Linnard?s hydrogen on demand system without electricity !

[ResinRat2]

Hi K,

At this point there is no way to tell the amount of energy needed to periodically regenerate the zinc electrode. There are a few variables still unknown. How efficient is the fuel cell?  Will it be able to handle all the hydrogen produced without building up pressure? What volume of hydrogen is required to keep the fuel cell at maximum output? Do we need a fuel cell stack? How efficiently can we charge a battery to use for periodic zinc regeneration? What is the minimum time and electrical energy needed to keep the zinc from being depleted? I'm sure there are many other variables to add to these, so there is still a great deal of work that needs to be done.

This is going to take some time to work out, but it sounds like an interesting challenge to me. I really wanted to get the fuel cell going, but I think it needs a bit more development before this will happen.

I emailed the PVC company to get information on NaOH resistance. I need to do this before I buy even one part.

Sorry, but that is all I can think of at this point. Let me know if you have any ideas.

Thanks

[Dingus Mungus]

I emailed the PVC company to get information on NaOH resistance. I need to do this before I buy even one part.

http://www.eskimo.com/~ghawk/h-o/chemchrt.htm

[ResinRat2]

Hi Dingus,

Thanks for the info. The NaOH solution will be at a concentration of 10%. Much lower than the 50% on the chart, but this doesn't look like good news. The company that makes the piping hasn't contacted me back yet. I am interested to hear what they say; but I think I will need to look for alternatives. Maybe even a custom-made piece of glassware.

Oh well, just another problem to analyze and overcome.

Thanks again.

[Dingus Mungus]

http://www.usplastic.com/catalog/search.asp?search=Polypropylene&x=3&y=13

Just a link to help shove ya in the right direction... 

There are lots of cheap and easy to work with plastics, but Polypropylene is almost as standard as PVC and it comes in clear. Custom glass reactors are  a long way off in the future. There is still lots to learn! Why waste money on a fancy case?

Glad to hear you're so close to sealing a cell for the first time. Should be a great demo.

BTW is your PEM (H2+O2) or (H2+Air)?

~Dingus

[ResinRat2]

Hi Chris,

Fuel Cell Specs: (Fuel Cell Eco H2/Air)
80x80x48 mm
180 g. Weight - 16cm2 electrode area
300mW Power
0.4-0.96V Generated voltage.

I wasn't sure how to handle the oxygen generation at this point, so I chose the Air cell. I can always change things later.

I believe I have found a configuration that mimicks your reactor idea. I will post a picture once I get it drawn up. It will use simple laboratory glassware. Not terribly expensive; probably less than $100 .

Dave