Here is why the math doesn't work: Say your motor makes 350 FWHP, and you calculate a 12% loss. (A flywheel is a disc with teeth on it. The concept of Flywheel to be used as a energy storing device is … Hence, while purchasing a spin bike, anything that matters the most is the flywheel … Metric horsepower to kilowatts. The flywheel consists of a heavy circular disc or wheel with a strong axle mounted on ball bearings on two fixed supports.The wheel can be rotated in a vertical plane about the horizontal axle.It is used to determine the moment of inertia. This, of course, does not take into account any of the vehicle drivetrain or accessories, such as the fan, alternator, power steering, etc. Currently, high-power flywheels are used in many aerospace and UPS applications. Calculate the (free static) wheel radius from the tire size marking. Result will be displayed. Brake Horse Power (bhp) This is the power output of any engine measured at the engine's flywheel. If we measure w in revolutions per second then the stored energy of a flywheel is approximately 6MR 2 x w 2 (RPS) For M=140 kg and R=50cm this yields a required w of 500 RPS or 30,000 RPM ... Everything is the same except the weight, it is now 15 pounds or 240 ounces. … just changing the diff oil can effect power output measured at the wheels. So the power conversion of horsepower to kilowatts is given by: P (kW) = 0.73549875 ⋅ P (hp) Example. A flywheel should be extremely smooth and flexible with its movements in order to implement the required outputs. The calculated wheel radius is r w = 0.33965 m. Step 2. Flywheel and Shaft Torque Analysis. with that said, now add 307.85 horsepower plus 17.5 % and you come up with 361.72 HP at the flywheel. Just take an example of Potter’s wheel and think what it does. But at the same time there is a misconception of “FREE ENERGY”. Flywheels are used in most combustion piston engines. kW (kilowatt) is how much power the engine makes when strapped to an engine dyno. Solution: Step-1: Coefficient of fluctuation (C s) calculation. People who think they are making say 30% more at the fly than they are getting at the wheels are most likely being wildly optomistic at higher power levels. The technique of energy storage using Flywheel is thousands of years old. Flywheel has a conversion efficiency of 80% Flywheel must therefore store 21/.8 = 26.25 KWH Kinetic Energy goes as 1/2*I*w 2. Ignoring transmission losses, if we know that a car has 200lbft @ 5000rpm at the flywheel, and 2nd is geared to 10mph per 1000rpm, we should be able to calculate the torque at the rear wheels … I havent bothered to run my BA_GTp on my dyno cause i know what the reading in rear wheel kilowatts will be and i just cruise around with mine but just for arguement sake i will this week and again i will pridict (guess the rear wheel kilowatts cause i'm assuming from the factory it has 290 flywheel kilowatts eg. flywheel(SI units !) The flywheel weight also plays a vital role in controlling the resistance and inertia of the bike. 1. In first part of the flywheel design calculation tutorial example, we saw about calculating required mass moment of inertia for a particular application.. Flywheel design doesn’t stop with that. Today 2 kW/6 kWh systems are being used in telecommunications applications. This inertia includes the flywheel inertia and the inertia of all rotating parts, referred to the flywheel speed by multiplying by the square of the ratio of the shaft speeds. drivetrain mass, transmission type, friction/oil type all effect output. It is done with the help of gravity wheel. Please calculate the torque of 67000 kg torus ring flywheel with 3 meters in diameter and max 6000 rpm within 10 seconds and calculate the torque of the 1000 kg weight of 1500 KW generator rotor with 1000 rpm and 0.15 m³ cylinder area, there by the calculations … The method for calculating the wheel radius is described in the article How to calculate wheel radius. Usually the power losses are measured (in kw) on overrun and added back to the wheel figures to give flywheel figures. Take the example of a bicycle hind wheel, it is heavily enhanced with ball bearing to make its movement as smooth as possible and that’s why after a few paddling we are able to enjoy a free ride for quite sometime. First-generation flywheel energy-storage systems use a large steel flywheel rotating on mechanical bearings. the car will start at rest at a ramp between 30 to 50 degrees slope. Convert 10 hp to kW: P (kW) = 0.746 ⋅ 10hp = 7.460 kW . E f = 1/2 I ω 2 (1) where Energy is stored mechanically in a flywheel as kinetic energy. This is 2655/746 = 3.56 horsepower-seconds. The flywheel helps to maintain a smooth and safe operation during your workout. Using that flywheel calculator we find we used 2655 joules. Kinetic energy in a flywheel can be expressed as. In any case the only really useful figure is the one you are making at the wheels v the last figure you were making at the wheels on the same dyno. In order to get the said 308 HP, I calculated up from 14% to 17.5% to arrive at 307.85 from the dyno's read out of 262 hp + 17.5% = 307.85 actual Horsepower at the rear wheels. power at the wheels is effected by so many different things that there is no way to calculate flywheel HP from rear wheel HP. The engine’s power is usually reduced by 25%-45% depending on many different variables. However, if you test a car on a chassis dyno, put down 308RWHP, and figure a 12% gain to calculate FWHP, that would be 344.96. So basically, i'm making a vehicle that should regenerate energy from braking. Its size, shape and material density / mass and maximum stresses are also to be taken into account while designing a flywheel. Enter your values: Units: Metric (grams, mm) English (ounces, inches) Mass: It just uses the inertia of wheel and keeps on rotating with minimum effort. The overall study is done with various parameters of flywheel to obtain the maximum free energy output (4.167 kW= 5kW) of the system. RWkW (rear wheel Kilowatt) is how much power is put to the rear wheels, as in "Bro, my sick VL makes 500kW at the rears!" A flywheel mounted on a relatively stiff shaft is shown in Fig. WHP (Wheel Horsepower): Unlike BHP, WHP is the power output measured at the wheels of the vehicle and not the flywheel. One metric horsepower is equal to 0.73549875 kilowatts: 1 hp(M) = 735.49875 W = 0.73549875 kW. Since it is a small machine, diameter of the flywheel should be as small as possible. Flywheel & Rear wheel kW difference. Now the autors have calculated k­ a. ... an aluminum wheel barely makes a perceptible change over a steel flywheel. An 11% driveline loss is assumed for Wheel HP. Rear-wheel horsepower is measured at the rear wheel of the vehicle on a chassis dyno. Review of Free Energy Generator using Flywheel – Mechanical Project Abstract— Most of the new technologies were discovered with time which led a serious change in the perception of electric energy. P 1 .. kW Power indicated of compressor n ••• rpm speed k ••• kg.m 2 /kW.min3 constant factor Equ(l) is widely used for the calculation of the flywheel of IC engines and one can find the corresponding k values in the manuals. One kilowatt is 1.341 horsepower. A typical system consists of a flywheel supported by rolling-element bearing connected to a motor–generator.The flywheel and sometimes motor–generator may be enclosed in a vacuum chamber to reduce friction and reduce energy loss.. This calculator is not adjusted for atmospheric conditions. Last edited by Apocalypse; 2013/10/17 at 10:42 AM . U = 0.5 J ( ω 2 max - ω 2 min) Polar-mass moment of inertia Fly Wheel. 290 fwkw times 30% = 87kwatts The gravity wheel or flywheel is coupled with the gear-train in order to produce more extra energy or free energy. For flywheels I =1/2MR 2. Considering the equilibrium of torques, eq1. This is the engine’s performance influenced by the vehicle and environment. A flywheel can be used to smooth energy fluctuations and make the energy flow intermittent operating machine more uniform. Energy equation variation flywheel. This calculator provides the flywheel horsepower from the elapsed time and weight of the vehicle. Your drivetrain friction can change incrementally between two runs so back-calculating flywheel horsepower from measured wheel horsepower is … Enter value and click on calculate. The value is given as, C s =0.02 Calculate the mass moment of inertia required for the flywheel of the punching press machine. Kinetic Energy. where, T i = driving or input torque (N-m) T o = load or output torque (N-m) I = mass moment of inertia of flywheel (kg-m 2) ω = angular velocity of shaft (rad/s) (dθ/dt) Fig. there is NO exact formula. This calculator estimates your 60 foot, eighth and quarter mile elapsed times and trap speed when given the weight of the car and flywheel or wheel horsepower. See my Free Android Drag Racing Calculator App in the Google Play Store The weight of the flywheel limits the rotation. I did want to find out the flywheel kW after a mod because then you can brag about that :flip: . This 1/4 mile calculator uses the rear wheel horsepower instead of flywheel horsepower to determine the times and speed of the run. some people say "it makes 300kW at the flywheel" which is the same thing. Calculate the wheel torque using equation (6). Dude, flywheel horsepower is measured at the flywheel of the engine on an engine test stand or dyno. That would mean RWHP should be 308. Consider 500mm to be the max size of the flywheel dia. The amount of energy that can be stored in a flywheel is a function of the square of the RPM making higher rotational speeds desirable.
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