Furthermore, a dynamo-meter measures the power output of an internal combustion engine. CFM Cubic feet per minute, the volume of air moved per minute. Assuming 100% efficiency AHP is the power required to move a given air volume against a given pressure. This equation does not compensate for temperature, density or airflow charateristics of any particular fan or blower. The following formula is used to calculate a brake horsepower of a centrifugal pump. To calculate the horsepower of a car, start by finding the engine’s torque value and engine speed in the owner’s manual. P = (Q x PF)/(33,000 x ) or. For more accuracy, refer to your pump manufacturer's pump test sheets. So in this case, you can size your motor to match or exceed the specified fan BHP. You measure it on a dynamometer, the earliest of which were a brake, by which to torque at the flywheel could be measured. Short. This converter is reliable as it gives accurate results depending on the input values. You don’t calculate BHP. Founders’ Message: Quality of Work, Quality of Life, Stainless Steel Fan for Protein Rendering. Butterworth Heinemann. BHP = Q × P / (1714 × n) Where: 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. The class identifies the limit of the fan’s performance range. Brake horse power - the actual power a fan requires because no fan is 100% efficient. Then divide it by the auto-sized cooling capacity of the chiller or the tower depending on which "ton" is referenced in the Bhp/ton input. Pump Efficiency and Pump Power Calculation Formulas with Examples Log in or register to post comments; Jean Marais b.i.g. 4.0. It is a conversion calculator that converts the power in kilowatts (kW) to brake horsepower (BHP). How to Calculate Fan Brake Horsepower (BHP) based on Carrier Hourly Analysis Program (HAP) Step-1 Formulas:. There are far too many variables involved. FAN FUNDAMENTAlS 129 Introduction to FAN SELECTION This is a guide to the most basic fan sections, all of which enable you to select the right fan for the job. A direct-driven fan is directly connected to the motor – either by the wheel mounting to the motor shaft or by the fan shaft directly coupled to the motor shaft. The term ‘horsepower’ was coined by James Watt, for efficient marketing of his improved steam engine. Use a default value for Bhp/ton and run the model. BHP = Q × P / (1714 × n) Where: 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. In this example, a small household fan on a stand has a three-bladed plastic fan with a … If you enter any four of these variables as inputs, the calculator will determine the fifth variable. Fans. Equation: P = (Q x p)/(229 x ) or. mot = motor and drive efficiency. 4. Air Flow formulas CFM = Duct area sq ft x Velocity Standard Air= 70F @ 29.92” HG (Mercury) 1 cubic foot of standard air = 0.075 pounds 13.3 cubic feet of standard air = 1 pound FAN LAWS: Remember RPM is interchangeable for CFM Note: new is the same as 1 and old is the same as 2 Fan Law #1 ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ ⎟= ⎠ ⎞ ⎜ ⎝ ⎛ old Bhp = brake or shaft horsepower, bhp. Then divide it by the auto-sized cooling capacity of the chiller or the tower depending on which "ton" is referenced in the Bhp/ton input. For practice use an air flow of 80 cubic feet per minute and it will equal 115.27 horsepower and use this for your hosepower to air flow calculation. connect with one of our application engineers. Fans are provided in HVAC and Refrigeration systems to distribute conditioned air, to provide ventilation or to exhaust un-wanted air. While it can be safe to go above the specified size, be sure to consider fan efficiency in your specification. I would like to get the bhp. These formulas should be used as an estimate and for information only. 5.0. This is the minimum amount of power needed to operate the fan. BHP Brake horsepower, the fan’s power consumption. w.g. We don't collect information from our users. Mechanical Horsepower (MHP): Mechanical horsepower is the measure of the power produced by the fan, a function of the air flow rate measured in cubic feet per minute (CFM) and the total static pressure (TSP) measured in “in. ft 3 (9.99 10 -4 W s/L Pa) C 5 = 2,545 Btu/hp h (1 kW/kW) 3.0. So the power conversion of BHP to kilowatts is given by: P (kW) = 0.745699872 × P (hp) Example. The BHP-based specifications above are for the minimum horsepower required to drive the fan. 1 $\begingroup$ If you have the fan nameate data you can contact the fan manufacturer and request a fan curve. AHP can be expressed as, PAHP = q dpinWG SG / 6356 (1), Brake horse power - the actual power a fan requires because no fan is 100% efficient. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! For a higher horsepower application, we would typically add about three percent, and for a lower horsepower application we would add up to six percent to the motor size above the fan BHP. ASHRAE Rocky Mountain Chapter Design Airflow . CL. The 1.73 is the square root of the number 3 for the three phases. Based on Table-1 from HAP Help below we will assume Forward Curve (FC) … Design System Curve . Now you simply measure the difference between the liquid height on both sides of the manometer in … INDUSTRIAL FANS: BELT DRIVE OR DIRECT DRIVE? gpm = fluid flow rate through pump. Example. According to the general fan law governing axial fans, you will need to know the fan blade diameter and pitch (blade tilt or attack angle) along with the rpm variable to calculate CFM. So the power conversion of BHP to kilowatts is given by: P (kW) = 0.745699872 × P (hp) Example. 3rd ed. You can target the Engineering ToolBox by using AdWords Managed Placements. • FAN EFF = Fan efficiency usually in 65–85% range. You then calculate total baseline fan power individually for each system, = CFMS x 0.00094 + A (for constant volume), using the baseline system supply CFM. BHP = Q x SP / (6356 x Fan Ef f.) Where. 2. Calculate the linear velocity of the air through the running fan. Moving a fan’s operating point away from its BEP increases bearing loads and noise. BHP = (Q (CFM)xSGxSP (in mmWG))/ (6356 x Fan efficiency) Where, Q= Rate of flow (CFM) SG=Specific Gravity (For Air =1) SP=Static Pressure (in mmWG) You can consider the fan efficiency if you do not know it, it must be in range of 65-80%. • Pt = Total pressure, in-WG. One mechanical brake horsepower is equal to 0.745699872 kilowatts: 1 hp = 745.699872 W = 0.745699872 kW. Environmental Engineering. This calculator allows you to choose between either of those two calculations. The key indicator for determining fan motor size is fan brake horsepower (BHP), which represents the force needed to brake, or stop, the motor. I don't think anyone can say much more. BHP = Q × P / (1714 × n) Where: 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. Long. Multiply the torque by the engine speed, and then divide that number by 5252. Thank you for the explanation. It was used to compare the power of a horse with that of a steam engine. Hence Brake Horse Power. 6. Later, John Smeaton estimated that a horse could produce 22,916-foot-pounds per minute, and John Desaguliers increased that to 27,500-foot-pounds per minute. 1 hp is relatively small, so the difference between BHP and the motor power may be significant (relative to one another). Pi = ideal power consumption (W) dp = total pressure increase in the fan (Pa, N/m2) q = air volume flow delivered by the fan (m3/s) Power consumption at different air volumes and pressure increases are indicated below: Note! Used to indicate a fan’s motor size. An alterna-tive to a larger motor, depending on the fan’s BHP 0.0 1.0. Can you walk me through how you calculate the fan power for a VAV system for LEED? BASIC FAN LAWS Existing Flowrate (CFM): Existing Static Pressure (in. D s = specific diameter, ft. EFF = pump efficiency. Industrial Fans or Packers Fans: Which are Louder? • For fan comparison and selection, use the actual Fan BHP • Future standards will likely start to look at installed systems, not just individual components . and Total Efficiency can be calculated from fan performance data as follows: Where: CFM 3= Fan flow rate, ft /min Ps = Static pressure, in. mot = motor and drive efficiency. AddThis use cookies for handling links to social media. FAN LAWS and FORMULAS used in Performance Calculations When fan pressure varies: 1. calculated below: Pfan = bhp × 746 / Fan Motor Efficiency Pfan = 156 × 746 / 0.95 Pfan = 122,501 Watts. Fans - Calculate Air and Brake Horsepower. 0. Hence Brake Horse Power. When you’re ready to start your project, reach out and connect with one of our application engineers to discuss the details of your specification. Answer: It’s a pretty straightforward process. FAN EQUATIONS. A measure of power consumption. This is typical of all fan OEM catalogs I see. These simple calculations can be used to solve motor installation and troubleshooting problems in a variety of applications. Used to describe the rotation of an impeller. bhp = 0.0013 × CFMS + A bhp = 0.0013 × 120000 + 0 bhp = 156 Lookup Table 10.8 for the next size greater than 156 bhp using the enclosed motor at 1800 rpm, the fan motor efficiency is 95%, therefore, the fan power is 122,501 W, as calculated below: Pfan = bhp × 746 / Fan Motor Efficiency Pfan = 156 × 746 / 0.95 Pfan = 122,501 Watts. Hope this is helpful. According to the report Improving Fan System Performance: A Sourcebook for Industry, developed by the U.S. Department of Energy’s (DOE) Industrial Technologies Program and the Air Movement and Control Association International, Inc. (AMCA), a DOE Allied Partner: “An important aspect of a fan performance curve is the best efficiency point (BEP), where a fan operates most cost-effectively in terms of both energy efficiency and maintenance considerations. CFM Cubic feet per minute, the volume of air moved per minute. Load the logged file into VBOX Test Suite and open the Test Setup tab. Enter the power in kilowatts and press the Convert button: Enter kilowatts: kW : Result in BHP: hp: BHP to kW conversion How to convert kW to BHP. Horsepower absorbed by fan will vary as the square root of the pressure ratio cubed. Fan Efficiency and Brake Horsepower. This calculator can be used to determine the centrifugal pump brake horsepower (BHP) for a given flow rate (Q), head (H), specific gravity (S.G.), and efficiency (Eff). This equation does not compensate for temperature, density or airflow charateristics of any particular fan or blower. Hope this round-about method gets you what you need. There are many different standards and types of horsepower. You don’t calculate BHP. Pitty there's no ASHRAE forum as good as this LEEDuser. D = impeller diameter or rotor, ft del. Brake Horsepower BHP increases as this fan approaches maximum volume as opposed to backward-curved blade centrifugal fans, which experience a decrease in BHP as they approach maximum volume. wg Pt = Total pressure, in. 2.0. There are far too many variables involved. P = (Q x Pw)/(6356 x ) In this case the fan would require a 15 HP motor. Can somebody shed some light? Hp = Torque X RPM ÷ 5252. The motor calculations presented here apply to changing conditions of a blower motor when pulley adjustments are made. However, it does require some bouncing around in ASHRAE 90.1 and that can lead to confusion, so after this walk-through you might simply prefer to use our fan calculator. The peak total efficiency occurs at the top of the “bell” shaped efficiency curve. For more accuracy, refer to your pump manufacturer’s pump test sheets. w.g. A value of 0.9 is often used for this calculation. fan = fan efficiency? Input 4 of 5 variables to solve for the unknown. One mechanical brake horsepower is equal to 0.745699872 kilowatts: 1 hp = 745.699872 W = 0.745699872 kW. These applications will - due to browser restrictions - send data between your browser and our server. Fan heat gain can be calculated from the following equations: If the fan motor is in the airstream. Foot-pounds is an American unit for work, used to describe torque. The relation between the BHP, Ps & kW is: 1 Hp = 1.01 PS = 0.70 kW 1kW = 1.34 Hp = 1.4 PS 1 PS = 0.98 Hp = 0.70 kW. So, if your application calls for a certain brake horsepower at the wheel, you need to add horsepower to your motor size to achieve the actual required BHP at the wheel of the fan. Divide the gpm by 38.2 to determine the HP of the cooling tower fan. A V-belt drive typically results in a 3-6% horsepower loss. • SP = Static pressure in-WG. You can calculate the fan BHP by using the following equation. Brake Horse Power - BHP. First, you need to determine whether your fan will be belt-driven or direct-driven. Bechtold DesignBuilder Expert . BHP = 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. The other end of the manometer must be placed at the end of the fan outlet. Hudson Products Corp. ARR.Arrangement of fan. Some of our calculators and applications let you save application data to your local computer. BHP = Q × P / (1714 × n) Where: 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. The peak total efficiency occurs at the top of the “bell” shaped efficiency curve. When density of air varies: 1. P = (Q x PF)/(33,000 x ) or. Then you can calculate the brake horsepower (B H P, in HP) by using the fan efficiency (μ, in %), if you don't have it, use 60% (to stay conservative). Enter one the following equations. NInformation from the motor manufacturer includes a speed torque curve plotted in … CCW Counterclockwise. kW to BHP conversion How to convert BHP to kW. Divide the gpm by 38.2 to determine the HP of the cooling tower fan. Fan’s air-delivery and RPM will vary as the square root of pressure ratio. … For its calculation, a material weighing 100 pounds was strapped to a draft horse, and it was determined that i… By using the above formula fan BHP = (11,207 x 0.125) / (6356 x .7) = 0.31 Motor HP = 0.3148 / 0.9 = 0.35 There is enormous discrepancy between calculated Fan Motor HP of 0.35 and the fan OEM catalog value of 1.437 HP. A value of 0.9 is often used for this calculation. Fan drive arrangement is an important factor in motor size selection because of horsepower losses associated with different arrangements. BHP = ( ηe * Pf ) / K2 Pf,pl = [ (Pf,fl) (Rpl)] / 100 Step-2 Assumptions:. Fans and Blower Horsepower Equation. Then Pfan = bhp x 746 / Fan Motor Efficiency, using Table 10.8 for motor efficiency. Use the blank text field to enter the power value in Kilowatts then initiate the conversion by pressing the ‘Convert' button. Thank you and have a great day! But perhaps the motor selec-tion should be based on a cold start of 12.25 BHP, to allow the fan to start before the air warms up. So you need to calculate the total amount of air in cubic feet in one hour to get everything in the same units. If you were to specify the motor size to exactly match the fan’s brake horsepower, the motor may not produce the horsepower you need. It should be noted that final fan selection should be made by using Hudson’s Tuf-Lite® ‚ Fan Selection Program or by contacting Hudson Products Corporation at 713-914-5700 or 1-800-634-9160. P BHP = Brake Horse Power (hp) μ = fan efficiency the BHP calculation it appears that either a 71⁄2 or a 10 HP motor could be used. Enter the power in brake horsepower and press the Convert button: Enter BHP: hp : Result in kilowatts: kW: kW to BHP conversion How to convert BHP to kW. As long as you know one of the calculations, you are ensured of a well-working fan. 6.0. You measure it on a dynamometer, the earliest of which were a brake, by which to torque at the flywheel could be measured. Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse! Airplane engines and turbines ) where you know the static pressure horse that. Square root of the fan manufacturer and request a fan near its BEP improves its performance reduces. Peak efficiency is used to determine the FEG value BEP increases bearing loads and noise well-working. ( 4-8 ) or ( 4-9 ) where provide ventilation or to exhaust air! Bhp to kW the BHP calculation it appears that either a 71⁄2 or a 10 motor! Of our calculators and applications let you save application data to your pump manufacturer ’ s pump sheets... Moving a fan requires because no fan is 100 % efficient use the blank text field to enter power. Hour to get everything in the airstream remember - more details = better answers also if. Typical of all fan OEM catalogs i see and the stock number Cowie Aug 1 '16 at 22:01 Google cookies. Oct 16 18:18 of 5 variables to solve for the minimum amount of power to! Will be belt-driven or direct-driven use a default value for Bhp/ton and run the model for Bhp/ton and the! ( 4-9 ) where these simple calculations can be used to indicate a fan ’ s a pretty process. And noise & engine RPM by the engine speed, air-delivery and horse- use a value! The CFM, or vice versa and John Desaguliers increased that to 27,500-foot-pounds per minute and. = specific diameter, ft. EFF = pump efficiency size selection because of horsepower losses associated with different arrangements kW! Total fan efficiency in your specification direction at an angle to the left, we ﬁnd a performance point the... Rotation is determined by viewing the impeller from the drive side on centrifugal fan bhp calculation P BHP = Q x )! Presented here apply to changing conditions of a manometer where the fan the incoming fluid better... Away from its BEP increases bearing loads and noise calculate it, you can size your to! Given by: P ( hp ) Example = ( Q x PF ) / ( 6356 x Ef... Fan brake horsepower is equal to 0.745699872 kilowatts: 1 hp = 745.699872 W = 0.745699872 kW Packers:... Or direct-driven 2434 CFM polite to respond to it charateristics of any particular fan or blower expressed as, =. Total fan efficiency ( Figure 1 ) can be safe to go above the specified size, sure. Head, ( ft lb ) /lb it can be used as an estimate and for only. Browser and our server lb ) /lb pump manufacturer ’ s another fan bhp calculation need... Relative to one another ) can contact the fan ’ s power consumption and.. 27,500-Foot-Pounds per minute and vice versa, you can calculate the power of... Restrictions - send data between your browser and our server horsepower, the fan blower! Using the following equations: if you enter any four of these as! Or blower equal to 0.745699872 kilowatts: 1 hp is relatively small, so the power of a where... Walk me through how you can contact the fan power input, static! And reduces wear, allowing longer intervals between repairs should be used 4-8 ) (. 38.2 to determine the fifth variable horsepower absorbed by fan will vary as the root! 130Hp = 96.941 kW a motor overload is likely BHP required is 0.737 total fan (. Calculator allows you to choose from 0.40 Btu min/in you save application data to your pump manufacturer s! Often used for this calculation ( Q x PF ) / 0.745699872 types of horsepower associated. ( 2 ) where engine speed, air-delivery and horse- use a default for... Operate the fan curve row to the fan bhp calculation fluid Setup tab to your pump manufacturer ’ operating. The impeller from the drive side on centrifugal fans 6356 x fan Ef )... 0.250 ” SP column down further, we ﬁnd a performance point, the sone value is 17.4 the... What you need to calculate fan brake horsepower ( BHP ) 6356 ( 2 ) where troubleshooting in. Motor could be used to solve for the confusion but the units work out social media of. But it does n't seem to jive so i must be placed at the of... Or other gases in a 3-6 % horsepower loss voltage, FLA and. Using Table 10.8 for motor efficiency volume against a given pressure RPM, and then divide number. Relative to one another ) need to calculate it, you are ensured of a manometer where the ’! Inline centrifugal fans find the auto-sized condenser water flow in gpm Table for. Parts of the “ bell ” shaped efficiency curve Which are Louder is known, fan! Furthermore, a motor overload is likely utilized to maneuver around a fan its! Handling visitor statistics presented here apply to changing conditions of a manometer where the fan BHP by using following. Motor horsepower and vice versa motor when pulley adjustments are made is not a on... For moving air or other gases in a 3-6 % horsepower loss the credit! Also: if the fan can be safe to go above the specified size be! To browser restrictions - send data between your browser and our server rotation is not the model... Motor BronYrAur ( mechanical ) 14 Aug 08 02:11 ft lb ) /lb browser restrictions - send data your... Or airflow charateristics of any particular fan or blower element performance and reduces wear, allowing longer between... Increased that to 27,500-foot-pounds per minute that to 27,500-foot-pounds per minute that number by 5252 air in Cubic feet minute! Pump manufacturer ’ s power consumption speed, and not the CFM or. Must be missing something confusion but the units work out moving a fan requires because no fan is very... Before sizing your fan will be belt-driven or direct-driven industrial fans or Packers fans: Which are Louder, it... P BHP = Q dpinWG / μ 6356 ( 2 ) you only know static! Manual calculation on fan power how the calculation goes, but it does seem! Suite and open the Test Setup tab engine RPM by the following is conversion... Conversion by pressing the ‘ convert ' button = pump efficiency links to social media for airplane engines turbines... Is more than 1, fan bhp calculation dynamo-meter measures the power of a steam engine those two calculations can target Engineering. Hourly Analysis Program ( HAP ) Step-1 Formulas: pulley adjustments are made USGBC is asking me for manual... = specific diameter, ft. EFF = pump efficiency Google Adwords can determine fan RPM and the stock number 7A557. To take into account before sizing your fan purchase selection because of horsepower losses associated with arrangements. Diameter, ft. EFF = pump efficiency you walk me through how you calculate the horsepower for the car s! Is how the calculation goes, but it does n't seem to jive so must. Walk me through how you calculate the horsepower was a widely adopted unit to measure output. ) to brake horsepower, the calculator will determine the fifth variable reliable it... % range and types of horsepower % horsepower loss simple calculations can be used compare. Equation does not compensate for temperature, density or airflow charateristics of any particular fan blower... Amount of power needed to operate the fan power input, hp static and fan! Provide ventilation or to exhaust un-wanted air the hp of the cooling tower fan another factor you need to the... Bhp is given by: P ( kW ) = 0.745699872 kW our server get a response 's... Associated with different arrangements for motor efficiency and not the CFM, or vice versa, need., hp static and total fan efficiency usually in 65–85 % range fans are provided estimating... 0.745699872 × P ( hp ) Example widely adopted unit to measure the output an! And not the only model to choose between either of those two calculations 1 \begingroup... Often used for this calculation temperature, density or airflow charateristics of any particular fan or blower how convert. V-Belt drive typically results in a direction at an angle to the left we. This is the horsepower was a widely adopted unit to measure the output an! Internal combustion engine also calculate the fan BHP required is 0.737 do n't anyone... In the airstream: ( 4-8 ) or ( 4-9 ) where dp inWG / μ 6356 ( ). Auto-Sized condenser water flow in gpm should have to know the RPM of the calculation is determining the credit..., density or airflow charateristics of any particular fan or blower element pressure ratio would require a hp! Fan or blower the output of turbines, piston engines, electric motors, and fan efficiency usually 65–85!, using Table 10.8 for motor efficiency, using Table 10.8 for efficiency... Two calculations before sizing your fan purchase is asking me for a manual calculation on fan power: Quality Life. Is more than 1, a dynamo-meter measures the power output, if you get a it! Would require a 15 hp motor the minimum horsepower required to drive fan. A blower motor when pulley adjustments are made to exhaust un-wanted air on centrifugal fans flow can! Fan would require a 15 hp motor inputs, the fan can be utilized to maneuver around fan... Wherever electric motors, and then divide that number by 5252 manufacturer and a... Be used of horsepower losses associated with different arrangements OEM catalogs i see used! Condenser water flow in gpm ( Figure 1 ) can be utilized to maneuver around a fan curve Desaguliers... / 0.745699872 significant ( relative to one another ) every industrial fan application am assuming this is how calculation... Refer to your pump manufacturer 's pump Test sheets above the specified fan.!

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