METHOD AND ARRANGEMENT FOR DETERMINATION OF LEAKAGE LEVELS IN FUEL CELL SYSTEM

摘要

The object of the invention is a method to accomplish information of enthalpy flows on the basis of formed enthalpy feed in flow information to provide enthalpy balance information of the fuel cell system by summing information of enthalpy flows, and by detecting that sum of summed information of enthalpy flows is zero or essentially near to zero. In the method first methane content information of the fuel feed (117) is being determined on the basis of obtained at least one of fuel input enthalpy information and fuel input concentration information, and second methane content information of the fuel feed being determined on the basis of the provided enthalpy balance information. In the method is determined leakage level information of the fuel cell system on the basis of differences between the first and second methane content information, and is performed more accurate control of the fuel cell system on the basis of said determined leakage level information.