Patent ID: 11958334
Assignee: JAGUAR LAND ROVER LIMITED
Field: Transport (Mechanical engineering)
Classification: CPC B  Y | IPC B

Claim 17:
18. A method of recovering low grade heat energy in an electric vehicle, comprising providing first and second switchable low grade heat sources;
providing a thermodynamic cycling system comprising first and second fluids in thermal communication with each of the first and second switchable low grade heat sources respectively;
detecting a temperature differential between a fluid entering a compressor in the thermodynamic cycling system and the heat available from the first and the second switchable heat source,
switching the first or second fluid in thermal communication with one of the switchable heat sources into thermal communication with a compressor in the thermodynamic cycling system when the temperature differential is such that the compressor is operable to upgrade low grade heat from the switchable heat source to a higher grade heat upon operation of the compressor;
transferring the higher grade heat to a heat sink.