Comparison Of Actual Supply Air Fan Performance Data To ASHRAE 90.1 Standard -2010 And Doe Commercial Reference Buildings Part Load Fan Energy Use Formula PDF

Energy use associated with fans in HVAC systems account for a significant portion of total building energy use. Over or underestimation of fan energy use would significantly impact the accuracy of a forward building energy simulation model of the operation of a new building or the successful identification and prioritization of related Energy Efficiency Measures (EEMs) in an existing building. Simulation software, such as EnergyPlus use the fan part load energy use formulae suggested by ASHRAE 90.1 Standards and the DOE Commercial Reference Buildings. This paper investigates the reliability of this formula in predicting fan energy use by comparing the "standard," part load equation predictions with field measured data. This case study has been done on two instrumented office buildings located in Philadelphia, PA metro area. Sensors, with one-minute and 15-minute time acquisition intervals, monitoring fan power use collected data for over a year is utilized in this study.