Hvac Duct Area Calculation Formula

Then you have to convert the outside of that form its perimeter and length into a workable flat surface and convert the area of that flat surface to square feet.

Hvac duct area calculation formula.

Download hvac duct measurement excel sheet xls 11 02 2018 04 09 00 pm this excel sheet is for hvac duct measurement like duct weight duct area and all calculation related to ductwork like hanger supports and duct insulation. Then we find the area ratio using the formula diameter out squared divided by diameter in squared. We take our values from our table and use 3 5m s divided by 4m s to get 0 875 for the velocity ratio and we use 0 26m squared divided by 0 33m squared to get 0 62 for the area ratio. Standard autocad drawings shows the width and height of duct at various regions where as length should be taken out using a hand scale by measuring the duct at each positions.

Simple calculator for calculating the area of a rectangular duct online. Online calculator to calculate the area of a rectangular duct. The following equations are used to calculate the wetbulb temperature of air given the drybulb temperature and relative humidity. Then to get area in meter square use the equation.

Beauty and health engineering finance life mathematics science. The equation assumes that the ambient barometric pressure is constant at a value of 29 15 hg since the change in wetbulb temperature is very insignificant with changes in the ambient barometric pressure. To calculate the rectangular duct area we need height width and length.