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Tham khảo tài liệu 'contemporary robotics - challenges and solutions part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Control of fuel cell systems in mobile applications 201 A mobile PC station represented by a portable computer provides acquisition back-up and processing of measured data their visualization on the intranet internet and interconnection of a real system with a software model. 3.3 Hydrogen circuit control Hydrogen is supplied to the power source system from reservoirs with compressed gas or metal hydride which is heated by the air leaving the cooling fuel cell circuit. Hydrogen reservoirs are followed by a mechanical ball and solenoid valve providing disconnection separation of a hydrogen circuit from the gas reservoirs tanks . This is followed by a reduction valve decreasing the hydrogen pressure from reservoirs up to 25 bar abs. to the operation pressure from 1.1 to 1.5 bar abs. . Another element is most usually a mass flow-meter measuring the mass flow-rate volume flow rate temperature and pressure of hydrogen passing the flow-meter approx. 30 NL min max. . Still before hydrogen entering the fuel cell it passes through a humidification unit where it is saturated by water vapor as needed. A solenoid valve is situated at the exit from a fuel cell providing controlled hydrogen discharge from the fuel circuit. The fuel circle can be also equipped by a pressure sensor monitoring the hydrogen pressure in reservoirs and before the hydrogen entry into a reduction valve. Further the surface temperature of reservoirs with a metal hydride is monitored. 3.4 Reaction air circuit control A compressor suctions the surrounding air via a filter of mechanical impurities and drives it into a compressed air reservoir. The compressed air reservoir of the volume of approx. 10 -20 NL serves to stabilization uniformity of the air oxygen flow into a fuel cell. The reservoir is equipped by a safety relief valve 1.5 bar abs. and underpressure valve 0.7 bar abs. and its input and output are blocked by a solenoid valve in order to control the pressure and volume flow of the oxidizing agent .
