Air Speed Measurement Overview

This document presents air speed measurements taken at a height of 1.1 meters (H1) or 3.5 feet, with a fan operating at 850 rpm. The measurements are provided in both metric (m/s) and imperial (ft/min) units.

Measurement Setup

• Fan Speed: 850 rpm
• Measurement Heights: H = 3.35 m (11 ft), H1 = 1.10 m (3.5 ft)
• Measurement Angles: 22.5°
• Measurement Views: Top view and side view
• Measurement Distances: From 7.6 m to 24.0 m (25 ft to 80 ft) along the airflow direction
• Equipment: Short cone used for air speed measurement

Air Speed Data

The air speed values vary along the measurement distances and heights. Key observations include:

• Air speed at H1 (1.1 m) ranges approximately from 0.4 m/s to 2.8 m/s.
• Corresponding air speed in ft/min at H1 (3.5 ft) ranges from 79 ft/min to 1043 ft/min.
• Higher air speeds are observed closer to the fan and decrease with distance.
• Data is presented in tabular form with values corresponding to specific distances and positions (left, right, center).

Spatial Layout

The measurements are taken at multiple points along the airflow path, with lateral positions indicated as L (left), R (right), and center (0). Heights H and H1 correspond to vertical measurement points.

Key Parameters and Conditions

• Fan speed fixed at 850 rpm ensures consistent airflow generation.
• Measurement angle of 22.5° likely relates to the orientation of the measurement cone or sensor.
• Distances from the fan range from 7.6 m (25 ft) to 24.0 m (80 ft), covering a broad area of airflow dispersion.

Summary

This document provides detailed air speed profiles for a fan operating at 850 rpm, measured at two heights and multiple distances. The data supports analysis of airflow distribution and velocity decay over distance, useful for ventilation design, environmental control, or similar applications.