What is the function of a runaround loop in HVAC?

The function of a runaround loop in HVAC systems is primarily to circulate water between heat exchangers. This loop typically connects two heat exchangers, allowing for the transfer of heat from one medium to another without mixing the two fluids directly. This setup is particularly useful for energy recovery applications, where the heated water can be used to preheat incoming water, thus optimizing energy efficiency.

In practice, the runaround loop can effectively facilitate the transfer of thermal energy for heating or cooling processes, contributing to overall energy conservation within the HVAC system. It leverages the heat exchange process to balance temperatures and enhance efficiency, making it a valuable component in various HVAC configurations.

Other choices relate to different functions that are not typically associated with runaround loops. For example, distributing conditioned air is usually handled by ductwork, cooling water for a chiller pertains to chiller operation without direct heat exchange, and enhancing humidity control typically involves other equipment like dehumidifiers or humidifiers rather than a loop system.