Cooling system for a fuel cell and connected steam turbine

The system (1) has a cooling passage (14) i.e. heat exchanger, connected with a steam turbine (22) in a cooling circuit. The steam turbine is connected with a power generator and with an electrical unit of the system such that the steam turbine directly or indirectly drives the electrical unit. A condenser (24) condenses a coolant and is located in the form of a rear part of the steam turbine. The passage supplies polyether as the coolant, where the polyether is selected from a polyethylene glycol dimethyl ether and a polyalkylene glycol such as polypropylene glycol and polyethylene glycol.