﻿ fan horsepower equation
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### fan horsepower equation

This energy is described in terms of pressure. The faster the air moves through the system the greater the resistance imposed to flow and the more energy required to deliver the air through the system. In general, using these rules or fan laws, once we know the performance of a given fan under set specified operating conditions, variations in the performance can be predicted with reasonable levels of accuracy. 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 a fixed system, it is said that the pressure required/system resistance varies with the square of the volume of air flowing through the system. 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 Also, it’s worth noting that changing fan accessories such as inlet dampers, inlet boxes will change the fan performance curve from the standard. A higher level of accuracy would require the effects of say, the viscosity of the gas, surface roughness of the fan, scale effect also be considered. The first thing to note about the fan curve 1 CuFt per Sec. Efficiency of Pump = %/100. Design and analyse incompressible, compressible, two-phase, non-Newtonian, settling slurry and pulp and paper stock pipe flow systems. The fan laws help us estimate how a fan will operate in a system at different speeds, fluid density, impeller diameter, etc. Also included is information on motor efficiency and horsepower calculations as well as several motor calculations for energy efficiency and electrical troubleshooting. The fanâs performance is converted to standard conditions as fol-lows: 1. FluidFlow software considers the effects of compressibility, suction pressure variation, etc whilst also solving the fan laws ensuring a high level of accuracy. Furthermore, suction pressure variations, density changes, composition changes, etc are common and can also affect how the fan will operate in the system. 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 âin. PBHP = q dpinWG / Î¼ 6356 (2) where. The following is a generic equation to determine the required horsepower to drive the fan or blower element . Static Pressure (SP): Static pressure is the pressure caused solely by compression, the outward force on a duct. wg.â. Fans or blowers are often installed in the ventilation or industrial process systems to overcome the resistance. On the other hand, we can reduce the fan speed from say N1 to N2 to reduce the airflow in the system and keep the damper in the fully open position.