Here are some common methods for calculating CFM: Direct Measurement: It is the most accurate method and involves using specialized equipment like an anemometer to directly measure the airflow at a specific point within the duct or system. Measurements are in feet per minute, yielding the Specific...
Measure the outdoor air temperature entering the condenser from top to bottom of the coil outside of line of site of the sun and obtain an average condenser entering air temperature. Measure the liquid line temperature with an accurate clamp probe thermometer. Determine the temperature difference ...