TO: Wells Fargo Innovation Incubator (IN2) Board of Directors
FROM: National Renewable Energy Laboratory (NREL)
DATE: April 2023
IN2 Company Name: Turntide Technologies (demonstration project)
It is possible that Wells Fargo is not using enough supply airflow for cooling. The manufacturer suggests 2,000 cfm for the five ton RTU at the Englewood site.
Based on the power consumption witnessed during this field evaluation of 374W (0.5 hp), the output power could be roughly 224-254W or 0.3-0.4 hp. The highlighted values in Figure 2 show that the majority of the possible airflows at this output power are lower than 2,000 cfm. Low airflow can reduce capacity in cooling or heating, can trip the low-pressure alarm during cooling, and can cause extreme supply air temperatures. Significantly low airflow can freeze the evaporator coil during cooling or cause high temperature trips during heating.