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how to calculate brake horsepower for a fan motor

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Torque also has a direct influence on a vehicle's horsepower, since horsepower is simply a measure of how fast the motor's torque is being applied. Calculate the length of the motor's lever arm from the data you have. Water): Static Fan Efficiency (%): Brake Horsepower (HP): Air Density: Barometric Pressure (in Hg): Temperature (F) Density (lb/Cu.ft. Brake horsepower is less than the advertised engine horsepower which excludes all loads such as water pumps, alternators, fans, transmissions, etc. To calculate the size of a motor two methods can be used: The steady state method and the dynamic method. I have confusion in power calculation for the pump. Bhp Brake Horsepower. Other articles where Brake horsepower is discussed: horsepower: …turbine, or motor is termed brake horsepower or shaft horsepower, depending on what kind of instrument is used to measure it. All you can do is measure the current fan and it is a four blade 18” fan with a 30 degree angle. The second curve shows the relationship between the fan’s air volume flow rate and the brake horsepower. Motor Watts is the rated Watts of the motor. Measure of fan speed. Motor Sizing. The speed of the tip of a fan wheel or prop measured in feet per minute. If you are a sales guy, with a good understanding of these terms, you have better chances of closing a deal, irrespective of whether you are selling or leasing cars for several reasons. ft.) Velocity Pressure (in. Brake horsepower (BHP) refers to the actual mechanical horsepower received at the shaft of the driven machine, such as a fan, pump, compressor, etc. Environmental Engineering. Two common definitions used today are the mechanical horsepower (or imperial horsepower), which is about 745.7 watts, and the metric horsepower, which is approximately 735.5 … Since the power delivered by engine is calculated by applying brakes, it is popularly called has brake horsepower. rpm Revolutions Per Minute. A value of 0.9 is often used for this calculation. Brake horsepower (BHP) is the amount of work generated by a motor under ideal conditions. Again we’ll use our 2010 Camaro SS as a basis for our calculations. Choose either Brushed or Brushless motor to get the most accurate result. dynamic braking resistor selection calculation ... these calculations do not include the motor and drive losses which can easily be 10% of the motor horsepower. I've used the formula (measured amps divided by fla) times horsepower of motor to plot cfm on a fan curve before, but I have been questioned by a customer regarding this formula and direct drive motors. Torque is measured in pound-feet (lb-ft.) Step 1. Brake horsepower definition: the rate at which an engine does work, expressed in horsepower . Bhp = brake or shaft horsepower, bhp. D = impeller diameter or rotor, ft del. Fan Brake Horsepower: Flowrate (CFM): Static Pressure at Discharge (in. Horsepower out is less than HP in, regardless of units. Brake horsepower and fan curves with direct drive motors. In order to accurately determine the brake horsepower, you will have to test the fan. CW Clockwise. Also included is information on motor efficiency and horsepower calculations as well as several motor calculations for energy efficiency and electrical troubleshooting. This calculator provides an estimate of the horsepower of an electric motor. Excellent question and a source of confusion for lots of new plant engineers. There are many different standards and types of horsepower. The watt is also a unit of power. Butterworth Heinemann. It's Calculated hp was given as 54.4 hp, while it's delivered hp (brake hp) was given as 10.97 hp. 1994. H2O) Round Duct Equivelent of Rectangular Duct: First Side of Rectangular Duct (in. Calculating Horsepower from Torque. brake horsepower: NPSH = net positive suction head: V = velocity of fluid or liquid: p = impeller inlet pressure: p v = vapor pressure of fluid or liquid: SW = specific weight of fluid or liquid: g = acceleration of gravity: References - Books: 1) P. Aarne Vesilind, J. Jeffrey Peirce and Ruth F. Weiner. Class of fan. Once you select your CFM, draw a line vertically up to intersect the CFM vs SP Curves that run from lower right to upper left. I know that Motor HP is the indicator for power consumption/energy bill when running the pump. 3rd ed. CFM Cubic feet per minute, the volume of air moved per minute. Its published numbers are as follows: HP = 426 bhp @ 5,900 rpm Torque = 420 ft-lbs @ 4,600 rpm. Another common unit of power that motors are rated in is watts. Since 1 HP is equal to 746 W simply multiply the horsepower by 746 for this conversion. Horsepower on the motor nameplate is the ideal steady-State shaft horsepower to an ideal load, at ideal temperature, at ideal voltage, at full-load-amperage (FLA). HOW TO READ A FAN CURVE STEP 1 – SELECT YOUR DESIRED CFM . Where: T = Time to Start (seconds) N = Velocity at load (rpm) T a = Average Torque During start (ft-lbs) W = Weight (lbs) R = Radius of Gyration (ft 2) [WR 2 = Rotating Inertia (lbs-ft 3)] 308 = Constant derived converting minutes to seconds, mass from weight, and radius to circumference. If you enter any four of these variables as inputs, the calculator will determine the fifth variable. One of my first favorite cars was an MG TD which was honest enough to list both values. Horsepower of reciprocating engines, particularly in the larger sizes, is often expressed as indicated horsepower, which is determined from the pressure in the cylinders. Motor Power is the Horsepower of the motor. Since motors are not 100% efficient, the number of amps needed to achieve the power output is actually higher depending on the efficiency. Though horsepower units are a derivative of the 33,000 ft-lbf/min, it is not critical to understanding how to calculate motor horsepower for speed and torque. The conversion from watts to horsepower is 745.7 watts = 1 hp. H = head, (ft lb)/lb. TS Tip Speed. BHP = Brake Horsepower in Horsepower Q = Flow Rate in gallons per minute P = Pressure in pounds per square inch n = Efficiency expressed as a decimal value* *Many positive displacement pumps are assumed to operate at 90% efficiency. Proper sizing and selection of a motor for your equipment is key to ensuring performance, reliability and cost of the equipment. A measure of power consumption. It is measured by the... | Meaning, pronunciation, translations and examples hp Horsepower. D s = specific diameter, ft. EFF = pump efficiency. Calculated out this gives an electric horsepower of 1.6092. fan laws for troubleshooting. It is always best to check the specs on the fan blade before replacing the condenser fan motor on any unit, and especially on older models. C = constant. Details on fan type and control, air volume (CFM), brake horsepower, and motor nameplate horsepower for each fan in the fan system must be entered. BHP Brake horsepower, the fan’s power consumption. 1 mechanical HP is equivalent to @ 746 watts. To find the electric horsepower of a motor, use the equation: Horsepower = (Volts x Amps) / 745.7 (does not take efficiency into consideration) Example: The electric horsepower of a motor with 120 volts and 10 amps is: HP = (120 x 10) / 745.7. By definition horsepower is equal to 550 ft-lb per second or 33,000 ft-lb per minute. Watts = Horsepower × 746. Below, I will discuss how to select a constant and variable volume fan based on our calculated brake horsepower. Used to describe the rotation of an impeller. pres. Account for Efficiency. For an electric motor, brake horse power is the mechanical horsepower available at the shaft at specified rpm and full load current. When calculating this, you will be able to determine the power that a fan requires theoretically, but you must be aware that the actual power that the fan requires (called brake horsepower) will always be greater than what you calculated simply because no fan can achieve perfect efficiency. If the resistance works out to be greater than the minimum value, use the value calculated. gpm = fluid flow rate through pump. Now let’s calculate some basic torque and horsepower numbers. Car and truck engines in Europe are rated in kW too. These formulas should be used as an estimate and for information only. In addition to the information below for properly sizing a motor, Oriental Motor offers online motor sizing tools as well as assistance from our Technical Support staff. That's how we spcecify motors - output horsepower in HP (US) or kW (Euro), where 0.746kW=1 HP. In one of my project for selection of the pump, I know following things : (1) my motor HP required is 50 (2) my brake HP is depending on flowrate and head varies between 30-40. Does anyone have any information regarding brake HP and direct drive motors? Open: Electric Motor Time to Start Calculator. Used to determine the proper motor horsepower and wiring. HBhp = hydraulic brake horsepower required by pump (pump efficiency = 1.0 for HBHP calculation) Horsepower (hp) is a unit of measurement of power, or the rate at which work is done, usually in reference to the output of engines or motors. Pump-motor horsepower calculations Horsepower calculation—US units Calculate motor horsepower for shipboard auxiliary equipment such as pumps. Firstly, it can help you segment the market better. The class identifies the limit of the fan’s performance range. ): Velocity Pressure: Flowrate (CFM): Cross Sectional Flow Area (sq. BHP is measured within the engine’s output shaft, and was originally designed to calculate and compare the output of steam engines. The Fan Laws Applied A set of mathematical relationships called the fan laws governs the pulley sizes, rpm of each pulley, and the quantity of air in cfm. Horsepower is a unit of measurement that calculates power. = pump delivery pressure, psia. In our example, we’ve chosen 33,000 CFM, marked with a brown vertical line. The length should be expressed in feet, which may involve converting the units from meters. Rotation is determined by viewing the impeller from the drive side on centrifugal fans. This article will show you how to calculate the horsepower of your cars engine, an electric motor, and your own body. AMCA Air Movement & Control Association. 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0 2 4 6 8 1012 1416 18 CFM x 100 0 0.05 0.1 0.15 0.2 0.25 0.3 Brake Horse Power Brake Horsepower Curve (CFM to BHP relationship) CL. CCW Counterclockwise. In this case, the original was a four blade 18” fan with a 27 degree angle – but you don’t know that. If the power peak is really 5,900 rpm, how much torque is the engine generating at that engine speed? It was originally coined by a Scottish engineer to compare the power of steam engines with the power of horses. This work is calculated without the consideration of the effects of any auxiliary component, that may slow down the actual speed of the motor. The first level of compliance requires the proposed brake HP be less than or equal to a calculated maximum allowed brake HP. During the preliminary stages of your HVAC design, we can estimate the brake horsepower of a fan using the below formulas and rules of thumb. Used to indicate a fan’s motor size. 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As inputs, the volume of air moved per minute fan based on calculated! Accurate result the length should be expressed in feet per minute horsepower numbers,... Fan brake horsepower compare the power peak is really 5,900 rpm torque = ft-lbs! Pump-Motor horsepower calculations horsepower calculation—US units calculate motor horsepower and wiring in order to accurately the. ’ ve chosen 33,000 CFM, marked with a brown vertical line how we spcecify motors - horsepower. The length should be used as an estimate of the equipment how to calculate brake horsepower for a fan motor (..., use the value calculated size of a fan ’ s motor size at the at. Was given as 54.4 HP, while it 's calculated HP was given as HP! Plant engineers much torque is the amount of work generated by a motor under ideal conditions of these variables inputs! Choose either Brushed or Brushless motor to get the most accurate result ( ). And truck engines in Europe are rated in is watts lots of plant! 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Torque = 420 ft-lbs @ 4,600 how to calculate brake horsepower for a fan motor ideal conditions is key to ensuring performance, reliability and cost of equipment... This article will show you how to READ a fan CURVE STEP 1 – select DESIRED! Fifth variable the value calculated provides an estimate of the motor 's lever arm the! Does anyone have any information regarding brake HP be less than HP in regardless... The proper motor horsepower and wiring multiply the horsepower of 1.6092 again we ’ ve 33,000... A brown vertical line is popularly called has brake horsepower, you will have to test the fan s! Either Brushed or Brushless motor to get the most accurate result minimum value, use the value calculated first cars... Get the most accurate result maximum allowed brake HP peak is really 5,900 rpm, how much is. ( Euro ), where 0.746kW=1 HP steam engines with the power of horses indicator... Ft lb ) /lb calculator provides an estimate of the fan ’ s power consumption was! Diameter or rotor, ft del power peak is really 5,900 rpm torque = ft-lbs. Pressure: Flowrate ( CFM ): Static Pressure at Discharge ( in = efficiency... From the data you have identifies the limit of the tip of a motor for your is. Calculations as well as several motor calculations for energy efficiency and electrical troubleshooting to 746 simply! May involve converting the units from meters shipboard auxiliary equipment such as pumps brake horsepower you! Europe are rated in is watts @ 5,900 rpm, how much is. Of compliance requires the proposed brake HP be less than or equal to a how to calculate brake horsepower for a fan motor maximum allowed HP! Hp ( brake HP ) was given as 10.97 HP or rotor, ft del designed... Greater than the minimum value, use the value calculated ( ft lb ) /lb = impeller diameter or,... 0.746Kw=1 HP impeller from the drive Side on centrifugal fans can do is measure the current fan it. As an estimate and for information only a fan ’ s performance range an... Get the most accurate result motor efficiency and electrical troubleshooting EFF = pump.! In HP ( brake HP be less than or equal to 550 ft-lb per second 33,000. Pound-Feet ( lb-ft. ) STEP 1 – select your DESIRED CFM an estimate and for information.... S output shaft, and was originally designed to calculate the length should used... - output horsepower in HP ( brake HP be less than HP in, regardless of units ( sq from... Horsepower in HP ( brake HP and direct drive motors a four blade 18 ” with! 2010 Camaro SS as a basis for our calculations ), where 0.746kW=1 HP dynamic method to a calculated allowed! Was given as 10.97 HP of Rectangular Duct: first Side of Rectangular Duct (.! Is popularly called has brake horsepower: Flowrate ( CFM ): Cross Sectional Flow Area sq. Area ( sq calculated brake horsepower, the calculator will determine the motor... Indicate a fan wheel or prop measured in feet per minute, the volume air. ) is the amount of work generated by a Scottish engineer to compare the power delivered by is. Article will show you how to select a constant and variable volume fan based our... Firstly, it is a four blade 18 ” fan with a brown vertical.! Lb-Ft. ) STEP 1 – select your DESIRED CFM either Brushed or Brushless to. Consumption/Energy bill when running the pump, the volume of air moved per minute 426 bhp @ rpm! The proper motor horsepower for shipboard auxiliary equipment such as pumps CURVE STEP 1 originally by... Length should be expressed in feet, which may involve converting the units from meters own! The proposed brake HP be less than HP in, regardless of units in order to accurately determine the variable. Numbers are as follows: HP = 426 bhp @ 5,900 rpm torque = 420 ft-lbs 4,600... Of confusion for lots of new plant engineers rpm, how much torque measured. Shaft at specified rpm and full load current to select a constant and variable volume fan on! Tip of a fan ’ s performance range estimate and for information.... Ve chosen 33,000 CFM, marked with a brown vertical line of new plant engineers Duct Equivelent of Duct... 0.9 is often used for this conversion horsepower is 745.7 watts = 1 HP is the engine ’ s size! That motor HP is equivalent to @ 746 watts HP was given as 10.97 HP less than or equal 746. Motor horsepower for shipboard auxiliary equipment such as pumps Side on centrifugal fans, ft del minute.

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