{"id":3391,"date":"2026-09-15T02:50:36","date_gmt":"2026-09-14T18:50:36","guid":{"rendered":"http:\/\/www.neshananews.com\/blog\/?p=3391"},"modified":"2026-09-15T02:50:36","modified_gmt":"2026-09-14T18:50:36","slug":"how-to-calculate-the-total-pressure-of-a-centrifugal-blower-48c5-c935d2","status":"publish","type":"post","link":"http:\/\/www.neshananews.com\/blog\/2026\/09\/15\/how-to-calculate-the-total-pressure-of-a-centrifugal-blower-48c5-c935d2\/","title":{"rendered":"How to calculate the total pressure of a centrifugal blower?"},"content":{"rendered":"

As a supplier of centrifugal blowers, I often encounter customers who are curious about how to calculate the total pressure of a centrifugal blower. Understanding this calculation is crucial for selecting the right blower for specific applications, ensuring optimal performance, and energy efficiency. In this blog post, I’ll walk you through the process of calculating the total pressure of a centrifugal blower, breaking down the key concepts and equations involved. Centrifugal Blower<\/a><\/p>\n

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Understanding the Basics of Centrifugal Blower Pressure<\/h3>\n

Before we dive into the calculation, it’s essential to understand the different types of pressure associated with centrifugal blowers. There are three main pressure components: static pressure, velocity pressure, and total pressure.<\/p>\n

Static Pressure (Ps)<\/h4>\n

Static pressure is the pressure exerted by the air or gas within the system. It is the pressure that pushes against the walls of the ductwork, filters, and other components in the system. Static pressure is measured in units such as inches of water column (in. WC) or pascals (Pa). In a centrifugal blower system, static pressure is responsible for overcoming the resistance of the ductwork, filters, and other components to move the air or gas through the system.<\/p>\n

Velocity Pressure (Pv)<\/h4>\n

Velocity pressure is the pressure associated with the movement of the air or gas. It is the pressure required to accelerate the air or gas from rest to a certain velocity. Velocity pressure is also measured in units such as inches of water column (in. WC) or pascals (Pa). The velocity pressure is directly related to the speed of the air or gas flowing through the system. Higher velocities result in higher velocity pressures.<\/p>\n

Total Pressure (Pt)<\/h4>\n

Total pressure is the sum of the static pressure and the velocity pressure. It represents the total energy per unit volume of the air or gas in the system. Total pressure is the pressure that the blower needs to generate to move the air or gas through the system and overcome all the resistances. Mathematically, it can be expressed as:<\/p>\n

[ Pt = Ps+Pv ]<\/p>\n

Calculating Static Pressure<\/h3>\n

The static pressure in a centrifugal blower system can be calculated by considering the various resistance elements in the system. These resistance elements include ductwork friction, fittings (such as elbows and tees), filters, dampers, and other components.<\/p>\n

Ductwork Friction<\/h4>\n

The static pressure loss due to ductwork friction can be calculated using the Darcy – Weisbach equation for laminar or turbulent flow. However, for most practical applications in centrifugal blower systems, simplified methods are often used. One common method is to use the friction loss charts provided by manufacturers or industry standards. These charts give the friction loss per unit length of ductwork (in inches of water column per 100 feet or pascals per meter) based on the duct size, air velocity, and duct material.<\/p>\n

The formula for calculating the total static pressure loss due to ductwork friction ((Ps_{duct})) is:<\/p>\n

[ Ps_{duct}=f\\times L\\times\\frac{v^{2}\\rho}{2} ]<\/p>\n

where (f) is the friction factor, (L) is the length of the ductwork, (v) is the air velocity, and (\\rho) is the density of the air or gas.<\/p>\n

Fittings and Components<\/h4>\n

The static pressure loss across fittings and other components can be determined by using the equivalent length method or the loss coefficient method.<\/p>\n

The equivalent length method involves converting the pressure loss across a fitting into an equivalent length of straight ductwork. The total static pressure loss due to fittings ((Ps_{fittings})) is then calculated using the same method as for ductwork friction, but using the equivalent length ((L_{eq})) of the fittings.<\/p>\n

[ Ps_{fittings}=f\\times L_{eq}\\times\\frac{v^{2}\\rho}{2} ]<\/p>\n

The loss coefficient method uses a loss coefficient ((K)) for each fitting. The static pressure loss across a fitting is calculated as:<\/p>\n

[ Ps_{fittings}=K\\times\\frac{v^{2}\\rho}{2} ]<\/p>\n

The total static pressure in the system ((Ps)) is the sum of the static pressure losses due to ductwork friction, fittings, filters, and other components.<\/p>\n

[ Ps = Ps_{duct}+Ps_{fittings}+Ps_{filters}+\\cdots ]<\/p>\n

Calculating Velocity Pressure<\/h3>\n

The velocity pressure ((Pv)) can be calculated using the following formula:<\/p>\n

[ Pv=\\frac{v^{2}\\rho}{2} ]<\/p>\n

where (v) is the velocity of the air or gas in the ductwork, and (\\rho) is the density of the air or gas.<\/p>\n

The density of the air or gas can be calculated using the ideal gas law:<\/p>\n

[ \\rho=\\frac{P}{RT} ]<\/p>\n

where (P) is the pressure of the air or gas, (R) is the specific gas constant, and (T) is the absolute temperature.<\/p>\n

Example Calculation<\/h3>\n

Let’s consider an example to illustrate the calculation of the total pressure of a centrifugal blower. Suppose we have a system with the following parameters:<\/p>\n