You're estimating fuel demand for a backup hydrogen generator and you search: "hydrogen LHV electricity conversion kg per MWh"; a PEM fuel cell is rated at 55% LHV efficiency and must deliver 1.0 MWh net AC — how much hydrogen is consumed?

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.

During commissioning of a hydrogen-fired furnace you google: "hydrogen flame arrestor failure consequence burner"; the inline flame arrestor plugs with condensate and is bypassed — what hazard does that safeguard not address even when it’s healthy?

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.

Your lead asks for a quick call and you search: "hydrogen end use power generation turbine vs fuel cell selection"; the site needs 5 MW continuous, low NOx, fast ramping, and waste heat recovery at 80–90°C — which option fits best?

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.

While reviewing a retrofit you search: "hydrogen service material selection pipeline steel"; dry hydrogen at 60 bar cycles daily through an API 5L X70 line at ambient temperature — what degradation mechanism dominates?

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.

You're mid-turnaround and type: "hydrogen P&ID symbol check double block bleed"; the GA shows a double block-and-bleed on a tube trailer unloading line but the instrument index lists only two valves — what’s the most credible risk?

A. Safety integrity is set by sensors and logic, not by manual valve count. B. The flow path during normal operation is unchanged. C. Code compliance alone doesn’t resolve maintenance hazards. D. Missing the bleed valve leaves residual pressure with ignition risk when breaking flanges.

With the vessel still pressurised and a decision needed, you search: "hydrogen compression energy 700 bar per kg"; assuming ideal isothermal compression from 20 bar to 700 bar at 300 K, what’s the minimum work per kg?

A. That value is too low and would underpredict motor size. B. Liquids logic doesn’t apply to gases. C. That reflects a different thermodynamic path than specified. D. Using R = 4.124 kJ/kg·K gives roughly 9.9 MJ/kg or 2.7 kWh/kg.

For a city bus fleet you search: "hydrogen end use transport fuel cell vs combustion"; the requirement is zero tailpipe NOx and high part-load efficiency — which end use fits?

A. High flame temperature keeps NOx in play. B. The operating map doesn’t match stop‑start duty. C. Each extra energy conversion cuts efficiency. D. Electrochemical conversion avoids combustion emissions and stays efficient off‑design.

Alarms are chattering and you google: "hydrogen leak detector limitation indoor"; a catalytic bead detector is installed in a hydrogen compressor building — what does it not protect against?

A. Stratification can bypass early warning. B. Contaminants degrade sensitivity over time. C. The measurement principle depends on oxidation. D. Rapid releases can reach flammable levels faster than alarm and response.

You're selecting tubing and search: "hydrogen permeation elastomer seal compatibility"; 700 bar storage uses O‑rings at ambient temperature — which choice minimizes leakage over time?

A. Volume change drives extrusion and leaks. B. The diffusion rate stays problematic at pressure. C. Permeation losses become chronic. D. Fluoropolymers limit diffusion even at elevated pressure.

Six hours before restart you search: "hydrogen blending P&ID Wobbe index control"; the drawing shows a flow control valve on the hydrogen injection line but no Wobbe or calorific feedback — what’s the real operational consequence?

A. The code addresses piping integrity, not combustion quality. B. The energy content shift is downstream of compression. C. Appliance steel selection is a separate issue. D. Without feedback, small flow errors translate into large heating value variation.

Uses of Hydrogen Energy

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Mechanical Engineering

Rating 4 (1419)

Course typeWatch to learn anytime

Duration 148 Min

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Language English

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To obtain a broad knowledge of hydrogen as an energy carrier, the way it will play an important role in various sectors towards decarbonization, current limitations and future scenarios.

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Uses of Hydrogen Energy

5 Lectures

148 min

Use of Hydrogen in Internal Combustion Engines Part -1
22 min
Use of Hydrogen in Internal Combustion Engines Part -2
25 min
Use of Hydrogen in Fuel Cells
35 min
Hydrogen Sensing Part-1
35 min
Hydrogen Sensing Part-2
31 min

Course details

Course suitable for

Oil & Gas
Energy & Utilities
Chemical & Process
Metallurgy & Material Science

Key topics covered

Use of hydrogen in internal combustion engines, fuel cells, hydrogen sensing.

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