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Re: Looking for advice on datacenter electrical/generator

  • From: Leo Bicknell
  • Date: Fri Apr 04 19:52:18 2003

In a message written on Fri, Apr 04, 2003 at 04:13:46PM -0800, Bill Woodcock wrote:
> Right.  So if you have a choice of storing gas or diesel, and gas usually
> doesn't have to be replentished by truck, since it's _usually on-tap_, but
> diesel _always has to be replentished by truck_, since it's _never
> on-tap_, why would one ever choose diesel unless, as per previous caveat,
> clueless fire marshalls thought it was really preferable?

I'm not an expert but:

1) Storing natural gas is significantly harder (both in the containers
   and permiting) than Diesel.  It also has less energy density, so it
   takes more space.

2) Having natural gas trucked in, rather than delivered via pipeline
   is also extremely difficult, and possibly impossible in some areas.
   The infrastructure simply doesn't exist.

   On the other hand I could pick up the phone and have a semi-truck
   full of Diesel in any major metropolitan area in an hour or so
   for cheap.  Indeed, it's very easy to get "guaranteed responce
   time" diesel contracts for emergency generators, I'd love to know
   if anyone has even attempted that with Natural Gas delivery by
   truck.

3) Getting a natural gas feed for a large data center (read a couple
   of megawatts) is probably impossible in most areas.  The distribution
   network for natural gas just isn't set up for it.  Much less of a
   concern for the people who need a few hundred kilowatts.

4) In larger sizes, Diesel gensets are _cheap_.  Remember, the thing
   sitting outside the data center is essentially the same as every
   diesel-electric railroad locomotive, every portable power source,
   and a whole number of other things.  Natural gas isn't generally
   a good idea for your train locomotive, so the gensets are less
   tested, harder to find, and more expensive.

So, IMHO, natural gas is good for smaller applications (probably
under 250Kw), in areas where the gas is stable so you don't have
to do on site storage.  Otherwise Diesel is probably cheaper (both
in genset cost and fuel cost), and easier to obtain.

-- 
       Leo Bicknell - bicknell@ufp.org - CCIE 3440
        PGP keys at http://www.ufp.org/~bicknell/
Read TMBG List - tmbg-list-request@tmbg.org, www.tmbg.org

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