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Energy efficiency, particularly HVAC energy use in buildings, offers a large potential of reducing overall energy consumption. By optimizing fan controls in variable air volume (VAV) HVAC systems, up to 30 to 50% of fan energy can be saved using trim and respond (TR) strategies compared to constant pressure strategies. The tiered trim and respond (TTR) strategy has shown promise in realizing significant fan energy savings in real buildings without issues of static pressure oscillation. This study proposed the demonstration of the TTR strategy at five Iowa Army National Guard facilities comparing against fixed static pressure (FSP) and traditional TR strategies over a ten-month period. The DDC and HVAC systems at each site were equipped with the necessary hardware and software needed to properly test and record all data needed. Functional mode and power verification testing were conducted to confirm the correct implementation of the TTR method and fan power readings from the DDC system and installed data logging systems. After a ten-month period, the fan energy savings results for the TTR and FSP comparison were as follows: Boone RC AHU-1 20.86% and AHU-2 10.69%, Des Moines MEPS AHU-1 27.30%, JFHQ AHU-1 4.73%, AHU-4 12.83%, AHU-9 59.92% and AHU-12 15.83%, Muscatine AFRC RTU-1 18.91%, RTU-3 29.46%, RTU-4 36.54% and Waterloo RC RTU-1 33.80%. The fan energy savings results of the TTR and TR comparisons are as follows: JFHQ AHU-2 -25.90% and AHU-3 -47.27%. The temperature control comparisons results on the TTR and TR comparison air handling units (AHUs) are as follows: JFHQ AHU-2 4.35% and AHU-3 7.76%.

An investigative analysis of an advanced trim and respond control strategy for variable air volume HVAC systems