OR-20-017 -- A Simple Airflow and Power Model of Fan Coil Units with Permanent Split Capacitor Motors PDF

Four manufacturers provided laboratory airflow andpower data as a function of external static pressure for over 35multi-speed fan-coil units with permanent split capacitormotors. These data were used to develop simplified performancemodels of fan-coil units that could be used in building simulationprograms to estimate the annual energy performance of fan-coilunits. The fan-coil units had fan motors ranging in size from0.033 to 0.75 hp (25 to 560 W) and maximum airflows thatranged from 242 to 2646 ft3/min (0.11 to 1.25 m3/s). The basicmodel consisted of a simple set of regressions relating fan motorpower to the fan airflow. Modeling the whole range of airflowsrequired a second degree polynomial. The units were then disaggregatedinto smaller units with fan motors less than 0.25 hp(187 W) and larger units with fan motors 0.25 hp (187 W) andgreater. The smaller units had values of fan efficacy that averaged0.269 W/ft3/min (570 W/m3/s) while the large units averaged0.486 W/ft3/min (1030 W/m3/s). A procedure was alsodeveloped to estimate the airflows and powers at part load operationsfor multi-speed permanent split capacitor fan-coil units.

File Size :	1 file , 1.4 MB
Note :	This product is unavailable in Russia, Belarus
Number of Pages :	11
Product Code(s) :	D-OR-20-017
Published :	2020
Units of Measure :	Dual