Brake Specific Fuel Consumption

Brake specific fuel consumption

The Brake-specific fuel consumption (BSFC) of a diesel engine is 200 gm/kWh.

What is BSFC and ISFC?

Brake-specific fuel consumption (bsfc) and indicated specific fuel consumption (isfc) is the specific fuel consumption on the basis of brake power (bp) and indicated power (IP) respectively.

What is meant by specific fuel consumption?

We then define specific fuel consumption (SFC) as the quantity of fuel burned in unit time required to produce a given engine output. SFC is a technical figure of merit that indicates how efficiently the engine converts fuel into power.

How do you calculate fuel consumption from specific fuel consumption?

The following formula is used to calculate fuel consumption in litres / 100kms, the most commonly used measure of fuel consumption.

1. Calculation. (Litres used X 100) ÷ km travelled = Litres per 100km.
2. The data you need for this calculation is. Odometer at 1st fuel fill eg 1000km.
3. Example a car uses 65 litres to travel 500km.

How do you calculate brake specific fuel consumption?

The BSFC calculation (in metric units) Commonly BSFC is expressed in units of grams per kilowatt-hour (g/(kW⋅h)). The conversion factor is as follows: BSFC [g/(kW⋅h)] = BSFC [g/J] × (3.6 × 106)

How is SFC fuel consumption calculated?

If the TSFC = 0.5, and we need 5000 pounds of thrust for two hours, we can easily compute the amount of fuel required. For example, 5000 pounds x 0.5 pound mass/hour/pound x 2 hours = 5000 pound mass of fuel.

Is higher BSFC better?

Therefore, the lower the BSFC number, the more efficient the engine is and the better the fuel economy will be. Typically, the lowest numbers will appear at or near peak torque. Since horsepower numbers change at any given RPM, the BSFC will be different at every given RPM/HP incremental.

Is high BSFC good?

It tells you how much fuel your engine will use per hour for each horsepower it makes. BSFC changes with engine load and rpm. A lower BSFC value is MORE efficient. Higher BSFC numbers are LESS efficient.

Why does BSFC increase with RPM?

2(c). The decrease in BSFC is due to the better physical and chemical properties of fuel which assisted in improving combustion at low engine speeds. On the other hand, at high speeds, the friction heat losses occur and combustion deteriorates which increases the BSFC.

What affects specific fuel consumption?

SFC varies with throttle setting, altitude, climate. For jet engines, air flight speed is an important factor too. Air flight speed counteracts the jet's exhaust speed.

What is brake engine efficiency?

Brake thermal efficiency is a measure of the fuel efficiency of internal combustion engines. The higher the brake thermal efficiency, the lower the fuel consumption, and greenhouse gas emissions.

Is a higher or lower specific fuel consumption better?

The guide gives model-specific fuel consumption information about light-duty vehicles. Remember, the lower the litres per 100 kilometres (L/100 km) rating, the better the fuel consumption. And the higher the miles per gallon (mpg) rating, the better the fuel use.

How do you calculate specific consumption?

Generally, SEC is calculated by dividing the amount of energy used with the amount of products.

What is brake power formula?

The power developed by an engine at the output shaft is called brake power and is given by Power = NT/60,000 in kW where T= torque in Nm = WR W = 9.81 * Net mass applied in kg.

Is SFC and TSFC same?

The mass of fuel required to provide net thrust for a given period (e.g. lb/(hlbf) (pounds of fuel per hour-pound of thrust) or g/(skN) for thrust engines (e.g. turbojets, turbofans, ramjets, rocket engines, etc.) is referred to as TSFC or SFC for thrust engines (e.g. turbojets, turbofans, ramjets, rocket engines, etc

What is the calculation for brake efficiency?

Brake Efficiency Formula To calculate brake efficiency, divide the total vehicle weight by the brake effort, then multiply by 100.

How much fuel is consumed when using engine braking?

On virtually all modern vehicles with electronically controlled fuel injection the answer is zero. The injectors are disabled when coasting (foot off the gas pedal).

What is the meaning of Bmep?

Brake Mean Effective Pressure (BMEP) is essentially the average pressure forcing the pistons inside your engine down that provides the measured torque output.

How do you calculate HCV of fuel?

1. Engineering Chemistry.
2. ∴ N.C.V = G.C.V.
3. k.cal/kg (or)
4. = G.C.V – 0.09H × 587.
5. The calorific value of a fuel can be determine by using.
6. A known weight of the fuel is completely burnt in a bomb.
7. calorimeter and the net rise in temperature of the known.
8. weight of water in the calorimeter is measured. From this.

How much fuel does an C 17 burn per hour?

The C-17, for example, can burn about 20,000 pounds of fuel an hour, depending on the maneuvers.

11 Brake specific fuel consumption Images