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  • Double check my unit conversions?

    Hi everyone ...

    I just added a feature to CNGPrices where you can click on the price in the popup menu and it will take you to a page where you can convert the units and currency to see how much it really means that Germans pay 0.89 Euro per kg (3.56 dollars per gge).

    I wanted to verify my unit conversions since I'm not 100% sure on all of them (some of this info is hard to find, at least in reference to CNG), and was hoping you guys would be able to shed some light. Here's what I have:

    1 Gasoline Gallon Equivalent (gge) = 2.56 kg
    1 Gasoline Gallon Equivalent (gge) = 3.2 Nm3
    1 Gasoline Gallon Equivalent (gge) = 3.785 L

    That's what I have so far. If there are other units you would like to see in the database, let me know (and their conversions!). Currency exchanges are updated daily from the web, so those should always reflect the most recent exchange rates.

    You can also go directly to the unit conversion page.

    Cheers,
    Todd
    CNG Vehicle - 2002 Honda Civic GX
    CNGPrices.com - The latest prices at CNG stations near you
    AltFuelPrices.com - Prices and station locations for CNG, E85, Biodiesel and more!

  • #2
    Re: Double check my unit conversions?

    Todd,

    Great mash-up.

    Showing the rate in Therms would be helpful too.

    And as long as you are mashing, a comparison and trending with the spot market natural gas rates would be cool. It would help answer the question of whether natural gas pump prices are rising with the cost of natural gas or if other factors are affecting the price.

    Comment


    • #3
      Re: Double check my unit conversions?

      Todd,
      Your site rocks!

      While we are making the wish list... A tab to insert GPS coordinates would also be way cool, along with a way to download these coordinates into a file?

      Comment


      • #4
        Re: Double check my unit conversions?

        Hi Todd :

        Wow that cngprices.com WEB site is really becoming a valuable information source.

        You know what would be really cool, is a Miles per GGE calculator. Allow the User to input the miles travelled since there last Fill-up, then the GGE value used to fill-up, and presto; Miles per GGE.

        Also, there is also an Imperial Gallon. Up here in Canada, we use the Imperial Gallon, just like the British.

        So, 1 Imperial gallon is 4.549 Liters, while 1 U.S. Gallon is 3.78541 liters

        Keep up the good work

        Stu Man

        Comment


        • #5
          Re: Double check my unit conversions?

          Originally posted by cngprices View Post
          Hi everyone ...

          I just added a feature to CNGPrices where you can click on the price in the popup menu and it will take you to a page where you can convert the units and currency to see how much it really means that Germans pay 0.89 Euro per kg (3.56 dollars per gge).

          I wanted to verify my unit conversions since I'm not 100% sure on all of them (some of this info is hard to find, at least in reference to CNG), and was hoping you guys would be able to shed some light. Here's what I have:

          1 Gasoline Gallon Equivalent (gge) = 2.56 kg
          1 Gasoline Gallon Equivalent (gge) = 3.2 Nm3
          1 Gasoline Gallon Equivalent (gge) = 3.785 L

          That's what I have so far. If there are other units you would like to see in the database, let me know (and their conversions!). Currency exchanges are updated daily from the web, so those should always reflect the most recent exchange rates.

          You can also go directly to the unit conversion page.

          Cheers,
          Todd
          Todd, Thanks for the great site.

          Here's one more from PG&E: 1.276 therms = 1 GGE

          You may want to check http://en.wikipedia.org/wiki/GGE
          Most of the info has footnotes so you can also verify the original source.
          With no pressure the GGE of natural gas is 127.77 cubic feet

          NOTE: Under ideal conditions PV=nRT
          http://en.wikipedia.org/wiki/PV%3DnRT
          The only thing I remember from chemistry.

          The 1 Gasoline Gallon Equivalent (gge) = 3.785 L is for liquids.
          From Google: 1 US gallons = 3.78541178 liters so this would be not be under pressure.

          Again, from wikipedia
          "... equivalent GGE at 3,600 psi is 0.51 cubic feet which corresponds to 14.5 liters or 3.82 actual US gallons"

          So, eventhough I've probably added to the confusion you can look at the footnotes and go to the US government sources.

          Here's an interesting page: http://astro.berkeley.edu/~wright/fuel_energy.html

          ch4
          We really do try to do the right thing. We don't always succeed, and sometimes we really screw up.
          CH

          Comment


          • #6
            Re: Double check my unit conversions?

            Originally posted by echamberlain View Post
            Todd,

            Great mash-up.

            Showing the rate in Therms would be helpful too.

            And as long as you are mashing, a comparison and trending with the spot market natural gas rates would be cool. It would help answer the question of whether natural gas pump prices are rising with the cost of natural gas or if other factors are affecting the price.

            Price per therm will vary with your gas co rates/tarriffs on a monthly basis. You want to look at trends on the spot market and influencing factors, go here: http://www.eia.doe.gov/oil_gas/natur...tural_gas.html
            I generally follow the short term forcasts, but there's a gillion ways to review this info... good luck unless you have some knowledge of all the terminology and what it means, or relates to. Pretty heady stuff if you try and get too far in. I stay at the shallow end myself.
            [ATTACH=CONFIG]temp_4586_1441434431016_578[/ATTACH]

            Comment


            • #7
              Re: Double check my unit conversions?

              Thanks everyone. I added Therms to the list, and I don't think that I will try to add prices for Natural Gas ... like Curtis said, there are too many variables to try and figure it out for everywhere in the world I have stations listed.

              I am working on a feature that will show a chart of the price history at a station, which should be interesting. (Of course the price history only works if my site has a price history for that station, so keep the updates coming! =)

              Cheers,
              Todd
              CNG Vehicle - 2002 Honda Civic GX
              CNGPrices.com - The latest prices at CNG stations near you
              AltFuelPrices.com - Prices and station locations for CNG, E85, Biodiesel and more!

              Comment


              • #8
                Re: Double check my unit conversions?

                Just some more info here guys. You have to check with your gas company's website to find out what they are billing you for and what your local therm is at. NICOR (Illinois) has a therm variance which is about 1.02 therms per 100cu.ft. of gas provided. I had to dig into the riders pdf docs to find out this info historically. It's a pain in the A$$.

                So be careful with the therm here in your calculations because you are using a standard therm (100,000btu) (100 cu. ft. of gas)

                Due to variance of temperature and pressure, a therm in your area may vary from standard. To find out the BTU's per pound, divide your therm into 100,000 BTU's (100 cubic feet or 1 standard therm).
                To find the number of BTU's per GGE, multiply the result by 5.66 (1 standard GGE).

                For example, if the therm of your area is 4.96 lbs, divide that number into 100,000 and you have the resulting BTU's per lb. of 20,161.29.

                To find the BTU's per GGE, multiple that resulting number (20,161.29) by 5.66 (a standard GGE) and you have 114,112.9 BTU's per GGE.

                And per the NationalConferenceWeightsMeasures 1gge is equal to 2.567kg (5.660lb) of natural gas.

                Comment


                • #9
                  Re: Double check my unit conversions?

                  how many GE Gallons can you put in a CNG tank( the size most sedan carry) at 3000 psi.

                  Comment


                  • #10
                    Re: Double check my unit conversions?

                    Like any tank, it depends on the size. CNG tanls run from 3 gge and up. Most vehicle tanks are from 6 gge to 11 gge, depending on the application. You can also run multiple tanks.

                    You might try calling your local city office and see if you have a local Clean Cities representative, or even a local Air Quality District person in your area. If so, they should be most helpful if finding both resources to assist you with conversions and possibly even grant funds to pay for the bulk of it.
                    [ATTACH=CONFIG]temp_4586_1441434431016_578[/ATTACH]

                    Comment


                    • #11
                      Re: Double check my unit conversions?

                      So is 1 Therm greater than 1 Gallon ?

                      Trying to figure out what I pay here at home for CNG and how it would relate to filling up a CNG car.

                      My Gas bill says I am paying $1.34 for 1 therm

                      The converter seems to say that 1 therm is equal to 1.20 gallons? is that right?

                      Comment


                      • #12
                        Re: Double check my unit conversions?

                        Originally posted by chasesigi View Post
                        So is 1 Therm greater than 1 Gallon ?

                        Trying to figure out what I pay here at home for CNG and how it would relate to filling up a CNG car.

                        My Gas bill says I am paying $1.34 for 1 therm

                        The converter seems to say that 1 therm is equal to 1.20 gallons? is that right?
                        That is close. In theory, 1 therm is 100,000 BTU's of gas. A gallon of gasoline has approx 114,000 BTU's, so a GGE would be 1.14 therms. However, this is all in theory, as natural gas is just that, a natural product, and has a lot of variation in composition. This will make any truely accurate conversion moot.
                        1997 Factory Crown Victoria w/ extended tanks ~~ Clunkerized!
                        2000 Bi-Fuel Expedition --> ~~ Sold ~~ <--

                        Comment


                        • #13
                          Re: Double check my unit conversions?

                          When speaking about CNG prices I'd like to think it in Liters(cm3).
                          Isn't it so when it's in 200 bar, the Kilo is relevant, but when pressure is lowered to 2 bar in car's fuelsystem, one liter of CNG is comparable with diesel oil net caloric value?

                          If vehicle runs with 10 L / 100 km in gas, it consumes about 10 cm3 / 100 km in CNG, right?

                          So my point is that the kg would be a bulk measurement and liter a consumer measurement, therefore comparable with other propellants...

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