During the velocity profile tests conducted prior to the UV-C lamp installations, Kneiss discovered varying levels of velocity, indicating some parts of the coil were much dirtier than others. “It was easy to see certain sections had higher velocities than other sections, indicating a build-up of debris in the lower velocity areas,” he says. “The velocity readings in our baseline measurements were not stable either.”
When Kneiss returned after the installation of the UV lighting system, he used the same test instruments, locations and procedures and found the air velocity readings were higher and much more stable across the entire coil surface.
“Our opinion after reviewing the results and differences was that the cooling coil performance was significantly improved from our first set of readings,” Kneiss recalls. “Coil velocities were more even throughout the coil and there was an improvement of the offcoil dew point, as well. For south Florida, that is a major benefit.”
Building engineers also recorded increased efficiency of individual HVAC components and a drop in electric consumption overall, following the UV-C installation. When airflow levels increased, the resulting performance boost allowed every component in the building’s HVAC system (chillers, cooling towers, air handlers, motors, pumps, etc.) to be turned down—without sacrificing tenant comfort—reducing electrical consumption and decreasing equipment wear and tear. Those involved estimate the project energy savings provided a remarkable three-month payback.
As for Willis, she was so pleased with the results that she plans future use of UV-C technology. “Within one month, we saw an immediate reduction in our energy costs, which has remained consistent since the installation,” she explains. “I believe so strongly in this improvement that we are getting ready to do it at one of our other properties in Doral, Fla. We are very satisfied with the decision to install the UV lighting.”
Fixtureless uV-C lamp system: RLM Xtreme from UV Resources
• The UV germicidal wavelength provides cleaner, healthier air by preventing microbial buildup in HVAC-R cooling coils, drain pans, air filter and duct surfaces. UV-C energy also kills pathogens in airstreams. UV-C’s proper application results in improved coil heat transfer, reduced energy use, less odor, and reduced cleaning downtime and damage. These effects can also lower the incidence of airborne allergens and colds and flu, which could result in lower rates of absenteeism.