Method for heat recovery in a compressor and a compressor

A compressor comprising:

• a plurality of compression stages connected in series for compressing gas;
• two or more compressed gas heat exchangers for cooling compressed gas, each of the two or more compressed gas heat exchangers comprising at least:
• a primary part for transferring the compressed gas through the compressed gas heat exchanger;
• and
• one or more secondary parts for transferring coolant through the compressed gas heat exchanger for recovering heat from the compressed gas;
• one or more liquid to liquid heat exchangers for cooling of internal components of the compressor comprising at least:
• a primary part for transferring coolant through the liquid to liquid heat exchanger;
• and
• one or more secondary parts for transferring coolant through the liquid to liquid heat exchanger for transferring heat from the internal components to the coolant;
• a coolant circuitry for conducting flow of the coolant via the liquid to liquid heat exchanger and the two or more compressed gas heat exchangers;
• a gas flow circuitry for conducting flow of gas via the plurality of compression stages and the two or more compressed gas heat exchangers;
• wherein
• at least two of the two or more compressed gas heat exchangers are in series connection, wherein the compressor comprises valves to control the flow of the coolant so that the liquid to liquid heat exchanger is switched between flowing in parallel with at least one of the two or more compressed gas heat exchangers and flowing to bypass at least one compressed gas heat exchanger of the two or more compressed gas heat exchangers so that the liquid to liquid heat exchanger is in series with the two or more compressed gas heat exchangers.