-Mike Vs = swept volume = area of cylinder * stroke length or bore * stroke. Horsepower = (P x L x A x N) ÷ 33,000. Indicated Horsepower=P*L*A*N divided by 33,000 (the number foot pounds per minute determined by James Watt) P=Pressure PSI L=Inch of stroke (double if double acting)[this what I was told by a old navy steam engine operator] A=Area in square inches of the face of the piston N=Number of strokes per minute. DIN 66036 describes one metric horsepower because the power to increase a mass of 75 kilograms contrary to the force of gravity over a precise distance of one meter that is covered in one second is equivalent to 98.6% of metric horsepower. Horsepower (hp) is a unit of measurement of power, or the rate at which work is done. We have often compared indicated power (using the PLAN formula) and brake horsepower for steam engines, now we can do a similar comparison for internal combution engines. You’ll mostly find it in use when you talk about cars. The term was adopted in the late 18th century by … Two common definitions being used today are the mechanical horsepower (or imperial horsepower), which is about 745.7 watts, and the metric horsepower, which is approximately 735.5 watts.. 1.Indicated power of a Four-stroke Engine • I.P.= Pm L A N KW 60000×2 Pm=Actual Mean Effective pressure,N/m2 L=Length of stroke,m A=Area of cross section of the cylinder,m2 N=RPM of engine crankshaft 6. The thermal efficiency is sometimes called the fuel conversion efficiency, defined as the ratio of the work produced per cycle to the amount of fuel energy supplied per cycle that can be released in the combustion process. HORSEPOWER COMPUTATION. Where: P = cylinder pressure (MEP) in pounds per square inch (psi) L = length of the stroke in feet (stroke ÷ … P - indicated mean effective pressure. Gen-erally, you lose about 0.5 percent of power for each bearing, so—with one or two shaft bearings—the true power the pro-peller sees is about 96 percent of brake horsepower … N - number of power strokes per minute. Typically the ratio of EHP/IHP is about 1:2 (or EHP is 50% of IHP). … The mean effective or average pressure [Pm] can now be used to determine the workdone in the cylinder. For example, the horsepower of a 230v motor pulling 4 amps and having 82% efficiency would equal 1 horsepower. Indicated Horsepower (IHP) is the power required to drive a ship at a given speed, including the power required to turn the propeller and to overcome any additional friction inherent in the system. Hope this helps. The power developed by an engine depends upon the type of engine as well as the speed of the engine. Indicated horsepower may be said to be the power developed in the combustion chambers without reference to friction losses within the engine. Following calculations can be made to the area of indicator diagram to measure indicated power. There is another Horsepower formula related to the weight given as. General Engineering Reviews Engineering Applications and Design. Favorite Answer. Lv 4. Unlike Diesel-electrics, where maximum horsepower is fairly constant, steam locomotive horsepower continues to increase with speed until the capacity of the boiler to produce steam is equalled by the ability of the cylinders to consume it. Abbreviation: ihp, IHP See more. L - length of stroke. K - number of cylinders. One Horsepower equals to 33,000 lb. Cheri. 2 decades ago. Formulas for brake horsepower horsepower = rpm x torque / 5252 torque = 5252 x horsepower / rpm brake specific fuel consumption = fuel pounds per hour / brake horsepower bhp loss = elevation in feet / 1000 x 0.03 x bhp at sea level Formulas for indicated horsepower & torque horsepower = mep x displcement x rpm / 792,00 It is normally indicated by various units such as PS, cv, hk, pk, ks, and ch. The following tables define equations for four stroke reciprocating engines. Answer Save. Indicated horsepower definition, the horsepower of a reciprocating engine as shown by an indicator record. Horsepower (HP) = (Torque × Speed)/5252. Brake Horsepower Yu Weiran(33) 1A3 Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. How does it work? Reciprocating Engine Formula Equations 4-Stroke. With the bore and stroke known (available in engine manufacturers’ technical manuals), the horsepower (hp) can be computed. That's weak!! Relevance. If you continue browsing the site, you agree to the use of cookies on this website. A metric horsepower is 98.6% of the Imperial mechanical horsepower. Horsepower formula is given as. 6 Answers. The power developed in the cylinder can then be found by adding the friction horsepower to the brake horsepower. Indicated horsepower definition: the power output of a piston engine calculated from the mean effective pressure in the... | Meaning, pronunciation, translations and examples N = n for 2 stoke engine and n/2 for 4 stroke . This mean height, when multiplied by the spring scale of the indicator mechanism, gives the indicated mean effective pressures for the cylinder. Power BHP = PLAN/33,000 P is brake mean effective pressure, in PSI L is piston stroke, in feet The horsepower of steam locomotives is rarely expressed because it is really not relevant to the job a particular locomotive can do. ihp: Indicated horsepower or gross horsepower (academic capability of the engine) minus frictional losses within the engine (bearings drag, rod and crankshaft windage losses, oil film drag, etc. Brake Horsepower (BHP) is the maximum power generated by an engine at a given RPM (The rpm of the engine is converted to the number of power strokes per minute.) Indicated Horsepower The power developed within a cylinder can be calculated by measuring the imep and the engine speed. If we know the cylinder pressure we can calculate the indicated horsepower using a widely accepted formula called PLAN. INDICATED HORSEPOWER is the theo- retical power that an engine would deliver if all frictional losses were eliminated. Multiply the voltage, the current, and the efficiency, then divide the result by 746. INDICATED HORSEPOWER . Horsepower in general is just another unit for power. In reality, this isn’t true shaft horsepower. A device called an engine indicator measures the theoretical power by creating a plot between the pressure and volume curves inside the cylinders. What is the PLANK formula for determining horsepower? IHP = PLANK/33,000. I’m only mentioning this because the difference of bhp and hp is in the same category and sometimes car manufacturers use different definition of hp depending on where the engine came from. Indicated efficiency is derived from measurements taken at the flywheel. There is still an-other source of loss due to friction—the shaft bearings. The total horsepower lost in overcoming friction must be subtracted from the indicated horsepower to arrive at the actual horsepower delivered to … Indicated Horsepower Now, assuming you know how an engine works; you have air and fuel mixed within the cylinder of an engine.
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