# Ventilation

Calculate Fresh Air exchanges flow in Room according the air change rate per hour.

Calculate Fresh Air exchanges flow in Room according the air change rate per hour.

Sizing the DOL and Star-Delta starter parts:

Circuit breaker, Over load relay, Main contactor, Delta contactor. Star Contactor, Contactor of type for each application according to IEC standards.

Water pump sizing calculator

How to size a Circuit Breaker in household

Electrical Motor Power to Torque Equations

In the electrical system, capacitor is used for the purpose of compensating reactive power to improve the power factor cosφ (cos phi) to ensure the operation efficiency of the grid. Therefore, compensating capacitors will reduce a significant amount of electricity monthly (a few dozen% reduction depending on the unit).

Calculate the necessary Torque, Speed, Stopping Accuracy and System Inertia that base selecting a proper motor for the rotary table aplication.

Calculate the necessary Torque, Speed, Stopping Accuracy and System Inertia that base selecting a proper motor for the arm aplication.

Calculate the necessary Torque, Speed, Stopping Accuracy and System Inertia that base selecting a proper motor for the ball/lead screw aplication.

Calculate the voltage drop rate according to conductor size area.

Maximum allowable voltage-drop vary from one country to another.

Conductor sizing:

– Selection of conductor type and insualtion.

– Selection of method of installation.

– Taking account of correction factors for different environment conditions.

– Determination of cross-sectional areas using tables giving the current carrying capacity.

Temperature: [°C] Flow rate: [m3/hr] Duct Size: Select Pipe Type: Circle PipeRectangular Pipe Internal Diameter: [mm] Width: [mm] Roughness height: [mm] Pipe Lenght: [m] Equivalent diameter: [mm] Flow Area: [m2] Flow Viscosity: [Kg/m.s] Flow Velocity: [m/s] Flow Density: [Kg/m3] Reynolds Number: Friction Factor: Velocity Pressure: Pa Pressure drop: Pa/m Total pressure drop on Pipe: Pa

Swamee–Jain equation

The Swamee–Jain equation is used to solve directly for the Darcy–Weisbach friction factor f for a full-flowing circular pipe. It is an approximation of the implicit Colebrook–White equation.

The Reynolds number is defined as: Where: – ρ is the density of the Air/Fluid (SI units: kg/m3).– u is the velocity of the Air/Fluid with respect to the object (m/s).– L is a characteristic linear dimension (m).– μ is the dynamic viscosity of the Air/Fluid (Pa·s or N·s/m2 or kg/m·s).– ν is the kinematic… Read More »

Pipe Line Velocity Calculator

The density, the volumetric mass density, of a substance is its mass per unit volume of the Earth’s atmosphere.

Water and Gases viscosity calculator

Calculate dynamic pressure and pressure drop in pipe.

To calculate the size, simply multiply the length with the width of the room or area to be cooled. Then, as a practical number that total multiplied by 600 BTU.

Full load current calculation:

In a Single phase motor:

I (current)= Power / (Voltage × Power Factor × Efficiency).

In a three phase motor.

I (current)= Power / (√3 × Voltage × Power Factor × Efficiency).