The invention relates to a cooling circuit for a fuel cell system and a method for operating the cooling circuit, where prior to feeding a coolant to said cooling circuit a pre-conditioned coolant is prepared from a freshly prepared coolant, whereby the fr...

A generating system for a fuel cell, and heat waste recirculating and cooling system of said generating system, comprising: a water tank (162) for temporarily storing hot water generated by the fuel cell (50), a heat exchanger (164) in thermal conductive c...

A fuel cell system is provided with a fuel cell body, a hydrogen supply system supplying hydrogen containing gas to the fuel cell body, an oxygen supply system supplying oxygen containing gas to the fuel cell body, a cooling system adjusting the temperatur...

A water pump (4) recirculates water from a water tank (3) in a heat exchanger (2) and a fuel cell stack (1) of a fuel cell power plant via a recirculation passage (5) A water temperature sensor (13) detects a water temperature in the recirculation passage ...

The cooling system has a cooling medium circulated in a cooling circuit containing at least one cooler (2), a cooling medium pump (3) and additional components (5) to be cooled external to the fuel cell (4), with valves (8,10) controlling the flow quantity...

A method and apparatus for detecting leakage current in the coolant of a fuel cell stack (60) between said stack (60) and the grounded stack chassis (62), using a voltmeter to measure the voltage (V1) across the coolant. If the coolant voltage (V1) is at o...

A fuel cell system comprises a medium circulating passage (72) for supplying, in a circulating manner, a temperature adjusting medium to a fuel cell stack (12), and first and second temperature sensors (84a), (84b) for detecting medium temperatures at a te...