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  • Guest's Avatar
    Guest started a topic g/kwh to gal/h

    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+

  • JohnS
    replied
    Originally posted by anoush farzad View Post
    How about 3 phases generators? i need to convert 200 g/kWh to L/h in this generator plz help me.
    613 kW 1500 rpm 220 V
    Any help would be great.
    Only valid when actually outputting the rated power:

    613 kWh/h 200 g/kWh = 122.6 kg/h fuel consumption

    Divide by density of fuel. If diesel, density will be near 0.84 kg/L, so 146 L/h

    Fuel consumption will be less when output is less than rated power.

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  • anoush farzad
    replied
    How about 3 phases generators? i need to convert 200 g/kWh to L/h in this generator plz help me.
    613 kW 1500 rpm 220 V
    Any help would be great.

    Last edited by anoush farzad; 09-30-2015, 10:18 PM.

    Leave a comment:


  • Guest's Avatar
    Guest replied
    Re: g/kwh to gal/h

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

    Leave a comment:


  • Guest's Avatar
    Guest replied
    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....

    Leave a comment:


  • JohnS
    replied
    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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  • Guest's Avatar
    Guest replied
    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

    Leave a comment:


  • Guest's Avatar
    Guest replied
    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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  • Guest's Avatar
    Guest replied
    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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  • JohnS
    replied
    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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  • Guest's Avatar
    Guest replied
    Re: g/kwh to gal/h

    how to compute kwh/liter?

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  • Guest's Avatar
    Guest replied
    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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  • Guest's Avatar
    Guest replied
    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

    Leave a comment:


  • Guest's Avatar
    Guest replied
    Re: g/kwh to gal/h

    Right you are. Thanks for the clarification.

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  • JohnS
    replied
    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.

    Leave a comment:

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