What is the primary function of the run around system?

The primary function of the run around system is to absorb heat from exhaust air and transfer it to inlet air. This process enables energy recovery and increases the overall efficiency of HVAC systems. In a run around system, a liquid coolant circulates through a closed loop, absorbing heat from the outgoing air that has already been cooled or conditioned and using that energy to warm the incoming fresh air. As a result, this system effectively recycles heat and can reduce the demand for heating energy, thus improving energy efficiency in climate control operations.

In the context of HVAC systems, while options related to moisture removal, air particle filtering, and air distribution are essential functions of certain systems—such as dehumidifiers, air filters, and air handlers—they do not encapsulate the specific thermal energy recovery role performed by a run around system. Each of these functions serves a different purpose within the larger framework of maintaining air quality and comfort, but they do not relate directly to the heat exchange functionality characteristic of run around systems.