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  • g/kwh to gal/h

    I am trying to compare fuel consumption ratings on Diesel electric generators
    The american ones show gals per hour of consumption at 50% load 75% load & 100% load which is what I am familiar with.
    All the other generator sets are rated by g/kwh which I think is grams per Kilowatt hour?
    What I'm having trouble with is a gram is a weight not a volume? Do I multiply the total kilowatt hours which in this case is 60kw x the grams per hour(in this case 230) 60x230=13,800 grams
    Do I have to figure out what a gal of diesel fuel wieghs? and the convert the grams to weight?

    Any help would be great.
    Thanks A+

  • #2
    Re: g/kwh to gal/h

    I found a chart that lists diesel fuel oil 20 to 60 at 15 C as having a density between 820 and 950 kilograms/cubic meter (which is the same as gram/liter).

    If you know how many grams of fuel you have:
    grams / 820 gram/liter = liters

    If you know how many liters of fuel you have:
    liters * 820 gram/liter = grams

    Now just convert liters to gallons, or gallons to liters first.
    1 gallon [US, liquid] = 3.7854118 liter

    Also you may wish to use a mid value between 820 and 950 for the density, or work the formula out for both 820 and 950 to get the range.

    Comment


    • #3
      Re: g/kwh to gal/h

      I would to convert a 213 g/kwh to l/h

      Comment


      • #4
        Re: g/kwh to gal/h

        i would like to know how to convert from g/kWh to l/h ?? must i change it to other forms before i could proceed to liter/hour..??

        thank you so much

        Comment


        • #5
          Re: g/kwh to gal/h

          Originally posted by Robert Fogt
          I found a chart that lists diesel fuel oil 20 to 60 at 15 C as having a density between 820 and 950 kilograms/cubic meter (which is the same as gram/liter).

          If you know how many grams of fuel you have:
          grams / 820 gram/liter = liters

          If you know how many liters of fuel you have:
          liters * 820 gram/liter = grams

          Now just convert liters to gallons, or gallons to liters first.
          1 gallon [US, liquid] = 3.7854118 liter

          Also you may wish to use a mid value between 820 and 950 for the density, or work the formula out for both 820 and 950 to get the range.
          I think that range is combining diesel and fuel oil. 950 g/L is a pretty heavy fuel oil, needs heating to keep it flowing. #1 diesel (winter) would be at the low end of your range, maybe even a little lower, #2 diesel maybe 0.83-0.85, There is lot and refinery variation

          Comment


          • #6
            Re: g/kwh to gal/h

            Originally posted by A+ Ano
            I am trying to compare fuel consumption ratings on Diesel electric generators
            The american ones show gals per hour of consumption at 50% load 75% load & 100% load which is what I am familiar with.
            All the other generator sets are rated by g/kwh which I think is grams per Kilowatt hour?
            What I'm having trouble with is a gram is a weight not a volume? Do I multiply the total kilowatt hours which in this case is 60kw x the grams per hour(in this case 230) 60x230=13,800 grams
            Do I have to figure out what a gal of diesel fuel wieghs? and the convert the grams to weight?

            Any help would be great.
            Thanks A+
            Yes, you have two units problems. One is grams and gallons. Diesel has a density around 850 g/L. Divide by the grams by this figure to get liters, then 3.7854 L/gal to get gallons.

            To compare to the other figures, you have to multiply the g/kWh figure by the number of kWh, and it has to correspond with the stated load for the generator you are comparing to.

            The other way might be to convert the US generators to g/kWh figures. To do that, convert gallons to liters, then to grams using density. Divide by the kWh load corresponding to that stated fuel consumption.

            Comment


            • #7
              Re: g/kwh to gal/h

              help me! covert g/kw.h to l(diezel)/h:

              Comment


              • #8
                Re: g/kwh to gal/h

                Originally posted by Robert Fogt
                I found a chart that lists diesel fuel oil 20 to 60 at 15 C as having a density between 820 and 950 kilograms/cubic meter (which is the same as gram/liter).

                If you know how many grams of fuel you have:
                grams / 820 gram/liter = liters

                If you know how many liters of fuel you have:
                liters * 820 gram/liter = grams

                Now just convert liters to gallons, or gallons to liters first.
                1 gallon [US, liquid] = 3.7854118 liter

                Also you may wish to use a mid value between 820 and 950 for the density, or work the formula out for both 820 and 950 to get the range.
                The data that I have is

                Fuel consumption at full load: appr. 213 [g/kWh]

                Now : How much fuel is the equipment actually consuming per hour ?

                For your info : It is an AC Generator designed to give 200 V AC power @ 400 HZ frequency and power Factor of 180 KVA.

                Comment


                • #9
                  Re: g/kwh to gal/h

                  Originally posted by Robert Fogt
                  I found a chart that lists diesel fuel oil 20 to 60 at 15 C as having a density between 820 and 950 kilograms/cubic meter (which is the same as gram/liter).

                  If you know how many grams of fuel you have:
                  grams / 820 gram/liter = liters

                  If you know how many liters of fuel you have:
                  liters * 820 gram/liter = grams

                  Now just convert liters to gallons, or gallons to liters first.
                  1 gallon [US, liquid] = 3.7854118 liter

                  Also you may wish to use a mid value between 820 and 950 for the density, or work the formula out for both 820 and 950 to get the range.
                  Fuel consumption at full load: appr. 213 [g/kWh]

                  Now...what will be amount of fuel consumed per hour ?

                  This is for a 180 KVA generator supplying 200 V AC @ 400 HZ .

                  Please help me sort this out

                  Comment


                  • #10
                    Re: g/kwh to gal/h

                    Originally posted by euphoria_82
                    Fuel consumption at full load: appr. 213 [g/kWh]

                    Now...what will be amount of fuel consumed per hour ?

                    This is for a 180 KVA generator supplying 200 V AC @ 400 HZ .

                    Please help me sort this out
                    Lets avoid issues of the "power factor" of the load, and assume power factor is 1, so 180 KVA = 180 kW.

                    213 g/kWh x 180 kW = 38340 g/h or 38.340 kg/h
                    A liter of diesel fuel is about 0.85 kg, so 45.1 L/h or 11.9 US gallons per hour at full load. If generator is not putting out full load, consumption will be less, but not linearly with load (it still consumes fuel just to spin, even if no load is connected.)

                    Comment


                    • #11
                      Re: g/kwh to gal/h

                      Originally posted by JohnS
                      Lets avoid issues of the "power factor" of the load, and assume power factor is 1, so 180 KVA = 180 kW.

                      213 g/kWh x 180 kW = 38340 g/h or 38.340 kg/h
                      A liter of diesel fuel is about 0.85 kg, so 45.1 L/h or 11.9 US gallons per hour at full load. If generator is not putting out full load, consumption will be less, but not linearly with load (it still consumes fuel just to spin, even if no load is connected.)
                      Thanks a lot John..You made it really simple.

                      I applied the same logic to calculate the consumption for a Air Conditioning Unit (115 Tons) that had "Specific fuel consumption at maximum torque : 200 g/KWh.". Here the output of the engine was expressed in BHP. I simply converted BHP to KW (Mulitplied BHP by 0.7457 to get KW) and then got the calculation done as you mentioned

                      Thanks all the way from India

                      Comment


                      • #12
                        Re: g/kwh to gal/h

                        Dear A+,

                        I had to do the conversion this moring for myself. Back to basics.
                        I used info available at various conversion sites and please feel free to check my figures.

                        1 gram = .0001 Kg
                        1 Kg = 2.2046 lbs
                        7.2 lbs = 1 gallon of diesel

                        1 gram or .001 Kg x 2.2046 lbs/Kg = .0022046 lbs.
                        .0022046 lbs x 1 gal /7.2 lbs = .000306 gallon

                        So 1 gram = .000306 gallon

                        Your consumption is given in g/kWh and you want gal/kWh so the only thing that changes is from

                        So let's take a consumption of 211 g/kWh x .000306 gallon = .064566 gallon and your genset is rated at 180 kW = 11.62 gallons per hour


                        Hopes this helps


                        Originally posted by A+ Ano View Post
                        I am trying to compare fuel consumption ratings on Diesel electric generators
                        The american ones show gals per hour of consumption at 50% load 75% load & 100% load which is what I am familiar with.
                        All the other generator sets are rated by g/kwh which I think is grams per Kilowatt hour?
                        What I'm having trouble with is a gram is a weight not a volume? Do I multiply the total kilowatt hours which in this case is 60kw x the grams per hour(in this case 230) 60x230=13,800 grams
                        Do I have to figure out what a gal of diesel fuel wieghs? and the convert the grams to weight?

                        Any help would be great.
                        Thanks A+

                        Comment


                        • #13
                          Re: g/kwh to gal/h

                          Rated Power kva 20
                          Max power kva 22.5
                          PHASE three
                          Frequency (HZ) 50HZ
                          Rated voltage (V) 220~240/110~120;400/230V
                          Rated Current (A) 34.7A
                          Bore*Stroke 100x115
                          Displacement(L) 3.61
                          12h Power kw(ps) 26.5
                          Fuel Consumpion g/kw* h 258.4
                          LUBE CONSUMPTION g/kw h 2.04
                          Compression ratio 18.0:1

                          Hi, please help me I need to know what is the fuel consumption in litres for the above specs

                          Comment


                          • #14
                            Re: g/kwh to gal/h

                            Originally posted by Unregistered View Post
                            Rated Power kva 20
                            Max power kva 22.5
                            PHASE three
                            Frequency (HZ) 50HZ
                            Rated voltage (V) 220~240/110~120;400/230V
                            Rated Current (A) 34.7A
                            Bore*Stroke 100x115
                            Displacement(L) 3.61
                            12h Power kw(ps) 26.5
                            Fuel Consumpion g/kw* h 258.4
                            LUBE CONSUMPTION g/kw h 2.04
                            Compression ratio 18.0:1

                            Hi, please help me I need to know what is the fuel consumption in litres for the above specs
                            Lets assume power factor = 1, so rated power is 20 kW. At 20 kW, fuel consumptuion is
                            20 kW x 258.4 g/kWh = 5168 g/h or 5.168 kg/h
                            Diesel varies, but 0.84 kg/l is a good typical figure for #2 diesel, so
                            5.168 kg/h x 1 L/0.84 kg = 6.15 L/h

                            Comment


                            • #15
                              Re: g/kwh to gal/h

                              I need to conver 320g/kW.h into L/hr for a diesel generator 13kVa , at 50Hz with an output voltage of 230V.

                              Comment

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