I suspect it's far worse than that. H2 will pool against the ceiling but
it will probably leak through pretty quickly and fill up the joist
cavity, and then the ceiling of the floor above, and so on.
Maybe the Mirai tank system is really tight. Otherwise, I'm really
curious: why haven't there been any reported H2 explosions ?
Peri
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------ Original Message ------
From: "Bill Dube via EV" <[email protected]>
To: [email protected]
Cc: "Bill Dube" <[email protected]>
Sent: 09-Sep-21 20:00:22
Subject: [EVDL] "H2 is lighter" (Was OT: fuel cell mining truck)
Indeed, H2 is very buoyant in air and rises extremely quickly.
However, this means that it collects and concentrates at the high points of the
ceiling in an enclosed space. Typically, the garage door opener is also in that
space, as well as light fixtures, etc. The garage door opener has relays with
contacts. Older fluorescent lights also have contacts in the small starter.
There are all sorts of ignition sources at or near the ceiling where the H2
will concentrate.
Thus, garaging a H2 fuel cell vehicle is against the regulations, for a
multitude of reasons.
Having worked with liquid hydrogen in a hydrogen safe building for many years,
I am acutely aware of the hazards it presents and the measures one must take to
reduce the risk of those very real hazards.
Bill D.
3.) With regard to garaging, I was reading a while back that the
_hydrogen is so light that it would float and disperse_ readily
generating the idea a HFCEV could be garaged. If I find the article I
will post it but the comments you found in a passage about getting it
out and into a well-ventilated space makes me want to find an
authoritative source. It may be the difference between a slow leak
and something faster.
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