>> People are currently using small diameter (50mm?) pipe to
>> carry Hydrogen around a km or two from a microhydro 
>> scheme
>> to the point of use. Far cheaper than using electric
>> transmission apparently.
>>
> What is there conversion system like at the two ends?
> What efficiancy do they get?

Gargoyle ...

Search
                Hylink Totara Valley

for much more, I imagine

The most pleasing thing below is the high pipeline 
efficiency and capacity.
98% at 1kW range but with they say 240 kW capacity. (Plastic 
pipe).


NZ system.
Industrial research demo on a farm.
Wind turbine  2 KW
Electrolyser
2 km hydrogen pipeline

    Electrolyser    66%
    Pipeline          98% up to 240 KW !
    Fuel cell         35%    up to 1 kW

    Overall           23%

    Target        43%

Burning the Hydrogen would give about 90% + for about 60% 
overall.
I suspect the electrolyser should be able to be vastly 
improved over 66%.

20 powerpoint slides
Good overview.

        http://energy.massey.ac.nz/Documents/conference/Conference%20Presentations/Steve%20Broome.ppt


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