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  • #16
    Re: g/kwh to gal/h

    Originally posted by Unregistered View Post
    I need to conver 320g/kW.h into L/hr for a diesel generator 13kVa , at 50Hz with an output voltage of 230V.
    If we assume output is actually 13 kVA and power factor is 1 (worst case), it is 13 kW x 320 g/kWh = 4.16 kg/h As density of diesel fuel is around 0.85 kg/L, that is 4.9 L/h at max power. If at less than max output power, consumption will be somewhat less.

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    • #17
      Re: g/kwh to gal/h

      JohnS, in your last post you divided 4.16 by 0.85 to get 4.9. Shouldn't you have multiplied 4.16 by 0.85 to get 3.54............or am I mixed up?

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      • #18
        Re: g/kwh to gal/h

        Originally posted by Unregistered View Post
        JohnS, in your last post you divided 4.16 by 0.85 to get 4.9. Shouldn't you have multiplied 4.16 by 0.85 to get 3.54............or am I mixed up?
        4.16 kg/h x 1 L/0.85 kg = 4.9 L/h

        I recommend always leaving the units attached to the numbers and working the units cancellation; it is always clear whether to multiply or divide. You can still make errors by using wrong conversion factors, but it is much easier to check all the inputs to the calculation.

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        • #19
          Re: g/kwh to gal/h

          Right you are. Thanks for the clarification.

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          • #20
            Re: g/kwh to gal/h

            If a 500 kW diesel generator has a fuel consumption of 208 g/kWh at full load. How much it will be at 50% and 25% load? Thanks

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            • #21
              Re: g/kwh to gal/h

              may i know in the previous calculation whether you consider the efficiency already? i looks the genset has a round 50% efficiency.

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              • #22
                Re: g/kwh to gal/h

                how to compute kwh/liter?

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                • #23
                  Re: g/kwh to gal/h

                  Originally posted by Unregistered View Post
                  how to compute kwh/liter?
                  Measure the engine's power output (kilowatts) and fuel flow (liters per hour). Divide.

                  It varies with the heat content of the fuel and the efficiency of the engine. For a particular engine and fuel, it varies considerably with torque and rpm (the plot is called an engine map, and shows brake specific fuel consumption contours vs torque and rpm).

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                  • #24
                    Re: g/kwh to gal/h

                    There are 453.6 grams per pound.

                    230 g/kw hr = ( 230/453.6 ) lb/kw hr ~= 0.507 lbm/kw-hr

                    There are approximately 7.4 pounds / gallon for #2 D diesel fuel

                    0.507 lbm/kw-hr / 7.4 lbm / gal ~= 0.069 gal / kw-hr

                    If 60 kw, then hourly fuel oil usage ~= 0.069 x 60 kw ( kw drops out ) = 4.11 gal/hr

                    The reciprocal of "gal/kw-hr" i.e. "kw-hr/ gal" is a more used term of electric generator efficiency using diesel engines.

                    In this case 1 / 0.069 ~= 14.5 kw-hr / gal. a very competitive level.

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                    • #25
                      Re: g/kwh to gal/h

                      each KWh will consume 0.31 liters for small machines ( under 50 KVA ) , 0.26 to 0.28 for mid machines under 250 KVA , and 0.252 litres for large machines , for DS#2 fuel

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                      • #26
                        Re: g/kwh to gal/h

                        If a 2650 kW Main Engine has a fuel consumption of 210.2 g/kWh at full load. How much it will be at t/h ? Thanks

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                        • #27
                          Re: g/kwh to gal/h

                          Originally posted by Unregistered View Post
                          If a 2650 kW Main Engine has a fuel consumption of 210.2 g/kWh at full load. How much it will be at t/h ? Thanks
                          210.2 g/kWh x 2650 kW x 1 t/10^6 g = 0.557 t/h

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                          • #28
                            Re: g/kwh to gal/h

                            Originally posted by JohnS View Post
                            210.2 g/kWh x 2650 kW x 1 t/10^6 g = 0.557 t/h
                            Thank you....

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                            • #29
                              Re: g/kwh to gal/h

                              necesito convertir 235 g/kw.h en g/h cuanto es eso.

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