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Energy Conversion Info

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  • Steve Stelzer
    FYI from the Center for Renewable Energy & Sustainable Technology (CREST) newsletter. Steve Stelzer Date: Thu, 01 Mar 2001 19:08:57 -0500 To:
    Message 1 of 1 , Mar 5, 2001
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      FYI from the Center for Renewable Energy & Sustainable Technology (CREST)
      newsletter.

      Steve Stelzer

      Date: Thu, 01 Mar 2001 19:08:57 -0500
      To: greenbuilding@...
      From: "Bion D. Howard" <bdhoward@...>
      Subject: Cost per BTU
      Message-Id: <3.0.5.32.20010301190857.0080c8a0@...>

      Cost per BTU
      ~~~~
      Pretty useful little table, with a couple of caveats.

      $/Kwh (3,412Btus/Kwh ?) -- is only the conversion for the electric power
      used on site. The actual primary energy needs to be recalculated to
      reflect the losses of generation, transmission, etc. from plant to property
      line so conveniently disguised by the "site energy" factor. For this you
      need the "heat rate" which can be increasingly hard to uncover now that
      utilities are mixing power across service territory boundaries from
      different generation modes.

      try ~ 9,000 Btus/Kwh (lots of hydro, nuclear, non-fossil, local) to

      a top end of about 15,000 Btus/Kwh (extremely dirty fuel in very
      inefficient plant, transported over long distances.)

      $/Square Foot of Solar Aperture (100,000Btus/SF) - needs to be calculated
      on the basis of a competent annual energy simulation, using accurate
      climate data, and also should be properly discounted over the life-cycle of
      the solar collection device.

      -- Bion Howard

      === you wrote
      >One bit of data, in this calculation, that only you can most easily and
      >accurately provide, is the cost per purchased fuel unit at your site:
      >
      >Such fuel associated costs might be labeled:
      >$/therm of gas (100,000Btus/therm),
      >$/Kwh (3,412Btus/Kwh ?),
      >$/cord firewood (80-120,000Btus/cord ?),
      >$/Square Foot of Solar Aperature (100,000Btus/SF)
      >$/LPG (propane) @ 95,475 btus/gal.
      >$/Coal (lignite) @ 14,940 btus/lb.
      >$/Kerosene @ 137,900 btus/gal.
      >$/#2 Oil @ 138,690 btus/gal
      ============

      -
      || Contact: Bion D. Howard, President
      =(O) = Building Environmental Science & Technology
      || P.O. Box 1107 Edgewater, MD 21037 USA
      Phone: 410.867.8000 Telefax: 301-889-0889
      <http://www.energybuilder.com>
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