# Diesel engine load calculation

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Gmax = ( (N 2 x L)/2189) x (1 + 1/ (2A)) Gmax is maximum piston acceleration, in feet per second squared. N is crankshaft speed, in RPM. L is stroke, in inches. A is the ratio of connecting rod length, between centers, to stroke. Piston Stroke Motion. So, the baseline of our formula for calculated load at idle is 3.4 grams per second (current airflow) divided by 10.35 grams per second (max airflow) equals 33%. In the last column we saw that normal CL readings at idle could be between 30% and 50%. Now let’s look at the barometric pressure/altitude compensator. Similarly, we can calculate the annual, weeks and daily load factor. The value of the load factor is always less than 1 because the value of average load is always smaller than the maximum demand. If the load factor is high (above 0.50), it shows that the power usage is relatively constant; if it is low, it means a high demand is set. Brake-specific fuel consumption (BSFC) is a measure of the fuel efficiency of any prime mover that burns fuel and produces rotational, or shaft power. It is typically used for comparing the efficiency of internal combustion engines with a shaft output. So, the baseline of our formula for calculated load at idle is 3.4 grams per second (current airflow) divided by 10.35 grams per second (max airflow) equals 33%. In the last column we saw that normal CL readings at idle could be between 30% and 50%. Now let’s look at the barometric pressure/altitude compensator. Usually load is calculated using a throttle position sensor (reads throttle position input from driver). A more accurate way of measuring load is by reading the MAP sensor (intake manifold absolute pressure). Do note this holds true only for petrol engines, which I have worked on. Diesels do not have an air throttle - they're fuel controlled. LOAD_ABS = [air mass (g / intake stroke)] / [1.184 (g / intake stroke) * cylinder displacement in litres] Derivation: air mass (g / intake stroke) = [total engine air mass (g/sec)] / [rpm (revs/min)* (1 min / 60 sec) * (1/2 # of cylinders (strokes / rev)], The most important thing to consider when sizing a generator is the high inrush currents associated with starting electric motors and transformers, which are typically six times the full load current. However, inrush currents for the type of high efficiency motors being specified today can be almost double that amount. Similarly, we can calculate the annual, weeks and daily load factor. The value of the load factor is always less than 1 because the value of average load is always smaller than the maximum demand. If the load factor is high (above 0.50), it shows that the power usage is relatively constant; if it is low, it means a high demand is set. The F-factor calculation method is used to calculate the hourly emission rate for NOx, CO, and POC emissions. Conversion factors used as part of the F-factor calculation method are presented in the next section. Other conversion factors assumed include: 453.593 grams per lb (g/lb) 7,000 grains per lb (gr/lb) 9.486E-04 Btu per Joule (Btu/J) Load Banks provide the best practical means for allowing the engine of diesel powered generator to operate at it’s . designed load and temperature ratings. Using a correctly sized load bank will prevent fuel system and emission issues that can affect diesel engine reliability and performance. LOAD BANK The Diesel Engine • Intake air not throttled – Load controlled by the amount of fuel injected >A/F ratio: idle ~ 80 >Full load ~19 (less than overall stoichiometric) • No “end-gas”; avoid the knock problem – High compression ratio: better efficiency • Combustion: – Turbulent diffusion flame – Overall lean Mar 05, 2008 · I am actually looking at purchasing a pair of CAT 3412E (E rating) engines and would like to get some guidance and pointers in how to calculate the load factor for the engine? It is mentioned in the engine conditions and definitions to use it upto a 30% load factor. Future Load Expansion in % Average Intermittent Use of Equipment (0.7 To 1.0) You are about to enter following information for each consumer you have in your consumption calculation: Equipment (name) Load Type (linear, non-linear or motor) Supply (1ph or 3ph) Qty (num.) Load (in kW) Starting P.F; Running P.F; Diversity Factor Power Calculators for quick electrical generator power consumption, sizing, and unit conversion. Convert kW to kVA, kVA to kW, voltage, kW to HP, and more to assist with generator sizing and electrical specifications required for your genset. Similarly, we can calculate the annual, weeks and daily load factor. The value of the load factor is always less than 1 because the value of average load is always smaller than the maximum demand. If the load factor is high (above 0.50), it shows that the power usage is relatively constant; if it is low, it means a high demand is set. Brake-specific fuel consumption (BSFC) is a measure of the fuel efficiency of any prime mover that burns fuel and produces rotational, or shaft power. It is typically used for comparing the efficiency of internal combustion engines with a shaft output. Listed below are the BSFC ranges for average efficiency Gas, E85 & Methanol engines at their peak hp output. An engine's BSFC can vary depending on load and RPM, these rates aim to represent the peak horsepower environment. The unit of measure here is lbs / hp / hr. Oct 29, 2010 · When I was referring the H/C ratio of the fuel I meant that in order to calculate the mass flow rate from the exhaust emissions it is needed. There are standard values that can be used for this, but that changes with the fuel (just because it is a diesel engine doesn't mean it is running on diesel alone). For accuracy, it is best to test. Load Banks provide the best practical means for allowing the engine of diesel powered generator to operate at it’s . designed load and temperature ratings. Using a correctly sized load bank will prevent fuel system and emission issues that can affect diesel engine reliability and performance. LOAD BANK engine load is usually directly obtained from the generated Abstract—The operating condition for medium-speed marine and power plant engines are usually described in terms of engine load and speed. Especially engine load is widely used for calculation of controller parameters and set points for both internal and external control circuits. will standardise the calculation. LOAD_ABS is the normalised value of air mass per intake stroke displayed as a percent. LOAD_ABS = [air mass (g / intake stroke)] / [1.184 (g / intake stroke) * cylinder displacement in litres] Derivation: — air mass (g / intake stroke) = [total engine air mass (g/sec)] / [rpm (revs/min)* (1 min / 60 sec) * (1/2 # of Jul 27, 2013 · What is the definition of "Engine Load" A lot of things I have read make reference to engine load but it is not clear if there are different meanings. One definition seems to be that the engine load is the amount of air flowing through the engine as a percentage of the theoretical maximum. The Manitowoc Company, Inc. - Global HQ One Park Plaza 11270 West Park Place Suite 1000 Milwaukee, WI 53224 Tel: (1) 414 760 4600 P = active electric power in output of the diesel engine in kW. h = number of hours per day the genset runs. d = number of days the power generator runs. Ckwh = Consumption of fuel per kWh (usual value is between 0.3 and 0.6 l/kWh) C = Consumption of fuel in liter. engine load is usually directly obtained from the generated Abstract—The operating condition for medium-speed marine and power plant engines are usually described in terms of engine load and speed. Especially engine load is widely used for calculation of controller parameters and set points for both internal and external control circuits. Engine load is measured by the MAF sensor. In other words, it measures how much air (and fuel) you're sucking into the engine and then compares that value to the theoretical maximum. When I modified my Subaru's fueling, boost and ignition maps, all the tables plotting engine load to RPM referenced engine load in CFM (Cubic feet per minute). Diesel engine power to Fuel Consumption table - Table based on fuel consumed at 240 g/kW hour. Power Unit. Fuel Consumption per hour; Naturally aspirated Engines. – Diesel engine peak heat flux ~ 10 MW/m2 • For SI engine at part load, a reduction in heat losses by 10% results in an improvement in fuel consumption by 3% – Effect substantially less at high load 15 SI Engine Heat Transfer • Heat transfer dominated by that from the hot burned gas • Burned gas wetted area determine by cylinder ... P = active electric power in output of the diesel engine in kW. h = number of hours per day the genset runs. d = number of days the power generator runs. Ckwh = Consumption of fuel per kWh (usual value is between 0.3 and 0.6 l/kWh) C = Consumption of fuel in liter.