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Reversible R744 (CO2) heat pumps applied in public trains.

Author(s) : HAFNER A., CHRISTENSEN Ø., NEKSÅ P.

Summary

This paper presents the opportunity for use of R744 (CO2) as refrigerant in the air conditioning system in public trains. The R744 system shall provide cooling in the summer and heating in the winter. Today, 75% of the air conditioning systems in trains use HFC-134a as refrigerant. The GWP of HFC-134a is 1410 while R744 is 1(0). A replacement from HFC-134a to R744 gives possibilities of large environmental savings. Different technical system solutions of the heat pump are presented, each with its own method of providing cooling and heating. Solution I; changes between cooling and heating mode are performed by changing the direction of the refrigerant flow through the system. Solution II changes between cooling and heating mode are done by changing the configuration of the air streams (movable hatches) through the heat exchangers. In Solution III the refrigerant flow direction and the configurations of the air streams is always the same. The whole heat pump is placed on a turntable unit and the change between cooling and heating is done by rotating the entire heat pump 180°.

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Pages: 2010-2

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Details

  • Original title: Reversible R744 (CO2) heat pumps applied in public trains.
  • Record ID : 2010-1288
  • Languages: English
  • Subject: Environment
  • Source: 9th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2010). Proceedings. Sydney, Australia, April 12-14, 2010.
  • Publication date: 2010/04/12

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