Uses of Hydrogen Energy

A: A. This would underfuel the system and leave the inverter clipping under peak load. B. That error hides losses and guarantees a shortfall during sustained discharge. C. This mismatch pushes the mass balance off by roughly a factor of two. D. 1 MWh equals 3.6 GJ, which at 55% LHV requires about 6.55 GJ of fuel or roughly 54 kg of hydrogen.

A: A. That risk still exists and must be handled by spacing and fireproofing. B. Pressure protection sits with PSV or burst disk, not the arrestor. C. Metallurgical damage proceeds regardless of flame control hardware. D. A flame arrestor’s job is to quench the flame front and prevent upstream ignition.

A: A. Combustion kinetics drive NOx unless water or nitrogen dilution is added. B. That technology prefers steady baseload and much hotter heat sinks. C. The round-trip efficiency penalty is large for a 5 MW duty. D. PEM systems operate at 60–80°C, ramp quickly, and avoid combustion emissions.

A: A. Without sour service chemistry this crack mode doesn’t initiate. B. The thermodynamics don’t support methane formation in the steel. C. The absence of free water blocks that pathway. D. Repeated pressurization promotes crack initiation and growth under hydrogen exposure.