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Glossary

The Kallanish Glossary aims to be a useful resource for complex industry specific terminology. We are constantly adding to our glossary, so if you have a suggestion or amendment please do get in touch.
Stack
A fuel cell stack is an arrangement of individual fuel cells,usually in series to provide a useful output voltage.
Thermal efficiency

The thermal efficiency of a fuel cell system is the ratio between the output of the system (as heat and power) and the heat-content of the input fuel.

Tubular solid oxide fuel cell

SOFC can have multiple geometries. The tubular geometry is where either air or fuel is passed through the inside of a tube and the other gas is passed along the outside of the tube.

UPS

Uninterruptible power supply.

URFC

A unitised regenerative fuel cell is a reversible fuel cell which can operate either as a fuel cell,or in reverse like an electrolyser.

W

Watt, a unit of power. It is a measure of the rate of energy conversion or generation, equivalent to one joule per second.

ZEV

A zero emission vehicle is one which has no tailpipe exhaust or evaporative emissions of fuel; hydrogen fuel cells cars count as zero emission vehicles. Their only output is water.

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