KETEP 세계에너지시장정보

Heat exchanger system (100, 200, 300, 400, 500, 600, 700) for operating a fuel cell stack (190),
having: a first compressor (142) and a second compressor (150) for the cathode gas fed to the fuel cell stack (190), wherein the second compressor (150) is arranged fluidically downstream of the first compressor (142); a turbine (155) which is mechanically coupled to the second compressor (150) and against which cathode gas discharged from the fuel cell stack (190) flows; a first heat exchanger (110) which is thermally coupled to the supplied cathode gas between the first compressor (142) and the second compressor (150); a second heat exchanger (120) which is thermally coupled to the supplied cathode gas downstream of the second compressor (150); a fourth heat exchanger (140) which is thermally coupled to the discharged cathode gas downstream of the turbine (155); wherein the fourth heat exchanger (140) is thermally variably coupled to the first heat exchanger (110) and to the second heat exchanger (120) in order to control a heat exchange for cooling the first heat exchanger (110) and the second heat exchanger (120), characterized in that the fourth heat exchanger (140) is thermally variably coupled to both the first heat exchanger (110) and the second heat exchanger (120) by means of a coolant and a first three-way valve (161) in order to cool the cathode gas upstream and downstream of the second compressor (150).