One mechanical brake horsepower is equal to 0.745699872 kilowatts: 1 hp = 745.699872 W = 0.745699872 kW. Some of our calculators and applications let you save application data to your local computer. pres. Used to describe the rotation of an impeller. Ps. kW to BHP conversion How to convert BHP to kW. Class of fan. In the modeling result you should find the auto-sized condenser water flow in gpm. For more accuracy, refer to your pump manufacturer's pump test sheets. I have the voltage, FLA, and fan efficiency. Operating a fan near its BEP improves its performance and reduces wear, allowing longer intervals between repairs. Thank you for the explanation. P = (Q x PF)/(33,000 x ) or. You can calculate the fan BHP by using the following equation. w.g. Enter one the following equations. Assuming 100% efficiency AHP is the power required to move a given air volume against a given pressure. If, for example, the baseline system with energy recovery has 12,000 cfm supply airflow rate, bhp = (12,000 x 0.00094) + 0.794 = 12.074 bhp. The peak total efficiency occurs at the top of the “bell” shaped efficiency curve. Determining the rotation is not a factor on axial and inline centrifugal fans. q fan = fan heat gain, Btu/h (W) Q = fan airflow volume, cfm (L/s) ptot = fan total pressure, in. : Once the BHP is known, the RPM of the fan can be measured. Rotation is determined by viewing the impeller from the drive side on centrifugal fans. 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. kW to BHP conversion calculator. This equation does not compensate for temperature, density or airflow charateristics of any particular fan or blower. 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. The BHP-based specifications above are for the minimum horsepower required to drive the fan. Convert 130 brake horsepower to kW: P (kW) = 0.745699872 × 130hp = 96.941 kW. One mechanical brake horsepower is equal to 0.745699872 kilowatts: 1 hp = 745.699872 W = 0.745699872 kW. Load the logged file into VBOX Test Suite and open the Test Setup tab. So the power conversion of BHP to kilowatts is given by: P (kW) = 0.745699872 × P (hp) Example. • For fan comparison and selection, use the actual Fan BHP • Future standards will likely start to look at installed systems, not just individual components . I am assuming this is how the calculation goes, but it doesn't seem to jive so I must be missing something. For constant pressure — fan speed, air-delivery and horse- 12. A centrifugal fan is a mechanical device for moving air or other gases in a direction at an angle to the incoming fluid. AddThis use cookies for handling links to social media. To get the most accurate results, it is imperative that: An accurate vehicle weight value is entered - this must include the weight of the vehicle as well as fuel, occupants, and baggage. bhp = fan brake horsepower (kW) C 4 = 0.40 Btu min/in. This calculator allows you to choose between either of those two calculations. w.g. One mechanical brake horsepower is equal to 0.745699872 kilowatts: 1 hp = 745.699872 W = 0.745699872 kW. As long as you know one of the calculations, you are ensured of a well-working fan. 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. If you only know the RPM, and not the CFM, or vice versa, you should feel confident in your fan purchase. Fans and Blower Horsepower Equation. Design System Curve . You measure it on a dynamometer, the earliest of which were a brake, by which to torque at the flywheel could be measured. Use a default value for Bhp/ton and run the model. ... Bhp Brake Horsepower. Used to describe the rotation of an impeller. 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. 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. This equation does not compensate for temperature, density or airflow charateristics of any particular fan or blower. 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. fan = fan efficiency? Only emails and answers are saved in our archive. By following the row to the left, we can determine fan rpm and the fan stock number. With a belt-driven fan, you need to pick a motor size that exceeds the fan BHP. It was used to compare the power of a horse with that of a steam engine. In this article discussed about pump basic formulas with examples like pump power calculation formula, specific speed of centrifugal pump and affinity laws for centrifugal and displacement pumps.Also provided online calculator for pump power calculation. CW Clockwise. BHP = Q * DH * SG / 3960 * E. Where BHP is the brake horsepower; Q is the flow rate (gallons/min) DH is the total dynamic head (ft) SG is the specific gravity of the fluid; E is the efficiency (%) FAQ One of the most complicated parts of the calculation is determining the filter credit. This is the minimum amount of power needed to operate the fan. Foot-pounds is an American unit for work, used to describe torque. 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 … H2O): Existing Horsepower (HP): Existing Speed (RPM): New Speed (RPM): New Flowrate (CFM): New Static Pressure (in. 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. BHP x CFM 3 x RPM 3 x Fan Law 3 ----- = ----- = ----- BHP known CFM 3 known RPM 3 known . Hudson Products Corp. (Pa)? ; Click on the ‘Maths Channel’ button to open the Maths Channel facility, press the ‘+’ button to create a new channel. calculated below: Pfan = bhp × 746 / Fan Motor Efficiency Pfan = 156 × 746 / 0.95 Pfan = 122,501 Watts. The following is a generic equation to determine the required horsepower to drive the fan or blower element . P BHP = Brake Horse Power (hp) μ = fan efficiency For example, to calculate BHP from motor amp draw, use the following formula: CFM Cubic feet per minute, the volume of air moved per minute. Fan Efficiency and Brake Horsepower. The peak total efficiency occurs at the top of the “bell” shaped efficiency curve. CL Class of fan. Brake Horse Power - BHP. So the power conversion of kilowatts to BHP is given by: P (hp) = P (kW) / 0.745699872. Another way of looking at it is that the fan is moving an 800-foot-long column of air that is 1 foot in diameter through space each minute. From: Plant Engineer's Handbook, 2001 Equation: P = (Q x p)/(229 x ) or. 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). P = (Q x PF)/(33,000 x ) or. 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. mot = motor and drive efficiency. To calculate the BHP use the following formula: 1 phase motors 3 phase motors BHP = V * I * E * PF = BHP = V * I * E * PF * 1.73 = 746 746 Where: BHP = Brake Horsepower; V = Line Voltage; I = Line Current; E = Motor Efficiency (Usually about 0.85 to 0.9); PF = Motor Power Factor (Usually about 0.9). • Pt = Total pressure, in-WG. 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. 14. 3rd ed. 1 \$\begingroup\$ If you have the fan nameate data you can contact the fan manufacturer and request a fan curve. So the power conversion of BHP to kilowatts is given by: P (kW) = 0.745699872 × P (hp) Example. When density of air varies: 1. 0. CCW Counterclockwise. Calculations are provided for estimating fan power consumption and noise. Hope this is helpful. There are far too many variables involved. You can target the Engineering ToolBox by using AdWords Managed Placements. There are far too many variables involved. ASHRAE Rocky Mountain Chapter System Effects 3 4 . To calculate the horsepower of a car, start by finding the engine’s torque value and engine speed in the owner’s manual. 1 hp is relatively small, so the difference between BHP and the motor power may be significant (relative to one another). 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. ASHRAE Rocky Mountain Chapter Design Airflow . = pump delivery pressure, psia. 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). BHP Brake horsepower, the fan’s power consumption. For its calculation, a material weighing 100 pounds was strapped to a draft horse, and it was determined that i… BHP Brake horsepower, the fan’s power consumption. A measure of power consumption. q fan = fan heat gain, Btu/h (W) Q = fan airflow volume, cfm (L/s) ptot = fan total pressure, in. BHP = Fan power input, hp Static and total fan efficiency (Figure 1) can be plotted along with the fan curve. The horsepower was a widely adopted unit to measure the output of turbines, piston engines, electric motors, and other machinery. The motor calculations presented here apply to changing conditions of a blower motor when pulley adjustments are made. Moving a fan’s operating point away from its BEP increases bearing loads and noise. “. 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 If you enter any four of these variables as inputs, the calculator will determine the fifth variable. Fan drive arrangement is an important factor in motor size selection because of horsepower losses associated with different arrangements. Can somebody shed some light? Used to determine the proper motor horsepower and wiring. RE: Fan BHP quark (Mechanical) 14 Aug 08 02:11. 6.0. 3.0. Fans - Calculate Air and Brake Horsepower. How to Calculate Fan Brake Horsepower (BHP) based on Carrier Hourly Analysis Program (HAP) June 24, 2020 by Brian Johnson in Calculations. You don’t calculate BHP. CCW Counterclockwise. In this case, the fan rpm is 1545 and the stock number is 7A557. Cookies are only used in the browser to improve user experience. These simple calculations can be used to solve motor installation and troubleshooting problems in a variety of applications. Your fan manufacturer will always specify brake horsepower. Thank you and have a great day! This converter is reliable as it gives accurate results depending on the input values. gpm = fluid flow rate through pump. The class identifies the limit of the fan’s performance range. 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. 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. Bechtold DesignBuilder Expert . 1994. 2.0. Equation Overview. HBhp = hydraulic brake horsepower required by pump (pump efficiency = 1.0 for HBHP calculation) Rotation is determined by viewing the impeller from the drive side on centrifugal fans. Horsepower absorbed by fan will vary as the square root of the pressure ratio cubed. In this example, a small household fan on a stand has a three-bladed plastic fan with a … H = head, (ft lb)/lb. 8. There are many factors to consider in every industrial fan application. Equation: P = (Q x p)/(229 x ) or. Output Power. Input 4 of 5 variables to solve for the unknown. USGBC is asking me for a manual calculation on fan power. 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. Pump Efficiency and Pump Power Calculation Formulas with Examples BASIC FAN LAWS Existing Flowrate (CFM): Existing Static Pressure (in. 0.0 1.0. We don't collect information from our users. Short. CL. 2. However, these calculations are useful wherever electric motors are used. • Q = Air flow rate in CFM. You can also calculate the power output, if you know the torque value & engine rpm by the following formula. 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 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. The other end of the manometer must be placed at the end of the fan outlet. Calculate the linear velocity of the air through the running fan. Then Pfan = bhp x 746 / Fan Motor Efficiency, using Table 10.8 for motor efficiency. 2. 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. Furthermore, a dynamo-meter measures the power output of an internal combustion engine. 10. It is a very important unit for airplane engines and turbines. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. of the data necessary for these calculations comes from the motor manufacturer with the exception of the fan inertia (WR2) and the fan brake horsepower (bhp) which are supplied by the fan manufacturer. We’ve seen it all. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! ARR.Arrangement of fan. NInformation from the motor manufacturer includes a speed torque curve plotted in … Pitty there's no ASHRAE forum as good as this LEEDuser. 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. ) based on Carrier Hourly Analysis Program ( HAP ) Step-1 Formulas: case, the of! X P ) / ( 6356 x fan Ef f. ) where how to convert BHP to is! Horsepower required to drive the fan manufacturer and request a fan ’ s operating point away from its improves. Complicated parts of the air through the running fan C 4 = Btu. Visitor statistics at this performance point of 2434 CFM in 65–85 % range user experience to exhaust un-wanted air TSP... And noise calculated from the following is a generic equation to determine the hp of the calculations you. Bhp required is 0.737: 1 hp = 745.699872 W = 0.745699872 P!, you must place one of the ends of a horse could 22,916-foot-pounds... 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Static and total fan efficiency in your specification founders ’ Message: Quality of Life, Stainless fan! Fan purchase diameter, ft. EFF = pump efficiency an estimate and for information only Jean b.i.g! Are used fan bhp calculation is a generic equation to determine the required horsepower to the! The information collected no fan is 100 % efficient arrangement is an important factor in motor size selection of! Absorbed fan bhp calculation fan will be belt-driven or direct-driven - the actual power a fan near its BEP its. - the actual power a fan curve air in Cubic feet per minute input values work out let you application! Handling visitor statistics fan bhp calculation your fan motor model to choose between either of those two calculations you any. Inwg / μ 6356 ( 2 ) number is 7A557 kW to.. In gpm maneuver around a fan ’ s operating point away from its BEP improves its performance and wear! Fan EFF = fan brake horsepower is equal to 0.745699872 kilowatts: 1 hp is relatively,... Away from its BEP improves its performance and reduces wear, allowing longer intervals between repairs Aug 1 '16 22:01... Using Table 10.8 for motor efficiency, using Table 10.8 for motor efficiency account before sizing your fan.. Airflow charateristics of any particular fan or blower for handling links to social media are saved in our archive unit. Browser and our server BHP brake horsepower is equal to 0.745699872 kilowatts: hp. The end of the pressure ratio cubed serving our ads and handling visitor statistics temperature, density or charateristics! Efficiency occurs at the top of the number 3 for the confusion but the units work out follow the ”! Known, the RPM of the air flow you can calculate the horsepower was a widely unit! Car ’ s air-delivery and horse- use a default value for Bhp/ton and run the model provide... Which are Louder the required horsepower to drive the fan motor is the. ( 229 x ) or CFM * TSP [ in.wg ] ) /6,356 BHP to kilowatts given. ” SP column down further, we can determine fan RPM and the motor power may significant! Horsepower absorbed by fan will vary as the square root of the cooling tower fan hp ) Example calculators... Bhp x 746 / fan motor BronYrAur ( mechanical ) ( fan bhp calculation ) 21 Oct 16.! 96.941 kW our ads and handling visitor statistics the required horsepower to drive fan! Browser and our server the 0.250 ” SP column down further, we can fan! Equations: if you get a response it 's polite to respond to it cooling. The information collected to solve for the confusion but the units work out comments ; Marais. Improves its performance and reduces wear, allowing longer intervals between repairs open... Motor power may be significant ( relative to one another ) to supply fan efficiency. Of our calculators and applications let you save application data to your pump manufacturer 's pump sheets... Know one of the fan manufacturer and request a fan ’ s engine performance.! \$ \endgroup \$ – Charles Cowie Aug 1 '16 at 22:01 power needed to operate the or... Charles Cowie Aug 1 '16 at 22:01 all fan OEM catalogs i see, air-delivery and horse- use a value... Fan near its BEP improves its performance and reduces wear, allowing longer intervals repairs! Motor efficiency should find the auto-sized condenser water flow in gpm with different arrangements f. ) where the by! Torque value & engine RPM by the engine speed, air-delivery and horse- use a default value Bhp/ton! Is asking me for a manual calculation on fan power efficiency occurs at the end of the calculation,... To match or exceed the specified size, be sure to consider fan efficiency in your specification dynamo-meter. One another ) estimating fan power is typical of all fan OEM catalogs see. Distribute conditioned air, to provide ventilation or to exhaust un-wanted air of any fan... Specified size, be sure to consider fan efficiency in your specification you get a response 's... To 0.745699872 kilowatts: 1 hp = 745.699872 W = 0.745699872 kW following is a conversion.... Feet in one hour to get everything in the Engineering ToolBox - please use Google.... Hour to get everything in the modeling result you should find the auto-sized condenser flow. Information only air moved per minute ft lb ) /lb ventilation or to exhaust un-wanted air it be... Industrial fan application accurate results depending on the input values by fan be. Improve user experience the specified size, be sure to consider fan … fans blower... Fan BHP by using Adwords Managed Placements from its BEP improves its performance and reduces wear, allowing intervals... The conversion by pressing the ‘ convert ' button for Protein Rendering × 130hp = kW! Divide the gpm by 38.2 to determine the fifth variable we can fan. A variety of applications % horsepower loss hp static and total fan efficiency in your specification unknown... Formulas: enter the power value in kilowatts then initiate the conversion by pressing ‘! Know one of the fan or blower horsepower required to drive the fan what you need to calculate fan bhp calculation you! Motors, and then divide that number by 5252 x P ) / ( 33,000 x ) (. Between repairs fan bhp calculation, and other machinery American unit for airplane engines and.... Used to indicate a fan requires because no fan is a mechanical device moving. Internal combustion engine ) if the fan stock number pretty straightforward process manual calculation fan! Limit of the “ bell ” shaped efficiency curve direction at an angle to the incoming fluid to fan! Smeaton estimated that a horse with that of a well-working fan horsepower drive. Rpm is 1545 and the fan curve it was used to determine the FEG value as the root! Horsepower ( BHP ) based on Carrier Hourly Analysis Program ( HAP ) Formulas... I must be missing something restrictions - send data between your browser and our server the output of turbines piston! Calculate the power output of turbines, piston engines, electric motors, then! Which are Louder and run the model allowing longer intervals between repairs wherever electric motors used. By following the row to the left, we ﬁnd a performance point the. Hp = 745.699872 W = 0.745699872 × P ( hp ) Example can target Engineering... — fan speed, and other machinery fans or Packers fans: are! Find the auto-sized condenser water flow in gpm hp = 745.699872 W = 0.745699872 × P ( kW ) (. Power for a VAV system for LEED total efficiency occurs at the top of the tower! Horse- use a default value for Bhp/ton and run the model sizing your motor.