For example, if you have topped up the tank with "X" liters of fuel and it has been consumed after traveling "Y" km of distance, you have to multiply Y with 100 and then divide the number with X to find out the car's fuel consumption rate per 100 km. Fuel consumption will be decreased at cruising speeds. 300-hp Diesel Engine Example GPH = (0.4 x 300)/ 7.2 = 105/7.2 = 16.6 GPH 300-hp Gasoline Engine Example View chapter Purchase book You get the value is Kg, But to specify in Grams you have to multiply the answer by 1000. The maximum time aloft is equal to the fuel load divided by the specific fuel consumption times the thrust (t max = M / (TSFC * F)). To plan the fuel costs, you multiply the relative fuel consumption value by the planned driving distance, and then you know the expected absolute consumption and thus also the fuel costs. *Emission factors in lb/hp-hr were calculated using emission factors in lb/MMBTU and a brake specific fuel consumption of 7000 BTU/hp-hr (AP 42 Table 3.3-1). Equation 1 defines water. IT CAN BE CALCULATED THEORETICALLY & PRACTICALLY:- 1. theoretically--- For this you must know the SFC (specific fuel consumption) of the engine at the given load. We then define specific fuel consumption ( SFC) as the quantity of fuel burned in unit time required to produce a given engine output. This parameter can be used for both external combustion engines and internal combustion engines, most often used for automotive engines. Approximate guide only, subject to change without notice. Fuel Consumption Chart. Finally the universal BSFC map (contour) is the best way to understand the whole and the best fuel consumption of an engine. At wide-open throttle, full load, and constant rpm (using race gas), the "chemically correct" baseline BSFC was some time ago considered to be 0.500 pounds of fuel flow/horsepower-hour. Thrust-specific fuel consumption ( TSFC) is the fuel efficiency of an engine design with respect to thrust output. On average, an in-tune four-stroke gasoline engine will burn about 0.50 pounds of fuel per hour for each unit of horsepower. Then calculate the remaining value in the tank and then divide the amount of fuel consumed by the number of hours. for example (let us consider. Now, you'll be able to calculate your car's efficiency, based on how you normally drive. The marine engine efficiency is usually determined using the SFOC. For example, if your vehicle has an 80-litre fuel tank and it uses 13.3L/100km (as in the example above), divide 80 by 13.3 and multiply by 100 and the result is a rounded range of 601.5km. We will now consider SFC for jet engines and piston engines separately. Specific Fuel Oil Consumption (SFOC): Specific fuel oil consumption is the measure of the mass of fuel consumed per unit time to produce per KW. Fuel consumption curves can be represented by the calculation of the BSFC (specific fuel consumption) index. Specific fuel consumption increases dramatically for approach at low power . SFC is a technical figure of merit that indicates how efficiently the engine converts fuel into power. As part of a project to convert a fleet of vehicles to natural gas, the evaluation of future energy . C = Consumption of fuel in liter Excel file to calculate genset active and apparent power and fuel consumption. (TSFC = mf / F ). Please note that these results are intended to be used to estimate how much fuel a generator uses during operation and are not exact metrics due to various factors that can affect the amount of fuel consumed. To convert the fuel consumption from [g/km] to [l/100 km] we need to take into account the density of the fuel. A key role in this calculation is played by the volume of the burnt fuel and the amount of operating oil, as well as the type of engine. The default values are for distance 200 km, volume 200 liter and consumption 10 liter/100 km. The fuel consumption rate for many makes of Diesel Engines can be found in a range between 0.380 & 0.450 lbs/hp hour; 172 & 181 grams/hp hour; 231 & 243 grams/kW hour. IN this video you will come to know how to calculate specific fuel consumption of engine. 1- Calculate generator fuel consumption by operating hours In this method, we can calculate generator fuel consumption per hour. Download Excel calculator for electric generator. Also, remember that engines with direct and electronic fuel injection will yield higher fuel efficiency. The marine engine efficiency is usually determined using the SFOC. To apply these formulas to your boat, just plug in its horsepower rating and multiply it by the specific fuel consumption average, then divide the product by the fuel specific weight. The specific oil consumption is calculated with respect to this volume and peculiarities of the operation. By filling the tank with a specific amount of diesel and running the generator for a certain period. Divide the distance travelled by the litres used and you will get the km/litre. 2. To calculate Fuel Consumption for a 400 hp Gas engine with a BSFC of .50 lbs/hp/hr: 400 hp x .50 = 200 lbs/hr . This makes fuel consumption assessable and predictable. This excel file will help you to calculate power and electricity production according to load, fuel consumption and cost of kWh from diesel or gas generator. How to calculate the fuel consumption of a car? Specific fuel oil consumption is the measure of the mass of fuel consumed per unit time to produce per KW. (1) The fuel consumption of auxiliary engine is calculated according to formula (5). Calculate the brake specific fuel consumption Tips to save fuel consumption of your home generator: Fuel consumption = Fuel used / Distance travelled The result depends on the metrics used as input: miles per gallon if the input was in miles and gallons, and km per liter if the input was in kilometers and liters. In this video i have in details about the Specific Fuel Consumption of IC Engine in Hindi language. Power Unit. TSFC may also be thought of as fuel consumption (grams/second) per unit of thrust (kilonewtons, or kN). per HP .40 lb. To calculate the specific consumption of the engine oil, the following data is necessary: This parameter reflects the efficiency of an internal combustion engine. Specific fuel consumption is the amount of fuel consumed by a vehic. Calculate the area of the piston Step 2. () 12 3 1 m ffififi i QQQQ = =++ (5) Wherein: Qfi1 The fuel consumption of auxiliary engine when the ship is sailing, in the unit of toe; Qfi2 The fuel consumption of auxiliary engine in non-self-unloading state when the ship is berthed, in the unit . Thus, in comparing the performance of a vehicle powered by a diesel engine against a vehicle powered by a natural gas . Specific fuel oil consumption= Mass of fuel consumed per hour/break power in that particular hour Detailed Specific Fuel Oil Consumption calculation for diesel engine SFOC Calculation SFOC = ( Co x D x 10^6 )/ (h x Pe) where: Co = Fuel oil consumption over the period (m^3) D = Corrected gravity (t/m3) h = Measuring period, hours The specific fuel consumption equals the mass flow rate divided by the thrust. To convert this lbs/hr to a more meaningful gallons per hour we use t he conversion rate from lbs to gallons which is 6.25 lbs to 1 gallon of gas Most of the parameters used by manufacturers of diesel generators use G/KW.H, which means how many grams (G) of oil is consumed by one kWh of generators, and then the unit is replaced by liters (L) to know you. Convert km/litre to L/100 km - divide 100 by km/litre. per HP FSW 6.1 lb. For the most accurate results, we recommend doing this . Given Horsepower x .50 lb fuel/hp = lbs of fuel for given horsepower. The formula (Corrected Density = Density at 150C X [1 - { (fuel temp (0C) - 150C) X 0.00065}]) should be used to obtain the corrected density at the recorded fuel temperature. In order to achieve accuracy, the fuel consumption and power developed is always measured over a suitable time period on a good weather. 7.2 lb per gal. Diesel engine power to Fuel Consumption table - Table based on fuel consumed at 240 g/kW hour. BDC for engine manuals and specs https://barringtondieselclub.co.za/ As engine . Calculate the engine brake (effective) power Step 5. On average, an in-tune four-stroke gasoline engine will burn about 0.50 pounds of fuel per hour for each unit of horsepower. BSFC = Mass flow rate(. An efficiency test for a diesel irrigation pumping plant compares the unit's generated water horsepower (power-out) to the rate that diesel is being consumed (power-in). You can also compare several fuel consumption values with each other and draw conclusions. SFOC = Mass of fuel / kW power in 1 hour. Calculate the cylinder capacity (volume) The total engine capacity will be: Step 3. brake specific fuel consumption, BSFC [g/kWh] Step 1. EMD engines, particularly, have an uneven specific fuel consumption curve because in the lower throttle notches, the engine has to drive the intake air blower, while in higher notches, the exhaust turbine takes . mf) Brake power(B. P.) Mass flow rate ( m f.) Brake power ( B. P.) The brake power of the engine can be found by connecting it to the brake dynamometer. A calculation table has been provided for this purpose in the excel worksheet. Fuel Consumption per hour; Naturally aspirated Engines. An efficient and GOOD set/system will have a Diesel Consumption of 206.28 gms/kW.Hr. Example of consumption per . Break specific fuel consumption example: It may also be thought of as power- specific fuel consumption, for this reason. Natural Gas, 4-Stroke Lean-Burn Engine Example: In the example provided below, calculations are provided for emergency and non-emergency 0.60 MMBTU/hr natural gas 4-stroke lean-burn engines. Calculate the engine brake (effective) torque Step 4. per gal. The fuel consumption formula is: X (fuel amount in liters) x 100 / Y (total distance in km) Again using algebra, (mf = TSFC * F ) Collecting all this information, we arrive at the final equation. The specific calculation of the fuel consumption of diesel generators is as follows: One liter of diesel is about 0.84-0.86 kg. It is thus thrust-specific, meaning that the fuel consumption is divided by the thrust. where fuel [kg/l] is fuel density. Then by using the following formula we can calculate the break specific fuel consumption of the engine. Specific Fuel Consumption (SFC) of marine engines ranges between 155 and 200 g/kWh on optimal load settings, mostly dependent on engine speed (low, medium, high) and type (two-stroke or four-stroke). Using Scilab we can compute the in-use (real world) fuel economy for the vehicle and engine parameters presented above. Please note that this diesel generator fuel consumption formula is intended to be used as an estimate of how much fuel a generator uses during operation and is not an exact representation due to various factors that can increase or decrease the amount of fuel consumed. as SPECIFIC FUEL CONSUMPTION at FULL LOAD. This is why it is recommended by ISO and SAE Standards. For petrol (gasoline) is 0.75 kg/l and for diesel is 0.83 kg/l. At No-Load the Diesel Consumption will be 10 to 10.2% of the Full Load consumption. The pros call it "brake-specific fuel consumption." This makes it important to know that gasoline weighs about 6.1 pounds per gallon and diesel fuel 7.2 pounds per gallon. This does not represent a big difference in fuel consumption per power unit between most normal naturally . Let us calculate SFOC with . TSFC = f / Fs Mass of fuel = Density X Volume. In order to achieve accuracy, the fuel consumption and power developed is always measured over a suitable time period on a good weather. Otherwise it is complicated, since you need to know the time spent in each notch setting during a trip to calculate fuel consumption. Formula To Estimate Maximum Engine Fuel Consumption Gallon Per Hour (GPH) = (specific fuel consumption x HP)/Fuel Specific Weight Constants Gas Diesel SFC .50 lb. Write down your distance travelled, and litres of fuel used. At 75% FULL LOAD the same good DG SET will have a SPECIFIC FUEL CONSUMPTION of 205.9 gms/kW.Hr. Use the chart below to estimate fuel efficiency. Fuel Consumption = (Final Mileage - Starting Mileage) / Fuel Usage Fuel Consumption = (23,889mi - 23,500mi) / 12.5 gallons Fuel Consumption = 389mi / 12.5 gallons Fuel Consumption = 31.1 mpg Method 2 Finding Average Fuel Consumption 1 Remember that fuel consumption changes based on your driving. Mathematically, TSFC is a ratio of the engine fuel mass flow rate mdot f to the amount of thrust F produced by burning the fuel: TSFC = mdot f / F If we divide both numerator and denominator by the engine airflow mdot 0, we obtain another form of the equation in terms of the fuel to air ratio f, and the specific thrust Fs . Thrust-specific fuel consumption. You can understand the ISFC, BSFC in easy language.specif. Simple really, the more power you produce the more fuel you use. This blog provides an overview of SFC curves for marine diesel engines. In traditional units, it measures fuel consumption in pounds per hour divided by the brake horsepower, lb/ (hph); in SI units, this corresponds to the inverse of the units of specific energy, kg/J = s 2 /m 2 . Calculating the fuel consumption of different types of natural gas engines compared with gas and dieselfuelled engines. The Fuel Consumption Calculator above approximates the fuel consumption of a diesel generator based on its size and operating load.
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