How is the static pressure at the fan outlet defined?
Thread Content
Upon receiving the fan’s operating parameters from the manufacturer, I identified an issue: when calculating the static pressure at the outlet, the manufacturer used the static pressure at the inlet as a reference point, rather than atmospheric pressure. This calculation method is fine if the fan’s inlet is connected to the atmosphere; however, it becomes unreasonable when there is a certain pressure in front of the fan. I hope everyone will share their opinions.
Consider how to formulate the Bernoulli equation; if the outside atmosphere is taken as a boundary, then the dynamic pressure at the fan outlet also needs to be taken into account. If the inlet is chosen as the interface, the exit dynamic pressure can be ignored, as the inlet and outlet are similar.