation in new stock: some scale effects are to be expected both for CO2 sensors and in railway industry if the application becomes a standard in railway coaches.
Retrofit: Some minor scale effects may come from dropping prices of sensor equipment. Due to the heterogeneity of stock, the retrofit measure will be specific to some extent for every vehicle series. Scale effects are therefore to be expected if large series of the same vehicle type are refitted. |
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Amortisation: (no data) |
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Amortisation is difficult to assess in a general manner. In new stock, the additional cost for CO2-operated ventilation will usually pay off in a short period of time. Reftrofit measures are often costly and profitability is not always favourable but can be raised by including the feature in a bundle of measures (cf. the refitting of B 20-73 at SBB). |
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Application outside railway sector
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Overall rating
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 date created: 2002-10-09 |
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| © UIC - International Union of Railways 2003 |
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