Air conditioning systems

Liebherr-Transportation Systems specializes in the development, design, test, production, supply and service of heating, ventilation and air conditioning systems (HVAC) for driver´s cab and the passenger saloons. These systems also include power supply, pressure protection, air ducts, diagnosis and control equipment. They are installed in high speed, inter-city, commuter, subway and urban rapid trains as well as in trams.

Liebherr’s air conditioning saloon unit for a train operated in the Greater Paris

Liebherr’s air conditioning saloon unit for a train operated in the Greater Paris "Ile de France" region

Liebherr-Transportation Systems offer conventional air conditioning systems with vapor cycle using traditional synthetic refrigerants. Liebherr also offers systems with CO2 as well as non-ozone depleting solutions where air is used as the cooling medium by means of an air cycle system. Liebherr’s air conditioning systems feature high output density, small mass and low weight, high reliability and availability as well as low energy consumption and noise emissions. They can be delivered either as compact modules or systems.

Liebherr’s air cycle air conditioning unit for the ICE 3.1

Liebherr’s air cycle air conditioning unit for the ICE 3.1

Liebherr is the only supplier in the industry who develops the air cycle machine in-house - thus being the expert in air cycle air conditioning.

Air cycle air conditioning systems work with air as cooling medium and are therefore totally environmentally benign.

Low lifecycle cost

The air cycle system is by far the air conditioning system that allows to reach the lowest life cycle cost (between 20 and 40 per cent lower than traditional technologies) when considering the rail vehicle’s total operation lifetime (more than 30 years).

Liebherr’s air cycle air conditioning system architecture

Liebherr’s air cycle air conditioning system architecture

Liebherr’s air cycle air conditioning system architecture

Open loop process

The systems operate either with an open loop or with a closed loop architecture. In any case they are based on the principle of expanding the air through a turbine to bring its temperature down.

In comparison with the closed systems that are now available on the market, the advantage of the open loop process is that in case of any minor air leakage which may develop in time, the system will continue to function with only a minor reduction in cooling efficiency. The heat exchange with the air supplied into the saloon continues independently and is separated from the air cooling process. The pen loop process offers the largest possible resistance to defects and the highest reliability with a smaller number of components.

Main components

Liebherr’s air cycle air conditioning systems consist of four main components only:

  • supply air fans for air movement,
  • a motorized air cycle machine/turbine (the process air is expanded here and therefore cooled),
  • a heat exchanger (the cooled air flows through it and is used to cool the warm outside air, the warm process air is compressed in the compressor and fed back to ambient),
  • an electric system that uses resistive heating elements to heat the cold outside air when required.

The system’s architecture is optimized for lowest internal pressure losses, light weight and high levels of efficiency.

Video - Air Cycle Technology

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Liebherr develops, tests, certifies, manufactures and services air cycle technology which has already proven its worth for many years in ICE-trains in Germany and a TER train from SNCF in Southern France.

Driver's cab vapor air conditioning unit

Driver's cab vapor air conditioning unit

Based on its long term experience, Liebherr offers vapor cycle air-conditioning systems for wide ranging applications – from high-speed trains to light rail vehicles, for both driver’s cabs and passengers’ saloons. Either compact units or split units, roof-mounted units or floor-mounted units, they provide the highest level of comfort and feature an optimized integration into the vehicle, together with a high output density and reduced weight and noise emissions.

The vapor cycle process is basically designed as a closed loop.

The intake of the cooled air into the saloon proceeds independently from the cooling process. Suitable devices for pressure protection in the intake of fresh and exhaust air provide high comfort to passengers and the train personnel even at high speeds.

CO 2 air conditioning system

CO2 air conditioning system

The CO2 air-conditioning system works according to the established evaporation cooling principle used in traditional air-conditioners.

It uses the natural CO2 gas as the cooling medium, which is environmentally friendlier and has a greenhouse effect 1,300 times less significant than traditional vapor cycle technologies.

CO2 does not damage the ozone layer and does not require reprocessing. It is not flammable under any conditions.

The outstanding feature of the CO2 air-conditioning system is that it is exceptionally suitable for being used as a heat pump. While operating in heating mode, this brings a substantial energy saving in comparison with traditional systems. Due to the thermodynamic properties of CO2 and the high energy density, very compact design solutions are made possible with the CO2 air-conditioning technologies.

Downloads

Green technology for railway vehicles

Liebherr has developed a 100% environmentally friendly system which does not contribute to the global warming of our planet.
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Liebherr has developed a 100% environmentally friendly system which does not contribute to the global warming of our planet. Play video
Liebherr has developed a 100% environmentally friendly system which does not contribute to the global warming of our planet.
We need your consent This YouTube video is provided by Google*. If you load the video, your data - including your IP address - is transmitted to Google and may be stored and processed by Google inter alia in the USA. We have no influence over further data processing by Google. By clicking on "Accept", you consent to the transmission of data to Google for this video in accordance with Art. 6 (1) (a) GDPR and at the same time expressly consent to the transfer of data to the USA in accordance with Art. 49 (1) (a) GDPR. If you no longer wish to consent to each YouTube video individually in the future and wish to be able to load the videos without this blocker, you can also select "Always accept YouTube" and thereby consent to the associated data transmissions and transfers to Google and to the USA for all other YouTube videos which you open on our website in the future. Please note that, in the opinion of the European Court of Justice, there does not currently exist an adequate level of data protection in line with EU standards in the USA, and at present we cannot provide suitable safeguards to protect your data and offset this shortcoming. Possible risks to you of data transfer to the USA are that access by state authorities cannot be excluded and that your data could be processed for reasons of national security, criminal prosecution or for other purposes in the public interest of the USA, possibly without you being informed separately and without enforceable rights and effective means of redress being available to you. You can withdraw consent that you have given at any time with future effect via the settings. For further information, please see our Data Protection Declaration and Google's Privacy Policy. *Google Ireland Limited, Gordon House, Barrow Street, Dublin 4, Irland; Mutterunternehmen: Google LLC, 1600 Amphitheatre Parkway, Mountain View, CA 94043, USA

Video - Liebherr HVAC sytems

Learn more about HVAC systems developed, manufactured and serviced by Liebherr-Transportation Systems in this animated clip.
We need your consent This YouTube video is provided by Google*. If you load the video, your data - including your IP address - is transmitted to Google and may be stored and processed by Google inter alia in the USA. We have no influence over further data processing by Google. By clicking on "Accept", you consent to the transmission of data to Google for this video in accordance with Art. 6 (1) (a) GDPR and at the same time expressly consent to the transfer of data to the USA in accordance with Art. 49 (1) (a) GDPR. If you no longer wish to consent to each YouTube video individually in the future and wish to be able to load the videos without this blocker, you can also select "Always accept YouTube" and thereby consent to the associated data transmissions and transfers to Google and to the USA for all other YouTube videos which you open on our website in the future. Please note that, in the opinion of the European Court of Justice, there does not currently exist an adequate level of data protection in line with EU standards in the USA, and at present we cannot provide suitable safeguards to protect your data and offset this shortcoming. Possible risks to you of data transfer to the USA are that access by state authorities cannot be excluded and that your data could be processed for reasons of national security, criminal prosecution or for other purposes in the public interest of the USA, possibly without you being informed separately and without enforceable rights and effective means of redress being available to you. You can withdraw consent that you have given at any time with future effect via the settings. For further information, please see our Data Protection Declaration and Google's Privacy Policy. *Google Ireland Limited, Gordon House, Barrow Street, Dublin 4, Irland; Mutterunternehmen: Google LLC, 1600 Amphitheatre Parkway, Mountain View, CA 94043, USA
Learn more about HVAC systems developed, manufactured and serviced by Liebherr-Transportation Systems in this animated clip. Play video
Learn more about HVAC systems developed, manufactured and serviced by Liebherr-Transportation Systems in this animated clip.
We need your consent This YouTube video is provided by Google*. If you load the video, your data - including your IP address - is transmitted to Google and may be stored and processed by Google inter alia in the USA. We have no influence over further data processing by Google. By clicking on "Accept", you consent to the transmission of data to Google for this video in accordance with Art. 6 (1) (a) GDPR and at the same time expressly consent to the transfer of data to the USA in accordance with Art. 49 (1) (a) GDPR. If you no longer wish to consent to each YouTube video individually in the future and wish to be able to load the videos without this blocker, you can also select "Always accept YouTube" and thereby consent to the associated data transmissions and transfers to Google and to the USA for all other YouTube videos which you open on our website in the future. Please note that, in the opinion of the European Court of Justice, there does not currently exist an adequate level of data protection in line with EU standards in the USA, and at present we cannot provide suitable safeguards to protect your data and offset this shortcoming. Possible risks to you of data transfer to the USA are that access by state authorities cannot be excluded and that your data could be processed for reasons of national security, criminal prosecution or for other purposes in the public interest of the USA, possibly without you being informed separately and without enforceable rights and effective means of redress being available to you. You can withdraw consent that you have given at any time with future effect via the settings. For further information, please see our Data Protection Declaration and Google's Privacy Policy. *Google Ireland Limited, Gordon House, Barrow Street, Dublin 4, Irland; Mutterunternehmen: Google LLC, 1600 Amphitheatre Parkway, Mountain View, CA 94043, USA

Contacts

Liebherr-Transportation Systems GmbH & Co KG

Liebherrstrasse 1

2100 Korneuburg

Austria