Method and coanda-effect apparatus for enhanced upper-air uv-c air sanitation

A system for enhancing ultraviolet air disinfection in an enclosed space, wherein the enclosed spaced is coupled to an HVAC supply configured to deliver conditioned air into the enclosed space, and wherein the enclosed space is defined by an upper region proximate a ceiling, a lower region proximate a floor, and a occupation region intermediate the upper region and the lower region of the enclosed space, the system comprising:

• a) at least one Coandă-effect diffuser configured to be coupled to the HVAC supply and mounted adjacent the ceiling of the enclosed space, the diffuser configured to redirect supplied air received from the HVAC supply along the ceiling to induce a room-scale rotational airflow pattern;
• and
• b) at least one upper-air ultraviolet luminaire positioned within the upper region of the enclosed space and configured to generate an ultraviolet irradiation region;
• wherein the diffuser is configured to establish a circulating airflow that entrains contaminated air from the lower region and transports the contaminated air into the ultraviolet irradiation region produced by the upper-air ultraviolet luminaire;
• and
• wherein the circulating airflow delivers treated air from the ultraviolet irradiation region toward the occupation region of the enclosed space.