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Does conversion add up?

Ignoring the obvious puns in the title of your News piece "Plant turns electricity into hydrogen," it would have been nice to know how efficient said process was, as historically this has been the Achilles heel of energy storage systems (PE January).

A few sums using the data from your piece show that the efficiency of the conversion of electrical energy to hydrogen at 3.5bar is in the region of 60 to 70% (depending upon whether the higher or lower calorific value is used).

On this basis it would seem to be a reasonable deal, provided the resulting gas is used for space heating in condensing boilers (90% efficient), but maybe not so good where the gas is used subsequently in gas-fired electricity-generation plant.

Mike Croker, Bramber, West Sussex

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Title Annotation:LETTERS: Getting schoolchildren interested, the need to act on climate change, safety experience, and other topics
Author:Crocker, Mike
Publication:Professional Engineering Magazine
Article Type:Letter to the editor
Date:Feb 1, 2014
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