What does the term "stratification" refer to in heating and cooling?

Stratification refers to the phenomenon where different layers of air in a space exhibit varying temperatures, leading to a non-uniform distribution of heat or coolness. In heating and cooling systems, stratification can result in warmer air rising towards the ceiling while cooler air settles closer to the floor. This layering effect can have a significant impact on comfort levels within a space and can influence the efficiency of a heating or cooling system. Understanding stratification is essential for properly designing HVAC systems to ensure even temperature distribution, which can enhance energy efficiency and occupant comfort.

The concept of uniform air distribution does not apply here, as stratification implies there is a lack of uniformity. Likewise, while air movement due to pressure differences is an important aspect of HVAC systems, it does not specifically define stratification. The influence of duct size on airflow is relevant to system performance but does not directly relate to the temperature layering described by stratification.