A thermoelectric generator system comprising: a thermoelectric generator; a vortex tube comprising a flow input configured to receive an input of compressed gas and to separate the compressed gas into a hot flow discharged from a first output of the vortex tube, and a cold flow discharged from a second output of the vortex tube; a sensor system configured to determine a first parameter indicative of a temperature of the hot flow, a second parameter indicative of a temperature of the cold flow and a third parameter indicative of a temperature of a third fluid flow; a radiator system comprising: a first heat exchanger and a second heat exchanger disposed on opposing sides of the thermoelectric generator; and a tube system configured to separately direct the hot flow, the cold flow and the third fluid flow towards a switch arrangement, wherein the switch arrangement is configured to receive each of the hot flow, the cold flow and the third fluid flow, and to be moveable between: a first configuration in which the cold flow is directed to the second heat exchanger and the hot flow is directed to the first heat exchanger; a second configuration in which the cold flow is directed to the second heat exchanger and the third fluid flow is directed to the first heat exchanger; and a third configuration in which the third fluid flow is directed to the second heat exchanger and the hot fluid is directed to the first heat exchanger; the thermoelectric generator system further comprising a control unit configured to control the configuration of the switch arrangement based on the first parameter, the second parameter, and the third parameter. a thermoelectric generator; a vortex tube comprising a flow input configured to receive an input of compressed gas and to separate the compressed gas into a hot flow discharged from a first output of the vortex tube, and a cold flow discharged from a second output of the vortex tube; a sensor system configured to determine a first parameter indicative of a temperature of the hot flow, a second parameter indicative of a temperature of the cold flow and a third parameter indicative of a temperature of a third fluid flow; a radiator system comprising: a first heat exchanger and a second heat exchanger disposed on opposing sides of the thermoelectric generator; and a tube system configured to separately direct the hot flow, the cold flow and the third fluid flow towards a switch arrangement, wherein the switch arrangement is configured to receive each of the hot flow, the cold flow and the third fluid flow, and to be moveable between: a first configuration in which the cold flow is directed to the second heat exchanger and the hot flow is directed to the first heat exchanger; a second configuration in which the cold flow is directed to the second heat exchanger and the third fluid flow is directed to the first heat exchanger; and a third configuration in which the third fluid flow is directed to the second heat exchanger and the hot fluid is directed to the first heat exchanger; a first heat exchanger and a second heat exchanger disposed on opposing sides of the thermoelectric generator; and a tube system configured to separately direct the hot flow, the cold flow and the third fluid flow towards a switch arrangement, wherein the switch arrangement is configured to receive each of the hot flow, the cold flow and the third fluid flow, and to be moveable between: a first configuration in which the cold flow is directed to the second heat exchanger and the hot flow is directed to the first heat exchanger; a second configuration in which the cold flow is directed to the second heat exchanger and the third fluid flow is directed to the first heat exchanger; and a third configuration in which the third fluid flow is directed to the second heat exchanger and the hot fluid is directed to the first heat exchanger; a first configuration in which the cold flow is directed to the second heat exchanger and the hot flow is directed to the first heat exchanger; a second configuration in which the cold flow is directed to the second heat exchanger and the third fluid flow is directed to the first heat exchanger; and a third configuration in which the third fluid flow is directed to the second heat exchanger and the hot fluid is directed to the first heat exchanger; the thermoelectric generator system further comprising a control unit configured to control the configuration of the switch arrangement based on the first parameter, the second parameter, and the third parameter.