# BLDG 371 lab 4.docx - Objective The objective of this...

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Objective: The objective of this experiment is to measure and plot the distribution of airflow in a 12in by 12in square duct section and to find the relationship between the fan speed and flowrate. Introduction: Knowing how air flows through a duct allows engineers to better design HVAC systems and more efficiently circulate fresh air throughout a building. In this experiment we will be measuring the air velocity in a square (12in by 12in) duct. The velocity will be measured at nine separate point (see figure 1) using the TSI Velocicalc for fan speeds of 1500RPM, 1300RPM, 1100RPM, 900RPM, and 700RPM. Figure 1 – Velocity point location The velocity only needs to be measured in one quadrant. We will assume that the velocity in roughly the same for the other three quadrant. With these values of velocity we will calculate the flow rates at each fan speed of the entire duct outlet using the following formula: Q = V avg A Where, Q is the flowrate [m 3 /s] V avg is the average velocity V 1 + V 2 + + V 9 9 [m/s]
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