Hvac Duct Area Calculation Formula

The area of a rectangular duct.

Hvac duct area calculation formula.

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. 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. Then we find the area ratio using the formula diameter out squared divided by diameter in squared. 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.

Beauty and health engineering finance life mathematics science. It s a simple enough process as long as you remember the formula. The following equations are used to calculate the wetbulb temperature of air given the drybulb temperature and relative humidity. 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.

Converting an area to square feet would seem simple unless the area is spread over a form with height width and depth. 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. Simple calculator for calculating the area of a rectangular duct online.