Why is airflow important?
When considering a new test chamber, you may be concerned about airflow speed? How fast should it be? Most test specifications don’t say much on this subject, which makes it even harder to decide. In some cases low speed is acceptable and/or desirable, and others high speed is better. Test chambers need to circulate the air so that it can pass over heaters and coolers, ensuring a uniform air temperature. This is called “forced convection”. You may think that “natural convection” is better to simulate real-world conditions, but it doesn’t make a difference in most cases. Low speed: If your test application doesn’t specify temperature change rate, or if it is relatively slow (less than 5 degrees per minute), then lower air speed is okay. Instead, concentrate on how the air is distributed to ensure it uniform. High speed: If your primary concern is changing the temperature of your test samples quickly, then you should be more interested in airflow. The faster the airflow, the quicker heat
