recirculation

Recirculation refers to the process of reusing or redirecting a substance, such as air, water, or heat, within a system instead of allowing it to escape or be discarded. For example, in HVAC systems, recirculating air involves pulling some of the indoor air back into the system to be filtered, conditioned, and redistributed, improving energy efficiency and maintaining indoor air quality. Similarly, water recirculation in cooling systems reuses water to reduce waste and conserve resources. Overall, recirculation enhances efficiency and sustainability by keeping resources within the system rather than losing them.