![]() volume flow in pumps.Ĭalculate pumps hydraulic and shaft power.Ĭharacterizing of impeller types in pumps in a unique and coherent manner.Ĭentrifugal, axial and propeller fans and their capacity ranges.One mechanical horsepower lifts 550 pounds (250 kg) by 1 foot in 1 second. Power is the rate at which work is done or energy converted.Ĭalculate the power gained by fluid from an operating pump or fan.Ĭalculate temperature rise vs. Introduction tutorial to positive displacement pumps basic operating principles.Įlevation and potential energy in hydropower. Power consumption and typical efficiencies of fans Specific Weight and Specific GravityĪn introduction to density, specific weight and specific gravity.Įlectrical Motors - Shaft Power vs. Hydrodynamic losses through pumps depends on fluid viscosities.ĭensity vs. Piping systems and pumps - centrifugal pumps, displacement pumps - cavitation, viscosity, head and pressure, power consumption and more.īoiler horsepower vs. The SI-system, unit converters, physical constants, drawing scales and more. The horsepower required to pump 50 lb m/min water a head of 10 ft with a pump with overall efficiency 0.7 - can be calculated with eq. Together with the equations above it's possible to express (4) in many common combinations - such as: Horsepower can be converted to other common units as: Η e = mechanical efficiency of the electrical motor Horsepower in Kilowatts and other Units P hp_el = input power to the electrical motor The input horsepower to the electrical motor for a pump or fan can be expressed as: P bhp = η ( γ Q h / 33000 ) (2b) Input Horsepower to the Electrical Motor The brake horse power - bhp - for a turbine can be expressed as: ![]() Η = overall efficiency Shaft or Brake Horsepower for a Turbine P bhp = brake horse power (horsepower, hp) The brake horse power - bhp - for a pump or fan can be expressed as: Shaft or Brake Horsepower for a Pump or Fan In the metric system kilowatts (kW) is used.ĭue to hydraulic, mechanical and volumetric losses in a pump or turbine the actual horsepower available for work on or from the fluid is less than the total horsepower supplied. The brake horsepower is the amount of real horsepower going to the pump, not the horsepower used by the motor. (10 ft 3/min) (1 hp) / (1 ft 3/min) = 10 hp Shaft or Brake Horsepower Required power to pump 10 ft 3/min can be calculated as Required horsepower (hp) to pump 1 cubic foot of water per minute (ft 3/min) with efficiency 85% - is indicated in the diagram below:Įxample - Required Power to lift 10 ft 3/min of Water 600 ftĪccording the diagram above 1 hp is required to lift 1 ft 3/min of water 600 ft. Specific Gravity for some common Fluids and Liquids.SG for water is 1.001 at 32 oF and 0.948 at 240 oF. Water horsepower for flow in gal/min can be expressed as: Γ= specific weight (lb f/ft 3) (weight is force) Water Horsepower for Flow in gal/min M sec = mass flow rate per second (lb m/s) ![]() M min = mass flow rate per minute (lb m/min)Ī g = acceleration of gravity (32 ft/s 2) The total horsepower developed by water falling from a given height is the product of the mass flow rate in pounds per minute times the falling height in feet divided by 33000 and can be expressed as: In the SI system the unit of power is watt (W, Nm/s, J/s). In gravity systems the Force is Weight - mass multiplied with gravity. Note that Power is "Work per unit time" and work is "Force through distance". A horsepower is the ability to do work at the rate of Horsepower is the imperial (British) unit of power.
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