3rd ed. BHP Brake horsepower, the fan’s power consumption. The watt is also a unit of power. Calculating Horsepower from Torque. For an electric motor, brake horse power is the mechanical horsepower available at the shaft at specified rpm and full load current. Brake horsepower and fan curves with direct drive motors. = pump delivery pressure, psia. BHP is measured within the engine’s output shaft, and was originally designed to calculate and compare the output of steam engines. 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 … Also included is information on motor efficiency and horsepower calculations as well as several motor calculations for energy efficiency and electrical troubleshooting. 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. Does anyone have any information regarding brake HP and direct drive motors? These formulas should be used as an estimate and for information only. CW Clockwise. Excellent question and a source of confusion for lots of new plant engineers. All you can do is measure the current fan and it is a four blade 18” fan with a 30 degree angle. Since motors are not 100% efficient, the number of amps needed to achieve the power output is actually higher depending on the efficiency. H2O) Round Duct Equivelent of Rectangular Duct: First Side of Rectangular Duct (in. This article will show you how to calculate the horsepower of your cars engine, an electric motor, and your own body. pres. Horsepower out is less than HP in, regardless of units. Its published numbers are as follows: HP = 426 bhp @ 5,900 rpm Torque = 420 ft-lbs @ 4,600 rpm. 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. hp Horsepower. 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. 1 mechanical HP is equivalent to @ 746 watts. 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. Environmental Engineering. Watts = Horsepower × 746. C = constant. Motor Power is the Horsepower of the motor. Used to describe the rotation of an impeller. This work is calculated without the consideration of the effects of any auxiliary component, that may slow down the actual speed of the motor. H = head, (ft lb)/lb. One of my first favorite cars was an MG TD which was honest enough to list both values. Bhp = brake or shaft horsepower, bhp. ft.) Velocity Pressure (in. Choose either Brushed or Brushless motor to get the most accurate result. That's how we spcecify motors - output horsepower in HP (US) or kW (Euro), where 0.746kW=1 HP. 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. CCW Counterclockwise. gpm = fluid flow rate through pump. The class identifies the limit of the fan’s performance range. Bhp Brake Horsepower. D s = specific diameter, ft. EFF = pump efficiency. 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. 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