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Four manufacturers provided laboratory airflow andpower data as a function of external static pressure for over 35 multi-speed fan-coil units with permanent split capacitor motors. These data were used to develop simplified performance models of fan-coil units that could be used in building simulation programs to estimate the annual energy performance of fan-coil units. The fan-coil units had fan motors ranging in size from 0.033 to 0.75 hp (25 to 560 W) and maximum airflows that ranged from 242 to 2646 ft3/min (0.11 to 1.25 m3/s). The basic model consisted of a simple set of regressions relating fan motorpower to the fan airflow. Modeling the whole range of airflows required a second degree polynomial. The units were then disaggregated into smaller units with fan motors less than 0.25 hp(187 W) and larger units with fan motors 0.25 hp (187 W) and greater. The smaller units had values of fan efficacy that averaged 0.269 W/ft3/min (570 W/m3/s) while the large units averaged 0.486 W/ft3/min (1030 W/m3/s). A procedure was also developed to estimate the airflows and powers at part load operations for multi-speed permanent split capacitor fan-coil units.
Citation: 2020 Winter Conference, Orlando, FL Technical Papers
Product Details
- Published:
- 2020
- Number of Pages:
- 11
- Units of Measure:
- Dual
- File Size:
- 1 file , 1.4 MB
- Product Code(s):
- D-OR-20-017
