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6. Which is true of hydrogen fuel...
- Releases C02 when partially combusted
- Can be generated using surplus or intermittent primary energy sources e.g. wind which can’t be stored
- Low energy density
- Can't be generated using surplus or intermittent primary energy sources, only fossil fuels.
- combustion product is Nox
7. The 'hydrogen economy' may help solve vehicle pollution problems
8. Demand for energy fluctuates over a number of timescales. Daily, it peaks...
- ...early morning (around 4am)
- ...at afternoon snack time
- ...about 3.50pm
- ...at main meal times
- ...in the night
9. The high energy density store of hydrogen can be released in two ways:
- Combustion to produce gas which powers turbine-run generators. Electrochemically, in a fuel cell where the hydrogen reacts with oxygen to form water.
- Combustion to produce heat. Electrochemically, in a fuel cell where the hydrogen reacts with oxygen to form water.
- Combustion to produce heat. Electrochemically, in a gas cell where the hydrogen reacts with oxygen to form CO2