APPARATUS AND METHOD FOR LOW GRADE HEAT RECOVERY IN AN ELECTRIC VEHICLE

Embodiments of the present invention provide a heat recovery system for an electric vehicle (), comprising first and second switchable heat sources () and a control means () operable to selectively switch one of the heat sources into thermal communication with a compressor () in a thermodynamic cycling system (), the thermodynamic cycling system being in thermal communication with a heat sink (); and a detection means (, T) operable to detect a temperature differential between each of the switchable heat sources and a fluid entering the compressor; wherein the control means is operable (adapted, arranged) to switch one of the first and second switchable heat sources into thermal communication with the thermodynamic cycling system when a temperature differential is detected between the fluid entering the compressor in the thermodynamic cycling system and the heat available from the switchable heat source, the temperature differential being 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 ().